View Filing Data

Cash and cash equivalents

$ 520,048

$ 298,394

^[1]

Short-term investments

882,976

265,374

Accounts receivable, net of allowances of $1,166 and $2,098

130,115

91,926

Deferred commissions

33,636

24,185

32,950

28,237

Property and equipment, net

1,599,725

708,116

53,535

52,921

Deferred commissions, noncurrent

125,204

121,389

77,874

54,812

Intangible assets, net

32,529

13,897

48,023

18,089

Other assets

18,505

15,089

Accrued expenses and other current liabilities

1,955,395

984,313

Current liabilities:

Accounts payable

3,837

2,431

36,887

33,653

Accrued compensation

40,300

19,770

2023 convertible senior notes, net

100,703

271,628

Deferred revenue

365,236

245,622

2025 convertible senior notes, net

546,963

573,104

837,002

Deferred revenue, noncurrent

154,511

147,046

6,214

8,768

Other liabilities, noncurrent

5,361

3,018

Commitments and contingencies (Note 11)

1,550,051

731,936

Stockholders’ equity:

Preferred stock, par value $0.0001 per share; 100,000 shares authorized, no shares issued and outstanding as of January 31, 2020 and 2019

Additional paid-in capital

1,105,564

744,896

Accumulated other comprehensive income (loss)

892

(319)

Accumulated deficit

(701,124)

(492,211)

Total stockholders’ equity

405,344

252,377

General and administrative

1,955,395

984,313

Class A Common Stock

Stockholders’ equity:

Common stock

Class B Common Stock

Stockholders’ equity:

Common stock

$ 1

[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Statement of Financial Position [Abstract]
Allowance for accounts receivable	$ 1,166	$ 2,098
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	113,990,000	101,093,000
Common stock, shares outstanding (in shares)		101,093,000
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	8,648,000	11,059,000
Common stock, shares outstanding (in shares)		11,059,000

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

Revenue

Total revenue

$ 586,067

$ 399,254

$ 256,547

Cost of revenue

Total cost of revenue

159,382

113,421

80,755

Gross profit

426,685

285,833

175,792

Operating expenses

Research and development

159,269

102,385

70,821

Sales and marketing

340,356

227,960

165,020

112,892

75,110

51,803

Total operating expenses

612,517

405,455

287,644

Operating loss

(185,832)

(119,622)

(111,852)

Interest expense

(27,017)

(15,072)

Interest income and other, net

17,089

9,180

1,682

Loss on early extinguishment of debt

(14,572)

^[1]

Interest expense and other, net

(24,500)

(5,892)

1,682

Loss before benefit from income taxes

(210,332)

(125,514)

(110,170)

Benefit from income taxes

(1,419)

(17)

(321)

Net loss per share, basic and diluted (in dollars per share)

$ (208,913)

$ (125,497)

^[1]

$ (109,849)

^[1]

$ (1.78)

$ (1.17)

$ (1.32)

Weighted-average shares used to compute net loss per share, basic and diluted (in shares)

117,221

107,504

83,004

Subscription

Revenue

Total revenue

$ 552,688

$ 370,855

$ 236,422

Cost of revenue

Total cost of revenue

116,445

77,354

52,481

Professional services and other

Revenue

Total revenue

33,379

28,399

20,125

Cost of revenue

Total cost of revenue

$ 42,937

$ 36,067

$ 28,274

[1]	Adjusted for adoption of ASC 842. See Note 2.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

Statement of Comprehensive Income [Abstract]

Net change in unrealized gains or losses on available-for-sale securities

$ (208,913)

$ (125,497)

^[1]

$ (109,849)

^[1]

1,220

179

(202)

Foreign currency translation adjustments

(9)

(889)

760

Other comprehensive income (loss)

1,211

(710)

558

Comprehensive loss

$ (207,702)

$ (126,207)

$ (109,291)

[1]	Adjusted for adoption of ASC 842. See Note 2.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Beginning balance (in shares) at Jan. 31, 2017

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)

Total

Series B Redeemable Convertible Preferred Stock

Redeemable Convertible Preferred Stock

Common Stock

Class A Common Stock

Common Stock

Class B Common Stock

Additional Paid-in Capital

Accumulated Other Comprehensive Income (Loss)

Accumulated Deficit

59,465,439

Beginning balance at Jan. 31, 2017

$ 227,954,000

Increase (Decrease) in Temporary Equity [Roll Forward]

Issuance of Series B redeemable convertible preferred stock upon net exercise of warrants (in shares)

26,201

Issuance of Series B redeemable convertible preferred stock upon net exercise of warrants

$ 408,000

Conversion of convertible preferred stock to common stock in connection with initial public offering (in shares)

(59,491,640)

59,491,640

Conversion of convertible preferred stock to common stock in connection with initial public offering

$ 228,362,000

$ (228,362,000)

$ 6,000

$ 228,356,000

Ending balance (in shares) at Jan. 31, 2018

Ending balance at Jan. 31, 2018

$ 0

Beginning balance (in shares) at Jan. 31, 2017

20,293,338

Beginning balance at Jan. 31, 2017

(212,361,000)

$ 0

$ 2,000

44,469,000

$ (167,000)

$ (256,665,000)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Issuance of common stock upon exercise of stock options and other activity, net (in shares)

8,274,599

900,517

Issuance of common stock upon exercise of stock options and other activity, net

34,698,000

$ 1,000

34,697,000

Issuance of common stock upon net exercise of warrant (in shares)

168,750

Issuance of common stock in connection with initial public offering, net of underwriting discounts and issuance costs (in shares)

12,650,000

Issuance of common stock in connection with initial public offering, net of underwriting discounts and issuance costs

194,345,000

$ 1,000

194,344,000

Conversion of convertible preferred stock to common stock in connection with initial public offering (in shares)

(59,491,640)

59,491,640

Conversion of convertible preferred stock to common stock in connection with initial public offering

228,362,000

$ (228,362,000)

$ 6,000

228,356,000

Issuance of common stock and restricted stock in connection with acquisition (in shares)

1,598,500

Issuance of common stock and restricted stock in connection with acquisition

3,652,000

Issuance of common stock pursuant to charitable donation (in shares)

24,287

Issuance of common stock pursuant to charitable donation

708,000

^[1]

708,000

Issuance of common stock under employee stock purchase plan (in shares)

569,373

Issuance of common stock under employee stock purchase plan

8,369,000

Conversion of Class B common stock to Class A common stock (in shares)

49,091,639

(49,091,639)

Conversion of Class B common stock to Class A common stock

$ 5,000

$ (5,000)

Other comprehensive income

50,858,000

558,000

Ending balance (in shares) at Jan. 31, 2018

(109,849,000)

^[1]

$ (31,980,000)

$ (77,869,000)

(109,849,000)

70,609,898

33,361,106

Ending balance at Jan. 31, 2018

$ 199,340,000

$ 7,000

$ 3,000

565,653,000

391,000

(366,714,000)

Ending balance (in shares) at Jan. 31, 2019

Ending balance at Jan. 31, 2019

$ 0

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Issuance of common stock upon exercise of stock options and other activity, net (in shares)

6,465,957

104,084

Issuance of common stock upon exercise of stock options and other activity, net

37,611,000

$ 1,000

37,610,000

Issuance of common stock pursuant to charitable donation (in shares)

20,000

Issuance of common stock pursuant to charitable donation

1,008,000

^[1]

1,008,000

Issuance of common stock under employee stock purchase plan (in shares)

615,210

Issuance of common stock under employee stock purchase plan

13,727,000

Issuance of common stock for settlement of RSUs (in shares)

976,248

Conversion of Class B common stock to Class A common stock (in shares)

22,406,009

(22,406,009)

Conversion of Class B common stock to Class A common stock

$ 2,000

$ (2,000)

Equity component of convertible senior notes, net of issuance costs

77,631,000

Issuance of warrants related to 2023 convertible senior notes

52,440,000

Purchases of hedges related to 2023 convertible senior notes

(80,040,000)

Other comprehensive income

76,867,000

(710,000)

Ending balance (in shares) at Jan. 31, 2019

(125,497,000)

^[1]

$ (107,926,000)

$ (17,571,000)

(125,497,000)

101,093,322

11,059,181

Ending balance at Jan. 31, 2019

$ 252,377,000

^[2]

$ 10,000

$ 1,000

744,896,000

(319,000)

(492,211,000)

Ending balance (in shares) at Jan. 31, 2020

Ending balance at Jan. 31, 2020

$ 0

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Issuance of common stock upon exercise of stock options and other activity, net (in shares)

5,422,281

5,323,410

100,007

Issuance of common stock upon exercise of stock options and other activity, net

$ 45,732,000

$ 1,000

45,731,000

Issuance of common stock pursuant to charitable donation (in shares)

15,000

Issuance of common stock pursuant to charitable donation

1,746,000

Issuance of common stock under employee stock purchase plan (in shares)

322,795

Issuance of common stock under employee stock purchase plan

$ 18,767,000

Issuance of common stock for settlement of RSUs (in shares)

1,716,222

Issuance of common stock for settlement of bonus (in shares)

34,600

2,809,000

Issuance of stock for settlement of bonus

$ 2,809,000

Conversion of Class B common stock to Class A common stock (in shares)

2,511,409

(2,511,409)

Conversion of Class B common stock to Class A common stock

$ 0

Equity component of convertible senior notes, net of issuance costs

217,347,000

$ 217,347,000

Equity component of early extinguishment of 2023 convertible senior notes

(26,713,000)

$ 2,973,311

(26,713,000)

Proceeds from hedges related to 2023 convertible senior notes

405,851,000

Payments for warrants related to 2023 convertible senior notes

(358,622,000)

Purchases of hedges related to 2023 convertible senior notes

(74,094,000)

Other comprehensive income

127,846,000

1,211,000

Ending balance (in shares) at Jan. 31, 2020

(208,913,000)

$ (192,138,000)

$ (16,775,000)

113,990,069

8,647,779

Ending balance at Jan. 31, 2020

$ 405,344,000

$ 11,000

$ 1,000

$ 1,105,564,000

$ 892,000

$ (701,124,000)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Vesting of RSUs (in shares)

12,359,302

[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

Cash flows from operating activities:

Adjustments to reconcile net loss to net cash provided by (used in) operating activities:

$ (208,913)

$ (125,497)

^[1]

$ (109,849)

^[1]

Depreciation, amortization and accretion

126,624

76,320

^[1]

49,860

^[1]

17,815

8,001

^[1]

7,001

^[1]

Amortization of debt discount and issuance costs

25,892

14,279

^[1]

Amortization of deferred commissions

28,588

20,852

^[1]

15,180

^[1]

Deferred income taxes

(2,253)

(765)

^[1]

(534)

^[1]

Write-off of intangible assets

119

^[1]

1,114

^[1]

Loss on early extinguishment of debt

1,746

1,008

^[1]

708

^[1]

14,572

^[1]

Other, net

(130)

640

^[1]

719

^[1]

Changes in operating assets and liabilities:

Accounts receivable

(37,515)

(39,682)

^[1]

(18,321)

^[1]

Deferred commissions

(61,224)

(41,342)

^[1]

(26,986)

^[1]

Prepaid expenses and other assets

(4,080)

(10,334)

^[1]

(9,400)

^[1]

12,951

17,239

^[1]

7,776

^[1]

Accounts payable

1,689

(1,437)

^[1]

(2,464)

^[1]

Accrued compensation

23,034

7,429

^[1]

3,582

^[1]

Operating lease liabilities

9,972

5,800

^[1]

5,801

^[1]

(9,716)

(6,642)

^[1]

(7,087)

^[1]

Deferred revenue

116,432

89,303

^[1]

57,660

^[1]

Net cash provided by (used in) operating activities

55,603

15,172

^[1]

(25,240)

^[1]

Cash flows from investing activities:

Capitalization of internal-use software costs

(3,888)

(2,851)

^[1]

(5,431)

^[1]

Purchases of property and equipment

(15,442)

(19,811)

^[1]

(6,550)

^[1]

Proceeds from sales of property and equipment

740

^[1]

Purchases of securities available for sale and other

(999,387)

(631,488)

^[1]

(129,086)

^[1]

Proceeds from maturities and redemption of securities available for sale

356,277

298,650

^[1]

39,825

^[1]

Proceeds from sales of securities available for sale and other

27,271

173,072

^[1]

1,538

^[1]

Purchase of intangible assets

(8,589)

^[1]

Payments for business acquisition, net of cash acquired

(44,283)

(15,632)

^[1]

Net cash used in investing activities

(688,041)

(197,320)

^[1]

(99,704)

^[1]

Cash flows from financing activities:

Proceeds from initial public offering, net of underwriters' discounts and commissions

^[1]

199,948

^[1]

Proceeds from issuance of convertible senior notes, net of issuance costs

1,040,660

334,980

^[1]

Payments for repurchases of 2023 convertible senior notes

(224,414)

^[1]

Purchases of hedges related to 2023 convertible senior notes

(80,040)

^[1]

Proceeds from hedges related to 2023 convertible senior notes

405,851

^[1]

Proceeds from issuance of warrants related to 2023 convertible senior notes

52,440

^[1]

Payments for warrants related to 2023 convertible senior notes

(358,622)

^[1]

Purchases of capped calls related to 2025 convertible senior notes

(74,094)

^[1]

Payments of deferred offering costs

^[1]

(4,038)

^[1]

Proceeds from stock option exercises, net of repurchases

45,363

36,861

^[1]

33,646

^[1]

Proceeds from shares issued in connection with employee stock purchase plan

18,767

13,727

^[1]

8,369

^[1]

Other, net

(126)

(206)

^[1]

(517)

^[1]

Net cash provided by financing activities

853,385

357,762

^[1]

237,408

^[1]

Effects of changes in foreign currency exchange rates on cash, cash equivalents and restricted cash

(209)

(632)

^[1]

487

^[1]

Net increase in cash, cash equivalents and restricted cash

220,738

174,982

^[1]

112,951

^[1]

Cash, cash equivalents and restricted cash at beginning of year

^[1]

311,215

136,233

23,282

Cash, cash equivalents and restricted cash at end of year

531,953

311,215

^[1]

136,233

^[1]

Cash paid during the period for:

Interest

862

403

^[1]

Income taxes

1,123

514

^[1]

747

^[1]

Non-cash investing and financing activities:

Issuance of common stock for repurchases of 2023 convertible senior notes

380,406

^[1]

Vesting of early exercised common stock options

370

763

^[1]

1,335

^[1]

Issuance of common stock in connection with warrant exercises

272

Common stock issued as charitable contribution

1,746

1,008

^[1]

708

^[1]

Operating lease right-of-use assets exchanged for lease obligations

16,832

127,575

^[1]

44,668

^[1]

Property and equipment acquired through tenant improvement allowances

304

22,236

^[1]

Property and equipment and other accrued but not yet paid

855

7,225

^[1]

111

^[1]

Bonus settled through the issuance of common stock

2,809

^[1]

Issuance of common stock in connection with business combination

^[1]

2,160

^[1]

Conversion of redeemable convertible preferred stock to common stock

^[1]

228,362

^[1]

Reconciliation of cash, cash equivalents, and restricted cash within the consolidated balance sheets to the amounts shown in the statements of cash flows above:

Total cash, cash equivalents and restricted cash

^[1]

$ 311,215

$ 136,233

[1]	Adjusted for adoption of ASC 842. See Note 2.

Overview and Basis of Presentation	12 Months Ended
Overview and Basis of Presentation	Jan. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Overview and Basis of Presentation	Overview and Basis of Presentation Description of Business Okta, Inc. (the Company) is the leading independent identity management platform for the enterprise. The Okta Identity Cloud enables the Company's customers to securely connect people to technology, anywhere, anytime and from any device. The Company was incorporated in January 2009 as Saasure, Inc., a California corporation, and was later reincorporated in April 2010 under the name Okta, Inc. as a Delaware corporation. The Company is headquartered in San Francisco, California. Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). All intercompany balances and transactions have been eliminated in consolidation. Certain reclassifications of prior period amounts have been made in our consolidated balance sheets and consolidated statement of cash flows to conform to the current period presentation. We reclassified $14.8 million of certain accrued accounts payable to accrued expenses as of January 31, 2019. These reclassifications had no impact on net loss, stockholders’ equity or cash flows as previously reported. The Company’s fiscal year ends on January 31. References to fiscal 2020, for example, refer to the fiscal year ended January 31, 2020. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and on other assumptions that its management believes are reasonable under the circumstances. Actual results could vary from those estimates. The Company’s most significant estimates include the stand alone selling price (SSP) for each distinct performance obligation included in customer contracts with multiple performance obligations, the determination of the period of benefit for deferred commissions, the determination of the effective interest rate of the liability components of our convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation of deferred income tax assets and the valuation of acquired intangible assets. Foreign Currency The functional currencies of the Company’s foreign subsidiaries are the respective local currencies. Translation adjustments arising from the use of differing exchange rates from period to period are included in accumulated other comprehensive loss within the consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit). Foreign currency transaction gains and losses are included in other expense, net in the consolidated statements of operations and were not material for the years ended January 31, 2020, 2019 or 2018. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are translated at the average exchange rate during the period, and equity balances are translated using historical exchange rates.

Summary of Significant Accounting Policies

12 Months Ended

Jan. 31, 2020

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Segment Information

The Company operates in a single operating segment. The Company’s chief operating decision maker is its chief executive officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources.

Revenue Recognition

The Company derives revenue from subscription fees (which include support fees) and professional services fees. The Company sells subscriptions to its platform through arrangements that are generally one to five years in length. The Company’s arrangements are generally noncancelable and nonrefundable. Furthermore, if a customer reduces the contracted usage or service level, the customer has no right of refund. The Company’s subscription arrangements do not provide customers with the right to take possession of the software supporting the platform and, as a result, are accounted for as service arrangements. This revenue recognition policy is consistent for sales generated directly with customers and sales generated indirectly through channel partners.

