Cash and cash equivalents

$ 211,756

$ 127,949

Short-term investments

335,285

101,765

Accounts receivable, net of allowances of $1,569 and $1,472

50,368

52,248

18,551

17,755

20,203

17,781

Property and equipment, net

636,163

317,498

19,176

12,540

41,077

40,755

Intangible assets, net

11,863

11,761

Goodwill

6,282

Other assets

12,343

10,427

726,904

399,263

Accrued expenses and other current liabilities

Accounts payable

11,830

9,566

4,896

6,187

Accrued compensation

12,652

12,374

173,548

159,816

Convertible senior notes, net

202,926

187,943

259,920

Other liabilities, noncurrent

4,346

4,963

10,095

7,017

Commitments and contingencies (Note 9)

477,287

199,923

Stockholders’ equity:

Preferred stock, par value $0.0001 per share; 100,000 shares authorized, no shares issued and outstanding as of April 30, 2018 and January 31, 2018.

Additional paid-in capital

642,460

565,653

Accumulated other comprehensive income (loss)

(178)

391

(392,676)

(366,714)

249,617

199,340

726,904

399,263

Class A Common Stock

Stockholders’ equity:

Common stock

Class B Common Stock

Stockholders’ equity:

Common stock

$ 2

$ 3

[1]	See Note 2 for a summary of adjustments.

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Statement of Financial Position [Abstract]
Allowance for accounts receivable	$ 1,569	$ 1,472
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (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)	87,254,000	70,610,000
Common stock, shares outstanding (in shares)	87,254,000	70,610,000
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)	19,238,000	33,361,000
Common stock, shares outstanding (in shares)	19,238,000	33,361,000

Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands

3 Months Ended

Apr. 30, 2018

Apr. 30, 2017

^[1]

Revenue:

$ 76,841

$ 48,279

6,780

4,046

83,621

52,325

Cost of revenue:

16,332

11,157

7,775

6,306

Total cost of revenue

24,107

17,463

59,514

34,862

Research and development

19,929

15,359

General and administrative

49,493

35,303

15,070

11,639

Loss before provision for (benefit from) income taxes

84,492

62,301

Operating loss

(24,978)

(27,439)

Other expense, net

(1,215)

(19)

(26,193)

(27,458)

Provision for (benefit from) income taxes

(231)

248

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

$ (25,962)

$ (27,706)

^[2],[3]

$ (0.25)

$ (0.70)

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

104,203

39,783

[1]	See Note 2 for a summary of adjustments.
[2]	See Note 2 for a summary of adjustments.
[3]	See Note 2 for a summary of adjustments.

Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands

3 Months Ended

Apr. 30, 2018

Apr. 30, 2017

^[2]

Statement of Comprehensive Income [Abstract]

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

$ (25,962)

$ (27,706)

^[1],[3]

Other comprehensive income (loss):

(125)

Foreign currency translation adjustments

(444)

Other comprehensive income (loss)

(569)

Comprehensive loss

$ (26,531)

$ (27,638)

[1]	See Note 2 for a summary of adjustments.
[2]	See Note 2 for a summary of adjustments.
[3]	See Note 2 for a summary of adjustments.

Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands

3 Months Ended

Apr. 30, 2018

Apr. 30, 2017

^[3]

Cash flows from operating activities:

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

$ (25,962)

$ (27,706)

^[1],[2]

Stock-based compensation

14,135

8,906

Depreciation, amortization and accretion

2,069

1,575

Amortization of debt discount and issuance costs

2,571

Amortization of deferred commissions

4,572

2,162

Deferred income taxes

(348)

Other

161

270

Changes in operating assets and liabilities:

Accounts receivable

1,719

2,243

Prepaid expenses and other assets

(5,693)

(3,033)

(3,983)

(3,756)

Accounts payable

2,339

3,236

Accrued compensation

329

(2,121)

Accrued expenses and other liabilities

(1,051)

323

Net cash provided by (used in) operating activities

13,114

8,215

3,972

(9,686)

Cash flows from investing activities:

Capitalization of internal-use software costs

(1,051)

(1,208)

Purchases of property and equipment

(4,477)

(2,448)

Purchases of securities available for sale

(252,914)

Proceeds from maturities of securities available for sale

19,500

10,335

Proceeds from sales of securities available for sale

1,538

Net cash provided by (used in) investing activities

(238,942)

8,217

Cash flows from financing activities:

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

199,997

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

335,055

Purchase of convertible senior notes hedge

(80,040)

Proceeds from issuance of warrants related to convertible notes

52,440

Payments of deferred offering costs

(2,246)

Proceeds from stock option exercises, net of repurchases

12,196

2,564

Other

(206)

(207)

Net cash provided by financing activities

319,445

200,108

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

(387)

Net increase in cash, cash equivalents and restricted cash

84,088

198,707

Cash, cash equivalents and restricted cash at beginning of period

136,233

23,282

Cash, cash equivalents and restricted cash at end of period

220,321

221,989

Non-cash investing and financing activities:

Vesting of early exercised common stock options

243

328

Issuance of common stock in connection with warrant exercises

272

Deferred offering costs accrued but not yet paid

1,772

Property and equipment acquired through tenant improvement allowance

3,329

Property and equipment and other accrued but not yet paid

147

1,931

Issuance of common stock in connection with business combination

2,160

Conversion of redeemable convertible preferred stock to common stock

228,362

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

Total cash, cash equivalents and restricted cash

$ 136,233

$ 23,282

[1]	See Note 2 for a summary of adjustments.
[2]	See Note 2 for a summary of adjustments.
[3]	See Note 2 for a summary of adjustments.

Overview and Basis of Presentation	3 Months Ended
Overview and Basis of Presentation	Apr. 30, 2018
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 provider of identity for the enterprise. The Okta Identity Cloud enables 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 unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with U.S. generally accepted accounting principles (GAAP). All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated balance sheet as of January 31, 2018, included herein, was derived from the audited financial statements as of that date. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the balance sheet, statements of operations, statements of comprehensive loss and the statements of cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2019 or any future period. The Company’s fiscal year ends on January 31. References to fiscal 2019, for example, refer to the fiscal year ending January 31, 2019. The condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s Form 10-K filed with the Securities and Exchange Commission (SEC) on March 12, 2018. Effective February 1, 2018, the Company adopted the requirements of Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers as discussed in Note 2. All amounts and disclosures set forth in this Form 10-Q have been updated to comply with this standard, as indicated by references to "as adjusted" in these condensed consolidated financial statements and related notes. Certain reclassifications of prior period amounts have been made in our condensed consolidated financial statements to conform to the current period presentation. Initial Public Offering In April 2017, the Company completed an initial public offering (IPO), in which the Company issued and sold 12,650,000 shares of its Class A common stock at a public offering price of $17.00 per share. The Company received aggregate proceeds of $200.0 million from the IPO, net of underwriters’ discounts and commissions, before deducting offering costs of approximately $5.6 million. Immediately prior to the completion of the IPO, all shares of common stock then outstanding were reclassified as Class B common stock, and all shares of redeemable convertible preferred stock then outstanding were converted into 59,491,640 shares of common stock on a one-to-one basis and then reclassified into Class B common stock. 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, including the initial purchasers’ exercise in full of their option to purchase additional notes (2023 Notes). The Company received aggregate proceeds of $345.0 million, before deducting costs of issuance of $10.0 million. See Note 8 for additional details. Use of Estimates The preparation of condensed 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 condensed 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 the 2023 Notes, valuation of deferred income tax assets and contingencies.

Accounting Standards and Significant Accounting Policies

3 Months Ended

Apr. 30, 2018

Accounting Policies [Abstract]

Accounting Standards and Significant Accounting Policies

Recently Adopted Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). Topic 606 supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) Topic 605, Revenue Recognition (Topic 605), and requires the recognition of revenue when promised goods or services are transferred to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. Topic 606 also includes Subtopic 340-40, Other Assets and Deferred Costs - Contracts with Customers, which requires the deferral of incremental costs of obtaining a contract with a customer. Collectively, the Company refers to Topic 606 and Subtopic 340-40 as "ASC 606."

The Company adopted the requirements of ASC 606 as of February 1, 2018, utilizing the full retrospective method of transition. Adoption of ASC 606 resulted in changes to the Company’s accounting policies for revenue recognition and deferred commissions as detailed below. The Company applied ASC 606 using a practical expedient where the consideration allocated to the remaining performance obligations or an explanation of when the Company expects to recognize that amount as revenue for all reporting periods presented before the date of the initial application is not disclosed.