The Company determines revenue recognition through the following steps:


•	Identification of the contract, or contracts, with a customer;


•	Identification of the performance obligations in the contract;


•	Determination of the transaction price;


•	Allocation of the transaction price to the performance obligations in the contract; and


•	Recognition of revenue when, or as, the Company satisfies a performance obligation.

Subscription Revenue

Subscription revenue, which includes support, is recognized on a straight-line basis over the noncancelable contractual term of the arrangement, generally beginning on the date that the Company’s service is made available to the customer.

Professional Services Revenue

The Company’s professional services principally consist of customer-specific requests for application integrations, user interface enhancements and other customer-specific requests. Revenue for the Company’s professional services is recognized as services are performed in proportion to their pattern of transfer.

Contracts with Multiple Performance Obligations

Some of the Company’s contracts with customers contain multiple performance obligations. For these contracts, the Company accounts for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative SSP basis. The Company determines SSP based on observable, if available, prices for those related services when sold separately. When such observable prices are not available, the Company determines SSP based on overarching pricing objectives and strategies, taking into consideration market conditions and other factors, including customer size, volume purchased, market and industry conditions, product-specific factors and historical sales of the deliverables.

Deferred Revenue

Deferred revenue consists primarily of payments received and accounts receivable recorded in advance of revenue recognition under the Company’s subscription and support services and professional services arrangements. The Company primarily invoices its customers for its subscription services arrangements annually in advance. The Company’s payment terms generally provide that customers pay the invoiced portion of the total arrangement fee within 30 days of the invoice date. Amounts anticipated to be recognized within one year of the balance sheet date are recorded as deferred revenue, current; the remaining portion is recorded as deferred revenue, noncurrent in the consolidated balance sheets.

Deferred Commissions

Sales commissions earned by the Company’s sales force are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions for new revenue contracts, including incremental sales to existing customers, are deferred and then amortized on a straight-line basis over a period of benefit, which the Company has determined to be generally five years. The Company determined the period of benefit by taking into consideration its customer contracts, its technology and other factors. Sales commissions for renewal contracts (which are not considered commensurate with sales commissions for new revenue contracts and incremental sales to existing customers) are deferred and then amortized on a straight-line basis over the related period of benefit, which is generally

the related contract renewal term. Amortization expense is included in sales and marketing expenses in the accompanying consolidated statements of operations.

Sales commissions capitalized as contract costs totaled $61.3 million and $41.3 million in the years ended January 31, 2020 and 2019, respectively. Amortization of contract costs was $28.6 million, $20.9 million and $15.2 million for the years ended January 31, 2020, 2019 and 2018, respectively. There was no impairment loss in relation to the costs capitalized.

Cost of Revenue

Costs of revenue primarily consist of costs related to providing the Company’s cloud-based platform to its customers, including third-party hosting fees, amortization of capitalized internal-use software and finite-lived purchased developed technology, customer support, other employee-related expenses for security, technical operations and professional services staff, and allocated overhead costs.

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents consist of cash on hand and highly liquid investments with original maturities of three months or less from the date of purchase. Cash equivalents generally consist of investments in money market funds. The fair market value of cash equivalents approximated their carrying value as of January 31, 2020 and 2019.

As of January 31, 2020 and 2019, the Company's long-term restricted cash balance was $11.4 million related to letters of credit for its facility lease agreements. Long-term restricted cash is included within other assets on the Company's consolidated balance sheet.

Short-term Investments

The Company’s short-term investments comprise asset-backed securities, U.S. treasury securities and corporate debt securities. The Company determines the appropriate classification of its short-term investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its short-term investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, the Company classifies its short-term investments, including securities with stated maturities beyond twelve months, within current assets in the consolidated balance sheets.

Available-for-sale securities are recorded at fair value each reporting period. Unrealized gains and losses on these short-term investments are reported as a separate component of accumulated other comprehensive loss in the consolidated balance sheets until realized. Interest income is reported within interest income and other, net in the consolidated statements of operations. The Company periodically evaluates its short-term investments to assess whether those with unrealized loss positions are other-than-temporarily impaired. The Company considers various factors in determining whether to recognize an impairment charge, including the length of time the investment has been in a loss position, the extent to which the fair value is less than the Company’s cost basis, the investment’s financial condition and near-term prospects of the investee. Realized gains and losses are determined based on the specific identification method and are reported in interest income and other, net in the consolidated statements of operations. If the Company determines that the decline in an investment’s fair value is other-than-temporary, the difference is recognized as an impairment loss in the consolidated statements of operations.

Accounts Receivable and Allowances

Accounts receivable are recorded at the invoiced amount, net of allowances. These allowances are based on the Company’s assessment of the collectibility of accounts by considering the age of each outstanding invoice, the collection history of each customer and an evaluation of potential risk of loss associated with delinquent accounts. Amounts deemed uncollectible are recorded to these allowances in the consolidated balance sheets with an offsetting decrease in related deferred revenue and a charge to general and administrative expense in the consolidated statement of operations.

Property and Equipment

Property and equipment, net, is stated at cost less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the respective assets. Repairs and maintenance costs are expensed as incurred.

The useful lives of property and equipment are as follows:



	Useful lives
Capitalized internal-use software costs	3 years
Computers and equipment	3 years
Furniture and fixtures	7 years
Leasehold improvements	Shorter of estimated useful life or remaining lease term

Business Combinations

When the Company acquires a business, the purchase price is allocated to the net tangible and identifiable intangible assets acquired. Any residual purchase price is recorded as goodwill. The allocation of the purchase price requires management to make estimates in determining the fair values of assets acquired and liabilities assumed, especially with respect to intangible assets. These estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, the appropriate weighted-average cost of capital and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable. During the measurement period, which may be up to one year from the acquisition date, adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed may be recorded, with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated statements of operations.

Goodwill and Other Long-Lived Assets

The excess of the purchase price over the estimated fair value of net assets of businesses acquired in a business combination is recognized as goodwill. Goodwill is tested for impairment annually on November 1^stor more frequently if certain indicators are present.

Long-lived assets, such as property and equipment and finite-lived intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of any asset may not be recoverable. Recoverability of assets to be held and used is measured by comparing the carrying amount to the estimated undiscounted future cash flows expected to be generated. If the carrying amount exceeds the undiscounted cash flows, the assets are determined to be impaired and an impairment charge is recognized as the amount by which the carrying amount exceeds its fair value.

The Company amortizes intangible assets with finite lives on a straight-line basis over their estimated useful lives in cost of revenue in the consolidated statements of operations.

Operating Leases and Incremental Borrowing Rate

The Company leases office space under operating leases with expiration dates through 2028. The Company determines whether an arrangement constitutes a lease and records lease liabilities and right-of-use assets on its consolidated balance sheets at lease commencement. Lease liabilities are measured based on the present value of the total lease payments not yet paid discounted based on the more readily determinable of either the rate implicit in the lease or the Company’s incremental borrowing rate, which is the estimated rate the Company would be required to pay for a collateralized borrowing equal to the total lease payments over the term of the lease. Lease liabilities due within twelve months are included within accrued expenses and other current liabilities on the Company's consolidated balance sheet. The estimation of the incremental borrowing rate is based on an analysis of publicly traded debt securities of companies with similar credit and financial profiles. Right-of-use assets are measured based on the corresponding lease liability adjusted for (i) payments made to the lessor at or before the commencement date, (ii) initial direct costs incurred and (iii) tenant incentives received, incurred or payable under the lease. Recognition of rent expense begins when the lessor makes the underlying asset available to the Company. The Company does not assume renewals or early terminations of its leases unless it is reasonably certain to exercise these options at commencement and does not allocate consideration between lease and non-lease components.

For short-term leases, the Company records rent expense in its condensed consolidated statements of operations on a straight-line basis over the lease term and records variable lease payments as incurred.

Convertible Senior Notes

In February 2018, the Company issued $345.0 million aggregate principal amount of 0.25% convertible senior notes due February 15, 2023 in a private offering (2023 Notes). In September 2019, the Company issued $1,060.0 million aggregate principal amount of 0.125% convertible senior notes due September 1, 2025 (2025 Notes, the 2025 Notes together with the 2023 Notes, the Notes). Concurrent with the issuance of the 2025 Notes, the Company used part of the net proceeds to repurchase a portion of the 2023 Notes (2023 Notes Partial Repurchase). See Note 9 for additional details.

The Notes are accounted for in accordance with FASB ASC Subtopic 470-20, Debt with Conversion and Other Options. Pursuant to ASC Subtopic 470-20, issuers of certain convertible debt instruments, such as the Notes, that have a net settlement feature and may be settled wholly or partially in cash upon conversion are required to separately account for the liability (debt) and equity (conversion option) components of the instrument. The carrying amount of the liability component of the instrument is computed by estimating the fair value of a similar liability without the conversion option using income and market based approaches. For the income-based approach, the Company uses a convertible bond pricing model that includes several assumptions such as volatility and the risk-free rate. For the market-based approach, the Company observes the price of derivative price instruments purchased in conjunction with our convertible senior note issuances or evaluates issuances of convertible debt securities by other companies with similar credit risk ratings at the time of issuance. The amount of the equity component is then calculated by deducting the fair value of the liability component from the principal amount of the instrument. The difference between the principal amount and the liability component represents a debt discount that is amortized to interest expense over the respective terms of the Notes using an effective interest rate method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the issuance costs related to the Notes, the allocation of issuance costs incurred between the liability and equity components were based on their relative values.

Similarly, in accordance with ASC Subtopic 470-20, transactions involving contemporaneous exchanges of cash between the same debtor and creditor in connection with the issuance of a new debt obligation and satisfaction of an existing debt obligation by the debtor, such as the contemporaneous 2023 Notes Partial Repurchase and issuance of the 2025 Notes, should be evaluated as a modification or an exchange transaction depending on whether the exchange is determined to have substantially different terms. The 2023 Notes Partial Repurchase and issuance of the 2025 Notes were deemed to have substantially different terms due to the significant difference between the value of the conversion option immediately prior to and after the exchange, and consequently, the 2023 Notes Partial Repurchase was accounted for as a debt extinguishment. Pursuant to ASC Subtopic 470-20, total consideration for the 2023 Notes Partial Repurchase was separated into liability and equity components by estimating the fair value of a similar liability without a conversion option and assigning the residual value to the equity component. The effective interest rate used to estimate the fair value of the liability component of the 2023 Notes Partial Repurchase is based on the income and market based approaches used to determine the effective interest rate of the 2025 Notes, adjusted for the remaining tenor of the 2023 Notes. The gain or loss on extinguishment of the debt is subsequently determined by comparing repurchase consideration allocated to the liability component to the sum of the carrying value of the liability component, net of the proportionate amounts of unamortized debt discount and remaining unamortized debt issuance costs.

Advertising Expenses

Advertising costs are expensed as incurred. Advertising expense was $17.0 million, $10.0 million, and $9.4 million for the years ended January 31, 2020, 2019 and 2018.

Income Taxes

The Company accounts for income taxes in accordance with the liability method of accounting for income taxes. Under this method, the Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax basis of assets and liabilities, as well as for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled.

The Company records a valuation allowance to reduce its deferred tax assets to the net amount that the Company believes is more likely than not to be realized. In assessing the need for a valuation allowance, the Company has considered its historical levels of income, expectations of future taxable income and ongoing tax planning strategies. Because of the uncertainty of the realization of the deferred tax assets, the Company has recorded a full valuation

allowance against its deferred tax assets. Realization of its deferred tax assets is dependent primarily upon future U.S. taxable income.

The Company recognizes and measures tax benefits from uncertain tax positions using a two-step approach.

The first step is to evaluate the tax position taken or expected to be taken by determining if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained in an audit, including resolution of any related appeals or litigation processes. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. Significant judgment is required to evaluate uncertain tax positions.

Although the Company believes that it has adequately reserved for its uncertain tax positions, it can provide no assurance that the final tax outcome of these matters will not be materially different. The Company evaluates its uncertain tax position on a regular basis and evaluations are based on a number of factors, including changes in facts and circumstances, changes in tax law, correspondence with tax authorities during the course of an audit and effective settlement of audit issues.

To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on the Company’s financial condition and results of operations. The provision for income taxes includes the effects of any accruals that the Company believes are appropriate, as well as the related net interest and penalties.

Concentrations of Risk and Significant Customers

The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments and accounts receivable. Cash and cash equivalents and short-term investments are currently held in three financial institutions and, at times, may exceed federally insured limits.

As of January 31, 2020 and 2019 and for each of the three years ended January 31, 2020, no single customer represented greater than 10% of accounts receivable or greater than 10% of revenue, respectively.

In order to reduce the risk of downtime of the Company’s subscription services, the Company uses data center facilities operated by a third party located in Virginia, Oregon, Ohio, Germany, Ireland, Singapore and Sydney. The Company has internal procedures to restore services in the event of disaster at any of its current data center facilities. Even with these procedures for disaster recovery in place, the Company’s subscription services could be significantly interrupted during the time period following a disaster at one of its sites and the subsequent restoration of services at another site.

Geographical Information

Revenue by location is determined by the billing address of the customer. The following table sets forth revenue by geographic area (in thousands):



	Year Ended January 31,
	2020		2019		2018
United States	$	494,529	$	337,367	$	217,300
International	91,538		61,887		39,247
Total	$	586,067	$	399,254	$	256,547

Other than the United States, no individual country exceeded 10% of total revenue for the years ended January 31, 2020, 2019 and 2018.

Property and equipment by geographic location is based on the location of the legal entity that owns the asset. As of January 31, 2020 and 2019, substantially all of the Company’s property and equipment was located in the United States.

Net Loss per Share

The Company computes basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for participating securities. Under the two-class method, basic net loss per share

attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase, without consideration for potentially dilutive securities as they do not share in losses. The diluted net loss per share attributable to common stockholders is computed giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, unvested restricted stock units, or RSUs, purchase rights issued under the 2017 Employee Stock Purchase Plan, or ESPP, shares subject to repurchase from early exercised options, unvested common stock and restricted stock issued in connection with certain business combinations, convertible senior notes and warrants are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as the effect is antidilutive. Since the Company's IPO, Class A and Class B common stock are the only outstanding equity of the Company. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion rights. See Note 13.

Recently Adopted Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases (Topic 842), which requires lessees to record a right-of-use asset and a corresponding lease liability on their balance sheet for most leases. The Company adopted the requirements of ASC 842 as of February 1, 2019, using the modified retrospective method for leases that existed as of February 1, 2017, or were entered into thereafter. The modified retrospective method provides a method for recording existing leases at adoption and in comparative periods that approximates the results of a full retrospective approach.

In order to simplify an entity’s transition, ASC 842 provides a package of three practical expedients, which must be elected together and applied consistently to all of an entity’s leases. The Company elected to use the package of practical expedients and, therefore, did not reassess:


•	whether contractual arrangements that expired prior to or existed as of February 1, 2017, are or contain leases,


•	the classification of leases that expired prior to or existed as of February 1, 2017, and


•	initial direct costs for leases that existed as of February 1, 2017.

As of the later of February 1, 2017 or each lease’s respective commencement date, the Company recorded lease liabilities equal to the present value of the remaining minimum lease payments and right-of-use assets equal to the corresponding lease liability adjusted for (i) any prepaid or accrued lease payments, (ii) the remaining balance of any lease incentives received, (iii) unamortized initial direct costs and (iv) any impairments.

The Company adjusted its consolidated balance sheet from amounts previously reported due to the adoption of ASC 842. Select consolidated balance sheet line items, which reflect the adoption of ASC 842, are as follows (in thousands):



	As of January 31, 2019
	As Reported		Adoption of ASC 842			As Adjusted
Assets
Current assets:
Prepaid expenses and other current assets	$	29,451	$	(1,214	)	$	28,237
Total current assets	709,330		(1,214		)	708,116
Operating lease right-of-use assets	—		121,389			121,389
Other noncurrent assets	15,286		(197		)	15,089
Total assets	$	864,335	$	119,978		$	984,313

Liabilities and stockholders’ equity
Current liabilities:
Accrued expenses and other liabilities	$	24,740	$	8,913		$	33,653
Total current liabilities	564,191		8,913			573,104
Operating lease liabilities, noncurrent	—		147,046			147,046
Other noncurrent liabilities	38,999		(35,981		)	3,018
Total liabilities	611,958		119,978			731,936
Total liabilities and stockholders’ equity	$	864,335	$	119,978		$	984,313

The Company’s consolidated statements of cash flows reflect the adoption of ASC 842. The adoption of ASC 842 did not have an impact on cash provided by or used in operating, investing, or financing activities or on the Company’s condensed consolidated statements of operations.

Recently Issued Accounting Pronouncements Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments, which changes the existing incurred loss impairment model for financial assets held at amortized cost. The new model uses a forward-looking expected loss method to calculate credit loss estimates. ASU 2016-13 also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. This guidance is effective for the Company on February 1, 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures and does not expect a material impact.

In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15), which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. This guidance is effective for the Company on February 1, 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures and does not expect a material impact.

In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes, which simplifies accounting for income taxes by revising or clarifying existing guidance in ASC 740, as well as removing certain exceptions within ASC 740. The guidance is effective for the Company on February 1, 2021 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures.

Business Combinations	12 Months Ended
Business Combinations	Jan. 31, 2020
Business Combinations [Abstract]
Business Combinations	Business Combinations On March 18, 2019, the Company acquired all issued and outstanding capital stock of Azuqua, Inc. (Azuqua), a company which provides a no-code, cloud-based integration platform that automates workflows between applications and services. The acquisition date cash consideration transferred for Azuqua was $44.2 million, net of $1.1 million in cash acquired. The Company recorded $15.7 million for developed technology intangible assets with an estimated useful life of five years and preliminarily recorded $29.9 million of goodwill which is primarily attributed to the assembled workforce as well as the integration of Azuqua’s technology and the Company’s technology. The Company incurred $3.0 million of acquisition-related costs, which were recorded as general and administrative expense in the quarter ended April 30, 2019. On July 13, 2018, the Company acquired all issued and outstanding capital stock of ScaleFT, Inc. (ScaleFT), a “zero trust” security company which provides access solutions for the modern workforce. The acquisition date cash consideration transferred for ScaleFT was $15.6 million, net of $0.6 million in cash acquired. The Company recorded $4.6 million for developed technology intangible assets with an estimated useful life of three years and $11.8 million of goodwill which is primarily attributed to the assembled workforce as well as the integration of ScaleFT’s technology and the Company’s technology. The Company incurred $1.1 million of acquisition-related costs, which were recorded as general and administrative expense in the quarter ended July 31, 2018. The Company also entered into deferred compensation arrangements in connection with these acquisitions totaling $10.8 million, of which $4.4 million was recognized as compensation during the year ended January 31, 2020. The remaining deferred compensation balance of $4.8 million is being recognized over a future weighted-average period of 1.6 years subject to continued service with the Company. These acquisitions did not have a material impact on the Company’s consolidated financial statements; therefore, historical and proforma disclosures have not been presented.

Cash Equivalents and Short-term Investments

12 Months Ended

Jan. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Cash Equivalents and Short-term Investments

The amortized cost, unrealized gain (loss) and estimated fair value of the Company’s cash equivalents and short-term investments as of January 31, 2020 and 2019 were as follows (in thousands):



	As of January 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	416,584	$	—	$	—		$	416,584
U.S. treasury securities	19,996		—		—			19,996
Total cash equivalents	436,580		—		—			436,580
Short-term investments:
U.S. treasury securities	575,920		686		(8		)	576,598
Corporate debt securities	305,859		519		—			306,378
Total short-term investments	881,779		1,205		(8		)	882,976
Total	$	1,318,359	$	1,205	$	(8	)	$	1,319,556



	As of January 31, 2019
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	247,426	$	—	$	—		$	247,426
Corporate debt securities	3,409		—		(1		)	3,408
Total cash equivalents	250,835		—		(1		)	250,834
Short-term investments:
U.S. treasury securities	195,913		37		(53		)	195,897
Corporate debt securities	69,483		13		(19		)	69,477
Total short-term investments	265,396		50		(72		)	265,374
Total	$	516,231	$	50	$	(73	)	$	516,208

All short-term investments were designated as available-for-sale securities as of January 31, 2020 and 2019.

The Company's short-term investments as of January 31, 2020 and 2019 all mature within one year, as follows (in thousands):



	As of January 31, 2020				As of January 31, 2019
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due within one year	$	881,779	$	882,976	$	265,396	$	265,374

The Company had 7 and 34 short-term investments in unrealized loss positions as of January 31, 2020 and 2019, respectively. There were no material gross unrealized gains or losses from available-for-sale securities and no material realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the years ended January 31, 2020, 2019 and 2018.

For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) the Company has the intention to sell any of these investments and (ii) it is not more likely than not that the Company will be required to sell any of these available-for-sale debt securities before recovery of the entire amortized cost basis. Based on this evaluation, the Company determined that there were no other-than-temporary impairments associated with short-term investments as of January 31, 2020 and 2019.

Fair Value Measurements

12 Months Ended

Jan. 31, 2020

Fair Value Disclosures [Abstract]

Fairv value measurements

Fair Value Measurements

The Company measures its financial assets at fair value each reporting period using a fair value hierarchy that prioritizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

Three levels of inputs may be used to measure as follows:

Level 1-Valuations based on observable inputs that reflect quoted prices for identical assets or liabilities in

active markets.

Level 2-Valuations based on other inputs that are directly or indirectly observable in the marketplace.

Level 3-Valuations based on unobservable inputs that are supported by little or no market activity.

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents information about the Company’s financial assets that were measured at fair value on a recurring basis using the above input categories (in thousands):



	As of January 31, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	416,584	$	—	$	—	$	416,584
U.S. treasury securities	$	—	$	19,996	$	—	19,996
Total cash equivalents	416,584		19,996		—		436,580
Short-term investments:
U.S. treasury securities	—		576,598		—		576,598
Corporate debt securities	—		306,378		—		306,378
Total short-term investments	—		882,976		—		882,976
Total cash equivalents and short-term investments	$	416,584	$	902,972	$	—	$	1,319,556



	As of January 31, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	247,426	$	—	$	—	$	247,426
Corporate debt securities	—		3,408		—		3,408
Total cash equivalents	247,426		3,408		—		250,834
Short-term investments:
U.S. treasury securities	—		195,897		—		$	195,897
Corporate debt securities	—		69,477		—		69,477
Total short-term investments	—		265,374		—		265,374
Total cash equivalents and short-term investments	$	247,426	$	268,782	$	—	$	516,208

The carrying amounts of certain financial instruments, including cash held in banks, accounts receivable and accounts payable approximate fair value due to their short-term maturities and are excluded from the fair value table above.

Fair Value Measurements of Other Financial Instruments

The following table presents the carrying amounts and estimated fair values of our financial instruments that are not recorded at fair value on the consolidated balance sheets (in thousands):



	As of January 31, 2020
	Net Carrying Amount⁽¹⁾		Estimated Fair Value
2023 Convertible senior notes	$	102,543	$	331,014
2025 Convertible senior notes	$	851,535	$	1,074,840

⁽¹⁾Before unamortized debt issuance costs.

The difference between the principal amount of the 2023 Notes and the 2025 Notes, $120.6 million and $1,060.0 million, respectively, and the net carrying amounts before unamortized debt issuance costs represents the unamortized debt discount (See Note 9 for additional details). The estimated fair values of the Notes, which are Level 2 financial instruments, were determined based on the quoted bid prices of the Notes in an over-the-counter market on the last trading day of the reporting period. As of January 31, 2020, the difference between the net carrying amount of the Notes and their estimated fair values represented the equity conversion value premium the market assigned to the Notes. Based on the closing price of our common stock of $128.05 on January 31, 2020, the if-converted value of the 2023 Notes exceeded the principal amount of $120.6 million, while the if-converted value of the 2025 Notes was less than the principal amount of $1,060.0 million.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

12 Months Ended

Jan. 31, 2020

Goodwill and Intangible Assets, net

Goodwill

As of January 31, 2020 and 2019, goodwill was $48.0 million and $18.1 million, respectively. During the year ended January 31, 2020, the Company recorded $29.9 million of goodwill in connection with the Azuqua acquisition that was completed in March 2019. See Note 3 for further details. No goodwill impairments were recorded during the years ended January 31, 2020, 2019 and 2018.

Goodwill balances as of January 31, 2020 and 2019 were as follows (in thousands):



	Goodwill
Balance at January 31, 2019	$	18,089
Goodwill recorded in connection with Azuqua acquisition	29,934
Balance at January 31, 2020	$	48,023

Intangible Assets, net

Intangible assets consisted of the following (in thousands):



	As of January 31, 2020
	Gross		Accumulated Amortization			Write-offs			Net
Capitalized internal-use software costs	$	24,890	$	(14,828	)	$	(119	)	$	9,943
Purchased developed technology	28,800		(6,321		)	—			22,479
Software licenses	1,112		(1,005		)	—			107
	$	54,802	$	(22,154	)	$	(119	)	$	32,529



	As of January 31, 2019
	Gross		Accumulated Amortization			Write-offs		Net
Capitalized internal-use software costs	$	19,838	$	(9,969	)	$	—	$	9,869
Purchased developed technology	4,600		(833		)	—		3,767
Software licenses	1,023		(762		)	—		261
	$	25,461	$	(11,564	)	$	—	$	13,897

The Company capitalized $5.1 million and $3.4 million of internal-use software costs during the years ended January 31, 2020 and 2019, respectively, which included $1.2 million and $0.5 million of stock-based compensation costs, respectively. Amortization expense of capitalized internal-use software costs totaled $4.9 million, $4.8 million and $2.7 million during the years ended January 31, 2020, 2019 and 2018, respectively. The Company wrote-off an immaterial amount and $1.1 million of previously capitalized costs in the years ended January 31, 2020 and 2018, respectively, as they were not realizable. The charges were recognized in research and development in the consolidated statements of operations.

During the year ended January 31, 2020, the Company recorded $24.2 million of purchased developed technology, of which $15.7 million related to the Azuqua acquisition (see Note 3 for further details), and the remainder was in connection with an asset acquisition in May 2019, whereby the Company recorded $8.5 million of purchased developed technology with an estimated useful life of five years. The remaining weighted-average useful life of all purchased developed technology was 3.9 and 2.5 years as of January 31, 2020, and 2019, respectively.

Amortization expense of intangible assets for the years ended January 31, 2020, 2019 and 2018 was $10.6 million, $5.8 million, and $2.9 million, respectively.

As of January 31, 2020, estimated remaining amortization expense for the intangible assets by fiscal year was as follows (in thousands):



	Remaining Amortization
2021	11,300
2022	8,403
2023	6,586
2024	5,356
2025	884
Total	$	32,529

Balance Sheet Components

12 Months Ended

Jan. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Balance Sheet Components

Property and Equipment, net

Property and equipment consisted of the following (in thousands):



	As of January 31,
	2020			2019
Computers and equipment	$	3,567		$	3,668
Furniture and fixtures	11,014			11,012
Leasehold improvements	55,363			47,883
Property and equipment, gross	69,944			62,563
Less accumulated depreciation	(16,409		)	(9,642		)
Property and equipment, net	$	53,535		$	52,921

Depreciation expense was $8.8 million, $5.7 million and $4.0 million for the years ended January 31, 2020, 2019 and 2018, respectively.

Allowances

The Company’s accounts receivable allowances for the years ended January 31, 2020, 2019 and 2018 were as follows (in thousands):



	As of January 31,
	2020			2019			2018
Balance, beginning of period	$	2,098		$	1,472		$	1,306
(Reductions) additions	(673		)	888			431
Write-offs	(259		)	(262		)	(265		)
Balance, end of period	$	1,166		$	2,098		$	1,472

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):



	As of January 31,
	2020		2019⁽¹⁾
Accrued expenses	22,530		21,174
Accrued taxes payable	1,591		1,195
Operating lease liabilities	12,064		10,914
Other	702		370
Accrued expenses and other current liabilities	$	36,887	$	33,653

⁽¹⁾Adjusted for adoption of ASC 842. See Note 2.

Other Liabilities, Noncurrent

Other liabilities, noncurrent consisted of the following (in thousands):



	As of January 31,
	2020		2019⁽¹⁾
Deferred tax liabilities	$	1,558	$	727
Other	3,803		2,291
Other liabilities, noncurrent	$	5,361	$	3,018

⁽¹⁾Adjusted for adoption of ASC 842. See Note 2.

Deferred Revenue and Performance Obligations	12 Months Ended
Deferred Revenue and Performance Obligations	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
Deferred Revenue and Performance Obligations	Deferred Revenue and Performance Obligations Deferred Revenue Deferred revenue, which is a contract liability, consists primarily of payments received and accounts receivable recorded in advance of revenue recognition under the Company’s contracts with customers and is recognized as the revenue recognition criteria are met. Subscription revenue recognized during the years ended January 31, 2020 and 2019 that was included in the deferred revenue balances at the beginning of the respective periods was $241.1 million and $157.9 million, respectively. Professional services and other revenue recognized in the years ended January 31, 2020 and 2019 from deferred revenue balances at the beginning of the respective periods was not material. Transaction Price Allocated to the Remaining Performance Obligations Transaction price allocated to the remaining performance obligations represents all future, noncancelable contracted revenue that has not yet been recognized, inclusive of deferred revenue that has been invoiced and noncancelable amounts that will be invoiced and recognized as revenue in future periods. As of January 31, 2020, total remaining noncancelable performance obligations under the Company’s subscription contracts with customers was approximately $1,209.7 million. Of this amount, the Company expects to recognize revenue of approximately $592.3 million, or 49%, over the next 12 months, with the balance to be recognized as revenue thereafter. Revenue from remaining performance obligations for professional services and other contracts as of January 31, 2020 was not material. Unbilled Receivables The Company receives payments from customers based on billing schedules as established in its contracts. Unbilled receivables and contract assets represent amounts for which the Company has recognized revenue in excess of billings pursuant to its revenue recognition policy. As of January 31, 2020 and January 31, 2019, contract assets and unbilled receivables were $1.0 million and $1.5 million, respectively, which are included in prepaid expenses and other current assets in the consolidated balance sheets.

Convertible Senior Notes, Net

12 Months Ended

Jan. 31, 2020

Debt Disclosure [Abstract]

Convertible Senior Notes, Net

2023 Convertible Senior Notes

The 2023 Notes are senior, unsecured obligations of the Company, and bear interest at a fixed rate of 0.25% per year. Interest is payable in cash semi-annually in arrears on February 15 and August 15 of each year, beginning on August 15, 2018. The 2023 Notes mature on February 15, 2023 unless earlier repurchased or converted. The Company may not redeem the 2023 Notes prior to maturity. The total net proceeds from the 2023 Notes, after deducting initial purchasers’ discounts and debt issuance costs, was $335.0 million.

In September 2019, the Company used part of the net proceeds from the issuance of the 2025 Notes for the 2023 Notes Partial Repurchase, which consisted of a repurchase of $224.4 million aggregate principal amount of the 2023 Notes in privately-negotiated transactions for aggregate consideration of $604.8 million, consisting of approximately $224.4 million in cash and approximately 3.0 million shares of Class A common stock. Of the $604.8 million in aggregate consideration, $197.7 million and $407.1 million were allocated to the debt and equity components, respectively, using an effective interest rate of 4.00% to determine the fair value of the liability component. This interest rate was based on the income and market based approaches used to determine the effective interest rate of the 2025 Notes, adjusted for the remaining tenor of the 2023 Notes. As of the repurchase date, the carrying value of the notes subject to the 2023 Notes Partial Repurchase, net of unamortized debt discount and issuance costs, was $183.1 million. The 2023 Notes Partial Repurchase resulted in a $14.6 million loss on early debt extinguishment, of which $3.8 million consisted of unamortized debt issuance costs. As of January 31, 2020, $120.6 million of principal remained outstanding on the 2023 Notes.

The terms of the 2023 Notes are governed by an Indenture by and between the Company and Wilmington Trust, National Association, as Trustee (the Indenture). Upon conversion, the 2023 Notes may be settled in cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at the Company’s election.

The 2023 Notes are convertible at an initial conversion rate of 20.6795 shares of Class A common stock per $1,000 principal amount of the 2023 Notes, which is equal to an initial conversion price of approximately $48.36 per share of Class A common stock, subject to adjustment under certain circumstances in accordance with the terms of the Indenture. Prior to the close of business on the business day immediately preceding October 15, 2022, holders of the 2023 Notes may convert all or a portion of their 2023 Notes only in multiples of $1,000 principal amount, under the following circumstances:

•

during any fiscal quarter commencing after the fiscal quarter ending on April 30, 2018 (and only during such fiscal quarter), if the last reported sale price of Class A common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the 2023 Notes on each applicable trading day;


•	during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the 2023 Notes for each trading day of that five consecutive trading day period was less than 98% of the product of the last reported sale price of Class A common stock and the conversion rate on such trading day; or


•	upon the occurrence of specified corporate events, as described in the Indenture.

On or after October 15, 2022 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2023 Notes regardless of the foregoing circumstances. For at least twenty trading days during the period of thirty consecutive trading days ended January 31, 2020, the last reported sale price of the Company’s common stock was equal to or exceeded 130% of the conversion price of the 2023 Notes on each applicable trading day. As a result, the 2023 Notes are convertible at the option of the holders during the fiscal quarter ending April 30, 2020 and were classified as current liabilities on the consolidated balance sheet as of January 31, 2020. In addition, as of the date of this filing, the Company has received an immaterial amount of conversion requests and holders of the 2023 Notes have converted an immaterial amount of such notes (which was not in connection with the 2023 Notes Partial Repurchase).

Holders of the 2023 Notes who convert their 2023 Notes in connection with certain corporate events that constitute a make-whole fundamental change (as defined in the Indenture) are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a fundamental change (as defined in the Indenture), holders of the 2023 Notes may require the Company to repurchase all or a portion of their 2023 Notes at a price equal to 100% of the principal amount of the 2023 Notes being repurchased, plus any accrued and unpaid interest.

In accounting for the issuance of the 2023 Notes, the Company separated the 2023 Notes into liability and equity components, utilizing an effective interest rate of 5.68% to determine the fair value of the liability component. This interest rate was based on both an income and a market based approach. For the income approach, the Company used a convertible bond pricing model, which included several assumptions including volatility and the risk-free rate. For the market approach, the Company observed the price of the Note Hedge (see below) it purchased for its 2023 Notes and also performed an evaluation of issuances of convertible debt securities by other companies with similar credit risk ratings at the time of issuance. The following table sets forth total interest expense recognized related to the 2023 Notes (in thousands):



	Year Ended January 31,
	2020		2019
Contractual interest expense	$	606	$	793
Amortization of debt issuance costs	985		1,085
Amortization of debt discount	11,219		13,194
Total	$	12,810	$	15,072

Total issuance costs of $10.0 million related to the 2023 Notes were allocated between liability and equity in the same proportion as the allocation of the total proceeds to the liability and equity components. Issuance costs attributable to the liability component are being amortized to interest expense over the respective term of the 2023 Notes using the effective interest rate method. The issuance costs attributable to the equity component were netted against the respective equity component in Additional paid-in capital. The Company recorded liability issuance costs of $7.7 million and equity issuance costs of $2.3 million.