The impact of adopting ASC 606 on fiscal 2018 and 2017 revenue is not material. The primary impact of adopting ASC 606 relates to the deferral of incremental commission costs of obtaining contracts. Under Topic 605, the Company deferred only direct and incremental commission costs to obtain a contract and amortized those costs on a straight-line basis over the term of the related contract, which was generally one to three years. Under ASC 606, the Company defers all incremental commission costs to obtain the contract. The Company amortizes these costs on a straight-line basis over a period of benefit, determined to be generally five years.

The Company adjusted its condensed consolidated financial statements from amounts previously reported due to the adoption of ASC 606. Select condensed consolidated statement of operations line items, which reflect the adoption of ASC 606, are as follows (in thousands except per share data):



	Three Months Ended April 30, 2017
	As Reported			Adjustments			As Adjusted
	(unaudited)
Revenue:
Subscription	$	48,357		$	(78	)	$	48,279
Professional services and other	4,650			(604		)	4,046
Total revenue	53,007			(682		)	52,325
Gross profit	35,544			(682		)	34,862
Operating expenses:
Sales and marketing	37,180			(1,877		)	35,303
Total operating expenses	64,178			(1,877		)	62,301
Loss before income taxes	(28,653		)	1,195			(27,458		)
Net loss	(28,901		)	1,195			(27,706		)
Net loss per share, basic and diluted	(0.73		)	0.03			(0.70		)

Select condensed consolidated balance sheet line items, which reflect the adoption of ASC 606, are as follows (in thousands):



	As of January 31, 2018
	As Reported			Adjustments			As Adjusted
	(unaudited)
Assets
Current assets:
Deferred commissions	$	16,481		$	1,274		$	17,755
Prepaid expenses and other current assets	16,973			808			17,781
Total current assets	315,416			2,082			317,498
Deferred commissions, noncurrent	10,971			29,784			40,755
Total assets	367,397			31,866			399,263

Liabilities and stockholders’ equity
Current liabilities:
Deferred revenue	$	162,633		$	(2,817	)	$	159,816
Total current liabilities	190,760			(2,817		)	187,943
Deferred revenue, noncurrent	6,034			(1,071		)	4,963
Total liabilities	203,811			(3,888		)	199,923
Accumulated deficit	(402,468		)	35,754			(366,714		)
Total stockholders’ equity	163,586			35,754			199,340
Total liabilities and stockholders’ equity	367,397			31,866			399,263

The adoption of ASC 606 had no impact to cash provided by or used in operating, financing, or investing activities on the Company’s condensed consolidated statement of cash flows. Additionally, the adoption of ASC 606 did not have a material impact on the provision for (benefit from) income taxes. The adoption adjustments impacted the deferred income taxes pertaining to the U.S. entity which are subject to a full valuation allowance.

Significant Accounting Policies

The Company’s significant accounting policies are discussed in “Note 2. Summary of Significant Accounting Policies” in Item 8. Financial Statements and Supplementary Data of its Form 10-K for the fiscal year ended January 31, 2018. Except for the accounting policies for revenue recognition and deferred commissions that were updated below as a result of adopting ASC 606, there have been no significant changes to these policies for the three months ended April 30, 2018.

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


•	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 are recognized as services are performed in proportion with 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, if available, observable prices for those related services when sold separately. When 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.

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 collectability of accounts by considering the age of each outstanding invoice and 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 condensed consolidated balance sheets with an offsetting decrease in related deferred revenue or a charge in the condensed consolidated statement of operations.

For the three months ended April 30, 2018 and 2017, write-offs were not material.

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 contracts are deferred and then amortized on a straight-line basis over a period of benefit that 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. Amortization expense is included in sales and marketing expenses in the accompanying condensed consolidated statements of operations.

Sales commissions capitalized as contract costs totaled $5.6 million and $4.2 million during the three months ended April 30, 2018 and 2017, respectively. Amortization of contract costs was $4.6 million and $3.4 million for the three months ended April 30, 2018 and 2017, respectively, and there was no impairment loss in relation to the costs capitalized.

Convertible Senior Notes

The 2023 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 2023 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. 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 term of the 2023 Notes using the 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 2023 Notes, the allocation amount of issuance costs incurred to liability and equity components was based on their relative values.

Recently Issued Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases (ASU 2016-02), which supersedes the guidance in topic ASC 840, Leases. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The Company will be required to recognize and measure leases existing at, or entered into after, the beginning of the earliest comparative period presented using a modified retrospective approach, with certain practical expedients available. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements, which will consist primarily of a balance sheet gross up of its operating leases to show equal and offsetting right-of-use assets and lease liabilities.

In February 2018, the FASB issued ASU No. 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (ASU 2018-02). Under existing U.S. GAAP, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of income tax expense in the period in which the law was enacted. When deferred tax balances related to items originally recorded in accumulated other comprehensive income (loss) are adjusted, certain tax effects become stranded in accumulated other comprehensive income. The amendments in ASU 2018-02 allow a reclassification from accumulated other comprehensive income (loss) to retained earnings (accumulated deficit) for stranded income tax effects resulting from the Tax Cuts and Jobs Act of 2017 (the Tax Act). The amendments in this ASU also require certain disclosures about stranded income tax effects. The guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption in any period is permitted. The Company’s provisional adjustments recorded in fiscal year 2018 to account for the impact of the Tax Act did not result in stranded tax effects. The Company does not anticipate that the adoption of this standard will have a material impact on its condensed consolidated financial statements.

Business Combination	3 Months Ended
Business Combination	Apr. 30, 2018
Business Combinations [Abstract]
Business Combination	Business Combination On February 17, 2017, the Company acquired the rights to hire certain employees and a non-exclusive intellectual property license from Stormpath, Inc. (Stormpath), a privately-held technology company which had built a user management and authentication service for software development teams. The transaction was accounted for as a business combination. The total consideration of $3.7 million, consisting of 200,000 shares of common stock valued at $2.2 million, at the time of the transaction, issued to Stormpath and replacement awards of $1.5 million issued to the hired employees, was recognized as goodwill. In addition, the Company issued to Stormpath an incremental 800,000 shares of restricted common stock valued at $8.6 million, at the time of the transaction, which is being recognized as post-combination stock-based compensation expense. See Note 10 for further details.

Cash Equivalents and Short-Term Investments

3 Months Ended

Apr. 30, 2018

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 April 30, 2018 and January 31, 2018 were as follows (in thousands):



	As of April 30, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value

	(unaudited)
Cash equivalents:
Money market funds	$	145,932	$	—	$	—		$	145,932
Commercial paper	9,972		—		—			9,972
U.S. treasury securities	9,995		—		—			9,995
Corporate debt securities	6,996		—		(1		)	6,995
Total cash equivalents	$	172,895	$	—	$	(1	)	$	172,894
Short-term investments:
Commercial paper	$	43,639	$	—	$	—		$	43,639
U.S. treasury securities	251,000		—		(270		)	250,730
Corporate debt securities	40,972		1		(57		)	40,916
Total short-term investments	335,611		1		(327		)	335,285
Total	$	508,506	$	1	$	(328	)	$	508,179



	As of January 31, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	90,770	$	—	$	—		$	90,770
Total cash equivalents	$	90,770	$	—	$	—		$	90,770
Short-term investments:
Commercial paper	$	15,946	$	—	$	—		$	15,946
U.S. treasury securities	61,896		—		(158		)	61,738
Corporate debt securities	24,125		—		(44		)	24,081
Total short-term investments	101,967		—		(202		)	101,765
Total	$	192,737	$	—	$	(202	)	$	192,535

All short-term investments were designated as available-for-sale securities as of April 30, 2018 and January 31, 2018.

The following tables present the contractual maturities of the Company’s short-term investments as of April 30, 2018 and January 31, 2018 (in thousands):



	As of April 30, 2018				As of January 31, 2018
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value

	(unaudited)
Due within one year	$	306,045	$	305,761	$	93,421	$	93,237
Due between one to five years	29,566		29,524		8,546		8,528
	$	335,611	$	335,285	$	101,967	$	101,765

The Company had 55 and 23 short-term investments in unrealized loss positions as of April 30, 2018 and January 31, 2018, respectively. There were no material gross unrealized gains or losses from available-for-sale securities and no realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the three months ended April 30, 2018 or 2017.

For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) it has the intention to sell any of these investments and (ii) whether it is not more likely than not that it 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 April 30, 2018 and January 31, 2018.