The 2023 Notes, net consisted of the following (in thousands):



	As of January 31, 2020
Liability component:
Principal	$	120,588
Less: unamortized debt issuance costs and debt discount	(19,885		)
Net carrying amount	$	100,703

Equity component:
2023 Notes	$	27,949
Less: issuance costs	(811		)
Carrying amount of the equity component⁽¹⁾	$	27,138

⁽¹⁾Included in the consolidated balance sheets within Additional paid-in capital.

Note Hedges

In connection with the pricing of the 2023 Notes, the Company entered into convertible note hedge transactions with respect to its Class A common stock (Note Hedges). The Note Hedges are purchased call options that give the Company the option to purchase, subject to anti-dilution adjustments substantially identical to those in the 2023 Notes, approximately 7.1 million shares of its Class A common stock for approximately $48.36 per share (subject to adjustment), corresponding to the approximate initial conversion price of the 2023 Notes, exercisable upon conversion of the 2023 Notes. The Note Hedges will expire in 2023, if not exercised earlier. The Note Hedges are intended to offset potential dilution to the Company’s Class A common stock and/or offset the potential cash payments that the Company could be required to make in excess of the principal amount upon any conversion of the 2023 Notes under certain circumstances. The Note Hedges are separate transactions and are not part of the terms of the 2023 Notes.

The Company paid an aggregate amount of $80.0 million for the Note Hedges. The amount paid for the Note Hedges was recorded as a reduction to Additional paid-in capital in the consolidated balance sheets.

In September 2019, and in connection with the 2023 Notes Partial Repurchase, the Company terminated Note Hedges corresponding to approximately 4.6 million shares for cash proceeds of $405.9 million. The proceeds were recorded as an increase to Additional paid-in capital in the consolidated balance sheets. As of January 31, 2020, Note Hedges giving the Company the option to purchase approximately 2.5 million shares (subject to adjustment) remained outstanding.

Warrants

In connection with the issuance of the 2023 Notes, the Company also entered into separate warrant transactions pursuant to which it sold net-share-settled (or, at the Company’s election subject to certain conditions, cash-settled) warrants to acquire, subject to anti-dilution adjustments, up to approximately 7.1 million shares over 80 scheduled trading days beginning in May 2023 of the Company’s Class A common stock at an initial exercise price of approximately $68.06 per share (subject to adjustment). If the Warrants are not exercised on their exercise dates, they will expire. If the market value per share of the Company’s Class A common stock exceeds the applicable exercise price of the Warrants, the Warrants could have a dilutive effect on the Company’s Class A common stock unless, subject to the terms of the Warrants, the Company elects to cash settle the Warrants. The Warrants are separate transactions and are not part of the terms of the 2023 Notes or the Note Hedges.

The Company received aggregate proceeds of $52.4 million from the sale of the Warrants in connection with the 2023 Notes. The proceeds from the sale of the Warrants were recorded as an increase to Additional paid-in capital in the consolidated balance sheets.

In September 2019, and in connection with the 2023 Notes Partial Repurchase, the Company terminated Warrants corresponding to approximately 4.6 million shares for total cash payments of $358.6 million. The termination payment was recorded as a decrease to Additional paid-in capital in the consolidated balance sheets. As of January 31, 2020, Warrants to acquire up to approximately 2.5 million shares (subject to adjustment) remained outstanding.

2025 Convertible Senior Notes

The 2025 Notes are senior, unsecured obligations of the Company, and bear interest at a fixed rate of 0.125% per year. Interest is payable in cash semi-annually in arrears on March 1 and September 1 of each year, beginning on March 1, 2020. The 2025 Notes mature on September 1, 2025 unless earlier redeemed, repurchased or converted. The total net proceeds from the 2025 Notes, after deducting initial purchasers’ discounts and debt issuance costs, were $1,040.7 million.

The terms of the 2025 Notes are governed by an Indenture by and between the Company and Wilmington Trust, National Association, as Trustee (the Indenture). Upon conversion, the 2025 Notes may be settled in cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at the Company’s election.

The 2025 Notes are convertible at an initial conversion rate of 5.2991 shares of class A common stock per $1,000 principal amount of the 2025 Notes, which is equal to an initial conversion price of approximately $188.71 per share of Class A common stock, subject to adjustment under certain circumstances in accordance with the terms of the Indenture. Prior to the close of business on the business day immediately preceding June 1, 2025, holders of the 2025 Notes may convert all or a portion of their 2025 Notes only in multiples of $1,000 principal amount, under the following circumstances:

•

during any fiscal quarter commencing after the fiscal quarter ending on January 31, 2020 (and only during such fiscal quarter), if the last reported sale price of Class A common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the 2025 Notes on each applicable trading day;


•	during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the 2025 Notes for each trading day of that five consecutive trading day period was less than 98% of the product of the last reported sale price of Class A common stock and the conversion rate on such trading day;


•	if the Company calls the notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or


•	upon the occurrence of specified corporate events, as described in the Indenture.

On or after June 1, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2025 Notes regardless of the foregoing circumstances. During the year ended January 31, 2020, the conditions allowing holders of the 2025 Notes to convert were not met.

The Company may redeem for cash all or any portion of the 2025 Notes, at its option, on or after September 6, 2022, if the last reported sale price of the Company’s Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on and including the trading day preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the 2025 Notes to be redeemed, plus any accrued and unpaid interest to, but excluding, the redemption date. During the year ended January 31, 2020, the Company had not redeemed any of the 2025 Notes.

Holders of the 2025 Notes who convert their 2025 Notes in connection with certain corporate events that constitute a make-whole fundamental change (as defined in the Indenture) or in connection with the Company’s issuance of a redemption notice are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a fundamental change (as defined in the Indenture), holders of the 2025 Notes may require the Company to repurchase all or a portion of their 2025 Notes at a price equal to 100% of the principal amount of the 2025 Notes being repurchased, plus any accrued and unpaid interest.

In accounting for the issuance of the 2025 Notes, the Company separated the 2025 Notes into liability and equity components utilizing an effective interest rate of 4.10% to determine the fair value of the liability component. This interest rate was based on both an income and a market based approach. For the income approach, the Company used a convertible bond pricing model, which included several assumptions including volatility and the risk-free rate. For the market approach, the Company performed an evaluation of issuances of convertible debt securities by other companies with similar credit risk ratings at the time of issuance. The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):



	Year Ended January 31, 2020
Contractual interest expense	$	519
Amortization of debt issuance costs	769
Amortization of debt discount	12,919
Total	$	14,207

Total issuance costs of $19.3 million related to the 2025 Notes were allocated between liability and equity in the same proportion as the allocation of the total proceeds to the liability and equity components. Issuance costs attributable to the liability component are being amortized to interest expense over the respective term of the 2025 Notes using the effective interest rate method. The issuance costs attributable to the equity component were netted against the respective equity component in Additional paid-in capital. The Company recorded liability issuance costs of $15.3 million and equity issuance costs of $4.0 million.

The 2025 Notes, net consisted of the following (in thousands):



	As of January 31, 2020
Liability component:
Principal	$	1,060,000
Less: unamortized debt issuance costs and debt discount	(222,998		)
Net carrying amount	$	837,002

Equity component:
2025 Notes	$	221,387
Less: issuance costs	(4,040		)
Carrying amount of the equity component⁽¹⁾	$	217,347

⁽¹⁾Included in the consolidated balance sheets within Additional paid-in capital.

Capped Calls

In connection with the pricing of the 2025 Notes, the Company entered into capped call transactions with respect to its Class A common stock (Capped Calls). The Capped Calls are purchased call options that give the Company the option to purchase, subject to anti-dilution adjustments substantially identical to those in the 2025 Notes, approximately 5.6 million shares of its Class A common stock for approximately $188.71 per share (subject to adjustment), corresponding to the approximate initial conversion price of the 2025 Notes, exercisable upon conversion of the 2025 Notes. The Capped Calls have initial cap prices of $255.88 per share (subject to adjustment) and will expire in 2025, if not exercised earlier. The Capped Calls are intended to offset potential dilution to the Company’s Class A common stock and/or offset the potential cash payments that the Company could be required to make in excess of the principal amount upon any conversion of the 2025 Notes under certain circumstances. The Capped Calls are separate transactions and are not part of the terms of the 2025 Notes.

The Company paid an aggregate amount of $74.1 million for the Capped Calls. The amount paid for the Capped Calls was recorded as a reduction to Additional paid-in capital in the consolidated balance sheets.

Leases Leases

12 Months Ended

Jan. 31, 2020

Leases [Abstract]

Leases

The Company has entered into various non-cancelable office space operating leases with original lease periods expiring between 2020 and 2028. These leases do not contain material variable rent payments, residual value guarantees, covenants or other restrictions. The Company's corporate headquarters lease in San Francisco has a 10 year term, which expires in October 2028. The Company is entitled to two five-year options to extend this lease, subject to certain requirements.

The Company has various sublease agreements with third parties. The subleases have remaining lease terms of between five months and five years. Sublease income, which is recorded as a reduction of rental expense, was $3.2 million for the year ended January 31, 2020 and nil for each of the years ended January 31, 2019 and 2018.

Operating lease costs were as follows (in thousands):



	Year Ended January 31,
	2020		2019		2018
Operating lease costs⁽¹⁾	$	23,193	$	23,290	$	10,588

⁽¹⁾Amounts are presented exclusive of sublease income and include short-term leases, which are immaterial.

The weighted-average remaining term of the Company’s operating leases was 7.9 years and 8.9 years and the weighted-average discount rate used to measure the present value of the operating lease liabilities was 5.7% and 5.8% as of January 31, 2020 and January 31, 2019, respectively.

Maturities of the Company’s operating lease liabilities, which do not include short-term leases, as of January 31, 2020 were as follows (in thousands):



	Operating Leases
2021	$	21,225
2022	27,512
2023	27,532
2024	28,110
2025	25,768
Thereafter	81,209
Total lease payments	211,356
Less imputed interest	(44,781		)
Total operating lease liabilities	$	166,575

Cash payments included in the measurement of the Company’s operating lease liabilities were $18.3 million and $12.9 million for the years ended January 31, 2020 and January 31, 2019, respectively.

As of January 31, 2020, the Company has $56.9 million of undiscounted future payments under various operating leases that have not yet commenced, which are excluded from the table above. These operating leases will commence in fiscal 2021 and have lease terms between 1.3 years and 8.7 years.

Commitments and Contingencies

12 Months Ended

Jan. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Letters of Credit

In conjunction with the execution of certain office space operating leases, letters of credit in the aggregate amount of $11.9 million and $12.7 million were issued and outstanding as of January 31, 2020 and 2019, respectively. No draws have been made under such letters of credit.

Purchase Obligations

As of January 31, 2020, future minimum purchase obligations, such as data center operations and sales and marketing activities, were as follows (in thousands):



	Purchase Obligations
2021	$	56,413
2022	39,110
2023	30,398
2024	30,000
Total contractual obligations	$	155,921

Legal Matters

From time to time in the normal course of business, the Company may be subject to various legal matters such as threatened or pending claims or proceedings. There were no such material matters as of January 31, 2020 and 2019.

Warranties and Indemnification

The Company’s subscription services are generally warranted to perform materially in accordance with the Company’s online help documentation under normal use and circumstances. Additionally, the Company’s arrangements generally include provisions for indemnifying customers against liabilities if its subscription services infringe a third party’s intellectual property rights. Furthermore, the Company may also incur liabilities if it breaches the security or confidentiality obligations in its arrangements. To date, the Company has not incurred significant costs and has not accrued a liability in the accompanying consolidated financial statements as a result of these obligations.

The Company has entered into service-level agreements with a majority of its customers defining levels of uptime reliability and performance and permitting those customers to receive credits for prepaid amounts related to unused subscription services if the Company fails to meet the defined levels of uptime. In very limited instances, the Company allows customers to early terminate their agreements in the event that the Company fails to meet those levels as they may constitute a breach of contract. If the customer did terminate, they would receive a refund of prepaid unused subscription fees. To date, the Company has not experienced any significant failures to meet defined levels of uptime reliability and performance as a result of those agreements and, as a result, the Company has not accrued any liabilities related to these agreements in the consolidated financial statements.

Common Stock and Stockholders' Equity

12 Months Ended

Jan. 31, 2020

Equity [Abstract]

Common Stock and Stockholders' Equity

Common Stock

Holders of Class A and Class B common stock are entitled to one vote per share and 10 votes per share, respectively, and the shares of Class A common stock and Class B common stock are identical, except for voting and conversion rights. Shares of Class B common stock may be converted into Class A common stock at any time at the option of the stockholder on a one-for-one basis, and are automatically converted into Class A common stock upon sale or transfer, subject to certain limited exceptions. Shares of Class A common stock are not convertible.

In September 2019, in connection with the 2023 Notes Partial Repurchase, the Company issued approximately 3.0 million shares of Class A common stock. See Note 9 for additional details.

As of January 31, 2020, shares of common stock reserved for future issuance were as follows:



	As of January 31, 2020
Options and unvested RSUs outstanding	17,252,543
Available for future stock option and RSU grants	16,456,003
Available for ESPP	3,653,857
	37,362,403

Awards Issued as Charitable Contributions

During the years ended January 31, 2020, 2019 and 2018, the Company issued 15,000, 20,000 and 24,287 shares, respectively, of Class A common stock as charitable contributions and recognized $1.7 million, $1.0 million and $0.7 million, respectively, as general and administrative expense in the consolidated statements of operations.

Employee Incentive Plans

12 Months Ended

Jan. 31, 2020

Share-based Payment Arrangement [Abstract]

Employee Incentive Plans

The Company’s equity incentive plans provide for granting stock options, RSUs and restricted stock awards to employees, consultants, officers and directors. In addition, the Company offers an ESPP to eligible employees.

Stock-based compensation expense by award type was as follows (in thousands):



	Year Ended January 31,
	2020		2019		2018
Stock options	$	21,888	$	23,466	$	24,186
RSUs	94,637		41,637		9,104
ESPP	9,408		7,248		7,111
Restricted stock awards	590		1,608		3,281
Restricted common stock	101		2,361		6,178
Total	$	126,624	$	76,320	$	49,860

Stock-based compensation expense was recorded in the following cost and expense categories in the Company’s consolidated statements of operations (in thousands):



	Year Ended January 31,
	2020		2019		2018
Cost of revenue:
Subscription	$	12,923	$	7,837	$	4,600
Professional services and other	7,164		4,983		3,137
Research and development	37,683		22,642		18,107
Sales and marketing	38,077		22,916		13,242
General and administrative	30,777		17,942		10,774
Total	$	126,624	$	76,320	$	49,860

Stock-based compensation expense recorded to research and development in the consolidated statements of operations exclude amounts that were capitalized related to internal-use software for the years ended January 31, 2020, 2019 and 2018. See Note 6 for additional details.

Equity Incentive Plans

The Company has two equity incentive plans: the 2009 Stock Plan (2009 Plan) and the 2017 Equity Incentive Plan (2017 Plan). All shares that remain available for future grants are under the 2017 Plan. As of January 31, 2020, options to purchase 11,348,049 shares of Class B common stock and 1,011,253 shares of Class A common stock remained outstanding. As of January 31, 2020, the total number of shares reserved for future Class A stock grants under the 2017 Plan was 16,456,003 shares, including shares transferred from the 2009 Plan.

Stock Options

Options issued to new employees under the Plan generally are exercisable for periods not to exceed ten years and generally vest over four years with 25% vesting after one year and with the remainder vesting monthly thereafter in equal installments. Shares offered under the Plan may be: (i) authorized but unissued shares or (ii) treasury shares.

A summary of the Company’s stock option activity and related information was as follows:



	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 2019	17,803,794		$	9.16	7.1	$	1,304,446
Granted	415,547		82.33
Exercised	(5,422,281	)	8.37
Canceled	(437,758	)	13.35
Outstanding as of January 31, 2020	12,359,302		$	11.82	6.2	$	1,436,487
As of January 31, 2020:
Vested and expected to vest	12,359,302		$	11.82	6.2	$	1,436,487
Vested and exercisable	8,723,638		$	8.16	5.9	$	1,045,852

The weighted-average grant-date fair value of options granted was $37.35, $17.21 and $5.40 during the years ended January 31, 2020, 2019 and 2018, respectively. The total grant-date fair value of stock options vested was $23.7 million, $23.8 million and $23.9 million during the years ended January 31, 2020, 2019 and 2018, respectively. The intrinsic value of the options exercised, which represents the difference between the fair market value of the Company’s common stock on the date of exercise and the exercise price of each option, was $558.6 million, $309.3 million and $204.8 million for the years ended January 31, 2020, 2019 and 2018, respectively.

As of January 31, 2020 and January 31, 2019, there was a total of $28.2 million and $37.3 million, respectively, of unrecognized stock-based compensation expense, which is being recognized over a weighted-average period of 1.4 and 1.9 years, respectively.

The Company used the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions:



	Year Ended January 31,
	2020		2019		2018
Expected volatility	43	%	40	%	40% - 41%
Expected term (in years)	6.3		6.3		6.3 - 6.4
Risk-free interest rate	1.55% - 2.27%		2.70	%	1.87% - 2.21%
Expected dividend yield	—		—		—

Restricted Stock Units

A summary of the Company’s RSU activities and related information is as follows:



	Number of RSUs		Weighted- Average Grant Date Fair Value Per Share
Outstanding as of January 31, 2019	4,835,536		$	44.49
Granted	2,458,095		114.07
Vested	(1,752,333	)	44.69
Forfeited	(648,057	)	54.94
Outstanding as of January 31, 2020	4,893,241		$	77.99

The Company granted 2,458,095 RSUs with an aggregate fair value of $280.4 million for the year ended January 31, 2020. As of January 31, 2020, there was $335.9 million of unrecognized stock-based compensation expense related to unvested RSUs, which is being recognized over a weighted-average period of 2.7 years based on vesting under the award service conditions.

Equity Awards Issued in Connection with Business Combinations

In connection with the Stormpath transaction in February 2017, the Company issued 800,000 shares of restricted common stock to Stormpath with an aggregate fair value of $8.6 million, of which 400,000 shares vested during each year ended January 31, 2020 and January 31, 2019. The stock-based compensation expense related to the restricted common stock was recognized using an accelerated attribution method over two years.

The Company separately entered into retention arrangements with certain employees of Stormpath and issued 598,500 restricted stock awards with performance conditions under the 2009 Plan, with an aggregate fair value of $6.6 million. The restricted stock awards vest ratably over two or three years from the transaction date, and 210,850 of these shares vested during each of the years ended January 31, 2020 and 2019. Additionally, the Company granted 518,900 service-based stock options under the 2009 Plan to certain Stormpath employees with an aggregate fair value of $2.5 million to vest ratably over the requisite four-year service period. Of the $9.1 million total aggregate fair value of the awards, $1.5 million is related to pre-combination service and was recognized as goodwill. The post-combination expenses for the restricted stock awards and stock options are $5.5 million and $2.1 million, respectively. The expense

related to the restricted stock awards is being recognized over two or three years based on an accelerated attribution method. The expense for the stock options is being recognized ratably over the requisite service period.

As of January 31, 2020, the remaining unrecognized compensation cost was immaterial.

Employee Stock Purchase Plan

In February 2017, the Company’s board of directors adopted, and in March 2017, the Company’s stockholders approved the ESPP, which became effective prior to the completion of the IPO. The ESPP initially reserves and authorizes the issuance of up to a total of 3,000,000 shares of Class A common stock to participating employees. Except for the initial offering period which began April 7, 2017 and ended on June 20, 2018, or stock price changes that would reset the offering period after the initial six-month purchase period, the ESPP provides for 12-month offering periods beginning June 21 and December 21 of each year, and each offering period consists of up to two six-month purchase periods.

The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:



	Year Ended January 31,
	2020	2019	2018
Expected volatility	43% - 59%	39% - 70%	32% - 38%
Expected term (in years)	0.5 - 1.0	0.5 - 1.0	0.5 - 1.2
Risk-free interest rate	1.53% - 2.05%	2.12% - 2.62%	0.95% - 1.73%
Expected dividend yield	—	—	—

During the year ended January 31, 2020, the Company's employees purchased 322,795 shares of its Class A common stock under the ESPP. The shares were purchased at a weighted-average purchase price of $58.14, with proceeds of $18.8 million. During the year ended January 31, 2019, the Company's employees purchased 615,210 shares of its Class A common stock under the ESPP. The shares were purchased at a weighted-average purchase price of $22.31 with proceeds of $13.7 million.

As of January 31, 2020, there was $8.8 million of unrecognized stock-based compensation expense related to the ESPP that is expected to be recognized over an average vesting period of 0.6 years.

Income Taxes

12 Months Ended

Jan. 31, 2020

Income Tax Disclosure [Abstract]

Income Taxes

The domestic and foreign components of pre-tax loss for the years ended January 31, 2020, 2019 and 2018 were as follows (in thousands):



	Year Ended January 31,
	2020			2019			2018
Domestic	$	(220,846	)	$	(128,214	)	$	(112,858	)
Foreign	10,514			2,700			2,688
Loss before benefit from income taxes	$	(210,332	)	$	(125,514	)	$	(110,170	)

The components of the benefit from income taxes for the years ended January 31, 2020, 2019 and 2018 were as follows (in thousands):



	Year Ended January 31,
	2020			2019			2018
Current:
Federal	$	33		$	—		$	—
State	86			61			—
Foreign	822			667			183
Total current provision for income taxes	941			728			183
Deferred:
Federal	(518		)	(620		)	(32		)
State	(406		)	(130		)	10
Foreign	(1,436		)	5			(482		)
Total deferred benefit from income taxes	(2,360		)	(745		)	(504		)
Total benefit from income taxes	$	(1,419	)	$	(17	)	$	(321	)

For the tax year ended January 31, 2020 the income tax benefit resulted from the release of valuation allowance in the United States in connection with the Azuqua acquisition and excess tax benefits from stock-based compensation in the United Kingdom. For the tax year ended January 31, 2019, the income tax benefit resulted from the release of valuation allowance in the United States in connection with the ScaleFT acquisition and excess tax benefits from stock-based compensation in the United Kingdom. The income tax benefits in the years ended January 31, 2020 and 2019 were partially offset by foreign income taxes, state taxes and tax amortization of goodwill. For the year ended January 31, 2018, the income tax benefit resulted from $1.3 million of excess tax deductions related to option exercises by foreign employees, a portion of which we used to claim a refund for taxes paid in prior years.

The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended January 31, 2020, 2019 and 2018:



	Year Ended January 31,
	2020		2019		2018
Tax at federal statutory rate	21.0	%	21.0	%	33.8	%
State income taxes, net of federal benefit	4.0		3.8		3.4
Change in valuation allowance	(100.1	)	(68.5	)	(27.1	)
Stock-based compensation	59.8		45.5		42.4
Research and development credits	18.0		—		—
Tax Cuts and Jobs Act of 2017	—		—		(51.3	)
Other, net	(2.0	)	(1.8	)	(0.9	)
Effective tax rate	0.7	%	—	%	0.3	%

The tax effects of temporary differences and related deferred tax assets and liabilities as of January 31, 2020 and 2019 were as follows (in thousands):



	As of January 31,
	2020			2019
				As Adjusted⁽¹⁾
Deferred tax assets:
Net operating loss carryforwards	$	370,705		$	202,471
Stock-based compensation	18,680			13,185
Deferred revenue	1,960			1,312
Operating lease liabilities	42,073			39,060
Other reserves and accruals	6,414			3,750
Research and development and other credits	39,918			791
Convertible debt	—			477
Disallowed interest	4,507			1,292
Total deferred tax assets	484,257			262,338
Valuation allowance	(361,606		)	(203,899		)
Total deferred tax assets, net	122,651			58,439
Deferred tax liabilities:
Convertible debt	(50,963		)	—
Deferred commissions	(27,569		)	(19,424		)
Capitalized internal-use software costs	(2,248		)	(2,047		)
Goodwill	(262		)	(217		)
Operating lease right-of-use assets	(31,165		)	(29,697		)
Depreciation and amortization	(8,315		)	(6,492		)
Total deferred tax liabilities	(120,522		)	(57,877		)
Net deferred tax assets	$	2,129		$	562


⁽¹⁾	Adjusted for adoption of ASC 842. See Note 2.

As a result of continuing losses, the Company has determined that it is not more likely than not that it will realize the benefits of the U.S. deferred tax assets and, therefore, the Company has recorded a valuation allowance to reduce the carrying value of the U.S. deferred tax assets, net of U.S. deferred tax liabilities, to approximately zero. The U.S. valuation allowance increased by $157.7 million and $86.6 million during the years ended January 31, 2020 and 2019, respectively.

As of January 31, 2020, the Company had approximately $1,462.6 million of federal and $919.5 million of state net operating loss carryforwards available to offset future taxable income. If not used, the federal and state net operating loss carryforwards will begin to expire in 2029 and 2021, respectively. As of January 31, 2020, the Company had approximately $29.9 million of UK net operating losses which do not expire.

As of January 31, 2020, the Company had federal research and development tax credit carryforwards of $35.3 million and California research and development tax credit carryforwards of $23.4 million. The federal research and development credits will start to expire in 2030 while the California research and development credits do not expire. The Company also had California Enterprise Zone credits of $1.0 million that begin to expire in 2023.

The Company’s ability to use the net operating loss and tax credit carryforwards in the future may be subject to substantial restrictions in the event of past or future ownership changes as defined in Section 382 of the Internal Revenue Code and similar state tax laws.

The Company attributes net revenue, costs and expenses to domestic and foreign components based on the terms of its agreements with its subsidiaries. The Company does not provide for federal income taxes on the undistributed earnings of its foreign subsidiaries as such earnings are to be reinvested offshore indefinitely. If the Company repatriated these earnings, the resulting income tax liability would be insignificant. The Company is subject to taxation in the United States and various states and foreign jurisdictions.

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“Tax Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease to effective for tax years beginning after December 31, 2017. This change in tax rate resulted in a reduction in the Company's net U.S. deferred tax assets before valuation allowance by $56.5 million, which was fully offset by a reduction in the Company's valuation allowance.

A reconciliation of beginning and ending amount of unrecognized tax benefit was as follows (in thousands):



	Year Ended January 31,
	2020			2019		2018
Gross amount of unrecognized tax benefits as of the beginning of the year	$	23,931		$	11,719	$	5,775
Additions based on tax positions related to a prior year	658			1,859		—
Additions based on tax positions related to current year	6,866			10,353		5,944
Reductions based on tax positions related to current year	—			—		—
Reductions based on tax positions taken in a prior year	(15,468		)	—		—
Gross amount of unrecognized tax benefits as of the end of the year	$	15,987		$	23,931	$	11,719

The Company is subject to taxation in the U.S. and various other state and foreign jurisdictions. As the Company has net operating loss carryforwards for U.S. federal and state jurisdictions, the statute of limitations is open for all years. For material foreign jurisdictions, the tax years open to examination include the tax years 2015 and forward.

As of January 31, 2020, 2019 and 2018, the Company had unrecognized tax benefits which would not impact the effective tax rate because of the valuation allowance. The Company's policy is to include interest and penalties related to unrecognized tax benefits within the provision for income taxes. The Company did not have any uncertain tax positions as of January 31, 2020 for which it was reasonably possible that the positions will increase or decrease within the next twelve months. As of January 31, 2020 and 2019, the Company had not accrued any interest or penalties related to unrecognized tax benefits.

Net Loss Per Share

12 Months Ended

Jan. 31, 2020

Earnings Per Share [Abstract]

Net Loss Per Share

The Company computes net loss per share of common stock in conformity with the two-class method required for participating securities. The Company considers all series of preferred stock to be participating securities as the holders of the preferred stock are entitled to receive a non-cumulative dividend on a pari passu basis in the event that a dividend is paid on the common stock. The holders of the preferred stock do not have a contractual obligation to share in the Company’s losses. As such, the Company’s net loss for the year ended January 31, 2018 was not allocated to these participating securities. Upon the closing of the IPO in April 2017, all shares of the Company’s then-outstanding redeemable convertible preferred stock automatically converted into the Company’s common stock.

The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data):



	Year Ended January 31,
	2020						2019						2018
	Class A			Class B			Class A			Class B			Class A			Class B
Numerator:
Net loss	$	(192,138	)	$	(16,775	)	$	(107,926	)	$	(17,571	)	$	(31,980	)	$	(77,869	)
Denominator:
Weighted-average shares outstanding, basic and diluted	107,809			9,412			92,452			15,052			24,165			58,839
Net loss per share, basic and diluted	$	(1.78	)	$	(1.78	)	$	(1.17	)	$	(1.17	)	$	(1.32	)	$	(1.32	)

As the Company was in a loss position for all periods presented, basic net loss per share is the same as diluted net loss per share as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands):



	Year Ended January 31,
	2020	2019	2018
Issued and outstanding stock options	12,359	17,804	24,917
Unvested RSUs issued and outstanding	4,893	4,836	2,863
Unvested restricted stock awards issued and outstanding	177	388	599
Unvested shares subject to repurchase	5	48	188
Unvested restricted common stock issued and outstanding	—	400	800
Shares committed under the ESPP	253	271	1,149
Shares related to 2023 convertible senior notes	2,494	7,134	—
Shares subject to warrants related to the issuance of 2023 convertible senior notes	2,494	—	—
Shares related to 2025 convertible senior notes	5,617	—	—
	28,292	30,881	30,516

The Company uses the if-converted method for calculating any potential dilutive effect of the conversion options embedded in the Notes on diluted net income per share, if applicable. The conversion options of the 2023 and 2025 Notes and exercise rights of the Warrants will have a dilutive impact on net income per share of common stock when the average market price per share of the Company’s Class A common stock for a given period exceeds the conversion prices of $48.36 per share, $188.71 per share and exercise price of $68.06 per share, respectively. During the year ended January 31, 2020, the weighted average price per share of the Company’s Class A common stock exceeded the conversion price of the 2023 Notes and the exercise price of the Warrants; however, since the Company was in a net loss position there was no dilutive effect during any period presented.

Subsequent Events	12 Months Ended
Subsequent Events	Jan. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:174%;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;font-weight:bold;">Subsequent Events </font></div><div style="line-height:174%;padding-bottom:12px;text-indent:36px;font-size:10pt;"><font style="font-family:Arial;font-size:10pt;background-color:#ffff00;">[None]. [to remove subsequent events note if none at reporting]</font></div></div>

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Jan. 31, 2020

Accounting Policies [Abstract]

Basis of Presentation

The accompanying consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP).

Principles of Consolidation

All intercompany balances and transactions have been eliminated in consolidation.

Certain reclassifications of prior period amounts have been made in our consolidated balance sheets and consolidated statement of cash flows to conform to the current period presentation. We reclassified $14.8 million of certain accrued accounts payable to accrued expenses as of January 31, 2019. These reclassifications had no impact on net loss, stockholders’ equity or cash flows as previously reported.

Fiscal Period

The Company’s fiscal year ends on January 31. References to fiscal 2020, for example, refer to the fiscal year ended January 31, 2020.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and on other assumptions that its management believes are reasonable under the circumstances. Actual results could vary from those estimates. The Company’s most significant estimates include the stand alone selling price (SSP) for each distinct performance obligation included in customer contracts with multiple performance obligations, the determination of the period of benefit for deferred commissions, the determination of the effective interest rate of the liability components of our convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation of deferred income tax assets and the valuation of acquired intangible assets.

Foreign Currency

The functional currencies of the Company’s foreign subsidiaries are the respective local currencies. Translation adjustments arising from the use of differing exchange rates from period to period are included in accumulated other comprehensive loss within the consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit). Foreign currency transaction gains and losses are included in other expense, net in the consolidated statements of operations and were not material for the years ended January 31, 2020, 2019 or 2018. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenue and expenses are translated at the average exchange rate during the period, and equity balances are translated using historical exchange rates.

Segment Information

Revenue Recognition, Cost of Revenue and Deferred Revenue

The Company determines revenue recognition through the following steps:


•	Identification of the contract, or contracts, with a customer;


•	Identification of the performance obligations in the contract;


•	Determination of the transaction price;


•	Allocation of the transaction price to the performance obligations in the contract; and


•	Recognition of revenue when, or as, the Company satisfies a performance obligation.

Subscription Revenue

Professional Services Revenue

Contracts with Multiple Performance Obligations

The Company primarily invoices its customers for its subscription services arrangements annually in advance. The Company’s payment terms generally provide that customers pay the invoiced portion of the total arrangement fee within 30 days of the invoice date. Amounts anticipated to be recognized within one year of the balance sheet date are recorded as deferred revenue, current; the remaining portion is recorded as deferred revenue, noncurrent in the consolidated balance sheets.

Deferred Commissions

the related contract renewal term. Amortization expense is included in sales and marketing expenses in the accompanying consolidated statements of operations.

Cash and Cash Equivalents

Short-term Investments

Accounts Receivable and Allowances

Property and Equipment

The useful lives of property and equipment are as follows:



	Useful lives
Capitalized internal-use software costs	3 years
Computers and equipment	3 years
Furniture and fixtures	7 years
Leasehold improvements	Shorter of estimated useful life or remaining lease term

Business Combinations

Goodwill and Other Long-Lived Assets

The Company amortizes intangible assets with finite lives on a straight-line basis over their estimated useful lives in cost of revenue in the consolidated statements of operations.

Convertible Senior Notes

Advertising Expenses

Advertising costs are expensed as incurred.

Income Taxes

allowance against its deferred tax assets. Realization of its deferred tax assets is dependent primarily upon future U.S. taxable income.

The Company recognizes and measures tax benefits from uncertain tax positions using a two-step approach.

Facility Leases

Concentrations of Risk and Significant Customers

Other than the United States, no individual country exceeded 10% of total revenue for the years ended January 31, 2020, 2019 and 2018.

Net Loss per Share

Recently Adopted and Not Yet Adopted Accounting Pronouncements

Fair Value Measurement

Three levels of inputs may be used to measure as follows:

Level 1-Valuations based on observable inputs that reflect quoted prices for identical assets or liabilities in

active markets.

Level 2-Valuations based on other inputs that are directly or indirectly observable in the marketplace.