Fair Value Measurements

3 Months Ended

Apr. 30, 2018

Fair Value Disclosures [Abstract]

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 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 and liabilities that are measured at fair value on a recurring basis using the above input categories (in thousands):



	As of April 30, 2018
	Level 1		Level 2		Level 3		Total

	(unaudited)
Assets:
Cash equivalents:
Money market funds	$	145,932	$	—	$	—	$	145,932
Commercial paper	—		9,972		—		9,972
U.S. treasury securities	—		9,995		—		9,995
Corporate debt securities	—		6,995		—		6,995
Total cash equivalents	$	145,932	$	26,962	$	—	$	172,894
Short-term investments:
Commercial paper	$	—	$	43,639	$	—	$	43,639
U.S. treasury securities	—		250,730		—		250,730
Corporate debt securities	—		40,916		—		40,916
Total short-term investments	—		335,285		—		335,285
Total cash equivalents and short-term investments	$	145,932	$	362,247	$	—	$	508,179



	As of January 31, 2018
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	90,770	$	—	$	—	$	90,770
Total cash equivalents	$	90,770	$	—	$	—	$	90,770
Short-term investments:
Commercial paper	$	—	$	15,946	$	—	$	15,946
U.S. treasury securities	—		61,738		—		61,738
Corporate debt securities	—		24,081		—		24,081
Total short-term investments	—		101,765		—		101,765
Total cash equivalents and short-term investments	$	90,770	$	101,765	$	—	$	192,535

The Company had no transfers between levels of the fair value hierarchy of its assets measured at fair value.

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 condensed consolidated balance sheets (in thousands):



	As of April 30, 2018
	Net Carrying Amount Before Unamortized Debt Issuance Costs		Estimated Fair Value

	(unaudited)
Convertible senior notes	$	267,418	$	394,680

The difference between the principal amount of the 2023 Notes, $345.0 million, and the net carrying amount before unamortized debt issuance costs represents the unamortized debt discount (see Note 8). The estimated fair value of the 2023 Notes, which the Company has classified as Level 2 financial instruments, was determined based on the quoted bid price of the convertible senior notes in an over-the-counter market on the last trading day of the reporting period. Based on the closing price of our common stock of $42.81 on April 30, 2018, the if-converted value of the 2023 Notes was less than the principal amount of $345.0 million.

- Definition

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.

+ References + Details

Goodwill and Intangible Assets, net

3 Months Ended

Apr. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

Goodwill

As of April 30, 2018 and January 31, 2018, goodwill was $6.3 million. No goodwill impairments were recorded during the three months ended April 30, 2018 and 2017.

Intangible Assets, net

Intangible assets consisted of the following (in thousands):



	As of April 30, 2018
	Gross		Accumulated Amortization			Write-offs		Net

	(unaudited)
Capitalized internal-use software costs	$	17,706	$	(6,282	)	$	—	$	11,424
Software licenses	1,023		(584		)	—		439
	$	18,729	$	(6,866	)	$	—	$	11,863



	As of January 31, 2018
	Gross		Accumulated Amortization			Write-offs			Net
Capitalized internal-use software costs	$	17,511	$	(5,172	)	$	(1,077	)	$	11,262
Software licenses	1,094		(558		)	(37		)	499
Purchased developed technology	570		(570		)	—			—
	$	19,175	$	(6,300	)	$	(1,114	)	$	11,761

The Company capitalized $1.3 million and $1.4 million of internal-use software costs in the three months ended April 30, 2018 and 2017, respectively. Included in the total amount capitalized is stock-based compensation expense of $0.2 million for each of the three months ended April 30, 2018 and 2017.

Intangible amortization expense was $1.2 million and $0.7 million for the three months ended April 30, 2018 and 2017, respectively.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Deferred Revenue and Performance Obligations	3 Months Ended
Deferred Revenue and Performance Obligations	Apr. 30, 2018
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 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 three months ended April 30, 2018 and 2017 that was included in the deferred revenue balances at the beginning of the respective periods was $64.6 million and $40.9 million, respectively. Professional services and other revenue recognized in the same periods 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 contracted revenue that has not yet been recognized, which includes deferred revenue for subscription contracts that have been invoiced and will be recognized as revenue in future periods. As of April 30, 2018, total remaining noncancelable performance obligations under the Company’s subscription contracts with customers was approximately $499.1 million, and the Company expects to recognize revenue on approximately 56% of these remaining performance obligations over the next 12 months, with the balance to be recognized thereafter. Revenue from remaining performance obligations for professional services and other contracts as of April 30, 2018 was not material. Unbilled Receivables The Company receives payments from customers based on billing schedules as established in its contracts. Unbilled receivables, which is a contract asset, relate to the Company’s rights to consideration for performance obligations satisfied but not billed at the reporting date on contracts. Unbilled receivables were $1.6 million and $0.8 million as of April 30, 2018 and January 31, 2018, respectively, and are included in prepaid expenses and other current assets in the condensed consolidated balance sheets. Unbilled receivables are transferred to accounts receivable when the rights become unconditional.

Debt and Financing Arrangements

3 Months Ended

Apr. 30, 2018

Debt Disclosure [Abstract]

Debt and Financing Arrangements

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 approximately $335.0 million.

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. It is the Company’s current intent to settle the principal amount of the 2023 Notes with cash.

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 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. During the three months ended April 30, 2018, the conditions allowing holders of the 2023 Notes to convert were not met.

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. The carrying amounts of the liability components were calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity components representing the conversion option were determined by deducting the fair value of the liability component from the par value of the 2023 Notes. The Company bifurcated the conversion option of the 2023 Notes from the debt instrument, classified the conversion option in equity and will accrete the resulting debt discount as interest expense over the contractual term of the 2023 Notes using the effective interest rate method. The equity component is not remeasured as long as they continue to meet the conditions for equity classification.

The effective interest rate of the liability component of the 2023 Notes is 5.68%. This interest rate was based on the interest rates of similar liabilities held by other companies with similar credit risk ratings at the time of issuance that did not have associated convertible features. The following table sets forth total interest expense recognized related to the 2023 Notes (in thousands):



	Three Months Ended April 30, 2018
	(unaudited)
Contractual interest expense	$	146
Amortization of debt issuance costs	190
Amortization of debt discount	2,381
Total	$	2,717

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 April 30, 2018
	(unaudited)
Liability component:
Principal	$	345,000
Less: unamortized debt issuance costs and debt discount	(85,080		)
Net carrying amount	$	259,920

	At Issuance
	(unaudited)
Equity component:
2023 Notes	$	79,962
Less: issuance costs	(2,320		)
Carrying amount of the equity component⁽¹⁾	$	77,642

⁽¹⁾ Included in the condensed 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 (the 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 $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 condensed consolidated balance sheets.

See Note 11 for the tax impacts of the 2023 Notes and Note Hedges.

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 (the 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 $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 was recorded as an increase to Additional paid-in capital in the condensed consolidated balance sheets.

Loan and Security Agreement

The Company has available a line of credit (Revolving Line) with Silicon Valley Bank (SVB) in the amount of $40.0 million, with a maturity date of November 21, 2018. The available amount, not to exceed $40.0 million, is based on certain revenue metrics and is reduced by letters of credit totaling $4.2 million as of April 30, 2018 established in connection with facility lease agreements. As of April 30, 2018, $35.8 million was available under the Revolving Line.

Proceeds from loans made under the Revolving Line may be borrowed, repaid and reborrowed until November 21, 2018. Repayment of any outstanding proceeds are payable on November 21, 2018, but may be prepaid without penalty. Borrowings under the Revolving Line bear interest at an annual rate based on the one-year Prime rate plus a spread of 0.75%. Interest is payable quarterly. The Company is required to pay a quarterly facility fee to SVB of 0.15% per annum on the average undrawn portion available under the facility plus balances of outstanding letters of credits. Additionally, the Company is required to pay an upfront, one-time, commitment fee of $0.1 million and annual anniversary fees of $0.1 million on the amendment’s first and second anniversary dates.

As of April 30, 2018 and January 31, 2018, no amounts had been drawn under the Revolving Line and the Company was in compliance with all covenants pursuant to the loan and security agreement.

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Apr. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Leases The Company leases office space under noncancelable operating leases for its San Francisco, California headquarters, as well as its offices in various cities in the United States, United Kingdom, Australia and Canada. These office leases expire on various dates through October 2028. Deferred rent was $9.0 million and $5.5 million as of April 30, 2018 and January 31, 2018, respectively, which is included in accrued expenses and other current liabilities and other liabilities, noncurrent in the condensed consolidated balance sheets. Rent expense was $3.4 million and $2.2 million for the three months ended April 30, 2018 and 2017, respectively. In conjunction with the execution of leases, letters of credit in the aggregate amount of $12.4 million and $12.2 million were issued and outstanding as of April 30, 2018 and January 31, 2018, respectively. No draws have been made under such letters of credit. The Company secured its new corporate headquarters lease in San Francisco with an $8.0 million letter of credit, which is designated as restricted cash and included in other assets on its condensed consolidated balance sheet as of April 30, 2018. 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 April 30, 2018.

Employee Incentive Plans

3 Months Ended

Apr. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Employee Incentive Plans

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

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



	Three Months Ended April 30,
	2018		2017

	(unaudited)
Cost of revenue
Subscription	$	1,529	$	686
Professional services and other	889		469
Research and development	4,213		3,301
Sales and marketing	4,153		2,375
General and administrative	3,351		2,075
Total	$	14,135	$	8,906

Stock-based compensation expense recorded to research and development in the condensed consolidated statements of operations excludes amounts that were capitalized related to internal-use software for the three months ended April 30, 2018 and 2017. See Note 6 for further 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). Upon the completion of the Company’s IPO in April 2017, the Company ceased granting equity under the 2009 Plan, and all shares that remained available for future issuance under the 2009 Plan at that time were transferred to the 2017 Plan. As of April 30, 2018, options granted under the 2009 Plan to purchase 21,910,897 shares of Class B common stock remain outstanding and options granted under the 2017 Plan to purchase 764,596 shares of Class A common stock remain outstanding.

Shares of common stock reserved for future issuance are as follows:



	As of
	April 30, 2018
	(unaudited)
Stock options and unvested RSUs outstanding	26,108,047
Available for future stock option and RSU grants	14,193,351
Available for ESPP	3,470,337
	43,771,735

Stock Options

A summary of the Company’s stock option activity and related information is 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, 2018	24,917,045		$	7.37	7.6	$	550,173
Granted	684,500		39.21
Exercised	(2,461,383	)	4.95
Canceled	(464,669	)	8.24
Outstanding as of April 30, 2018 (unaudited)	22,675,493		$	8.58	7.7	$	776,287
As of April 30, 2018
Vested and exercisable (unaudited)	9,285,314		$	5.81	6.9	$	343,540

The weighted-average grant-date fair value of options granted was $17.21 and $5.36 during the three months ended April 30, 2018 and 2017, respectively. The total grant-date fair value of stock options vested was $5.6 million and $4.6 million during the three months ended April 30, 2018 and 2017, 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 $81.9 million and $14.1 million for the three months ended April 30, 2018 and 2017, respectively.

As of April 30, 2018, there was a total of $58.0 million of unrecognized stock-based compensation expense, which is expected to be recognized over a weighted-average period of 2.5 years.

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



	Three Months Ended April 30,
	2018	2017

	(unaudited)
Expected volatility	40%	40% - 41%
Expected term (in years)	6.25	6.0 - 6.4
Risk-free interest rate	2.70%	2.06% - 2.21%
Expected dividend yield	—	—

Restricted Stock Units

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



	Number of RSUs		Weighted- Average Grant Date Fair Value Per Share

Outstanding as of January 31, 2018	2,862,929		$	24.38
Granted	717,630		39.97
Vested	(58,825	)	17.00
Forfeited	(89,180	)	24.74
Outstanding as of April 30, 2018 (unaudited)	3,432,554		$	27.75

As of April 30, 2018, there was $81.8 million of unrecognized stock-based compensation expense related to unvested RSUs, which is expected to be recognized over a weighted-average period of 3.4 years based on vesting under the award service conditions.

Equity Awards Issued in Connection with Business Combination

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 at the time of the transaction to be recognized as post combination stock-based compensation. The restricted common stock vests ratably on the first and second anniversaries of the transaction date upon achievement of the respective performance conditions, of which 400,000 shares vested during the three months ended April 30, 2018. As of April 30, 2018, there was $1.7 million of unrecognized compensation expense related to restricted common stock which is expected to be recognized over the remaining weighted average life of 0.8 years.

The Company separately entered into retention arrangements with certain employees of Stormpath and issued 598,500 restricted stock awards under the 2009 Plan with an aggregate fair value of $6.6 million at the time of the transaction with performance conditions. 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 was related to pre-combination service and was recognized as goodwill and a reduction to the post-combination compensation expense. 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.

During the three months ended April 30, 2018, 210,850 shares of restricted stock awards vested. As of April 30, 2018, there was $1.8 million of unrecognized compensation expense related to unvested restricted stock awards, which is expected to be recognized over the remaining weighted average life of 1.3 years.

As of April 30, 2018, there was $1.5 million of unrecognized compensation cost related to unvested stock options, which is expected to be recognized over the remaining weighted average life of 2.2 years. The related stock options expense and activity are included within the Stock Options section above.

Employee Stock Purchase Plan

As of April 30, 2018, there was $1.5 million of unrecognized stock-based compensation expense related to ESPP that is expected to be recognized over an average vesting period of 0.2 years.

Income Taxes	3 Months Ended
Income Taxes	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended April 30, 2018 and 2017, the Company recorded a tax benefit of $0.2 million and a tax provision of $0.2 million on a pretax loss of $26.2 million and $27.5 million, respectively. The effective tax rate for the three months ended April 30, 2018 and 2017 was 0.9% and (0.9)%, respectively. The effective tax rate for the three months ended April 30, 2018 differs from the statutory rate primarily as a result of tax benefits from stock-based compensation in the United Kingdom, providing no benefit on pretax losses incurred in the United States, as the Company has determined that the benefit of the losses is not more likely than not to be realized, and changes to provisional amounts recorded for certain aspects of the Tax Act. The effective tax rate for the three months ended April 30, 2017 differs from the statutory rate primarily as a result of the Company not providing any benefit on pretax losses incurred in the United States, as the Company has determined that the benefit of the losses is not more likely than not to be realized. The difference between the book and tax bases of the 2023 Notes, Note Hedges and debt issuance costs resulted in deductible temporary differences and corresponding deferred tax assets of $0.6 million, which are subject to a full valuation allowance. On December 22, 2017, the 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 21% effective for tax years beginning after December 31, 2017, and changes to how the United States imposes income tax on multinational corporations. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118), which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. The Company recorded a provisional amount of $61.0 million as of January 31, 2018 related to the remeasurement of certain deferred tax balances before valuation allowance. For the three months ended April 30, 2018, the Company has not made a material adjustment to the provisional amount. The Company will continue to analyze and refine the calculations to the measurement of these balances. For the three months ended April 30, 2018, no other changes have been made to the provisional amounts previously recorded. The Company expects to complete its analysis within the measurement period in accordance with SAB 118. The United Kingdom tax authority completed its examination of fiscal year 2016 income tax returns for the Company’s UK subsidiary during the three months ended April 30, 2018. As a result, the Company’s UK subsidiary is no longer subject to examination for fiscal years prior to 2017.

Net Loss Per Share

3 Months Ended

Apr. 30, 2018

Earnings Per Share [Abstract]

Net Loss Per Share

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



	Three Months Ended April 30,
	2018						2017
	Class A			Class B			Class A			Class B

	(unaudited)
Numerator:
Net loss ⁽¹⁾	$	(19,929	)	$	(6,033	)	$	(2,292	)	$	(25,414	)
Denominator:
Weighted-average shares outstanding - basic and diluted	79,988			24,215			3,291			36,492
Net loss per share attributable to common stockholders, basic and diluted:	$	(0.25	)	$	(0.25	)	$	(0.70	)	$	(0.70	)


⁽¹⁾	Net loss for the three months ended April 30, 2017 has been adjusted. See Note 2 for a summary of adjustments.

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):



	As of April 30,
	2018	2017

	(unaudited)
Unvested restricted common stock issued and outstanding	400	800
Stock options issued and outstanding	22,675	33,939
Unvested RSUs issued and outstanding	3,433	59
Unvested restricted stock awards issued and outstanding	388	599
Shares committed under the ESPP	1,062	1,040
Unvested shares subject to repurchase	139	439
	28,097	36,876

The Company expects to settle the principal amount of the 2023 Notes in cash, and therefore, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion option on diluted net income per share, if applicable. The conversion option 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 price of the 2023 Notes of $48.36 per share. During the three months ended April 30, 2018, the weighted average price per share of the Company’s Class A common stock was below the conversion price of the 2023 Notes.

Accounting Standards and Significant Accounting Policies (Policies)

3 Months Ended

Apr. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation

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

Principles of Consolidation

All intercompany balances and transactions have been eliminated in consolidation.

The condensed consolidated balance sheet as of January 31, 2018, included herein, was derived from the audited financial statements as of that date. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the balance sheet, statements of operations, statements of comprehensive loss and the statements of cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2019 or any future period.

Fiscal Period

The Company’s fiscal year ends on January 31. References to fiscal 2019, for example, refer to the fiscal year ending January 31, 2019.