Level 3-Valuations based on unobservable inputs that are supported by little or no market activity.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jan. 31, 2020

Accounting Policies [Abstract]

Schedule of Property Plant and Equipment Estimated Useful Life

The useful lives of property and equipment are as follows:



	Useful lives
Capitalized internal-use software costs	3 years
Computers and equipment	3 years
Furniture and fixtures	7 years
Leasehold improvements	Shorter of estimated useful life or remaining lease term

Property and equipment consisted of the following (in thousands):



	As of January 31,
	2020			2019
Computers and equipment	$	3,567		$	3,668
Furniture and fixtures	11,014			11,012
Leasehold improvements	55,363			47,883
Property and equipment, gross	69,944			62,563
Less accumulated depreciation	(16,409		)	(9,642		)
Property and equipment, net	$	53,535		$	52,921

Schedule of Revenue by Geographic Area

The following table sets forth revenue by geographic area (in thousands):



	Year Ended January 31,
	2020		2019		2018
United States	$	494,529	$	337,367	$	217,300
International	91,538		61,887		39,247
Total	$	586,067	$	399,254	$	256,547

Schedule of Impact of New Accounting Pronouncements

Select consolidated balance sheet line items, which reflect the adoption of ASC 842, are as follows (in thousands):



	As of January 31, 2019
	As Reported		Adoption of ASC 842			As Adjusted
Assets
Current assets:
Prepaid expenses and other current assets	$	29,451	$	(1,214	)	$	28,237
Total current assets	709,330		(1,214		)	708,116
Operating lease right-of-use assets	—		121,389			121,389
Other noncurrent assets	15,286		(197		)	15,089
Total assets	$	864,335	$	119,978		$	984,313

Liabilities and stockholders’ equity
Current liabilities:
Accrued expenses and other liabilities	$	24,740	$	8,913		$	33,653
Total current liabilities	564,191		8,913			573,104
Operating lease liabilities, noncurrent	—		147,046			147,046
Other noncurrent liabilities	38,999		(35,981		)	3,018
Total liabilities	611,958		119,978			731,936
Total liabilities and stockholders’ equity	$	864,335	$	119,978		$	984,313

Cash Equivalents and Short-term Investments (Tables)

12 Months Ended

Jan. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments

The amortized cost, unrealized gain (loss) and estimated fair value of the Company’s cash equivalents and short-term investments as of January 31, 2020 and 2019 were as follows (in thousands):



	As of January 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	416,584	$	—	$	—		$	416,584
U.S. treasury securities	19,996		—		—			19,996
Total cash equivalents	436,580		—		—			436,580
Short-term investments:
U.S. treasury securities	575,920		686		(8		)	576,598
Corporate debt securities	305,859		519		—			306,378
Total short-term investments	881,779		1,205		(8		)	882,976
Total	$	1,318,359	$	1,205	$	(8	)	$	1,319,556



	As of January 31, 2019
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	247,426	$	—	$	—		$	247,426
Corporate debt securities	3,409		—		(1		)	3,408
Total cash equivalents	250,835		—		(1		)	250,834
Short-term investments:
U.S. treasury securities	195,913		37		(53		)	195,897
Corporate debt securities	69,483		13		(19		)	69,477
Total short-term investments	265,396		50		(72		)	265,374
Total	$	516,231	$	50	$	(73	)	$	516,208

Schedule of Contractual Maturities of Short-term Investments

The Company's short-term investments as of January 31, 2020 and 2019 all mature within one year, as follows (in thousands):



	As of January 31, 2020				As of January 31, 2019
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due within one year	$	881,779	$	882,976	$	265,396	$	265,374

Fair Value Measurements (Tables)

12 Months Ended

Jan. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents information about the Company’s financial assets that were measured at fair value on a recurring basis using the above input categories (in thousands):



	As of January 31, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	416,584	$	—	$	—	$	416,584
U.S. treasury securities	$	—	$	19,996	$	—	19,996
Total cash equivalents	416,584		19,996		—		436,580
Short-term investments:
U.S. treasury securities	—		576,598		—		576,598
Corporate debt securities	—		306,378		—		306,378
Total short-term investments	—		882,976		—		882,976
Total cash equivalents and short-term investments	$	416,584	$	902,972	$	—	$	1,319,556



	As of January 31, 2019
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	247,426	$	—	$	—	$	247,426
Corporate debt securities	—		3,408		—		3,408
Total cash equivalents	247,426		3,408		—		250,834
Short-term investments:
U.S. treasury securities	—		195,897		—		$	195,897
Corporate debt securities	—		69,477		—		69,477
Total short-term investments	—		265,374		—		265,374
Total cash equivalents and short-term investments	$	247,426	$	268,782	$	—	$	516,208

Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note

The following table presents the carrying amounts and estimated fair values of our financial instruments that are not recorded at fair value on the consolidated balance sheets (in thousands):



	As of January 31, 2020
	Net Carrying Amount⁽¹⁾		Estimated Fair Value
2023 Convertible senior notes	$	102,543	$	331,014
2025 Convertible senior notes	$	851,535	$	1,074,840

Goodwill and Intangible Assets, net (Tables)

12 Months Ended

Jan. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Goodwill balances as of January 31, 2020 and 2019 were as follows (in thousands):



	Goodwill
Balance at January 31, 2019	$	18,089
Goodwill recorded in connection with Azuqua acquisition	29,934
Balance at January 31, 2020	$	48,023

Schedule of Intangible Assets, net

Intangible assets consisted of the following (in thousands):



	As of January 31, 2020
	Gross		Accumulated Amortization			Write-offs			Net
Capitalized internal-use software costs	$	24,890	$	(14,828	)	$	(119	)	$	9,943
Purchased developed technology	28,800		(6,321		)	—			22,479
Software licenses	1,112		(1,005		)	—			107
	$	54,802	$	(22,154	)	$	(119	)	$	32,529



	As of January 31, 2019
	Gross		Accumulated Amortization			Write-offs		Net
Capitalized internal-use software costs	$	19,838	$	(9,969	)	$	—	$	9,869
Purchased developed technology	4,600		(833		)	—		3,767
Software licenses	1,023		(762		)	—		261
	$	25,461	$	(11,564	)	$	—	$	13,897

Schedule of Estimated Remaining Amortization Expense for Intangible Assets

As of January 31, 2020, estimated remaining amortization expense for the intangible assets by fiscal year was as follows (in thousands):



	Remaining Amortization
2021	11,300
2022	8,403
2023	6,586
2024	5,356
2025	884
Total	$	32,529

Balance Sheet Components (Tables)

12 Months Ended

Jan. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Property and Equipment, net

The useful lives of property and equipment are as follows:



	Useful lives
Capitalized internal-use software costs	3 years
Computers and equipment	3 years
Furniture and fixtures	7 years
Leasehold improvements	Shorter of estimated useful life or remaining lease term

Property and equipment consisted of the following (in thousands):



	As of January 31,
	2020			2019
Computers and equipment	$	3,567		$	3,668
Furniture and fixtures	11,014			11,012
Leasehold improvements	55,363			47,883
Property and equipment, gross	69,944			62,563
Less accumulated depreciation	(16,409		)	(9,642		)
Property and equipment, net	$	53,535		$	52,921

Schedule of Allowances

The Company’s accounts receivable allowances for the years ended January 31, 2020, 2019 and 2018 were as follows (in thousands):



	As of January 31,
	2020			2019			2018
Balance, beginning of period	$	2,098		$	1,472		$	1,306
(Reductions) additions	(673		)	888			431
Write-offs	(259		)	(262		)	(265		)
Balance, end of period	$	1,166		$	2,098		$	1,472

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):



	As of January 31,
	2020		2019⁽¹⁾
Accrued expenses	22,530		21,174
Accrued taxes payable	1,591		1,195
Operating lease liabilities	12,064		10,914
Other	702		370
Accrued expenses and other current liabilities	$	36,887	$	33,653

Schedule of Other Liabilities, noncurrent

Other liabilities, noncurrent consisted of the following (in thousands):



	As of January 31,
	2020		2019⁽¹⁾
Deferred tax liabilities	$	1,558	$	727
Other	3,803		2,291
Other liabilities, noncurrent	$	5,361	$	3,018

Convertible Senior Notes, Net (Tables)

12 Months Ended

Jan. 31, 2020

Debt Disclosure [Abstract]

Schedule of Interest Expense

The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands):



	Year Ended January 31, 2020
Contractual interest expense	$	519
Amortization of debt issuance costs	769
Amortization of debt discount	12,919
Total	$	14,207

he following table sets forth total interest expense recognized related to the 2023 Notes (in thousands):



	Year Ended January 31,
	2020		2019
Contractual interest expense	$	606	$	793
Amortization of debt issuance costs	985		1,085
Amortization of debt discount	11,219		13,194
Total	$	12,810	$	15,072

Schedule of Liability and Equity Component of 2023 Notes

The 2023 Notes, net consisted of the following (in thousands):



	As of January 31, 2020
Liability component:
Principal	$	120,588
Less: unamortized debt issuance costs and debt discount	(19,885		)
Net carrying amount	$	100,703

Equity component:
2023 Notes	$	27,949
Less: issuance costs	(811		)
Carrying amount of the equity component⁽¹⁾	$	27,138

⁽¹⁾Included in the consolidated balance sheets within Additional paid-in capital.

The 2025 Notes, net consisted of the following (in thousands):



	As of January 31, 2020
Liability component:
Principal	$	1,060,000
Less: unamortized debt issuance costs and debt discount	(222,998		)
Net carrying amount	$	837,002

Equity component:
2025 Notes	$	221,387
Less: issuance costs	(4,040		)
Carrying amount of the equity component⁽¹⁾	$	217,347

Leases (Tables)

12 Months Ended

Jan. 31, 2020

Leases [Abstract]

Schedule of Operating Lease Costs

Operating lease costs were as follows (in thousands):



	Year Ended January 31,
	2020		2019		2018
Operating lease costs⁽¹⁾	$	23,193	$	23,290	$	10,588

⁽¹⁾Amounts are presented exclusive of sublease income and include short-term leases, which are immaterial.

Schedule of Maturities of Operating Leases

Maturities of the Company’s operating lease liabilities, which do not include short-term leases, as of January 31, 2020 were as follows (in thousands):



	Operating Leases
2021	$	21,225
2022	27,512
2023	27,532
2024	28,110
2025	25,768
Thereafter	81,209
Total lease payments	211,356
Less imputed interest	(44,781		)
Total operating lease liabilities	$	166,575

Commitments and Contingencies (Tables)

12 Months Ended

Jan. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

As of January 31, 2020, future minimum purchase obligations, such as data center operations and sales and marketing activities, were as follows (in thousands):



	Purchase Obligations
2021	$	56,413
2022	39,110
2023	30,398
2024	30,000
Total contractual obligations	$	155,921

Schedule of Purchase Obligations Fiscal Maturity Schedule

As of January 31, 2020, future minimum purchase obligations, such as data center operations and sales and marketing activities, were as follows (in thousands):



	Purchase Obligations
2021	$	56,413
2022	39,110
2023	30,398
2024	30,000
Total contractual obligations	$	155,921

Common Stock and Stockholders' Equity (Tables)

12 Months Ended

Jan. 31, 2020

Equity [Abstract]

Schedule of Common Stock Reserved for Future Issuance

As of January 31, 2020, shares of common stock reserved for future issuance were as follows:



	As of January 31, 2020
Options and unvested RSUs outstanding	17,252,543
Available for future stock option and RSU grants	16,456,003
Available for ESPP	3,653,857
	37,362,403

Employee Incentive Plans (Tables)

12 Months Ended

Jan. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation Expense by Award Type

Stock-based compensation expense by award type was as follows (in thousands):



	Year Ended January 31,
	2020		2019		2018
Stock options	$	21,888	$	23,466	$	24,186
RSUs	94,637		41,637		9,104
ESPP	9,408		7,248		7,111
Restricted stock awards	590		1,608		3,281
Restricted common stock	101		2,361		6,178
Total	$	126,624	$	76,320	$	49,860

Schedule of Stock-based Compensation Expense by Statement of Operations Location

Stock-based compensation expense was recorded in the following cost and expense categories in the Company’s consolidated statements of operations (in thousands):



	Year Ended January 31,
	2020		2019		2018
Cost of revenue:
Subscription	$	12,923	$	7,837	$	4,600
Professional services and other	7,164		4,983		3,137
Research and development	37,683		22,642		18,107
Sales and marketing	38,077		22,916		13,242
General and administrative	30,777		17,942		10,774
Total	$	126,624	$	76,320	$	49,860

Schedule of Stock Option Activity

A summary of the Company’s stock option activity and related information was as follows:



	Number of Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 2019	17,803,794		$	9.16	7.1	$	1,304,446
Granted	415,547		82.33
Exercised	(5,422,281	)	8.37
Canceled	(437,758	)	13.35
Outstanding as of January 31, 2020	12,359,302		$	11.82	6.2	$	1,436,487
As of January 31, 2020:
Vested and expected to vest	12,359,302		$	11.82	6.2	$	1,436,487
Vested and exercisable	8,723,638		$	8.16	5.9	$	1,045,852

Schedule of Black-Scholes Option Pricing Model Estimated Fair Value Assumptions

The Company used the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions:



	Year Ended January 31,
	2020		2019		2018
Expected volatility	43	%	40	%	40% - 41%
Expected term (in years)	6.3		6.3		6.3 - 6.4
Risk-free interest rate	1.55% - 2.27%		2.70	%	1.87% - 2.21%
Expected dividend yield	—		—		—

Schedule of Nonvested Restricted Stock Units Activity

A summary of the Company’s RSU activities and related information is as follows:



	Number of RSUs		Weighted- Average Grant Date Fair Value Per Share
Outstanding as of January 31, 2019	4,835,536		$	44.49
Granted	2,458,095		114.07
Vested	(1,752,333	)	44.69
Forfeited	(648,057	)	54.94
Outstanding as of January 31, 2020	4,893,241		$	77.99

Schedule of ESPP Black-Scholes Option Pricing Model Estimated Fair Value Assumptions

The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:



	Year Ended January 31,
	2020	2019	2018
Expected volatility	43% - 59%	39% - 70%	32% - 38%
Expected term (in years)	0.5 - 1.0	0.5 - 1.0	0.5 - 1.2
Risk-free interest rate	1.53% - 2.05%	2.12% - 2.62%	0.95% - 1.73%
Expected dividend yield	—	—	—

Income Taxes (Tables)

12 Months Ended

Jan. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Domestic and Foreign Components of Pre-tax Loss

The domestic and foreign components of pre-tax loss for the years ended January 31, 2020, 2019 and 2018 were as follows (in thousands):



	Year Ended January 31,
	2020			2019			2018
Domestic	$	(220,846	)	$	(128,214	)	$	(112,858	)
Foreign	10,514			2,700			2,688
Loss before benefit from income taxes	$	(210,332	)	$	(125,514	)	$	(110,170	)

Schedule of Components of Provision for (Benefit from) Income Taxes

The components of the benefit from income taxes for the years ended January 31, 2020, 2019 and 2018 were as follows (in thousands):



	Year Ended January 31,
	2020			2019			2018
Current:
Federal	$	33		$	—		$	—
State	86			61			—
Foreign	822			667			183
Total current provision for income taxes	941			728			183
Deferred:
Federal	(518		)	(620		)	(32		)
State	(406		)	(130		)	10
Foreign	(1,436		)	5			(482		)
Total deferred benefit from income taxes	(2,360		)	(745		)	(504		)
Total benefit from income taxes	$	(1,419	)	$	(17	)	$	(321	)

Schedule of Effective Income Tax Rate Reconciliation

The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended January 31, 2020, 2019 and 2018:



	Year Ended January 31,
	2020		2019		2018
Tax at federal statutory rate	21.0	%	21.0	%	33.8	%
State income taxes, net of federal benefit	4.0		3.8		3.4
Change in valuation allowance	(100.1	)	(68.5	)	(27.1	)
Stock-based compensation	59.8		45.5		42.4
Research and development credits	18.0		—		—
Tax Cuts and Jobs Act of 2017	—		—		(51.3	)
Other, net	(2.0	)	(1.8	)	(0.9	)
Effective tax rate	0.7	%	—	%	0.3	%

Schedule of Deferred Tax Assets and Liabilities

The tax effects of temporary differences and related deferred tax assets and liabilities as of January 31, 2020 and 2019 were as follows (in thousands):



	As of January 31,
	2020			2019
				As Adjusted⁽¹⁾
Deferred tax assets:
Net operating loss carryforwards	$	370,705		$	202,471
Stock-based compensation	18,680			13,185
Deferred revenue	1,960			1,312
Operating lease liabilities	42,073			39,060
Other reserves and accruals	6,414			3,750
Research and development and other credits	39,918			791
Convertible debt	—			477
Disallowed interest	4,507			1,292
Total deferred tax assets	484,257			262,338
Valuation allowance	(361,606		)	(203,899		)
Total deferred tax assets, net	122,651			58,439
Deferred tax liabilities:
Convertible debt	(50,963		)	—
Deferred commissions	(27,569		)	(19,424		)
Capitalized internal-use software costs	(2,248		)	(2,047		)
Goodwill	(262		)	(217		)
Operating lease right-of-use assets	(31,165		)	(29,697		)
Depreciation and amortization	(8,315		)	(6,492		)
Total deferred tax liabilities	(120,522		)	(57,877		)
Net deferred tax assets	$	2,129		$	562

⁽¹⁾

Adjusted for adoption of ASC 842. See Note 2.

Schedule of Unrecognized Tax Benefits Roll Forward

A reconciliation of beginning and ending amount of unrecognized tax benefit was as follows (in thousands):



	Year Ended January 31,
	2020			2019		2018
Gross amount of unrecognized tax benefits as of the beginning of the year	$	23,931		$	11,719	$	5,775
Additions based on tax positions related to a prior year	658			1,859		—
Additions based on tax positions related to current year	6,866			10,353		5,944
Reductions based on tax positions related to current year	—			—		—
Reductions based on tax positions taken in a prior year	(15,468		)	—		—
Gross amount of unrecognized tax benefits as of the end of the year	$	15,987		$	23,931	$	11,719

Net Loss Per Share (Tables)

12 Months Ended

Jan. 31, 2020

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Share

The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data):



	Year Ended January 31,
	2020						2019						2018
	Class A			Class B			Class A			Class B			Class A			Class B
Numerator:
Net loss	$	(192,138	)	$	(16,775	)	$	(107,926	)	$	(17,571	)	$	(31,980	)	$	(77,869	)
Denominator:
Weighted-average shares outstanding, basic and diluted	107,809			9,412			92,452			15,052			24,165			58,839
Net loss per share, basic and diluted	$	(1.78	)	$	(1.78	)	$	(1.17	)	$	(1.17	)	$	(1.32	)	$	(1.32	)

Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Per Share

Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands):



	Year Ended January 31,
	2020	2019	2018
Issued and outstanding stock options	12,359	17,804	24,917
Unvested RSUs issued and outstanding	4,893	4,836	2,863
Unvested restricted stock awards issued and outstanding	177	388	599
Unvested shares subject to repurchase	5	48	188
Unvested restricted common stock issued and outstanding	—	400	800
Shares committed under the ESPP	253	271	1,149
Shares related to 2023 convertible senior notes	2,494	7,134	—
Shares subject to warrants related to the issuance of 2023 convertible senior notes	2,494	—	—
Shares related to 2025 convertible senior notes	5,617	—	—
	28,292	30,881	30,516

Overview and Basis of Presentation Narrative (Details) $ in Millions	Jan. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other Accrued Liabilities	$ 14.8

Summary of Significant Accounting Policies Narrative (Details) - USD ($)

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

Sep. 01, 2019

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Other Accrued Liabilities

$ 14,800,000

Share Price

$ 128.05

Payment terms for deferred revenue

30 days

Amortization period for capitalized contract costs

5 years

Commissions capitalized as contract costs

$ 61,300,000

41,300,000

Amortization of contract costs

28,600,000

20,900,000

$ 15,200,000

Impairment loss related to costs capitalized

Noncurrent portion of restricted cash

11,400,000

Advertising expenses

17,000,000.0

10,000,000.0

$ 9,400,000

Operating lease liability

125,204,000

$ 121,389,000

^[1]

$ 166,575,000

ESPP

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Expected dividend yield

0.00%

Capitalized internal-use software costs

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Intangible asset, useful life

3 years

Minimum

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Contract duration

1 year

Maximum

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Contract duration

5 years

Senior Notes | Convertible Senior Notes Due 2025

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Aggregate principal amount

$ 1,060,000,000.0

Fixed interest rate

0.125%

[1]	Adjusted for adoption of ASC 842. See Note 2.