Use of Estimates

The preparation of condensed 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 condensed 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 the 2023 Notes, valuation of deferred income tax assets and contingencies.

Revenue Recognition

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


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

Subscription Revenue

Professional Services Revenue

Contracts with Multiple Performance Obligations

Accounts Receivable and Allowances

Deferred Commissions

Convertible Senior Notes

Recently Adopted, Significant and Not Yet Adopted Accounting Pronouncements



	Three Months Ended April 30, 2017
	As Reported			Adjustments			As Adjusted
	(unaudited)
Revenue:
Subscription	$	48,357		$	(78	)	$	48,279
Professional services and other	4,650			(604		)	4,046
Total revenue	53,007			(682		)	52,325
Gross profit	35,544			(682		)	34,862
Operating expenses:
Sales and marketing	37,180			(1,877		)	35,303
Total operating expenses	64,178			(1,877		)	62,301
Loss before income taxes	(28,653		)	1,195			(27,458		)
Net loss	(28,901		)	1,195			(27,706		)
Net loss per share, basic and diluted	(0.73		)	0.03			(0.70		)

Select condensed consolidated balance sheet line items, which reflect the adoption of ASC 606, are as follows (in thousands):



	As of January 31, 2018
	As Reported			Adjustments			As Adjusted
	(unaudited)
Assets
Current assets:
Deferred commissions	$	16,481		$	1,274		$	17,755
Prepaid expenses and other current assets	16,973			808			17,781
Total current assets	315,416			2,082			317,498
Deferred commissions, noncurrent	10,971			29,784			40,755
Total assets	367,397			31,866			399,263

Liabilities and stockholders’ equity
Current liabilities:
Deferred revenue	$	162,633		$	(2,817	)	$	159,816
Total current liabilities	190,760			(2,817		)	187,943
Deferred revenue, noncurrent	6,034			(1,071		)	4,963
Total liabilities	203,811			(3,888		)	199,923
Accumulated deficit	(402,468		)	35,754			(366,714		)
Total stockholders’ equity	163,586			35,754			199,340
Total liabilities and stockholders’ equity	367,397			31,866			399,263

Significant Accounting Policies

Revenue Recognition

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


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

Subscription Revenue

Professional Services Revenue

Contracts with Multiple Performance Obligations

Accounts Receivable and Allowances

For the three months ended April 30, 2018 and 2017, write-offs were not material.

Deferred Commissions

Convertible Senior Notes

Recently Issued Accounting Pronouncements Not Yet Adopted

Accounting Standards and Significant Accounting Policies (Tables)

3 Months Ended

Apr. 30, 2018

Accounting Policies [Abstract]

Schedule of Impact of New Accounting Pronouncements



	Three Months Ended April 30, 2017
	As Reported			Adjustments			As Adjusted
	(unaudited)
Revenue:
Subscription	$	48,357		$	(78	)	$	48,279
Professional services and other	4,650			(604		)	4,046
Total revenue	53,007			(682		)	52,325
Gross profit	35,544			(682		)	34,862
Operating expenses:
Sales and marketing	37,180			(1,877		)	35,303
Total operating expenses	64,178			(1,877		)	62,301
Loss before income taxes	(28,653		)	1,195			(27,458		)
Net loss	(28,901		)	1,195			(27,706		)
Net loss per share, basic and diluted	(0.73		)	0.03			(0.70		)

Select condensed consolidated balance sheet line items, which reflect the adoption of ASC 606, are as follows (in thousands):



	As of January 31, 2018
	As Reported			Adjustments			As Adjusted
	(unaudited)
Assets
Current assets:
Deferred commissions	$	16,481		$	1,274		$	17,755
Prepaid expenses and other current assets	16,973			808			17,781
Total current assets	315,416			2,082			317,498
Deferred commissions, noncurrent	10,971			29,784			40,755
Total assets	367,397			31,866			399,263

Liabilities and stockholders’ equity
Current liabilities:
Deferred revenue	$	162,633		$	(2,817	)	$	159,816
Total current liabilities	190,760			(2,817		)	187,943
Deferred revenue, noncurrent	6,034			(1,071		)	4,963
Total liabilities	203,811			(3,888		)	199,923
Accumulated deficit	(402,468		)	35,754			(366,714		)
Total stockholders’ equity	163,586			35,754			199,340
Total liabilities and stockholders’ equity	367,397			31,866			399,263

Cash Equivalents and Short-Term Investments (Tables)

3 Months Ended

Apr. 30, 2018

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



	As of April 30, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value

	(unaudited)
Cash equivalents:
Money market funds	$	145,932	$	—	$	—		$	145,932
Commercial paper	9,972		—		—			9,972
U.S. treasury securities	9,995		—		—			9,995
Corporate debt securities	6,996		—		(1		)	6,995
Total cash equivalents	$	172,895	$	—	$	(1	)	$	172,894
Short-term investments:
Commercial paper	$	43,639	$	—	$	—		$	43,639
U.S. treasury securities	251,000		—		(270		)	250,730
Corporate debt securities	40,972		1		(57		)	40,916
Total short-term investments	335,611		1		(327		)	335,285
Total	$	508,506	$	1	$	(328	)	$	508,179



	As of January 31, 2018
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Cash equivalents:
Money market funds	$	90,770	$	—	$	—		$	90,770
Total cash equivalents	$	90,770	$	—	$	—		$	90,770
Short-term investments:
Commercial paper	$	15,946	$	—	$	—		$	15,946
U.S. treasury securities	61,896		—		(158		)	61,738
Corporate debt securities	24,125		—		(44		)	24,081
Total short-term investments	101,967		—		(202		)	101,765
Total	$	192,737	$	—	$	(202	)	$	192,535

Schedule of Contractual Maturities of Short-term Investments

The following tables present the contractual maturities of the Company’s short-term investments as of April 30, 2018 and January 31, 2018 (in thousands):



	As of April 30, 2018				As of January 31, 2018
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value

	(unaudited)
Due within one year	$	306,045	$	305,761	$	93,421	$	93,237
Due between one to five years	29,566		29,524		8,546		8,528
	$	335,611	$	335,285	$	101,967	$	101,765

Fair Value Measurements (Tables)

3 Months Ended

Apr. 30, 2018

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 and liabilities that are measured at fair value on a recurring basis using the above input categories (in thousands):



	As of April 30, 2018
	Level 1		Level 2		Level 3		Total

	(unaudited)
Assets:
Cash equivalents:
Money market funds	$	145,932	$	—	$	—	$	145,932
Commercial paper	—		9,972		—		9,972
U.S. treasury securities	—		9,995		—		9,995
Corporate debt securities	—		6,995		—		6,995
Total cash equivalents	$	145,932	$	26,962	$	—	$	172,894
Short-term investments:
Commercial paper	$	—	$	43,639	$	—	$	43,639
U.S. treasury securities	—		250,730		—		250,730
Corporate debt securities	—		40,916		—		40,916
Total short-term investments	—		335,285		—		335,285
Total cash equivalents and short-term investments	$	145,932	$	362,247	$	—	$	508,179



	As of January 31, 2018
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	90,770	$	—	$	—	$	90,770
Total cash equivalents	$	90,770	$	—	$	—	$	90,770
Short-term investments:
Commercial paper	$	—	$	15,946	$	—	$	15,946
U.S. treasury securities	—		61,738		—		61,738
Corporate debt securities	—		24,081		—		24,081
Total short-term investments	—		101,765		—		101,765
Total cash equivalents and short-term investments	$	90,770	$	101,765	$	—	$	192,535

Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note



	As of April 30, 2018
	Net Carrying Amount Before Unamortized Debt Issuance Costs		Estimated Fair Value

	(unaudited)
Convertible senior notes	$	267,418	$	394,680

Goodwill and Intangible Assets, net (Tables)

3 Months Ended

Apr. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets, net

Intangible assets consisted of the following (in thousands):



	As of April 30, 2018
	Gross		Accumulated Amortization			Write-offs		Net

	(unaudited)
Capitalized internal-use software costs	$	17,706	$	(6,282	)	$	—	$	11,424
Software licenses	1,023		(584		)	—		439
	$	18,729	$	(6,866	)	$	—	$	11,863



	As of January 31, 2018
	Gross		Accumulated Amortization			Write-offs			Net
Capitalized internal-use software costs	$	17,511	$	(5,172	)	$	(1,077	)	$	11,262
Software licenses	1,094		(558		)	(37		)	499
Purchased developed technology	570		(570		)	—			—
	$	19,175	$	(6,300	)	$	(1,114	)	$	11,761

Debt and Financing Arrangements (Tables)

3 Months Ended

Apr. 30, 2018

Debt Disclosure [Abstract]

Schedule of Interest Expense

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



	Three Months Ended April 30, 2018
	(unaudited)
Contractual interest expense	$	146
Amortization of debt issuance costs	190
Amortization of debt discount	2,381
Total	$	2,717

Schedule of Liability and Equity Component of 2023 Notes

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



	As of April 30, 2018
	(unaudited)
Liability component:
Principal	$	345,000
Less: unamortized debt issuance costs and debt discount	(85,080		)
Net carrying amount	$	259,920

	At Issuance
	(unaudited)
Equity component:
2023 Notes	$	79,962
Less: issuance costs	(2,320		)
Carrying amount of the equity component⁽¹⁾	$	77,642

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

Employee Incentive Plans (Tables)

3 Months Ended

Apr. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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 condensed consolidated statements of operations (in thousands):



	Three Months Ended April 30,
	2018		2017

	(unaudited)
Cost of revenue
Subscription	$	1,529	$	686
Professional services and other	889		469
Research and development	4,213		3,301
Sales and marketing	4,153		2,375
General and administrative	3,351		2,075
Total	$	14,135	$	8,906

Schedule of Shares of Common Stock Reserved for Future Issuance

Shares of common stock reserved for future issuance are as follows:



	As of
	April 30, 2018
	(unaudited)
Stock options and unvested RSUs outstanding	26,108,047
Available for future stock option and RSU grants	14,193,351
Available for ESPP	3,470,337
	43,771,735

Schedule of Stock Option Activity

A summary of the Company’s stock option activity and related information is 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, 2018	24,917,045		$	7.37	7.6	$	550,173
Granted	684,500		39.21
Exercised	(2,461,383	)	4.95
Canceled	(464,669	)	8.24
Outstanding as of April 30, 2018 (unaudited)	22,675,493		$	8.58	7.7	$	776,287
As of April 30, 2018
Vested and exercisable (unaudited)	9,285,314		$	5.81	6.9	$	343,540

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:



	Three Months Ended April 30,
	2018	2017

	(unaudited)
Expected volatility	40%	40% - 41%
Expected term (in years)	6.25	6.0 - 6.4
Risk-free interest rate	2.70%	2.06% - 2.21%
Expected dividend yield	—	—

Schedule of Nonvested Restricted Stock Units Activity

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



	Number of RSUs		Weighted- Average Grant Date Fair Value Per Share

Outstanding as of January 31, 2018	2,862,929		$	24.38
Granted	717,630		39.97
Vested	(58,825	)	17.00
Forfeited	(89,180	)	24.74
Outstanding as of April 30, 2018 (unaudited)	3,432,554		$	27.75

Net Loss Per Share (Tables)

3 Months Ended

Apr. 30, 2018

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):



	Three Months Ended April 30,
	2018						2017
	Class A			Class B			Class A			Class B

	(unaudited)
Numerator:
Net loss ⁽¹⁾	$	(19,929	)	$	(6,033	)	$	(2,292	)	$	(25,414	)
Denominator:
Weighted-average shares outstanding - basic and diluted	79,988			24,215			3,291			36,492
Net loss per share attributable to common stockholders, basic and diluted:	$	(0.25	)	$	(0.25	)	$	(0.70	)	$	(0.70	)


⁽¹⁾	Net loss for the three months ended April 30, 2017 has been adjusted. See Note 2 for a summary of adjustments.

Schedule of Potentially Dilutive Securities Excluded from Diluted Per Share Calculation

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



	As of April 30,
	2018	2017

	(unaudited)
Unvested restricted common stock issued and outstanding	400	800
Stock options issued and outstanding	22,675	33,939
Unvested RSUs issued and outstanding	3,433	59
Unvested restricted stock awards issued and outstanding	388	599
Shares committed under the ESPP	1,062	1,040
Unvested shares subject to repurchase	139	439
	28,097	36,876

Overview and Basis of Presentation - Narrative (Details) - USD ($)

3 Months Ended

Feb. 23, 2018

Apr. 07, 2017

Apr. 06, 2017

Apr. 30, 2018

Apr. 30, 2017

^[1]

Initial public offering costs

$ 0

$ 2,246,000

Class A Common Stock

Price per share in initial public offering (in dollars per share)

$ 17.00

Redeemable Convertible Preferred Stock

Redeemable convertible preferred stock converted to common class B stock (in shares)

59,491,640

Class B Common Stock

Common class B stock after conversion of redeemable convertible stock (in shares)

59,491,640

Initial Public Offering

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

$ 200,000,000

Initial public offering costs

$ 5,600,000

Initial Public Offering | Class A Common Stock

Shares issued in initial public offering (in shares)

12,650,000

Convertible Senior Notes Due 2023 | Senior Notes

Aggregate principal amount

$ 345,000,000.0

Fixed interest rate

0.25%

Gross proceeds from issuance of debt

$ 345,000,000

Issuance costs

$ 10,000,000

[1]	See Note 2 for a summary of adjustments.

Accounting Standards and Significant Accounting Policies - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized contract cost, amortization period	5 years
Capitalized contract costs	$ 5,600,000	$ 4,200,000
Amortization of capitalized contract costs	4,600,000	3,400,000
Capitalized contract cost, impairment loss	$ 0	$ 0
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
Calculated under Revenue Guidance in Effect before Topic 606 \| Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized contract cost, amortization period			1 year
Calculated under Revenue Guidance in Effect before Topic 606 \| Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized contract cost, amortization period			3 years

Accounting Standards and Significant Accounting Policies - Schedule of Impact of New Accounting Pronouncements (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

Apr. 30, 2018

Apr. 30, 2017

Jan. 31, 2018

Revenue:

$ 76,841

$ 48,279

^[1]

6,780

4,046

^[1]

83,621

52,325

^[1]

59,514

34,862

^[1]

49,493

35,303

^[1]

Loss before provision for (benefit from) income taxes

84,492

62,301

^[1]

(26,193)

(27,458)

^[1]

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

$ (25,962)

$ (27,706)

^[1],[2],[3]

$ (0.25)

$ (0.70)

^[1]

$ 18,551

$ 17,755

^[4]

20,203

17,781

^[4]

636,163

317,498

^[4]

41,077

40,755

^[4]

726,904

399,263

^[4]

173,548

159,816

^[4]

202,926

187,943

^[4]

4,346

4,963

^[4]

477,287

199,923

^[4]

(392,676)

(366,714)

^[4]

249,617

199,340

^[4]

$ 726,904

399,263

^[4]

As Reported

Revenue:

$ 48,357

4,650

53,007

35,544

37,180

Loss before provision for (benefit from) income taxes

64,178

(28,653)

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

$ (28,901)

$ (0.73)

16,481

16,973

315,416

10,971

367,397

162,633

190,760

6,034

203,811

(402,468)

163,586

Accounting Standards Update 2014-09 | Adjustments

367,397

Revenue:

$ (78)

(604)

(682)

(682)

(1,877)

Loss before provision for (benefit from) income taxes

(1,877)

1,195

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

$ 1,195

$ 0.03

1,274

808

2,082

29,784

31,866

(2,817)

(2,817)

(1,071)

(3,888)

35,754

35,754

Goodwill and Intangible Assets Disclosure [Abstract]

$ 31,866

[1]	See Note 2 for a summary of adjustments.
[2]	See Note 2 for a summary of adjustments.
[3]	See Note 2 for a summary of adjustments.
[4]	See Note 2 for a summary of adjustments.