Summary of Significant Accounting Policies Schedule of Estimated Useful Lives (Details)	12 Months Ended
	Jan. 31, 2020
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Capitalized internal-use software costs
Property, Plant and Equipment [Line Items]
Intangible asset, useful life	3 years

Summary of Significant Accounting Policies Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 586,067	$ 399,254	$ 256,547
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	494,529	337,367	217,300
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 91,538	$ 61,887	$ 39,247

Summary of Significant Accounting Policies Schedule of Impact of New Accounting Pronouncements (Details) - USD ($)
$ in Thousands

Jan. 31, 2020

Jan. 31, 2019

$ 32,950

$ 28,237

^[1]

1,599,725

708,116

^[1]

125,204

121,389

^[1]

Other noncurrent assets

18,505

15,089

^[1]

Liabilities and stockholders’ equity

1,955,395

984,313

^[1]

36,887

33,653

^[1]

546,963

573,104

^[1]

Other noncurrent liabilities

154,511

147,046

^[1]

5,361

3,018

^[1]

1,550,051

731,936

^[1]

$ 1,955,395

984,313

^[1]

As Reported

29,451

709,330

Other noncurrent assets

15,286

Liabilities and stockholders’ equity

864,335

24,740

564,191

Other noncurrent liabilities

38,999

611,958

864,335

Adoption of ASC 842

(1,214)

(1,214)

121,389

Other noncurrent assets

(197)

Liabilities and stockholders’ equity

119,978

8,913

8,913

Other noncurrent liabilities

147,046

(35,981)

119,978

$ 119,978

[1]	Adjusted for adoption of ASC 842. See Note 2.

Business Combinations - Narrative (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

12 Months Ended

Mar. 18, 2019

Jul. 13, 2018

Apr. 30, 2019

Jul. 31, 2018

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

^[1]

Payments for business acquisition, net of cash acquired

$ 44,283

$ 15,632

^[1]

$ 0

24,200

48,023

$ 18,089

^[2]

Azuqua, Inc.

Payments for business acquisition, net of cash acquired

$ 44,200

Cash received from acquisition

1,100

15,700

Acquisition related costs

29,900

$ 3,000

Azuqua, Inc. | Purchased developed technology

$ 15,700

ScaleFT, Inc.

Payments for business acquisition, net of cash acquired

$ 15,600

Cash received from acquisition

600

Acquisition related costs

11,800

$ 1,100

ScaleFT, Inc. | Purchased developed technology

ScaleFT, Inc And Azuqua, Inc. [Member]

$ 4,600

Deferred compensation liability, noncurrent

10,800

Compensation expense

4,400

Remaining deferred compensation balance

$ 4,800

Future weighted-average period

1 year 7 months 6 days

[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

Cash Equivalents and Short-term Investments Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost	$ 881,779	$ 265,396
Unrealized Gain	1,205	50
Unrealized Loss	(8)	(72)
Estimated Fair Value	882,976	265,374
Total Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost	1,318,359	516,231
Unrealized Gain	1,205	50
Unrealized Loss	(8)	(73)
Estimated Fair Value	1,319,556	516,208
U.S. treasury securities
Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost	575,920	195,913
Unrealized Gain	686	37
Unrealized Loss	(8)	(53)
Estimated Fair Value	576,598	195,897
Corporate debt securities
Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost	305,859	69,483
Unrealized Gain	519	13
Unrealized Loss	0	(19)
Estimated Fair Value	306,378	69,477
Cash and Cash Equivalents
Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost	436,580	250,835
Unrealized Gain	0	0
Unrealized Loss	0	(1)
Estimated Fair Value	436,580	250,834
Cash and Cash Equivalents \| Money market funds
Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost	416,584	247,426
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	416,584	247,426
Cash and Cash Equivalents \| U.S. treasury securities
Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost	19,996
Unrealized Gain	0
Unrealized Loss	0
Estimated Fair Value	$ 19,996
Cash and Cash Equivalents \| Corporate debt securities
Cash Equivalents And Short Term Investments [Abstract]
Amortized Cost		3,409
Unrealized Gain		0
Unrealized Loss		(1)
Estimated Fair Value		$ 3,408

Cash Equivalents and Short-term Investments Schedule of Contractual Maturities of Short-term Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Amortized Cost
Amortized cost, due within one year	$ 881,779	$ 265,396
Estimated Fair Value
Estimated fair value, due within one year	$ 882,976	$ 265,374

Cash Equivalents and Short-term Investments Narrative (Details)	12 Months Ended
	Jan. 31, 2020 USD ($) investment	Jan. 31, 2019 USD ($) investment	Jan. 31, 2018 USD ($)
Investments, Debt and Equity Securities [Abstract]
Number of short-term investments in unrealized loss positions \| investment	7	34
Gross unrealized gains or losses from available-for-sale securities	$ 0	$ 0	$ 0
Realized gains or losses reclassified out of accumulated other comprehensive income	0	0	$ 0
Other-than-temporary impairment short term investment	$ 0	$ 0

Fair Value Measurements Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Assets:
Cash equivalents, fair value	$ 436,580	$ 250,834
Short term investments, fair value	882,976	265,374
Total cash equivalents and short-term investments	1,319,556	516,208
Level 1
Assets:
Cash equivalents, fair value	416,584	247,426
Short term investments, fair value	0	0
Total cash equivalents and short-term investments	416,584	247,426
Level 2
Assets:
Cash equivalents, fair value	19,996	3,408
Short term investments, fair value	882,976	265,374
Total cash equivalents and short-term investments	902,972	268,782
Level 3
Assets:
Cash equivalents, fair value	0	0
Short term investments, fair value	0	0
Total cash equivalents and short-term investments	0	0
U.S. treasury securities
Assets:
Short term investments, fair value	576,598	195,897
U.S. treasury securities \| Level 1
Assets:
Short term investments, fair value	0	0
U.S. treasury securities \| Level 2
Assets:
Short term investments, fair value	576,598	195,897
U.S. treasury securities \| Level 3
Assets:
Short term investments, fair value	0	0
Corporate debt securities
Assets:
Short term investments, fair value	306,378	69,477
Corporate debt securities \| Level 1
Assets:
Short term investments, fair value	0	0
Corporate debt securities \| Level 2
Assets:
Short term investments, fair value	306,378	69,477
Corporate debt securities \| Level 3
Assets:
Short term investments, fair value	0	0
Money market funds
Assets:
Cash equivalents, fair value	416,584	247,426
Money market funds \| Level 1
Assets:
Cash equivalents, fair value	416,584	247,426
Money market funds \| Level 2
Assets:
Cash equivalents, fair value	0	0
Money market funds \| Level 3
Assets:
Cash equivalents, fair value	0	0
U.S. treasury securities
Assets:
Cash equivalents, fair value	19,996
U.S. treasury securities \| Level 1
Assets:
Cash equivalents, fair value	0
U.S. treasury securities \| Level 2
Assets:
Cash equivalents, fair value	19,996
U.S. treasury securities \| Level 3
Assets:
Cash equivalents, fair value	$ 0
Corporate debt securities
Assets:
Cash equivalents, fair value		3,408
Corporate debt securities \| Level 1
Assets:
Cash equivalents, fair value		0
Corporate debt securities \| Level 2
Assets:
Cash equivalents, fair value		3,408
Corporate debt securities \| Level 3
Assets:
Cash equivalents, fair value		$ 0

Fair Value Measurements Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note (Details) - Senior Notes $ in Thousands	Jan. 31, 2020 USD ($)
Net Carrying Amount \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Convertible senior notes value	$ 102,543
Net Carrying Amount \| Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Convertible senior notes value	851,535
Estimated Fair Value \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Convertible senior notes value	331,014
Estimated Fair Value \| Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Convertible senior notes value	$ 1,074,840

Fair Value Measurements Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Debt Instrument [Line Items]
Closing price of common stock (in dollars per share)	$ 128.05
Convertible Senior Notes Due 2023 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 120,588	$ 345,000

Goodwill and Intangible Assets, net Narrative (Details) - USD ($)

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

Mar. 18, 2019

Stock-based compensation included in capitalized software costs

$ 48,023,000

$ 18,089,000

^[1]

Goodwill impairments

$ 0

1,200,000

500,000

Amortization expense

10,600,000

5,800,000

2,900,000

Company wrote-off an immaterial amount

119,000

$ 0

^[2]

1,114,000

^[2]

Weighted average useful life

$ 24,200,000

3 years 10 months 24 days

2 years 6 months

Capitalized internal-use software costs

Capitalized internal-use software

$ 5,100,000

$ 3,400,000

Amortization expense

4,900,000

4,800,000

$ 2,700,000

Company wrote-off an immaterial amount

119,000

Company wrote-off an immaterial amount

$ 0

Finite-lived Intangible Assets Acquired

8,500,000

Azuqua, Inc.

Goodwill recorded in connection with Azuqua acquisition

$ 29,900,000

29,934,000

Azuqua, Inc. | Purchased developed technology

$ 15,700,000

Balance at January 31, 2019

$ 15,700,000

[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

Goodwill and Intangible Assets, net Schedule of Goodwill (Details)
$ in Thousands

12 Months Ended

Jan. 31, 2020

USD ($)

Goodwill [Roll Forward]

$ 18,089

^[1]

Balance at January 31, 2020

$ 48,023

[1]	Adjusted for adoption of ASC 842. See Note 2.

Goodwill and Intangible Assets, net Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

^[1]

$ 54,802

$ 25,461

(22,154)

(11,564)

(119)

^[1]

$ (1,114)

Capitalized internal-use software costs

32,529

13,897

24,890

19,838

(14,828)

(9,969)

(119)

9,943

9,869

28,800

4,600

(6,321)

(833)

22,479

3,767

Software licenses

1,112

1,023

(1,005)

(762)

$ 107

$ 261

[1]	Adjusted for adoption of ASC 842. See Note 2.

Goodwill and Intangible Assets, net Remaining Amortization Expense (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
2021	$ 11,300
2022	8,403
2023	6,586
2024	5,356
2025	884
Total	$ 32,529	$ 13,897

Balance Sheet Components Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

Less accumulated depreciation

$ 69,944

$ 62,563

(16,409)

(9,642)

Property and equipment, net

53,535

52,921

^[1]

Depreciation expense

8,800

5,700

$ 4,000

Computers and equipment

3,567

3,668

Furniture and fixtures

11,014

11,012

Leasehold improvements

Organization, Consolidation and Presentation of Financial Statements [Abstract]

$ 55,363

$ 47,883

[1]	Adjusted for adoption of ASC 842. See Note 2.

Balance Sheet Components Schedule of Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance, beginning of period	$ 2,098	$ 1,472	$ 1,306
(Reductions) additions	(673)	888	431
Write-offs	(259)	(262)	(265)
Balance, end of period	$ 1,166	$ 2,098	$ 1,472

Balance Sheet Components Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands

Jan. 31, 2020

Jan. 31, 2019

Accrued expenses

$ 22,530

$ 21,174

Accrued taxes payable

1,591

1,195

Operating lease liabilities

12,064

10,914

Other

702

370

Accrued expenses and other current liabilities

$ 36,887

$ 33,653

^[1]

[1]	Adjusted for adoption of ASC 842. See Note 2.

Balance Sheet Components Schedule of Other Liabilities, Noncurrent (Details) - USD ($)
$ in Thousands

Jan. 31, 2020

Jan. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Deferred tax liabilities

$ 1,558

$ 727

Other

3,803

2,291

Other liabilities, noncurrent

$ 5,361

$ 3,018

^[1]

[1]	Adjusted for adoption of ASC 842. See Note 2.

Deferred Revenue and Performance Obligations Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue recognized that was included in the contract liability balance	$ 241.1	$ 157.9
Unbilled receivables	$ 1.0	$ 1.5

Deferred Revenue and Performance Obligations Performance Obligations (Details) $ in Millions	Jan. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue from remaining performance obligations	$ 1,209.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-02-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, expected timing	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-08-01
Revenue from Contract with Customer [Abstract]
Revenue from remaining performance obligations	$ 592.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	49.00%

Convertible Senior Notes, Net - Convertible Senior Notes (Details)
$ / shares in Units, $ in Thousands, shares in Millions

1 Months Ended

3 Months Ended

12 Months Ended

Feb. 23, 2018

day

Sep. 30, 2019

USD ($)

Feb. 28, 2018

USD ($)

day

$ / shares

Jan. 31, 2020

USD ($)

day

$ / shares

Jan. 31, 2020

USD ($)

day

$ / shares

Jan. 31, 2019

USD ($)

^[1]

Jan. 31, 2018

USD ($)

^[1]

Oct. 31, 2019

USD ($)

Sep. 01, 2019

Limitation on sale of common stock, sale price threshold, number of trading days | day

Gain (Loss) on extinguishment of debt

$ (14,572)

$ 0

Senior Notes | Convertible Senior Notes Due 2023

Repayments of Long-term Debt

Fixed interest rate

0.25%

Net proceeds from notes

$ 335,000

$ 224,400

Initial conversion rate of common stock

0.0206795

20.6795

Debt issuance costs

$ 3,800

$ 10,000

Principal remains outstanding

$ 120,588

$ 345,000

Conversion price (in dollars per share) | $ / shares

$ 48.36

Limitation on sale of common stock, sale price threshold, number of trading days | day

Limitation on sale of common stock, sale price threshold, trading period | day

Threshold percentage of stock price trigger

130.00%

Number of consecutive business days

5 days

Percentage of closing sale price in excess of convertible notes

98.00%

Redemption price percentage

100.00%

Effective interest rate

4.00%

5.68%

Issuance costs attributable to liability component

7,700

$ 7,700

Debt Instrument, Repurchase Amount

$ 604,800

Debt Instrument, Repurchase Amount, Portion Allocated to to Debt Component

197,700

Debt Instrument, Repurchase Amount. Portion Allocated to Equity Component

407,100

Aggregate principal amount

183,100

Gain (Loss) on extinguishment of debt

$ (14,600)

Senior Notes | Convertible Senior Notes Due 2025

Initial conversion rate of common stock

Fixed interest rate

0.125%

5.2991

Debt issuance costs

19,300

$ 19,300

Principal remains outstanding

$ 1,060,000

Conversion price (in dollars per share) | $ / shares

$ 188.71

Limitation on sale of common stock, sale price threshold, trading period | day

Percentage of closing sale price in excess of convertible notes

98.00%

Redemption price percentage

130.00%

100.00%

Effective interest rate

4.10%

Issuance costs attributable to liability component

$ 15,300

Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2023

Debt Issuance Costs, Equity Component, Gross

Less: issuance costs

811

2,300

Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2025

Class A Common Stock | Senior Notes | Convertible Senior Notes Due 2023

Less: issuance costs

$ 4,040

Stock issued during the period (in shares) | shares

3.0

[1]	Adjusted for adoption of ASC 842. See Note 2.