Business Combination - Narrative (Details) - Stormpath Inc. $ in Millions	Feb. 17, 2017 USD ($) shares
Business Acquisition [Line Items]
Total purchase price	$ 3.7
Shares included in total consideration (in shares) \| shares	200,000
Restricted common stock
Business Acquisition [Line Items]
Incremental shares issued (in shares) \| shares	800,000
Incremental shares issued	$ 8.6
Stormpath Investors
Business Acquisition [Line Items]
Total purchase price	2.2
Stormpath Workforce
Business Acquisition [Line Items]
Total purchase price	1.5
Incremental shares issued	$ 9.1

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	Apr. 30, 2018	Jan. 31, 2018
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	$ 335,611	$ 101,967
Unrealized Gain	1	0
Unrealized Loss	(327)	(202)
Estimated Fair Value	335,285	101,765
Total Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	508,506	192,737
Unrealized Gain	1	0
Unrealized Loss	(328)	(202)
Estimated Fair Value	508,179	192,535
Commercial paper
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	43,639	15,946
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	43,639	15,946
U.S. treasury securities
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	251,000	61,896
Unrealized Gain	0	0
Unrealized Loss	(270)	(158)
Estimated Fair Value	250,730	61,738
Corporate debt securities
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	40,972	24,125
Unrealized Gain	1	0
Unrealized Loss	(57)	(44)
Estimated Fair Value	40,916	24,081
Cash Equivalents
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	172,895	90,770
Unrealized Gain	0	0
Unrealized Loss	(1)	0
Estimated Fair Value	172,894	90,770
Cash Equivalents \| Money market funds
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	145,932	90,770
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	145,932	$ 90,770
Cash Equivalents \| Commercial paper
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	9,972
Unrealized Gain	0
Unrealized Loss	0
Estimated Fair Value	9,972
Cash Equivalents \| U.S. treasury securities
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	9,995
Unrealized Gain	0
Unrealized Loss	0
Estimated Fair Value	9,995
Cash Equivalents \| Corporate debt securities
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	6,996
Unrealized Gain	0
Unrealized Loss	(1)
Estimated Fair Value	$ 6,995

Cash Equivalents and Short-Term Investments - Schedule of Contractual Maturities of Short-term Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Amortized Cost
Amortized cost, due within one year	$ 306,045	$ 93,421
Amortized cost, due between one to five years	29,566	8,546
Amortized cost, total	335,611	101,967
Estimated Fair Value
Estimated fair value, due within one year	305,761	93,237
Estimated fair value, due between one to five years	29,524	8,528
Estimated fair value, total	$ 335,285	$ 101,765

Cash Equivalents and Short-Term Investments - Narrative (Details)	3 Months Ended		12 Months Ended
	Apr. 30, 2018 USD ($) investment	Apr. 30, 2017 USD ($)	Jan. 31, 2018 USD ($) investment
Investments, Debt and Equity Securities [Abstract]
Number of short-term investments in unrealized loss positions \| investment	55		23
Gross unrealized gains or losses from available-for-sale securities	$ 0	$ 0
Realized gains or losses reclassified out of accumulated other comprehensive income	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	Apr. 30, 2018	Jan. 31, 2018
Assets:
Cash equivalents, fair value	$ 172,894	$ 90,770
Short term investments, fair value	335,285	101,765
Total cash equivalents and short-term investments	508,179	192,535
Level 1
Assets:
Cash equivalents, fair value	145,932	90,770
Short term investments, fair value	0	0
Total cash equivalents and short-term investments	145,932	90,770
Level 2
Assets:
Cash equivalents, fair value	26,962	0
Short term investments, fair value	335,285	101,765
Total cash equivalents and short-term investments	362,247	101,765
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
Commercial paper
Assets:
Short term investments, fair value	43,639	15,946
Commercial paper \| Level 1
Assets:
Short term investments, fair value	0	0
Commercial paper \| Level 2
Assets:
Short term investments, fair value	43,639	15,946
Commercial paper \| Level 3
Assets:
Short term investments, fair value	0	0
U.S. treasury securities
Assets:
Short term investments, fair value	250,730	61,738
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	250,730	61,738
U.S. treasury securities \| Level 3
Assets:
Short term investments, fair value	0	0
Corporate debt securities
Assets:
Short term investments, fair value	40,916	24,081
Corporate debt securities \| Level 1
Assets:
Short term investments, fair value	0	0
Corporate debt securities \| Level 2
Assets:
Short term investments, fair value	40,916	24,081
Corporate debt securities \| Level 3
Assets:
Short term investments, fair value	0	0
Money market funds
Assets:
Cash equivalents, fair value	145,932	90,770
Money market funds \| Level 1
Assets:
Cash equivalents, fair value	145,932	90,770
Money market funds \| Level 2
Assets:
Cash equivalents, fair value	0	0
Money market funds \| Level 3
Assets:
Cash equivalents, fair value	0	$ 0
Commercial paper
Assets:
Cash equivalents, fair value	9,972
Commercial paper \| Level 1
Assets:
Cash equivalents, fair value	0
Commercial paper \| Level 2
Assets:
Cash equivalents, fair value	9,972
Commercial paper \| Level 3
Assets:
Cash equivalents, fair value	0
U.S. treasury securities
Assets:
Cash equivalents, fair value	9,995
U.S. treasury securities \| Level 1
Assets:
Cash equivalents, fair value	0
U.S. treasury securities \| Level 2
Assets:
Cash equivalents, fair value	9,995
U.S. treasury securities \| Level 3
Assets:
Cash equivalents, fair value	0
Corporate debt securities
Assets:
Cash equivalents, fair value	6,995
Corporate debt securities \| Level 1
Assets:
Cash equivalents, fair value	0
Corporate debt securities \| Level 2
Assets:
Cash equivalents, fair value	6,995
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 - Convertible Senior Notes Due 2023 $ in Thousands	Apr. 30, 2018 USD ($)
Reported Value Measurement
Debt Instrument [Line Items]
Estimated Fair Value	$ 267,418
Estimate of Fair Value Measurement
Debt Instrument [Line Items]
Estimated Fair Value	$ 394,680

Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Thousands	Apr. 30, 2018 USD ($) $ / shares
Debt Instrument [Line Items]
Closing price of common stock (in dollars per share) \| $ / shares	$ 42.81
Convertible Senior Notes Due 2023 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount \| $	$ 345,000

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

3 Months Ended

Apr. 30, 2018

Apr. 30, 2017

Jan. 31, 2018

^[1]

Goodwill

$ 6,282,000

Goodwill impairments

$ 0

Capitalized internal-use software

1,300,000

1,400,000

Stock-based compensation included in capitalized software costs

200,000

Amortization expense

$ 1,200,000

$ 700,000

[1]	See Note 2 for a summary of adjustments.

Goodwill and Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross	$ 18,729	$ 19,175
Accumulated Amortization	(6,866)	(6,300)
Write-offs	0	(1,114)
Net	11,863	11,761
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Gross	17,706	17,511
Accumulated Amortization	(6,282)	(5,172)
Write-offs	0	(1,077)
Net	11,424	11,262
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross	1,023	1,094
Accumulated Amortization	(584)	(558)
Write-offs	0	(37)
Net	$ 439	499
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Gross		570
Accumulated Amortization		(570)
Write-offs		0
Net		$ 0

Deferred Revenue and Performance Obligations - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue recognized that was included in the contract liability balance	$ 64.6	$ 40.9
Unbilled receivables	$ 1.6		$ 0.8

Deferred Revenue and Performance Obligations - Performance Obligations (Details) $ in Millions	3 Months Ended
	Apr. 30, 2018 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue from remaining performance obligations	$ 499.1
Remaining performance obligation, percentage	56.00%
Performance obligations expected to be satisfied, expected timing	12 months

Debt and Financing Arrangements - Convertible Senior Notes (Details) - Senior Notes - Convertible Senior Notes Due 2023 $ / shares in Units, $ in Thousands	Feb. 27, 2018	Feb. 23, 2018 USD ($) day $ / shares	Apr. 30, 2018 USD ($)
Debt Instrument [Line Items]
Fixed interest rate		0.25%
Net proceeds from notes		$ 335,000
Initial conversion rate of common stock	0.0206795
Conversion price (in dollars per share) \| $ / shares		$ 48.36
Limitation on sale of common stock, sale price threshold, number of trading days \| day		20
Limitation on sale of common stock, sale price threshold, trading period \| day		30
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		5.68%
Issuance costs		$ 10,000	$ 10,000
Issuance costs attributable to liability component			7,700
Additional Paid-in Capital
Debt Instrument [Line Items]
Issuance costs attributable to equity component			$ 2,320

Debt and Financing Arrangements - Schedule of Interest Expense (Details) - Senior Notes - Convertible Senior Notes Due 2023 $ in Thousands	3 Months Ended
	Apr. 30, 2018 USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 146
Amortization of debt issuance costs	190
Amortization of debt discount	2,381
Total	$ 2,717

Debt and Financing Arrangements - Schedule of Liability and Equity Component of 2023 Notes (Details) - Senior Notes - Convertible Senior Notes Due 2023 $ in Thousands	Apr. 30, 2018 USD ($)
Liability component:
Principal	$ 345,000
Less: unamortized debt issuance costs and debt discount	(85,080)
Net carrying amount	259,920
Additional Paid-in Capital
Equity component:
2023 Notes	79,962
Less: issuance costs	(2,320)
Carrying amount of the equity component	$ 77,642

Debt and Financing Arrangements - Note Hedges and Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions

3 Months Ended

Feb. 27, 2018

Feb. 23, 2018

Apr. 30, 2018

Apr. 30, 2017

^[1]

Debt Instrument [Line Items]

Aggregate amount paid for cost of Note Hedge

$ 80,000

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

7.1

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

$ 68.06

Proceeds from issuance of warrants related to convertible notes

$ 52,400

$ 52,440

$ 0

Senior Notes | Convertible Senior Notes Due 2023

Debt Instrument [Line Items]

Shares issuable under warrants granted (in shares)

7.1

Conversion price (in dollars per share)

$ 48.36

[1]	See Note 2 for a summary of adjustments.