Convertible Senior Notes, Net - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Debt Instrument [Line Items]
Total	$ 14,207
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	606	$ 793
Amortization of debt issuance costs	985	1,085
Amortization of debt discount	11,219	13,194
Total	12,810	$ 15,072
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	519
Amortization of debt issuance costs	769
Amortization of debt discount	$ 12,919

Convertible Senior Notes, Net - Schedule of Liability and Equity Component of 2023 and 2025 Notes (Details) - Senior Notes - USD ($) $ in Thousands	Jan. 31, 2020	Oct. 31, 2019
Convertible Senior Notes Due 2023
Liability component:
Principal	$ 120,588	$ 345,000
Less: unamortized debt issuance costs and debt discount	(19,885)
Net carrying amount	100,703
Convertible Senior Notes Due 2025
Liability component:
Principal	1,060,000
Less: unamortized debt issuance costs and debt discount	(222,998)
Net carrying amount	837,002
Additional Paid-in Capital \| Convertible Senior Notes Due 2023
Equity component:
Notes	27,949
Less: issuance costs	(811)
Carrying amount of the equity component	27,138
Additional Paid-in Capital \| Convertible Senior Notes Due 2025
Equity component:
Notes	221,387
Less: issuance costs	(4,040)
Carrying amount of the equity component	$ 217,347

Convertible Senior Notes, Net - Note Hedges and Warrants (Details)
$ / shares in Units, shares in Thousands, $ in Thousands

1 Months Ended

3 Months Ended

12 Months Ended

Feb. 23, 2018

day

Sep. 30, 2019

USD ($)

Feb. 28, 2018

USD ($)

day

$ / shares

Jan. 31, 2020

USD ($)

day

$ / shares

Jan. 31, 2020

USD ($)

day

$ / shares

Jan. 31, 2019

USD ($)

Jan. 31, 2018

USD ($)

Sep. 01, 2019

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares

28,292

30,881

30,516

Proceeds from Termination of Note Hedges

$ 405,851

Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares

7,100

Proceeds from issuance of warrants related to 2023 convertible senior notes

$ 52,440

^[1]

$ 0

^[1]

Payments for Repurchase of Warrants

358,622

^[1]

Payment for Capped Call, Convertible Debt

$ 74,094

$ 0

^[1]

$ 0

^[1]

Convertible Senior Notes Due 2023

Shares issuable under warrants granted (in shares) | shares

4,600

Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares

2,500

Per share value, shares issuable under warrants granted (in dollars per share) | $ / shares

$ 68.06

Proceeds from issuance of warrants related to 2023 convertible senior notes

$ 52,400

Payments for Repurchase of Warrants

$ 358,600

Convertible Senior Notes Due 2025

Initial Cap Price per Share, Capped Calls | $ / shares

$ 255.88

Payment for Capped Call, Convertible Debt

$ 74,100

Senior Notes | Convertible Senior Notes Due 2023

Debt issuance costs, gross

$ 3,800

$ 10,000

Shares issuable under warrants granted (in shares) | shares

4,600

7,100

Proceeds from Termination of Note Hedges

$ 405,900

Conversion price (in dollars per share) | $ / shares

$ 48.36

Aggregate amount paid for cost of Note Hedge

$ 80,000

Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares

2,500

Debt Instrument, interest rate, stated percentage

0.25%

Debt instrument, interest rate, effective percentage

4.00%

5.68%

Unamortized debt issuance expense

$ 7,700

Debt Instrument, Convertible, Threshold Consecutive Trading Days | day

Debt Instrument, Redemption Price, Percentage

100.00%

Percentage of closing sale price in excess of convertible notes

98.00%

Senior Notes | Convertible Senior Notes Due 2025

Debt issuance costs, gross

$ 19,300

Conversion price (in dollars per share) | $ / shares

$ 188.71

Debt Instrument, interest rate, stated percentage

0.125%

Proceeds from Issuance of Debt

$ 1,040,700

Debt instrument, interest rate, effective percentage

4.10%

Unamortized debt issuance expense

$ 15,300

Debt Instrument, Convertible, Threshold Consecutive Trading Days | day

Debt Instrument, Redemption Price, Percentage

130.00%

100.00%

Percentage of closing sale price in excess of convertible notes

98.00%

Debt Instrument, Redemption, Sales Price as a Percentage of Conversion Price

130.00%

Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2023

Debt instrument, convertible, equity component, unamortized discount issuance costs

$ 811

811

Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2025

Debt instrument, convertible, equity component, unamortized discount issuance costs

$ 4,040

Convertible Debt Securities [Member]

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares

2,494

7,134

Convertible Debt Securities [Member] | Convertible Senior Notes Due 2025

Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares

5,600

[1]	Adjusted for adoption of ASC 842. See Note 2.

Leases Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Leases Narrative (Details) - USD ($) $ in Millions	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Other Commitments [Line Items]
Sublease income	$ 3.2	$ 0.0	$ 0.0
Weighted average remaining lease term	7 years 10 months 24 days	8 years 10 months 24 days
Weighted average discount rate	5.70%	5.80%
Operating lease payments	$ 18.3	$ 12.9
Lease not yet commenced, undiscounted amount	$ 56.9
Minimum
Other Commitments [Line Items]
Lease not yet commenced, term of contract	1 year 3 months 18 days
Maximum
Other Commitments [Line Items]
Lease not yet commenced, term of contract	8 years 8 months 12 days
San Francisco - Ten Year Lease
Other Commitments [Line Items]
Operating lease term	10 years
Operating lease renewal term	5 years

Leases Schedule of Operating Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Leases [Abstract]
Operating Lease, Cost	$ 23,193	$ 23,290	$ 10,588

Leases Schedule of Maturities of Operating Leases (Details) $ in Thousands	Jan. 31, 2020 USD ($)
Leases [Abstract]
2021	$ 21,225
2022	27,512
2023	27,532
2024	28,110
2024	25,768
Thereafter	81,209
Total lease payments	211,356
Less imputed interest	(44,781)
Operating lease liability	$ 166,575

Commitments and Contingencies - Narrative (Details) - Letter of Credit - USD ($)	Jan. 31, 2020	Jan. 31, 2019
Other Commitments [Line Items]
Letters of credit issued and outstanding	$ 11,900,000	$ 12,700,000
Draws on letters of credit	$ 0

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Commitments and Contingencies - Summary of Future Commitment Maturity Schedules (Details) $ in Thousands	Jan. 31, 2020 USD ($)
Purchase Obligations
2021	$ 56,413
2022	39,110
2023	30,398
2024	30,000
Total contractual obligations	$ 155,921

Common Stock and Stockholders' Equity - Narrative (Details)
$ in Thousands

12 Months Ended

Jan. 31, 2020

USD ($)

vote

Jan. 31, 2019

USD ($)

Jan. 31, 2018

USD ($)

$ 1,746

$ 1,008

^[1]

$ 708

^[1]

Class A Common Stock

Number of votes per share | vote

Class A Common Stock | Contribution of Nonmonetary Assets to Charitable Organization

Issuance of common stock pursuant to charitable donation (in shares) | shares

15,000

20,000

$ 1,700

$ 1,000

Class B Common Stock

Number of votes per share | vote

Class B Common Stock | Contribution of Nonmonetary Assets to Charitable Organization

Issuance of common stock pursuant to charitable donation (in shares) | shares

24,287

$ 700

[1]	Adjusted for adoption of ASC 842. See Note 2.

Common Stock and Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Details)	Jan. 31, 2020 shares
Class of Stock [Line Items]
Common stock reserved for future issuance and options and unvested RSUs outstanding (in shares)	37,362,403
Options and unvested RSUs outstanding
Class of Stock [Line Items]
Options and unvested RSUs outstanding (in shares)	17,252,543
Common stock, reserved for future issuance (in shares)	16,456,003
ESPP
Class of Stock [Line Items]
Common stock, reserved for future issuance (in shares)	3,653,857

Employee Incentive Plans Schedule of Stock-based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 126,624	$ 76,320	$ 49,860
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	21,888	23,466	24,186
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	94,637	41,637	9,104
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	9,408	7,248	7,111
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	590	1,608	3,281
Restricted common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 101	$ 2,361	$ 6,178

Employee Incentive Plans Schedule of Stock-based Compensation Expense by Statement of Operations Location (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 126,624	$ 76,320	$ 49,860
Subscription
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	12,923	7,837	4,600
Professional services and other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7,164	4,983	3,137
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	37,683	22,642	18,107
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	38,077	22,916	13,242
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 30,777	$ 17,942	$ 10,774

Employee Incentive Plans Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	Feb. 17, 2017 USD ($)	Mar. 31, 2017 offering_period shares	Feb. 28, 2017 USD ($) shares	Jan. 31, 2020 USD ($) incentive_plan $ / shares shares	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans \| incentive_plan				2
Options to purchase common stock outstanding (in shares)				12,359,302	17,803,794
Weighted average grant date fair value of options granted (in usd per share) \| $ / shares				$ 37.35	$ 17.21	$ 5.40
Grant date fair value of vested stock options \| $				$ 23,700	$ 23,800	$ 23,900
Intrinsic value of options exercised \| $				558,600	309,300	204,800
Unrecognized stock-based compensation expense \| $				$ 28,200	37,300
Number of options, granted (in shares)				415,547
Issuance of common stock under employee stock purchase plan \| $				$ 18,767	$ 13,727	$ 8,369
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period				2 years 8 months 12 days
Granted during period (in shares)				2,458,095
Shares issued fair value \| $				$ 280,400
Unrecognized compensation costs related to unvested restricted stock units \| $				$ 335,900
Vested during period (in shares)				1,752,333
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (years)				10 years
Vesting period				4 years
Weighted average stock-based compensation recognition period				1 year 4 months 24 days	1 year 10 months 24 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, reserved for future issuance (in shares)				3,653,857
Weighted average stock-based compensation recognition period				7 months 6 days
Unrecognized compensation costs related to unvested restricted stock units \| $				$ 8,800
Shares authorized (in shares)		3,000,000
ESPP offering period		12 months
Number of offering periods \| offering_period		2
ESPP length of purchase period		6 months
Shares issued under ESPP (in shares)				322,795	615,210
Weighted average price, shares issued under ESPP (in usd per share) \| $ / shares				$ 58.14	$ 22.31
Options and unvested RSUs outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, reserved for future issuance (in shares)				16,456,003
Stormpath Inc. \| Restricted common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Granted during period (in shares)			800,000
Shares issued fair value \| $			$ 8,600
Stormpath Inc. \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested during period (in shares)				400,000
Stormpath Inc. \| Stormpath Workforce
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense \| $			2,100
Shares issued fair value \| $	$ 9,100
Pre-combination service consideration \| $	$ 1,500
Stormpath Inc. \| Stormpath Workforce \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs related to unvested restricted stock units \| $			$ 5,500
Vested during period (in shares)				210,850
Stormpath Inc. \| Stormpath Workforce \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Shares issued fair value \| $			$ 2,500
Number of options, granted (in shares)			518,900
Minimum \| Stormpath Inc. \| Stormpath Workforce \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years
Expense recognition period				2 years
Maximum \| Stormpath Inc. \| Stormpath Workforce \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Expense recognition period				3 years
2009 Stock Plan \| Stormpath Inc. \| Stormpath Workforce \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during period (in shares)			598,500
Shares issued fair value \| $			$ 6,600
2017 Equity Incentive Plan \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares)				11,348,049
2017 Equity Incentive Plan \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares)				1,011,253
Vesting Tranche One \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
Vesting percentage earned by employees after each completed year of service				25.00%

Employee Incentive Plans Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Number of Options
Number of options, outstanding beginning of period (in shares)	17,803,794
Number of options, granted (in shares)	415,547
Number of options, exercised (in shares)	(5,422,281)
Number of options, canceled (in shares)	(437,758)
Number of options, outstanding end of period (in shares)	12,359,302	17,803,794
Vested and expected to vest, number of options (in shares)	12,359,302
Vested and exercisable, number of options (in shares)	8,723,638
Weighted- Average Exercise Price
Options outstanding, weighted average exercise price beginning of period (in dollars per share)	$ 9.16
Options granted, weighted average exercise price (in dollars per share)	82.33
Options exercised, weighted average exercise price (in dollars per share)	8.37
Options canceled, weighted average exercise price (in dollars per share)	13.35
Options outstanding, weighted average exercise price end of period (in dollars per share)	11.82	$ 9.16
Vested and expected to vest, weighted average exercise price (in dollars per share)	11.82
Vested and exercisable, weighted average exercise price (in dollars per share)	$ 8.16
Additional Disclosures
Options outstanding, weighted average remaining contractual term	6 years 2 months 12 days	7 years 1 month 6 days
Options outstanding, aggregate intrinsic value	$ 1,436,487	$ 1,304,446
Vested and expected to vest, weighted average remaining contractual term	6 years 2 months 12 days
Vested and exercisable, weighted average remaining contractual term	5 years 10 months 24 days
Vested and expected to vest, aggregate intrinsic value	$ 1,436,487
Vested and exercisable, aggregate intrinsic value	$ 1,045,852

Employee Incentive Plans Schedule of Black-Scholes Option Pricing Model Estimated Fair Value Assumptions (Details)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	43.00%	40.00%
Expected volatility, minimum			40.00%
Expected volatility, maximum			41.00%
Expected term (in years)	6 years 3 months 18 days	6 years 3 months 18 days
Risk-free interest rate		2.70%
Risk-free interest rate, minimum	1.55%		1.87%
Risk-free interest rate, maximum	2.27%		2.21%
Expected dividend yield	0.00%	0.00%	0.00%
Stock options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)			6 years 3 months 18 days
Stock options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)			6 years 4 months 24 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	43.00%	39.00%	32.00%
Expected volatility, maximum	59.00%	70.00%	38.00%
Risk-free interest rate, minimum	1.53%	2.12%	0.95%
Risk-free interest rate, maximum	2.05%	2.62%	1.73%
Expected dividend yield	0.00%	0.00%	0.00%
ESPP \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 months	6 months	6 months
ESPP \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	1 year	1 year	1 year 2 months 12 days

Employee Incentive Plans Schedule of Restricted Stock Unit Activity (Details) - RSUs	12 Months Ended
	Jan. 31, 2020 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (in shares) \| shares	4,835,536
Granted during period (in shares) \| shares	2,458,095
Vested during period (in shares) \| shares	(1,752,333)
Forfeited during period (in shares) \| shares	(648,057)
Outstanding at end of period (in shares) \| shares	4,893,241
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding at beginning of period (in dollars per share) \| $ / shares	$ 44.49
Granted during period (in dollars per share) \| $ / shares	114.07
Vested during period (in dollars per share) \| $ / shares	44.69
Forfeited during period (in dollars per share) \| $ / shares	54.94
Outstanding at end of period (in dollars per share) \| $ / shares	$ 77.99

Income Taxes - Schedule of Domestic and Foreign Components of Pre-tax Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (220,846)	$ (128,214)	$ (112,858)
Foreign	10,514	2,700	2,688
Loss before benefit from income taxes	$ (210,332)	$ (125,514)	$ (110,170)

Income Taxes - Schedule of Components of Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Current:
Federal	$ 33	$ 0	$ 0
State	86	61	0
Foreign	822	667	183
Total current provision for income taxes	941	728	183
Deferred:
Federal	(518)	(620)	(32)
State	(406)	(130)	10
Foreign	(1,436)	5	(482)
Total deferred benefit from income taxes	(2,360)	(745)	(504)
Total benefit from income taxes	$ (1,419)	$ (17)	$ (321)

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
Income Taxes - Narrative (Details) - USD ($)	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax benefit, excess tax deduction, foreign employees			$ 1,300,000
Increase in valuation allowance	$ 157,700,000	$ 86,600,000
Reduction in deferred tax asset before valuation allowance due to change in tax rate		56,500,000
Accrued penalties and interest related to unrecognized tax benefits	0	$ 0
Domestic Tax Authority
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating loss carryforwards	1,462,600,000
Domestic Tax Authority \| Research Tax Credit Carryforward
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax credit carryforward	35,300,000
State and Local Jurisdiction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating loss carryforwards	919,500,000
State and Local Jurisdiction \| Research Tax Credit Carryforward
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax credit carryforward	23,400,000
State and Local Jurisdiction \| California Enterprise Zone Credit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax credit carryforward	1,000,000.0
UNITED KINGDOM
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating loss carryforwards	$ 29,900,000

Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	21.00%	21.00%	33.80%
State income taxes, net of federal benefit	4.00%	3.80%	3.40%
Change in valuation allowance	(100.10%)	(68.50%)	(27.10%)
Stock-based compensation	59.80%	45.50%	42.40%
Research and development credits	18.00%	0.00%	0.00%
Tax Cuts and Jobs Act of 2017	0.00%	0.00%	(51.30%)
Other, net	(2.00%)	(1.80%)	(0.90%)
Effective tax rate	0.70%	0.00%	0.30%

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Deferred tax assets:
Net operating loss carryforwards	$ 370,705	$ 202,471
Stock-based compensation	18,680	13,185
Deferred revenue	1,960	1,312
Operating lease liabilities	42,073	39,060
Other reserves and accruals	6,414	3,750
Research and development and other credits	39,918	791
Convertible debt	0	477
Disallowed interest	4,507	1,292
Total deferred tax assets	484,257	262,338
Valuation allowance	(361,606)	(203,899)
Total deferred tax assets, net	122,651	58,439
Deferred tax liabilities:
Convertible debt	(50,963)	0
Deferred commissions	(27,569)	(19,424)
Capitalized internal-use software costs	(2,248)	(2,047)
Goodwill	(262)	(217)
Operating lease right-of-use assets	(31,165)	(29,697)
Depreciation and amortization	(8,315)	(6,492)
Total deferred tax liabilities	(120,522)	(57,877)
Net deferred tax asset	$ 2,129	$ 562

Income Taxes - Unrecognized Tax Benefits Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross amount of unrecognized tax benefits as of the beginning of the year	$ 23,931	$ 11,719	$ 5,775
Additions based on tax positions related to a prior year	658	1,859	0
Additions based on tax positions related to current year	6,866	10,353	5,944
Reductions based on tax positions related to current year	0	0	0
Reductions based on tax positions taken in a prior year	(15,468)	0	0
Gross amount of unrecognized tax benefits as of the end of the year	$ 15,987	$ 23,931	$ 11,719

Net Loss Per Share Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands

12 Months Ended

Jan. 31, 2020

Jan. 31, 2019

Jan. 31, 2018

Numerator:

Weighted-average shares outstanding, basic and diluted (in shares)

$ (208,913)

$ (125,497)

^[1]

$ (109,849)

^[1]

Denominator:

117,221

107,504

83,004

Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)

$ (1.78)

$ (1.17)

$ (1.32)

Class A Common Stock

Denominator:

Weighted-average shares outstanding, basic and diluted (in shares)

107,809

92,452

24,165

Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)

$ (1.78)

$ (1.17)

$ (1.32)

Class B Common Stock

Denominator:

Weighted-average shares outstanding, basic and diluted (in shares)

9,412

15,052

58,839

Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)

$ (1.78)

$ (1.17)

$ (1.32)

Common Stock | Class A Common Stock

Numerator:

Common Stock | Class B Common Stock

$ (192,138)

$ (107,926)

$ (31,980)

Numerator:

$ (16,775)

$ (17,571)

$ (77,869)

[1]	Adjusted for adoption of ASC 842. See Note 2.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.