Debt and Financing Arrangements - Loan and Security Agreement (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Nov. 21, 2018	Jan. 31, 2018	Nov. 21, 2017	Nov. 21, 2016
Debt Instrument [Line Items]
Letters of credit issued and outstanding	$ 12,400,000		$ 12,200,000
Loan and Security Agreement \| Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Line of credit maximum borrowing capacity					$ 40,000,000
Letters of credit issued and outstanding	4,200,000
Available borrowing capacity	$ 35,800,000
Unused line of credit percentage fee	0.15%
Line of credit commitment fee				$ 100,000	$ 100,000
Draws on line of credit	$ 0		$ 0
Loan and Security Agreement \| Revolving Credit Facility \| Line of Credit \| Prime Rate
Debt Instrument [Line Items]
Line of credit interest rate	0.75%
Scenario, Forecast \| Loan and Security Agreement \| Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Line of credit commitment fee		$ 100,000

Commitments and Contingencies - Narrative (Details) - USD ($)

3 Months Ended

Apr. 30, 2018

Apr. 30, 2017

Jan. 31, 2018

Oct. 31, 2017

Other Commitments [Line Items]

Deferred rent

$ 9,000,000

$ 5,500,000

Rent expense

3,400,000

$ 2,200,000

Letters of credit issued and outstanding

12,400,000

$ 12,200,000

Restricted cash

8,565,000

$ 263,000

^[1]

Letter of Credit

Other Commitments [Line Items]

Draws on line of credit

$ 0

San Francisco - Ten Year Lease

Other Commitments [Line Items]

Restricted cash

$ 8,000,000

[1]	See Note 2 for a summary of adjustments.

- Definition

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.

+ References + Details

Employee Incentive Plans - Schedule of Stock-based Compensation Expense by Statement of Operations Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 14,135	$ 8,906
Subscription
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,529	686
Professional services and other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	889	469
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,213	3,301
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,153	2,375
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,351	$ 2,075

Employee Incentive Plans - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Feb. 17, 2017 USD ($) shares	Feb. 28, 2017 USD ($) shares	Apr. 30, 2018 USD ($) incentive_plan $ / shares shares	Apr. 30, 2017 USD ($) $ / shares	Jan. 31, 2018 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) \| shares			22,675,493		24,917,045
Weighted average grant date fair value of options granted (in dollars per share) \| $ / shares			$ 17.21	$ 5.36
Grant date fair value of vested stock options			$ 5.6	$ 4.6
Intrinsic value of options exercised			81.9	$ 14.1
Unrecognized stock-based compensation expense related to stock options			$ 58.0
Number of options, granted (in shares) \| shares			684,500
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period			3 years 4 months 24 days
Unrecognized compensation costs related to unvested restricted stock units			$ 81.8
Granted during period (in shares) \| shares			717,630
Vested during period (in shares) \| shares			58,825
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period			2 years 5 months 19 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period			2 months 12 days
Unrecognized compensation costs related to unvested restricted stock units			$ 1.5
Stormpath Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-combination service consideration	$ 3.7
Stormpath Inc. \| Restricted common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during period (in shares) \| shares	800,000
Shares issued fair value	$ 8.6
Stormpath Inc. \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period			9 months 18 days
Unrecognized compensation costs related to unvested restricted stock units			$ 1.7
Vested during period (in shares) \| shares			400,000
Stormpath Inc. \| Stormpath Workforce
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to stock options		$ 2.1	$ 1.5
Shares issued fair value	9.1
Pre-combination service consideration	$ 1.5
Stormpath Inc. \| Stormpath Workforce \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period			1 year 3 months 18 days
Unrecognized compensation costs related to unvested restricted stock units		5.5	$ 1.8
Granted during period (in shares) \| shares			598,500
Shares issued fair value		6.6
Vested during period (in shares) \| shares			210,850
Stormpath Inc. \| Stormpath Workforce \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period			2 years 2 months 12 days
Shares issued fair value		$ 2.5
Stock-based compensation vesting period		4 years
Number of options, granted (in shares) \| shares		518,900
Minimum \| Stormpath Inc. \| Stormpath Workforce \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation vesting period		2 years
Maximum \| Stormpath Inc. \| Stormpath Workforce \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation vesting period		3 years
2009 Stock Plan \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares) \| shares			21,910,897
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) \| shares			764,596

Employee Incentive Plans - Schedule of Common Stock Reserved for Future Issuance (Details)	Apr. 30, 2018 shares
Class of Stock [Line Items]
Common stock reserved for future issuance and options and unvested RSUs outstanding (in shares)	43,771,735
Stock Options And Restricted Stock Units
Class of Stock [Line Items]
Stock options and unvested RSUs outstanding (in shares)	26,108,047
Common stock, reserved for future issuance (in shares)	14,193,351
ESPP
Class of Stock [Line Items]
Common stock, reserved for future issuance (in shares)	3,470,337

Employee Incentive Plans - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018
Number of Options
Number of options, outstanding beginning of period (in shares)	24,917,045
Number of options, granted (in shares)	684,500
Number of options, exercised (in shares)	(2,461,383)
Number of options, canceled (in shares)	(464,669)
Number of options, outstanding end of period (in shares)	22,675,493	24,917,045
Vested and exercisable, number of options (in shares)	9,285,314
Weighted- Average Exercise Price
Options outstanding, weighted average exercise price beginning of period (in dollars per share)	$ 7.37
Options granted, weighted average exercise price (in dollars per share)	39.21
Options exercised, weighted average exercise price (in dollars per share)	4.95
Options canceled, weighted average exercise price (in dollars per share)	8.24
Options outstanding, weighted average exercise price end of period (in dollars per share)	8.58	$ 7.37
Vested and exercisable, weighted average exercise price (in dollars per share)	$ 5.81
Additional Disclosures
Options outstanding, weighted average remaining contractual term	7 years 8 months 5 days	7 years 7 months 21 days
Options outstanding, aggregate intrinsic value	$ 776,287	$ 550,173
Vested and exercisable, weighted average remaining contractual term	6 years 10 months 24 days
Vested and exercisable, aggregate intrinsic value	$ 343,540

Employee Incentive Plans - Schedule of Black-Scholes Option Pricing Model Estimated Fair Value Assumptions (Details) - Stock options	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate	40.00%
Expected volatility, minimum		40.00%
Expected volatility, maximum		41.00%
Expected term (in years)	6 years 3 months
Risk-free interest rate	2.70%
Risk-free interest rate, minimum		2.06%
Risk-free interest rate, maximum		2.21%
Expected dividend yield	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		6 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)		6 years 4 months 24 days

Employee Incentive Plans - Schedule of Restricted Stock Unit Activity (Details) - Restricted stock units	3 Months Ended
	Apr. 30, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning balance (in shares) \| shares	2,862,929
Granted during period (in shares) \| shares	717,630
Vested during period (in shares) \| shares	(58,825)
Forfeited during period (in shares) \| shares	(89,180)
Ending balance (in shares) \| shares	3,432,554
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share) \| $ / shares	$ 24.38
Granted during period (in dollars per share) \| $ / shares	39.97
Vested during period (in dollars per share) \| $ / shares	17.00
Forfeited during period (in dollars per share) \| $ / shares	24.74
Ending balance (in dollars per share) \| $ / shares	$ 27.75

Income Taxes - Narrative (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Apr. 30, 2018

Apr. 30, 2017

Jan. 31, 2018

Income Tax Disclosure [Abstract]

Tax (benefit) provision

$ (231)

$ 248

^[1]

Loss before income taxes

$ 26,193

$ 27,458

^[1]

Effective income tax rate

0.90%

(0.90%)

Deferred tax asset as a result of deductible temporary difference

$ 600

Reduction in deferred tax asset before valuation allowance due to change in tax rate

$ 61,000

[1]	See Note 2 for a summary of adjustments.

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

3 Months Ended

Apr. 30, 2018

Apr. 30, 2017

Numerator:

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

$ (25,962)

$ (27,706)

^[1],[2],[3]

Denominator:

104,203

39,783

^[1]

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

$ (0.25)

$ (0.70)

^[1]

Class A Common Stock

Numerator:

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

$ (19,929)

$ (2,292)

Denominator:

79,988

3,291

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

$ (0.25)

$ (0.70)

Class B Common Stock

Numerator: