0001660134-20-000026 | 10-Q | XBRL Viewer

Cover Page - shares	9 Months Ended
Cover Page - shares	Oct. 31, 2020	Nov. 30, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 31, 2020
Document Transition Report	false
Entity File Number	001-38044
Entity Registrant Name	Okta, Inc.
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	100 First Street, Suite 600
Entity Tax Identification Number	26-4175727
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	888
Local Phone Number	722-7871
Title of 12(b) Security	Class A common stock, par value $0.0001 per share
Trading Symbol	OKTA
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Entity Central Index Key	0001660134
Current Fiscal Year End Date	--01-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		121,216,396
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		8,249,686

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Current assets:
Cash and cash equivalents	$ 409,769	$ 520,048
Short-term investments	2,085,373	882,976
Accounts receivable, net of allowances of $2,547 and $1,166	139,473	130,115
Deferred commissions	40,908	33,636
Prepaid expenses and other current assets	82,016	32,950
Total current assets	2,757,539	1,599,725
Property and equipment, net	62,405	53,535
Operating lease right-of-use assets	154,699	125,204
Deferred commissions, noncurrent	94,305	77,874
Intangible assets, net	28,953	32,529
Goodwill	48,023	48,023
Other assets	24,355	18,505
Total assets	3,170,279	1,955,395
Current liabilities:
Accounts payable	5,114	3,837
Accrued expenses and other current liabilities	47,330	36,887
Accrued compensation	61,600	40,300
Convertible senior notes, net	35,131	100,703
Deferred revenue	424,765	365,236
Total current liabilities	573,940	546,963
Convertible senior notes, net, noncurrent	1,709,777	837,002
Operating lease liabilities, noncurrent	185,860	154,511
Deferred revenue, noncurrent	7,349	6,214
Other liabilities, noncurrent	12,705	5,361
Total liabilities	2,489,631	1,550,051
Commitments and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, par value $0.0001 per share; 100,000 shares authorized; no shares issued and outstanding as of October 31, 2020 and January 31, 2020	0	0
Additional paid-in capital	1,569,714	1,105,564
Accumulated other comprehensive income	2,571	892
Accumulated deficit	(891,650)	(701,124)
Total stockholders’ equity	680,648	405,344
Total liabilities and stockholders' equity	3,170,279	1,955,395
Class A Common Stock
Stockholders’ equity:
Common stock	12	11
Class B Common Stock
Stockholders’ equity:
Common stock	$ 1	$ 1

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Allowance for accounts receivable	$ 2,547	$ 1,166
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Class A Common Stock
Common stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	121,283,000	113,990,000
Common stock, shares outstanding (in shares)	121,283,000	113,990,000
Class B Common Stock
Common stock par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	8,219,000	8,648,000
Common stock, shares outstanding (in shares)	8,219,000	8,648,000

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenue:
Total revenue	$ 217,379	$ 153,037	$ 600,684	$ 418,740
Cost of revenue:
Total cost of revenue	56,908	40,824	156,541	114,699
Gross profit	160,471	112,213	444,143	304,041
Operating expenses:
Research and development	58,150	41,832	160,510	115,909
Sales and marketing	109,812	87,224	312,177	247,721
General and administrative	44,485	28,887	121,019	81,540
Total operating expenses	212,447	157,943	593,706	445,170
Operating loss	(51,976)	(45,730)	(149,563)	(141,129)
Interest expense	(22,368)	(7,826)	(50,063)	(16,371)
Interest income and other, net	1,878	4,982	10,737	11,346
Loss on early extinguishment and conversion of debt	(89)	(14,572)	(2,263)	(14,572)
Interest and other, net	(20,579)	(17,416)	(41,589)	(19,597)
Loss before provision for (benefit from) income taxes	(72,555)	(63,146)	(191,152)	(160,726)
Provision for (benefit from) income taxes	209	349	(626)	(2,285)
Net loss	$ (72,764)	$ (63,495)	$ (190,526)	$ (158,441)
Net loss per share, basic and diluted (in dollars per share)	$ (0.56)	$ (0.53)	$ (1.51)	$ (1.37)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	128,813	118,976	126,222	115,598
Subscription
Revenue:
Total revenue	$ 206,743	$ 144,517	$ 571,213	$ 394,174
Cost of revenue:
Total cost of revenue	44,762	30,124	121,420	82,581
Professional services and other
Revenue:
Total revenue	10,636	8,520	29,471	24,566
Cost of revenue:
Total cost of revenue	$ 12,146	$ 10,700	$ 35,121	$ 32,118

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (72,764)	$ (63,495)	$ (190,526)	$ (158,441)
Other comprehensive income (loss):
Net change in unrealized gains or losses on available-for-sale securities	(2,226)	227	1,344	616
Foreign currency translation adjustments	(724)	1,561	335	(162)
Other comprehensive income (loss)	(2,950)	1,788	1,679	454
Comprehensive loss	$ (75,714)	$ (61,707)	$ (188,847)	$ (157,987)

- Definition

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

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+ Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock and additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)
Beginning balance at Jan. 31, 2019		$ 744,907	$ (492,211)	$ (319)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net		46,911
Issuance of common stock for bonus settlement		2,809
Stock-based compensation		90,518
Equity component of convertible senior notes, net of issuance costs		217,347
Equity component of early extinguishment and conversion of convertible senior notes		(26,713)
Proceeds from hedges related to convertible senior notes		405,851
Payments for warrants related to convertible senior notes		(358,622)
Purchases of capped calls related to convertible senior notes		(74,094)
Other, net		(3)
Net loss	$ (158,441)		(158,441)
Other comprehensive income (loss)				454
Ending balance at Oct. 31, 2019	398,394	1,048,911	(650,652)	135
Beginning balance at Jul. 31, 2019		839,535	(587,157)	(1,653)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net		9,430
Issuance of common stock for bonus settlement		0
Stock-based compensation		36,180
Equity component of convertible senior notes, net of issuance costs		217,347
Equity component of early extinguishment and conversion of convertible senior notes		(26,713)
Proceeds from hedges related to convertible senior notes		405,851
Payments for warrants related to convertible senior notes		(358,622)
Purchases of capped calls related to convertible senior notes		(74,094)
Other, net		(3)
Net loss	(63,495)		(63,495)
Other comprehensive income (loss)				1,788
Ending balance at Oct. 31, 2019	398,394	1,048,911	(650,652)	135
Beginning balance at Jan. 31, 2020	405,344	1,105,576	(701,124)	892
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net		51,053
Issuance of common stock for bonus settlement		9,818
Stock-based compensation		140,895
Equity component of convertible senior notes, net of issuance costs		306,220
Equity component of early extinguishment and conversion of convertible senior notes		70,493
Proceeds from hedges related to convertible senior notes		195,046
Payments for warrants related to convertible senior notes		(175,399)
Purchases of capped calls related to convertible senior notes		(133,975)
Other, net
Net loss	(190,526)		(190,526)
Other comprehensive income (loss)				1,679
Ending balance at Oct. 31, 2020	680,648	1,569,727	(891,650)	2,571
Beginning balance at Jul. 31, 2020		1,498,562	(818,886)	5,521
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net		8,299
Issuance of common stock for bonus settlement		0
Stock-based compensation		54,049
Equity component of convertible senior notes, net of issuance costs		(12)
Equity component of early extinguishment and conversion of convertible senior notes		8,829
Proceeds from hedges related to convertible senior notes		0
Payments for warrants related to convertible senior notes		0
Purchases of capped calls related to convertible senior notes		0
Other, net		0
Net loss	(72,764)		(72,764)
Other comprehensive income (loss)				(2,950)
Ending balance at Oct. 31, 2020	$ 680,648	$ 1,569,727	$ (891,650)	$ 2,571

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Cash flows from operating activities:
Net loss	$ (190,526)	$ (158,441)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation	139,774	89,691
Depreciation, amortization and accretion	23,694	12,336
Amortization of debt discount and issuance costs	47,261	15,653
Amortization of deferred commissions	28,428	20,541
Deferred income taxes	(2,414)	(3,069)
Non-cash charitable contributions	4,662	1,162
Loss on early extinguishment and conversion of debt	2,263	14,572
Other, net	4,515	84
Changes in operating assets and liabilities:
Accounts receivable	(10,547)	(9,393)
Deferred commissions	(51,837)	(36,641)
Prepaid expenses and other assets	(6,794)	(1,518)
Operating lease right-of-use assets	13,979	7,851
Accounts payable	1,377	1,962
Accrued compensation	37,863	17,352
Accrued expenses and other liabilities	2,442	4,017
Operating lease liabilities	(11,750)	(4,128)
Deferred revenue	60,663	58,737
Net cash provided by operating activities	93,053	30,768
Cash flows from investing activities:
Capitalization of internal-use software costs	(3,530)	(2,659)
Purchases of property and equipment	(11,297)	(9,980)
Purchases of securities available for sale and other	(1,845,958)	(321,462)
Proceeds from maturities and redemption of securities available for sale	386,774	244,393
Proceeds from sales of securities available for sale and other	206,129	17,329
Purchases of intangible assets	0	(8,500)
Payments for business acquisition, net of cash acquired	0	(44,223)
Net cash used in investing activities	(1,267,882)	(125,102)
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes, net of issuance costs	1,134,841	1,040,760
Payments for repurchases of convertible senior notes	(447)	(224,414)
Proceeds from hedges related to convertible senior notes	195,046	405,851
Payments for warrants related to convertible senior notes	(175,399)	(358,622)
Purchases of capped calls related to convertible senior notes	(133,975)	(74,094)
Proceeds from stock option exercises	33,570	36,371
Proceeds from shares issued in connection with employee stock purchase plan	12,821	9,005
Other, net	0	(126)
Net cash provided by financing activities	1,066,457	834,731
Effects of changes in foreign currency exchange rates on cash, cash equivalents and restricted cash	121	(241)
Net increase (decrease) in cash, cash equivalents and restricted cash	(108,251)	740,156
Cash, cash equivalents and restricted cash at beginning of period	531,953	311,215
Cash, cash equivalents and restricted cash at end of period	423,702	1,051,371
Cash paid during the period for:
Interest	1,566	862
Income taxes	622	845
Non-cash activities:
Issuance of common stock for repurchases and conversions of convertible senior notes	307,910	380,406
Common stock issued as charitable contribution	4,662	1,162
Operating lease right-of-use assets exchanged for lease liabilities	45,490	14,957
Property and equipment acquired through tenant improvement allowance	4,811	1,682
Impairment of operating lease right-of-use asset	2,587	0
Issuance of common stock for bonus settlement	9,818	2,809
Reconciliation of cash, cash equivalents and restricted cash within the condensed consolidated balance sheets to the amounts shown in the condensed consolidated statements of cash flows above:
Total cash, cash equivalents and restricted cash	$ 423,702	$ 1,051,371

Overview and Basis of Presentation	9 Months Ended
Overview and Basis of Presentation	Oct. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Overview and Basis of Presentation	Overview and Basis of Presentation Description of Business Okta, Inc. (the Company) is the leading independent identity management platform for the enterprise. The Okta Identity Cloud enables the Company’s customers to securely connect people to technology, anywhere, anytime and from any device. The Company was incorporated in January 2009 as Saasure Inc., a California corporation, and was later reincorporated in April 2010 under the name Okta, Inc. as a Delaware corporation. The Company is headquartered in San Francisco, California. Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP). All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated balance sheet as of January 31, 2020, 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 results of operations for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2021 or any future period. The Company’s fiscal year ends on January 31. References to fiscal 2021, for example, refer to the fiscal year ending January 31, 2021. 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 6, 2020. 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 its convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation of deferred income tax assets, and the valuation of acquired intangible assets. In March 2020, the World Health Organization (WHO) declared the outbreak of the novel coronavirus (COVID-19) a pandemic, which continues to spread across the globe. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the condensed consolidated financial statements for the three and nine months ended October 31, 2020. As events continue to evolve and additional information becomes available, our assumptions and estimates may change materially in future periods.

Accounting Standards and Significant Accounting Policies	9 Months Ended
	Oct. 31, 2020
Accounting Policies [Abstract]
Accounting Standards and Significant Accounting Policies	Accounting Standards and Significant Accounting Policies 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, 2020. Except for the accounting policies for short-term investments and accounts receivable and allowances that were updated below as a result of adopting the Financial Accounting Standards Board’s (FASB) Accounting Standards Update (ASU) No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (ASU 2016-13) on February 1, 2020, there have been no significant changes to our significant accounting policies for the nine months ended October 31, 2020. Short-Term Investments The Company’s short-term investments comprise U.S. treasury securities and corporate debt securities. The Company determines the appropriate classification of its short-term investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its short-term investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, short-term investments, including securities with stated maturities beyond twelve months, are classified within current assets in the consolidated balance sheets. Available-for-sale securities are recorded at fair value each reporting period and are periodically evaluated for unrealized losses. For unrealized losses in securities that the Company intends to hold and will not more likely than not be required to sell before recovery, the Company further evaluates whether declines in fair value below amortized cost are due to credit or non-credit related factors. The Company considers credit related impairments to be changes in value that are driven by a change in the creditor’s ability to meet its payment obligations, and records an allowance and recognizes a corresponding loss in interest income and other, net when the impairment is incurred. Unrealized non-credit related losses and unrealized gains are reported as a separate component of accumulated other comprehensive loss in the condensed consolidated balance sheets until realized. Realized gains and losses are determined based on the specific identification method and are reported in interest income and other, net in the condensed consolidated statements of operations. Accounts Receivable and Allowances Accounts receivable are recorded at the invoiced amount, net of allowances. These allowances are based on the Company’s assessment of the collectibility of accounts by considering the age of each outstanding invoice, the collection history of each customer, and an evaluation of current expected risk of credit loss based on current conditions and reasonable and supportable forecasts of future economic conditions over the life of the receivable. We assess collectibility by reviewing accounts receivable on an aggregated basis where similar characteristics exist and on an individual basis when we identify specific customers with known disputes or collectibility issues. Amounts deemed uncollectible are recorded as an allowance in the condensed consolidated balance sheets with an offsetting decrease in deferred revenue or a charge to general and administrative expense in the condensed consolidated statements of operations. As of October 31, 2020, allowances reflect collectibility and concession concerns stemming from business and market disruption caused by COVID-19 and may fluctuate materially in future periods as the duration and severity of the impact of the COVID-19 pandemic remains uncertain. Concentrations of Significant Customers As of October 31, 2020, one channel partner represented approximately 13% of accounts receivable. As of January 31, 2020, no single customer represented greater than 10% of accounts receivable. For the nine months ended October 31, 2020 and 2019, no single customer represented greater than 10% of revenue. Recently Adopted Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, which changes the existing incurred loss impairment model for financial assets held at amortized cost. The new model uses a forward-looking expected loss method to calculate credit loss estimates. ASU 2016-13 also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. The Company adopted the requirements of ASU 2016-13 as of February 1, 2020 on a modified retrospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15), which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The Company adopted the requirements of ASU 2018-15 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (ASU 2019-12), as part of its Simplification Initiative to reduce the cost and complexity in accounting for income taxes. ASU 2019-12 removes certain exceptions related to the approach for intraperiod tax allocation and clarifies the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The guidance is effective for interim and annual periods beginning after December 15, 2020, with early adoption permitted. The Company early adopted ASU 2019-12 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In August 2020, the FASB issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (ASU 2020-06), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. Among other changes, ASU 2020-06 removes from GAAP the liability and equity separation model for convertible instruments with a cash conversion feature, and as a result, after adoption, entities will no longer separately present in equity an embedded conversion feature for such debt. Similarly, the embedded conversion feature will no longer be amortized into income as interest expense over the life of the instrument. Instead, entities will account for a convertible debt instrument wholly as debt unless (1) a convertible instrument contains features that require bifurcation as a derivative under ASC Topic 815, Derivatives and Hedging, or (2) a convertible debt instrument was issued at a substantial premium. Among other potential impacts, this change is expected to reduce reported interest expense, increase reported net income, and result in a reclassification of certain conversion feature balance sheet amounts from stockholders’ equity to liabilities as it relates to the Company’s convertible senior notes. Additionally, ASU 2020-06 requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share (EPS), which is consistent with the Company’s accounting treatment under the current standard. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, with early adoption permitted for fiscal years beginning after December 15, 2020, and can be adopted on either a fully retrospective or modified retrospective basis. The Company is currently evaluating the timing, method of adoption and overall impact of this standard on its consolidated financial statements.

Business Combinations	9 Months Ended
Business Combinations	Oct. 31, 2020
Business Combinations [Abstract]
Business Combinations	Business Combinations On March 18, 2019, the Company acquired all issued and outstanding capital stock of Azuqua, Inc. (Azuqua), a company which provides a no-code, cloud-based integration platform that automates workflows between applications and services. The acquisition date cash consideration transferred for Azuqua was $44.2 million, net of $1.1 million in cash acquired. The Company recorded $15.7 million for developed technology intangible assets with an estimated useful life of five years and recorded $29.9 million of goodwill which is primarily attributed to the assembled workforce as well as the integration of Azuqua’s technology and the Company’s technology. The Company incurred $3.0 million of acquisition-related costs, which were recorded as general and administrative expense in the quarter ended April 30, 2019. In connection with Azuqua and prior acquisitions, the Company entered into deferred compensation arrangements totaling $10.8 million, of which $2.6 million was recognized as compensation during the nine months ended October 31, 2020. The remaining deferred compensation balance of $2.2 million is associated with the acquisition of Azuqua and is being recognized over a future period of 1.4 years subject to continued service with the Company. These acquisitions did not have a material impact on the Company’s condensed consolidated financial statements; therefore, historical and proforma disclosures have not been presented.

Cash Equivalents and Short-term Investments

9 Months Ended

Oct. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Cash Equivalents and Short-term Investments

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


	As of October 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
	(unaudited)
Cash equivalents:
Money market funds	$	335,592	$	—	$	—	$	335,592



Total cash equivalents	335,592		—		—		335,592
Short-term investments:


U.S. treasury securities	1,795,309		1,978		(130)		1,797,157
Corporate debt securities	287,523		722		(29)		288,216
Total short-term investments	2,082,832		2,700		(159)		2,085,373
Total	$	2,418,424	$	2,700	$	(159)	$	2,420,965


	As of January 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	416,584	$	—	$	—	$	416,584

U.S. treasury securities	19,996		—		—		19,996

Total cash equivalents	436,580		—		—		436,580
Short-term investments:


U.S. treasury securities	575,920		686		(8)		576,598
Corporate debt securities	305,859		519		—		306,378
Total short-term investments	881,779		1,205		(8)		882,976
Total	$	1,318,359	$	1,205	$	(8)	$	1,319,556

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

The following table presents the contractual maturities of the Company’s short-term investments as of October 31, 2020 (in thousands):


	As of October 31, 2020
	Amortized Cost		Estimated Fair Value
	(unaudited)
Due within one year	$	1,285,936	$	1,288,279
Due between one to five years	796,896		797,094
Total	$	2,082,832	$	2,085,373

As of October 31, 2020 and January 31, 2020, the Company included $41.0 million and nil, respectively, of unsettled maturities of Short-term investments in Prepaid expenses and other current assets.

The Company included $10.9 million and $5.7 million of interest receivable in Prepaid expenses and other current assets as of October 31, 2020 and January 31, 2020, respectively. The Company did not recognize an allowance for credit losses against interest receivable as of October 31, 2020 and January 31, 2020 because such potential losses were not material.

The Company had 62 and 7 short-term investments in unrealized loss positions as of October 31, 2020 and January 31, 2020, respectively. There were no material gross unrealized gains or losses from available-for-sale securities and no material realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the three and nine months ended October 31, 2020 or 2019.

For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) the Company has the intention to sell any of these investments, (ii) it is not more likely than not that the Company will be required to sell any of these available-for-sale debt securities before recovery of the entire amortized cost basis and (iii) the decline in the fair value of the investment is due to credit or non-credit related factors. Based on this evaluation, the Company determined that for short-term investments, there were no material credit or non-credit related impairments as of October 31, 2020 and January 31, 2020.

Fair Value Measurements

9 Months Ended

Oct. 31, 2020

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 other inputs that are directly or indirectly observable in the marketplace.

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

Assets and Liabilities Measured at Fair Value on a Recurring Basis

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


	As of October 31, 2020
	Level 1		Level 2		Level 3		Total
	(unaudited)
Assets:
Cash equivalents:
Money market funds	$	335,592	$	—	$	—	$	335,592



Total cash equivalents	335,592		—		—		335,592
Short-term investments:


U.S. treasury securities	—		1,797,157		—		1,797,157
Corporate debt securities	—		288,216		—		288,216
Total short-term investments	—		2,085,373		—		2,085,373
Total cash equivalents and short-term investments	$	335,592	$	2,085,373	$	—	$	2,420,965


	As of January 31, 2020
	Level 1		Level 2		Level 3		Total

Assets:
Cash equivalents:
Money market funds	$	416,584	$	—	$	—	$	416,584

U.S. treasury securities	—		19,996		—		19,996

Total cash equivalents	416,584		19,996		—		436,580
Short-term investments:


U.S. treasury securities	—		576,598		—		576,598
Corporate debt securities	—		306,378		—		306,378
Total short-term investments	—		882,976		—		882,976
Total cash equivalents and short-term investments	$	416,584	$	902,972	$	—	$	1,319,556

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 October 31, 2020
	Net Carrying Amount (1)		Estimated Fair Value
	(unaudited)
2023 convertible senior notes	$	35,614	$	182,234
2025 convertible senior notes	$	876,852	$	1,393,052
2026 convertible senior notes	$	856,489	$	1,316,750

(1) Before unamortized debt issuance costs.

The principal amounts of the 2023 convertible senior notes (2023 Notes), the 2025 convertible senior notes (2025 Notes), and the 2026 convertible senior notes (2026 Notes, and together with the 2023 Notes and 2025 Notes, the Notes) are $40.2 million, $1,060.0 million, and $1,150.0 million, respectively. The difference between the principal amounts and the respective net carrying amounts, before unamortized debt issuance costs, represents the unamortized debt discount (See Note 9 for additional details). The estimated fair values of the Notes, which are Level 2 financial instruments, were determined based on the quoted bid prices of the Notes in an over-the-counter market on the last trading day of the reporting period. As of October 31, 2020, the difference between the net carrying amount of the Notes and their estimated fair values represented the equity conversion value premium the market assigned to the Notes. Based on the closing price of our common stock of $209.83 on October 31, 2020, the if-converted values of the 2023 Notes and 2025 Notes exceeded the principal amounts of $40.2 million and $1,060.0 million, respectively, while the if-converted value of the 2026 Notes was less than the principal amount of $1,150.0 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

Deferred Commissions	9 Months Ended
Deferred Commissions	Oct. 31, 2020
Revenue from Contract with Customer [Abstract]
Deferred Commissions	Deferred CommissionsSales commissions capitalized as contract costs totaled $21.5 million and $15.3 million in the three months ended October 31, 2020 and 2019, respectively, and $51.8 million and $36.7 million in the nine months ended October 31, 2020 and 2019, respectively. Amortization of contract costs was $10.3 million and $7.3 million for the three months ended October 31, 2020 and 2019, respectively, and $28.4 million and $20.5 million for the nine months ended October 31, 2020 and 2019, respectively. There was no impairment loss in relation to the costs capitalized.Deferred Revenue and Performance Obligations Deferred Revenue Deferred revenue, which is a contract liability, consists primarily of payments received and accounts receivable recorded in advance of revenue recognition under the Company’s contracts with customers and is recognized as the revenue recognition criteria are met. Subscription revenue recognized during the three months ended October 31, 2020 and 2019 that was included in the deferred revenue balances at the beginning of the respective periods was $174.0 million and $123.5 million, respectively, and $334.2 million and $224.0 million in the nine months ended October 31, 2020 and 2019, respectively. Professional services and other revenue recognized in the three and nine months ended October 31, 2020 and 2019 from deferred revenue balances at the beginning of the respective periods was not material. Transaction Price Allocated to the Remaining Performance Obligations Transaction price allocated to the remaining performance obligations represents all future, noncancelable contracted revenue that has not yet been recognized, inclusive of deferred revenue that has been invoiced and noncancelable amounts that will be invoiced and recognized as revenue in future periods. As of October 31, 2020, total remaining noncancelable performance obligations under the Company’s subscription contracts with customers was approximately $1,581.8 million. Of this amount, the Company expects to recognize revenue of approximately $753.2 million, or 48%, over the next 12 months, with the balance to be recognized as revenue thereafter. Revenue from remaining performance obligations for professional services and other contracts as of October 31, 2020 was not material.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

Goodwill and Intangible Assets, net

9 Months Ended

Oct. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets, net

Goodwill

As of October 31, 2020 and January 31, 2020, goodwill was $48.0 million. No goodwill impairments were recorded during the three and nine months ended October 31, 2020 and 2019.

Intangible Assets, net

Intangible assets consisted of the following (in thousands):


	As of October 31, 2020
	Gross		Accumulated Amortization		Write-offs		Net
	(unaudited)
Capitalized internal-use software costs	$	29,435	$	(18,199)	$	—	$	11,236
Purchased developed technology	28,800		(11,101)		—		17,699
Software licenses	1,112		(1,094)		—		18
	$	59,347	$	(30,394)	$	—	$	28,953


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

The Company capitalized $1.6 million and $1.8 million of internal-use software costs in the three months ended October 31, 2020 and 2019, respectively and $4.7 million and $3.5 million in the nine months ended October 31, 2020 and 2019, respectively. Stock-based compensation expense included in the total amounts capitalized were immaterial.

The remaining weighted-average useful life of all purchased developed technology was 3.3 years as of October 31, 2020.

Amortization expense of intangible assets for the three months ended October 31, 2020 and 2019 was $2.7 million and $2.6 million, respectively, and $8.2 million and $7.7 million for the nine months ended October 31, 2020 and 2019, respectively.

Deferred Revenue and Performance Obligations	9 Months Ended
Deferred Revenue and Performance Obligations	Oct. 31, 2020
Revenue from Contract with Customer [Abstract]
Deferred Revenue and Performance Obligations	Deferred CommissionsSales commissions capitalized as contract costs totaled $21.5 million and $15.3 million in the three months ended October 31, 2020 and 2019, respectively, and $51.8 million and $36.7 million in the nine months ended October 31, 2020 and 2019, respectively. Amortization of contract costs was $10.3 million and $7.3 million for the three months ended October 31, 2020 and 2019, respectively, and $28.4 million and $20.5 million for the nine months ended October 31, 2020 and 2019, respectively. There was no impairment loss in relation to the costs capitalized.Deferred Revenue and Performance Obligations Deferred Revenue Deferred revenue, which is a contract liability, consists primarily of payments received and accounts receivable recorded in advance of revenue recognition under the Company’s contracts with customers and is recognized as the revenue recognition criteria are met. Subscription revenue recognized during the three months ended October 31, 2020 and 2019 that was included in the deferred revenue balances at the beginning of the respective periods was $174.0 million and $123.5 million, respectively, and $334.2 million and $224.0 million in the nine months ended October 31, 2020 and 2019, respectively. Professional services and other revenue recognized in the three and nine months ended October 31, 2020 and 2019 from deferred revenue balances at the beginning of the respective periods was not material. Transaction Price Allocated to the Remaining Performance Obligations Transaction price allocated to the remaining performance obligations represents all future, noncancelable contracted revenue that has not yet been recognized, inclusive of deferred revenue that has been invoiced and noncancelable amounts that will be invoiced and recognized as revenue in future periods. As of October 31, 2020, total remaining noncancelable performance obligations under the Company’s subscription contracts with customers was approximately $1,581.8 million. Of this amount, the Company expects to recognize revenue of approximately $753.2 million, or 48%, over the next 12 months, with the balance to be recognized as revenue thereafter. Revenue from remaining performance obligations for professional services and other contracts as of October 31, 2020 was not material.

- Definition

+ References

+ Details

Convertible Senior Notes, Net

9 Months Ended

Oct. 31, 2020

Debt Disclosure [Abstract]

Convertible Senior Notes, Net

2023 Convertible Senior Notes

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

In September 2019, the Company used part of the net proceeds from the issuance of the 2025 Notes to repurchase a portion of the 2023 Notes, which consisted of a repurchase of $224.4 million aggregate principal amount of the 2023 Notes in privately-negotiated transactions, for aggregate consideration of $604.8 million, consisting of approximately $224.4 million in cash and approximately 3.0 million shares of Class A common stock (First Partial Repurchase of 2023 Notes). The $604.8 million in aggregate consideration was allocated between the debt and equity components in the amounts of $197.7 million and $407.1 million respectively, using an effective interest rate of 4.00% to determine the fair value of the liability component. As of the repurchase date, the carrying value of the notes subject to the First Partial Repurchase of 2023 Notes, net of unamortized debt discount and issuance costs, was $183.1 million. The First Partial Repurchase of 2023 Notes resulted in a $14.6 million loss on early debt extinguishment during the three and nine months ended October 31, 2019, of which $3.8 million consisted of unamortized debt issuance costs.

In June 2020, the Company used part of the net proceeds from the issuance of the 2026 Notes to repurchase a portion of the 2023 Notes, which consisted of a repurchase of $69.9 million aggregate principal amount of the 2023 Notes in privately-negotiated transactions, for aggregate consideration of $260.5 million, consisting of approximately $0.2 million in cash and approximately 1.4 million shares of Class A common stock (Second Partial Repurchase of 2023 Notes, and together with the First Partial Repurchase of 2023 Notes, the 2023 Notes Partial Repurchases). The $260.5 million in aggregate consideration was allocated between the debt and equity components in the amounts of $61.8 million and $198.7 million respectively, using an effective interest rate of 4.90% to determine the fair value of the liability component. As of the repurchase date, the carrying value of the notes subject to the Second Partial Repurchase of 2023 Notes, net of unamortized debt discount and issuance costs, was $59.6 million. The Second Partial Repurchase of 2023 Notes resulted in a $2.2 million loss on early debt extinguishment during the nine months ended October 31, 2020, of which $1.0 million consisted of unamortized debt issuance costs.

The interest rates used in the 2023 Notes Partial Repurchases were based on the income and market based approaches used to determine the effective interest rate of the 2025 Notes and 2026 Notes, adjusted for the remaining tenor of the 2023 Notes. As of October 31, 2020, $40.2 million of principal remained outstanding on the 2023 Notes.

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

The 2023 Notes are convertible at an initial conversion rate of 20.6795 shares of Class A common stock per $1,000 principal amount of the 2023 Notes, which is equal to an initial conversion price of approximately $48.36 per share of Class A common stock, subject to adjustment under certain circumstances in accordance with the terms of the 2023 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 2023 Indenture.

On or after October 15, 2022 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2023 Notes regardless of the foregoing circumstances. For at least twenty trading days during the period of thirty consecutive trading days ended October 31, 2020, the last reported sale price of the Company’s common stock was equal to or exceeded 130% of the conversion price of the 2023 Notes on each applicable trading day. As a result, the 2023 Notes are convertible at the option of the holders during the fiscal quarter ending January 31, 2021 and were classified as current liabilities on the condensed consolidated balance sheet as of October 31, 2020.

During the three and nine months ended October 31, 2020, the Company paid approximately $0.3 million in cash and issued approximately 0.2 million shares of Class A common stock to settle approximately $10.4 million principal amount of 2023 Notes (not in connection with the 2023 Notes Partial Repurchases). The loss on early note conversion was not material. No requests to convert material amounts of notes are currently outstanding.

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


	Three Months Ended October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Contractual interest expense	$	27	$	99	$	154	$	530
Amortization of debt issuance costs	49		214		266		862
Amortization of debt discount	511		2,403		2,839		9,868
Total	$	587	$	2,716	$	3,259	$	11,260

Total initial 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 initially 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 October 31, 2020
	(unaudited)
Liability component:
Principal	$	40,246
Less: unamortized debt issuance costs and debt discount	(5,115)
Net carrying amount	$	35,131

	As of October 31, 2020
	(unaudited)
Equity component:
2023 Notes	$	9,328
Less: issuance costs	(271)
Carrying amount of the equity component(1)	$	9,057

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

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

In September 2019 and in June 2020, and in connection with the First Partial Repurchase of 2023 Notes and Second Partial Repurchase of 2023 Notes, the Company terminated Note Hedges corresponding to approximately 4.6 million and 1.4 million shares for cash proceeds of $405.9 million and $195.0 million, respectively. The proceeds were recorded as an increase to Additional paid-in capital in the condensed consolidated balance sheets.

During the three months ended October 31, 2020, the Company exercised a portion of the Note Hedges, corresponding to approximately $10.4 million principal amount of 2023 Notes, which will be net share settled in our fiscal fourth quarter in accordance with their contractual terms. As of October 31, 2020, Note Hedges giving the Company the option to purchase approximately 0.8 million shares (subject to adjustment), which excludes the exercised portion to be net share settled in our fiscal fourth quarter, remained outstanding.

Warrants

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

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

In September 2019 and in June 2020, and in connection with the First Partial Repurchase of 2023 Notes and Second Partial Repurchase of 2023 Notes, the Company terminated Warrants corresponding to approximately 4.6 million and 1.4 million shares for total cash payments of $358.6 million and $175.4 million, respectively. The termination payments were recorded as a decrease to Additional paid-in capital in the condensed consolidated balance sheets.

As of October 31, 2020, Warrants to acquire up to approximately 1.0 million shares (subject to adjustment) remained outstanding.

2025 Convertible Senior Notes

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

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

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

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

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

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

•upon the occurrence of specified corporate events, as described in the 2025 Indenture.

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

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

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

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


	Three Months Ended October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Contractual interest expense	$	332	$	188	$	994	$	188
Amortization of debt issuance costs	530		275		1,554		275
Amortization of debt discount	8,526		4,649		25,320		4,649
Total	$	9,388	$	5,112	$	27,868	$	5,112

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

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


	As of October 31, 2020
	(unaudited)
Liability component:
Principal	$	1,060,000
Less: unamortized debt issuance costs and debt discount	(196,126)
Net carrying amount	$	863,874

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

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

2025 Capped Calls

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

The Company paid an aggregate amount of $74.1 million for the 2025 Capped Calls. The amount paid for the 2025 Capped Calls was recorded as a reduction to Additional paid-in capital in the condensed consolidated balance sheets.

2026 Convertible Senior Notes

The 2026 Notes are senior, unsecured obligations of the Company, and bear interest at a fixed rate of 0.375% per year. Interest is payable in cash semi-annually in arrears on June 15 and December 15 of each year, beginning on December 15, 2020. The 2026 Notes mature on June 15, 2026 unless earlier redeemed, repurchased or converted. The total net proceeds from the 2026 Notes, after deducting initial purchasers’ discounts and debt issuance costs, were $1,134.8 million.

The terms of the 2026 Notes are governed by an Indenture by and between the Company and Wilmington Trust, National Association, as Trustee (the 2026 Indenture, and together with the 2023 Indenture and 2025 Indenture, the Indentures). Upon conversion, the 2026 Notes may be settled in cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at the Company’s election.

The 2026 Notes are convertible at an initial conversion rate of 4.1912 shares of Class A common stock per $1,000 principal amount of the 2026 Notes, which is equal to an initial conversion price of approximately $238.60 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 March 15, 2026, holders of the 2026 Notes may convert all or a portion of their 2026 Notes only in multiples of $1,000 principal amount, under the following circumstances:

•during any fiscal quarter commencing after the fiscal quarter ending on October 31, 2020 (and only during such fiscal quarter), if the last reported sale price of our 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 2026 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 2026 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 our Class A common stock and the conversion rate on such trading day;

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

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

On or after March 15, 2026 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 2026 Notes regardless of the foregoing circumstances. During the three months ended October 31, 2020, the conditions allowing holders of the 2026 Notes to convert were not met.

The Company may redeem for cash all or any portion of the 2026 Notes, at its option, on or after June 20, 2023, if the last reported sale price of the Company’s Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive), including the trading day

immediately preceding the date on which we provide notice of redemption, during any 30 consecutive trading day period ending on and including the trading day preceding the date on which we provide notice of redemption price equal to 100% of the principal amount of the notes to be redeemed, plus any accrued and unpaid interest to, but excluding, the redemption date. During the three months ended October 31, 2020, the Company did not redeem any of the 2026 Notes.

Holders of the 2026 Notes who convert their 2026 Notes in connection with certain corporate events that constitute a make-whole fundamental change (as defined in the Indenture) or in connection with the Company’s issuance of a redemption notice are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a fundamental change (as defined in the Indenture), holders of the 2026 Notes may require the Company to repurchase all or a portion of their 2026 Notes at a price equal to 100% of the principal amount of the 2026 Notes being repurchased, plus any accrued and unpaid interest.

In accounting for the issuance of the 2026 Notes, the Company separated the 2026 Notes into liability and equity components using an effective interest rate of 5.75% to determine the fair value of the liability component. This interest rate was based on both an income and a market based approach. For the income approach, the Company used a convertible bond pricing model, which included several assumptions including volatility, the risk-free rate and observable trading activity for the Company’s existing Notes. For the market approach, the Company performed an evaluation of issuances of debt securities without conversion features by other companies with similar credit risk ratings at the time of issuance. The following table sets forth total interest expense recognized related to the 2026 Notes (in thousands):


	Three Months Ended	Nine Months Ended
		October 31, 2020
		(unaudited)
Contractual interest expense		$	1,078	$	1,653
Amortization of debt issuance costs		318		483
Amortization of debt discount		10,997		16,799
Total		$	12,393	$	18,935

Total issuance costs of $15.2 million related to the 2026 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 2026 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 $11.0 million and equity issuance costs of $4.1 million.

The 2026 Notes, net consisted of the following (in thousands):


	As of October 31, 2020
	(unaudited)
Liability component:
Principal	$	1,150,000
Less: unamortized debt issuance costs and debt discount	(304,097)
Net carrying amount	$	845,903

	At Issuance
	(unaudited)
Equity component:
2026 Notes	$	310,311
Less: issuance costs	(4,090)
Carrying amount of the equity component(1)	$	306,221

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

2026 Capped Calls

In connection with the pricing of the 2026 Notes, the Company entered into capped call transactions with respect to its Class A common stock (2026 Capped Calls). The 2026 Capped Calls are purchased call options that give the Company the option to purchase, subject to anti-dilution adjustments substantially identical to those in the 2026 Notes, approximately 4.8 million shares of its Class A common stock for approximately $238.60 per share (subject to adjustment), corresponding to the approximate initial conversion price of the 2026 Notes, exercisable upon conversion of the 2026 Notes. The 2026 Capped Calls have initial cap prices of $360.14 per share (subject to adjustment) and will expire in 2026, if not exercised earlier. The 2026 Capped Calls are intended to offset potential dilution to the Company’s Class A common stock and/or offset the potential cash payments that the Company could be required to make in excess of the principal amount upon any conversion of the 2026 Notes under certain circumstances. The 2026 Capped Calls are separate transactions and are not part of the terms of the 2026 Notes.

The Company paid an aggregate amount of $134.0 million for the 2026 Capped Calls. The amount paid for the 2026 Capped Calls was recorded as a reduction to Additional paid-in capital in the consolidated balance sheets.

Leases

9 Months Ended

Oct. 31, 2020

Leases [Abstract]

Leases

The Company has entered into various non-cancelable office space operating leases with original lease periods expiring between 2021 and 2028. These leases do not contain material variable rent payments, residual value guarantees, covenants or other restrictions.

Operating lease costs were as follows (in thousands):


	Three Months Ended October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Operating lease cost(1)	$	8,554	$	5,882	$	24,258	$	16,965

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

The weighted-average remaining term of the Company’s operating leases was 7.1 and 7.9 years and the weighted-average discount rate used to measure the present value of the operating lease liabilities was 5.6% and 5.7% as of October 31, 2020 and January 31, 2020, respectively.

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


	Operating Leases
	(unaudited)
2021	$	5,475
2022	37,094
2023	37,758
2024	38,655
2025	36,111
Thereafter	99,860
Total lease payments	254,953
Less imputed interest	(47,078)

Total operating lease liabilities	$	207,875

Cash payments included in the measurement of the Company’s operating lease liabilities were $7.7 million and $6.1 million for the three months ended October 31, 2020 and 2019, respectively, and $22.7 million and $10.9 million for the nine months ended October 31, 2020 and 2019, respectively.

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Oct. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit In conjunction with the execution of certain office space operating leases, letters of credit in the aggregate amount of $11.2 million and $11.9 million were issued and outstanding as of October 31, 2020 and January 31, 2020, respectively. No draws have been made under such letters of credit. 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 October 31, 2020.

Employee Incentive Plans

9 Months Ended

Oct. 31, 2020

Share-based Payment Arrangement [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 October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Cost of revenue
Subscription	$	6,090	$	3,604	$	15,229	$	9,137
Professional services and other	2,113		1,900		5,924		5,292
Research and development	17,546		10,894		44,434		26,322
Sales and marketing	14,368		10,937		38,693		26,959
General and administrative	13,535		8,400		35,494		21,984
Total	$	53,652	$	35,735	$	139,774	$	89,694

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 and nine months ended October 31, 2020 and 2019.

Equity Incentive Plans

The Company has two equity incentive plans: the 2009 Stock Plan (2009 Plan) and the 2017 Equity Incentive Plan (2017 Plan). All shares that remain available for future grants are under the 2017 Plan. As of October 31, 2020, options to purchase 1,176,642 shares of Class A common stock and 8,065,566 shares of Class B common stock remained outstanding.

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


			As of
			October 31, 2020
			(unaudited)
Stock options and unvested RSUs outstanding			14,069,326
Available for future stock option and RSU grants			20,720,051
Available for ESPP			4,752,501
			39,541,878

Stock Options

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


	Number of Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 2020	12,359,302	$	11.82	6.2	$	1,436,487
Granted	402,891	145.08
Exercised	(3,383,144)	9.92
Canceled	(136,841)	19.62
Outstanding as of October 31, 2020 (unaudited)	9,242,208	$	18.21	5.8	$	1,770,981
As of October 31, 2020

Vested and exercisable (unaudited)	7,429,026	$	9.87	5.4	$	1,485,523

As of October 31, 2020, there was a total of $36.2 million of unrecognized stock-based compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 1.5 years.

Restricted Stock Units

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


	Number of RSUs	Weighted- Average Grant Date Fair Value Per Share
Outstanding as of January 31, 2020	4,893,241	$	77.99
Granted	1,960,358	164.64
Vested	(1,667,917)	79.28
Forfeited	(358,564)	84.64
Outstanding as of October 31, 2020 (unaudited)	4,827,118	$	112.24

As of October 31, 2020, there was $501.8 million of unrecognized stock-based compensation expense related to unvested RSUs, which is expected to be recognized over a weighted-average period of 2.6 years based on vesting under the award service conditions.

Employee Stock Purchase Plan

The ESPP provides for 12-month offering periods beginning June 21 and December 21 of each year, and each offering period consists of up to two six-month purchase periods.

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


	Three Months Ended October 31,		Nine Months Ended October 31,
	2020	2019	2020	2019

	(unaudited)
Expected volatility	—%	—%	50% - 54%	43% - 59%
Expected term (in years)	—	—	0.5 - 1.0	0.5 - 1.0
Risk-free interest rate	—%	—%	0.17% - 0.18%	1.95% - 2.05%
Expected dividend yield	—	—	—	—

During the nine months ended October 31, 2020, the Company’s employees purchased 127,734 shares of its Class A common stock under the ESPP. The shares were purchased at a weighted-average purchase price of $100.38 per share, with total proceeds of $12.8 million.

As of October 31, 2020, there was $2.0 million of unrecognized stock-based compensation expense related to the ESPP that is expected to be recognized over an average vesting period of 0.5 years.

Income Taxes	9 Months Ended
Income Taxes	Oct. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three and nine months ended October 31, 2020, the Company recorded a tax provision of $0.2 million and tax benefit of $0.6 million on a pretax loss of $72.6 million and $191.2 million, respectively. The effective tax rate for the three and nine months ended October 31, 2020 was (0.3)% and 0.3%, respectively. The effective tax rate differs from the statutory rate primarily as a result of not recognizing deferred tax assets for U.S. losses due to a full valuation allowance against U.S. deferred tax assets and excess tax benefits from stock-based compensation in the United Kingdom. The tax benefit recognized for the nine months ended October 31, 2020 was partially offset by income tax expense in profitable foreign jurisdictions and U.S. state taxes. For the three and nine months ended October 31, 2019, the Company recorded a tax provision of $0.3 million and tax benefit of $2.3 million on pretax losses of $63.1 million and $160.7 million, respectively. The effective tax rate for the three and nine months ended October 31, 2019 was (0.6)% and 1.4%, respectively. The effective tax rate differs from the statutory rate primarily as a result of not recognizing deferred tax assets for U.S. losses due to a full valuation allowance against U.S. deferred tax assets, release of the valuation allowance in the United States in connection with the Azuqua acquisition and excess tax benefits from stock-based compensation in the United Kingdom. The tax benefit recognized for the nine months ended October 31, 2019 was partially offset by income tax expense in profitable foreign jurisdictions and U.S. state taxes. On March 27, 2020, the President signed into law the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act). The CARES Act provides numerous tax provisions and other stimulus measures, including temporary changes regarding the prior and future use of net operating losses, temporary changes to the prior and future limitations on interest deductions, temporary suspension of certain payment requirements for the employer portion of Social Security taxes, technical corrections from prior tax legislation for tax depreciation of certain qualified improvement property, and the creation of certain refundable employee retention credits. The Company does not expect there to be a material tax impact on its condensed consolidated financial statements at this time, and will continue to assess the implications of the CARES Act and its continuing developments and interpretations.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

Net Loss Per Share

9 Months Ended

Oct. 31, 2020

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 October 31,								Nine Months Ended October 31,
	2020				2019				2020				2019
	Class A		Class B		Class A		Class B		Class A		Class B		Class A		Class B
	(unaudited)
Numerator:
Net loss	$	(68,146)	$	(4,618)	$	(58,761)	$	(4,734)	$	(177,887)	$	(12,639)	$	(145,139)	$	(13,302)
Denominator:
Weighted-average shares outstanding, basic and diluted	120,637		8,176		110,105		8,871		117,849		8,373		105,893		9,705
Net loss per share, basic and diluted	$	(0.56)	$	(0.56)	$	(0.53)	$	(0.53)	$	(1.51)	$	(1.51)	$	(1.37)	$	(1.37)

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 October 31,
	2020	2019
	(unaudited)




Issued and outstanding stock options	9,242	13,426
Unvested RSUs issued and outstanding	4,827	5,101
Unvested restricted stock awards issued and outstanding	—	177
Unvested shares subject to repurchase	1	7

Shares committed under the ESPP	137	209
Shares related to the 2023 Notes	832	2,494
Shares subject to warrants related to the issuance of the 2023 Notes	1,048	2,494
Shares related to the 2025 Notes	5,617	5,617
Shares related to the 2026 Notes	4,820	—
	26,524	29,525

The Company uses the if-converted method for calculating any potential dilutive effect of the conversion options embedded in the Notes on diluted net income per share, if applicable. The conversion options of the 2023, 2025 and 2026 Notes are dilutive in periods of net income on a weighted average basis using an assumed conversion date equal to the later of the beginning of the reporting period and the date of issuance of the respective Notes. The exercise rights of the Warrants will have a dilutive impact on net income per share of common stock under the treasury-stock method when the average market price per share of the Company’s Class A common stock for a given period exceeds the conversion price of $68.06 per share. During the three and nine months ended October 31, 2020, the average price per share of the Company’s Class A common stock exceeded the exercise price of the Warrants; however, since the Company is in a net loss position, there was no dilutive effect during any period presented.

Accounting Standards and Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 31, 2020
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 accounting principles generally accepted in the United States of America (GAAP).
Principles of Consolidation	All intercompany balances and transactions have been eliminated in consolidation. The condensed consolidated balance sheet as of January 31, 2020, 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 results of operations for the interim periods presented, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2021 or any future period.
Fiscal Period	The Company’s fiscal year ends on January 31. References to fiscal 2021, for example, refer to the fiscal year ending January 31, 2021.
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 its convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation of deferred income tax assets, and the valuation of acquired intangible assets. In March 2020, the World Health Organization (WHO) declared the outbreak of the novel coronavirus (COVID-19) a pandemic, which continues to spread across the globe. The Company considered the impact of COVID-19 on the assumptions and estimates used and determined that there were no material adverse impacts on the condensed consolidated financial statements for the three and nine months ended October 31, 2020. As events continue to evolve and additional information becomes available, our assumptions and estimates may change materially in future periods.
Short-Term Investments	The Company’s short-term investments comprise U.S. treasury securities and corporate debt securities. The Company determines the appropriate classification of its short-term investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its short-term investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, short-term investments, including securities with stated maturities beyond twelve months, are classified within current assets in the consolidated balance sheets. Available-for-sale securities are recorded at fair value each reporting period and are periodically evaluated for unrealized losses. For unrealized losses in securities that the Company intends to hold and will not more likely than not be required to sell before recovery, the Company further evaluates whether declines in fair value below amortized cost are due to credit or non-credit related factors. The Company considers credit related impairments to be changes in value that are driven by a change in the creditor’s ability to meet its payment obligations, and records an allowance and recognizes a corresponding loss in interest income and other, net when the impairment is incurred. Unrealized non-credit related losses and unrealized gains are reported as a separate component of accumulated other comprehensive loss in the condensed consolidated balance sheets until realized. Realized gains and losses are determined based on the specific identification method and are reported in interest income and other, net in the condensed consolidated statements of operations.
Accounts Receivable and Allowances	Accounts receivable are recorded at the invoiced amount, net of allowances. These allowances are based on the Company’s assessment of the collectibility of accounts by considering the age of each outstanding invoice, the collection history of each customer, and an evaluation of current expected risk of credit loss based on current conditions and reasonable and supportable forecasts of future economic conditions over the life of the receivable. We assess collectibility by reviewing accounts receivable on an aggregated basis where similar characteristics exist and on an individual basis when we identify specific customers with known disputes or collectibility issues. Amounts deemed uncollectible are recorded as an allowance in the condensed consolidated balance sheets with an offsetting decrease in deferred revenue or a charge to general and administrative expense in the condensed consolidated statements of operations.As of October 31, 2020, allowances reflect collectibility and concession concerns stemming from business and market disruption caused by COVID-19 and may fluctuate materially in future periods as the duration and severity of the impact of the COVID-19 pandemic remains uncertain.
Recently Adopted Accounting Pronouncements and Recent Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, which changes the existing incurred loss impairment model for financial assets held at amortized cost. The new model uses a forward-looking expected loss method to calculate credit loss estimates. ASU 2016-13 also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. The Company adopted the requirements of ASU 2016-13 as of February 1, 2020 on a modified retrospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15), which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. The Company adopted the requirements of ASU 2018-15 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes (ASU 2019-12), as part of its Simplification Initiative to reduce the cost and complexity in accounting for income taxes. ASU 2019-12 removes certain exceptions related to the approach for intraperiod tax allocation and clarifies the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The guidance is effective for interim and annual periods beginning after December 15, 2020, with early adoption permitted. The Company early adopted ASU 2019-12 as of February 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on the Company’s condensed consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted In August 2020, the FASB issued ASU No. 2020-06, Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (ASU 2020-06), which simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. Among other changes, ASU 2020-06 removes from GAAP the liability and equity separation model for convertible instruments with a cash conversion feature, and as a result, after adoption, entities will no longer separately present in equity an embedded conversion feature for such debt. Similarly, the embedded conversion feature will no longer be amortized into income as interest expense over the life of the instrument. Instead, entities will account for a convertible debt instrument wholly as debt unless (1) a convertible instrument contains features that require bifurcation as a derivative under ASC Topic 815, Derivatives and Hedging, or (2) a convertible debt instrument was issued at a substantial premium. Among other potential impacts, this change is expected to reduce reported interest expense, increase reported net income, and result in a reclassification of certain conversion feature balance sheet amounts from stockholders’ equity to liabilities as it relates to the Company’s convertible senior notes. Additionally, ASU 2020-06 requires the application of the if-converted method to calculate the impact of convertible instruments on diluted earnings per share (EPS), which is consistent with the Company’s accounting treatment under the current standard. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, with early adoption permitted for fiscal years beginning after December 15, 2020, and can be adopted on either a fully retrospective or modified retrospective basis. The Company is currently evaluating the timing, method of adoption and overall impact of this standard on its consolidated financial statements.

Cash Equivalents and Short-term Investments (Tables)

9 Months Ended

Oct. 31, 2020

Investments, Debt and Equity Securities [Abstract]

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


	As of October 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
	(unaudited)
Cash equivalents:
Money market funds	$	335,592	$	—	$	—	$	335,592



Total cash equivalents	335,592		—		—		335,592
Short-term investments:


U.S. treasury securities	1,795,309		1,978		(130)		1,797,157
Corporate debt securities	287,523		722		(29)		288,216
Total short-term investments	2,082,832		2,700		(159)		2,085,373
Total	$	2,418,424	$	2,700	$	(159)	$	2,420,965


	As of January 31, 2020
	Amortized Cost		Unrealized Gain		Unrealized Loss		Estimated Fair Value
Cash equivalents:
Money market funds	$	416,584	$	—	$	—	$	416,584

U.S. treasury securities	19,996		—		—		19,996

Total cash equivalents	436,580		—		—		436,580
Short-term investments:


U.S. treasury securities	575,920		686		(8)		576,598
Corporate debt securities	305,859		519		—		306,378
Total short-term investments	881,779		1,205		(8)		882,976
Total	$	1,318,359	$	1,205	$	(8)	$	1,319,556

Schedule of Contractual Maturities of Short-term Investments

The following table presents the contractual maturities of the Company’s short-term investments as of October 31, 2020 (in thousands):


	As of October 31, 2020
	Amortized Cost		Estimated Fair Value
	(unaudited)
Due within one year	$	1,285,936	$	1,288,279
Due between one to five years	796,896		797,094
Total	$	2,082,832	$	2,085,373

Fair Value Measurements (Tables)

9 Months Ended

Oct. 31, 2020

Fair Value Disclosures [Abstract]

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

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


	As of October 31, 2020
	Level 1		Level 2		Level 3		Total
	(unaudited)
Assets:
Cash equivalents:
Money market funds	$	335,592	$	—	$	—	$	335,592



Total cash equivalents	335,592		—		—		335,592
Short-term investments:


U.S. treasury securities	—		1,797,157		—		1,797,157
Corporate debt securities	—		288,216		—		288,216
Total short-term investments	—		2,085,373		—		2,085,373
Total cash equivalents and short-term investments	$	335,592	$	2,085,373	$	—	$	2,420,965


	As of January 31, 2020
	Level 1		Level 2		Level 3		Total

Assets:
Cash equivalents:
Money market funds	$	416,584	$	—	$	—	$	416,584

U.S. treasury securities	—		19,996		—		19,996

Total cash equivalents	416,584		19,996		—		436,580
Short-term investments:


U.S. treasury securities	—		576,598		—		576,598
Corporate debt securities	—		306,378		—		306,378
Total short-term investments	—		882,976		—		882,976
Total cash equivalents and short-term investments	$	416,584	$	902,972	$	—	$	1,319,556

Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note


	As of October 31, 2020
	Net Carrying Amount (1)		Estimated Fair Value
	(unaudited)
2023 convertible senior notes	$	35,614	$	182,234
2025 convertible senior notes	$	876,852	$	1,393,052
2026 convertible senior notes	$	856,489	$	1,316,750

(1) Before unamortized debt issuance costs.

Goodwill and Intangible Assets, net (Tables)

9 Months Ended

Oct. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets, net

Intangible assets consisted of the following (in thousands):


	As of October 31, 2020
	Gross		Accumulated Amortization		Write-offs		Net
	(unaudited)
Capitalized internal-use software costs	$	29,435	$	(18,199)	$	—	$	11,236
Purchased developed technology	28,800		(11,101)		—		17,699
Software licenses	1,112		(1,094)		—		18
	$	59,347	$	(30,394)	$	—	$	28,953


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

Convertible Senior Notes, Net (Tables)

9 Months Ended

Oct. 31, 2020

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 October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Contractual interest expense	$	27	$	99	$	154	$	530
Amortization of debt issuance costs	49		214		266		862
Amortization of debt discount	511		2,403		2,839		9,868
Total	$	587	$	2,716	$	3,259	$	11,260

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


	Three Months Ended October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Contractual interest expense	$	332	$	188	$	994	$	188
Amortization of debt issuance costs	530		275		1,554		275
Amortization of debt discount	8,526		4,649		25,320		4,649
Total	$	9,388	$	5,112	$	27,868	$	5,112

The following table sets forth total interest expense recognized related to the 2026 Notes (in thousands):


	Three Months Ended	Nine Months Ended
		October 31, 2020
		(unaudited)
Contractual interest expense		$	1,078	$	1,653
Amortization of debt issuance costs		318		483
Amortization of debt discount		10,997		16,799
Total		$	12,393	$	18,935

Schedule of Liability and Equity Component of 2023. 2025 and 2026 Notes

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


	As of October 31, 2020
	(unaudited)
Liability component:
Principal	$	40,246
Less: unamortized debt issuance costs and debt discount	(5,115)
Net carrying amount	$	35,131

	As of October 31, 2020
	(unaudited)
Equity component:
2023 Notes	$	9,328
Less: issuance costs	(271)
Carrying amount of the equity component(1)	$	9,057

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

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


	As of October 31, 2020
	(unaudited)
Liability component:
Principal	$	1,060,000
Less: unamortized debt issuance costs and debt discount	(196,126)
Net carrying amount	$	863,874

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

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

The 2026 Notes, net consisted of the following (in thousands):


	As of October 31, 2020
	(unaudited)
Liability component:
Principal	$	1,150,000
Less: unamortized debt issuance costs and debt discount	(304,097)
Net carrying amount	$	845,903

	At Issuance
	(unaudited)
Equity component:
2026 Notes	$	310,311
Less: issuance costs	(4,090)
Carrying amount of the equity component(1)	$	306,221

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

Leases (Tables)

9 Months Ended

Oct. 31, 2020

Leases [Abstract]

Schedule of Operating Lease Costs

Operating lease costs were as follows (in thousands):


	Three Months Ended October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Operating lease cost(1)	$	8,554	$	5,882	$	24,258	$	16,965

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

Schedule of Maturities of Operating Leases

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


	Operating Leases
	(unaudited)
2021	$	5,475
2022	37,094
2023	37,758
2024	38,655
2025	36,111
Thereafter	99,860
Total lease payments	254,953
Less imputed interest	(47,078)

Total operating lease liabilities	$	207,875

Employee Incentive Plans (Tables)

9 Months Ended

Oct. 31, 2020

Share-based Payment Arrangement [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 October 31,				Nine Months Ended October 31,
	2020		2019		2020		2019
	(unaudited)
Cost of revenue
Subscription	$	6,090	$	3,604	$	15,229	$	9,137
Professional services and other	2,113		1,900		5,924		5,292
Research and development	17,546		10,894		44,434		26,322
Sales and marketing	14,368		10,937		38,693		26,959
General and administrative	13,535		8,400		35,494		21,984
Total	$	53,652	$	35,735	$	139,774	$	89,694

Schedule of Shares of Common Stock Reserved for Future Issuance

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


			As of
			October 31, 2020
			(unaudited)
Stock options and unvested RSUs outstanding			14,069,326
Available for future stock option and RSU grants			20,720,051
Available for ESPP			4,752,501
			39,541,878

Schedule of Stock Option Activity

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


	Number of Options	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 2020	12,359,302	$	11.82	6.2	$	1,436,487
Granted	402,891	145.08
Exercised	(3,383,144)	9.92
Canceled	(136,841)	19.62
Outstanding as of October 31, 2020 (unaudited)	9,242,208	$	18.21	5.8	$	1,770,981
As of October 31, 2020

Vested and exercisable (unaudited)	7,429,026	$	9.87	5.4	$	1,485,523

Schedule of Nonvested Restricted Stock Units Activity

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


	Number of RSUs	Weighted- Average Grant Date Fair Value Per Share
Outstanding as of January 31, 2020	4,893,241	$	77.99
Granted	1,960,358	164.64
Vested	(1,667,917)	79.28
Forfeited	(358,564)	84.64
Outstanding as of October 31, 2020 (unaudited)	4,827,118	$	112.24

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

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


	Three Months Ended October 31,		Nine Months Ended October 31,
	2020	2019	2020	2019

	(unaudited)
Expected volatility	—%	—%	50% - 54%	43% - 59%
Expected term (in years)	—	—	0.5 - 1.0	0.5 - 1.0
Risk-free interest rate	—%	—%	0.17% - 0.18%	1.95% - 2.05%
Expected dividend yield	—	—	—	—

Net Loss Per Share (Tables)

9 Months Ended

Oct. 31, 2020

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net Loss Per Share

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


	Three Months Ended October 31,								Nine Months Ended October 31,
	2020				2019				2020				2019
	Class A		Class B		Class A		Class B		Class A		Class B		Class A		Class B
	(unaudited)
Numerator:
Net loss	$	(68,146)	$	(4,618)	$	(58,761)	$	(4,734)	$	(177,887)	$	(12,639)	$	(145,139)	$	(13,302)
Denominator:
Weighted-average shares outstanding, basic and diluted	120,637		8,176		110,105		8,871		117,849		8,373		105,893		9,705
Net loss per share, basic and diluted	$	(0.56)	$	(0.56)	$	(0.53)	$	(0.53)	$	(1.51)	$	(1.51)	$	(1.37)	$	(1.37)

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 October 31,
	2020	2019
	(unaudited)




Issued and outstanding stock options	9,242	13,426
Unvested RSUs issued and outstanding	4,827	5,101
Unvested restricted stock awards issued and outstanding	—	177
Unvested shares subject to repurchase	1	7

Shares committed under the ESPP	137	209
Shares related to the 2023 Notes	832	2,494
Shares subject to warrants related to the issuance of the 2023 Notes	1,048	2,494
Shares related to the 2025 Notes	5,617	5,617
Shares related to the 2026 Notes	4,820	—
	26,524	29,525

Accounting Standards and Significant Accounting Policies - Narrative (Details)	9 Months Ended
	Oct. 31, 2020
Customer concentration risk \| Accounts receivable \| One channel partner
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk	13.00%

Business Combinations - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Mar. 18, 2019	Apr. 30, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Business Acquisition [Line Items]
Payments for business acquisition, net of cash acquired			$ 0	$ 44,223
Goodwill			48,023		$ 48,023
Compensation expense			2,600
Azuqua, Inc.
Business Acquisition [Line Items]
Payments for business acquisition, net of cash acquired	$ 44,200
Cash acquired from acquisition	1,100
Goodwill	29,900
Acquisition related costs		$ 3,000
Azuqua, Inc. \| Purchased developed technology
Business Acquisition [Line Items]
Purchased developed technology	$ 15,700
Useful life of acquired intangible assets	5 years
Azuqua and prior acquisitions
Business Acquisition [Line Items]
Deferred compensation liability			10,800
Remaining balance of noncurrent deferred compensation liability			$ 2,200
Period of recognition of deferred compensation			1 year 4 months 24 days

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	Oct. 31, 2020	Jan. 31, 2020
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	$ 2,418,424	$ 1,318,359
Unrealized Gain	2,700	1,205
Unrealized Loss	(159)	(8)
Estimated Fair Value	2,420,965	1,319,556
U.S. treasury securities
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	1,795,309	575,920
Unrealized Gain	1,978	686
Unrealized Loss	(130)	(8)
Estimated Fair Value	1,797,157	576,598
Corporate debt securities
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	287,523	305,859
Unrealized Gain	722	519
Unrealized Loss	(29)	0
Estimated Fair Value	288,216	306,378
Cash Equivalents
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	335,592	436,580
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	335,592	436,580
Cash Equivalents \| Money market funds
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	335,592	416,584
Unrealized Gain	0	0
Unrealized Loss	0	0
Estimated Fair Value	335,592	416,584
Cash Equivalents \| U.S. treasury securities
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost		19,996
Unrealized Gain		0
Unrealized Loss		0
Estimated Fair Value		19,996
Short-term Investments
Cash Equivalents and Short-term Investments [Abstract]
Amortized Cost	2,082,832	881,779
Unrealized Gain	2,700	1,205
Unrealized Loss	(159)	(8)
Estimated Fair Value	$ 2,085,373	$ 882,976

Cash Equivalents and Short-term Investments - Schedule of Contractual Maturities of Short-term Investments (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Amortized Cost
Amortized Cost	$ 2,418,424	$ 1,318,359
Estimated Fair Value
Estimated fair value	2,420,965	1,319,556
Short-term Investments
Amortized Cost
Amortized cost, due within one year	1,285,936
Amortized cost, due between one to five years	796,896
Amortized Cost	2,082,832	881,779
Estimated Fair Value
Estimated fair value, due within one year	1,288,279
Estimated fair value, due between one to five years	797,094
Estimated fair value	$ 2,085,373	$ 882,976

Cash Equivalents and Short-term Investments - Narrative (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2020 USD ($) investment	Oct. 31, 2019 USD ($)	Oct. 31, 2020 USD ($) investment	Oct. 31, 2019 USD ($)	Jan. 31, 2020 USD ($) investment
Investments, Debt and Equity Securities [Abstract]
Short-term Investments	$ 41,000,000.0		$ 41,000,000.0		$ 0
Interest receivable	$ 10,900,000		$ 10,900,000		$ 5,700,000
Number of short-term investments in unrealized loss positions (in investments) \| investment	62		62		7
Gross unrealized gains or losses from available-for-sale securities	$ 0	$ 0	$ 0	$ 0
Realized gains or losses reclassified out of accumulated other comprehensive income	$ 0	$ 0	0	$ 0
Other-than-temporary impairment short term investment			$ 0		$ 0

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Assets:
Cash equivalents, fair value	$ 335,592	$ 436,580
Short term investments, fair value	2,085,373	882,976
Total cash equivalents and short-term investments	2,420,965	1,319,556
U.S. treasury securities
Assets:
Cash equivalents, fair value		19,996
Short term investments, fair value	1,797,157	576,598
Corporate debt securities
Assets:
Short term investments, fair value	288,216	306,378
Money market funds
Assets:
Cash equivalents, fair value	335,592	416,584
Level 1
Assets:
Cash equivalents, fair value	335,592	416,584
Short term investments, fair value	0	0
Total cash equivalents and short-term investments	335,592	416,584
Level 1 \| U.S. treasury securities
Assets:
Cash equivalents, fair value		0
Short term investments, fair value	0	0
Level 1 \| Corporate debt securities
Assets:
Short term investments, fair value	0	0
Level 1 \| Money market funds
Assets:
Cash equivalents, fair value	335,592	416,584
Level 2
Assets:
Cash equivalents, fair value	0	19,996
Short term investments, fair value	2,085,373	882,976
Total cash equivalents and short-term investments	2,085,373	902,972
Level 2 \| U.S. treasury securities
Assets:
Cash equivalents, fair value		19,996
Short term investments, fair value	1,797,157	576,598
Level 2 \| Corporate debt securities
Assets:
Short term investments, fair value	288,216	306,378
Level 2 \| Money market funds
Assets:
Cash equivalents, fair value	0	0
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
Level 3 \| U.S. treasury securities
Assets:
Cash equivalents, fair value		0
Short term investments, fair value	0	0
Level 3 \| Corporate debt securities
Assets:
Short term investments, fair value	0	0
Level 3 \| Money market funds
Assets:
Cash equivalents, fair value	$ 0	$ 0

Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note (Details) - Senior Notes $ in Thousands	Oct. 31, 2020 USD ($)
Net Carrying Amount \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Convertible senior notes	$ 35,614
Net Carrying Amount \| Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Convertible senior notes	876,852
Net Carrying Amount \| Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Convertible senior notes	856,489
Estimated Fair Value \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Convertible senior notes	182,234
Estimated Fair Value \| Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Convertible senior notes	1,393,052
Estimated Fair Value \| Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Convertible senior notes	$ 1,316,750

Fair Value Measurements - Narrative (Details) $ / shares in Units, $ in Thousands	Oct. 31, 2020 USD ($) $ / shares
Debt Instrument [Line Items]
Closing price of common stock (in dollars per share) \| $ / shares	$ 209.83
Convertible Senior Notes Due 2023 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 40,246
Convertible Senior Notes Due 2025 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	1,060,000
Convertible Senior Notes Due 2026 \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,150,000

Deferred Commissions (Details) - USD ($)	3 Months Ended		9 Months Ended
Deferred Commissions (Details) - USD ($)	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenue from Contract with Customer [Abstract]
Sales commissions capitalized as contract costs	$ 21,500,000	$ 15,300,000	$ 51,800,000	$ 36,700,000
Amortization of contract costs	10,300,000	7,300,000	28,400,000	20,500,000
Impairment loss related to costs capitalized	$ 0	$ 0	$ 0	$ 0

Goodwill and Intangible Assets, net - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 48,023,000		$ 48,023,000		$ 48,023,000
Goodwill impairments	0	$ 0	0	$ 0
Capitalized internal-use software	1,600,000	1,800,000	4,700,000	3,500,000
Intangible amortization expense	$ 2,700,000	$ 2,600,000	$ 8,200,000	$ 7,700,000
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Useful life of purchased developed technology			3 years 3 months 18 days

Goodwill and Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2020	Jan. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross	$ 59,347	$ 54,802
Accumulated Amortization	(30,394)	(22,154)
Write-offs	0	(119)
Net	28,953	32,529
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Gross	29,435	24,890
Accumulated Amortization	(18,199)	(14,828)
Write-offs	0	(119)
Net	11,236	9,943
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	28,800	28,800
Accumulated Amortization	(11,101)	(6,321)
Write-offs	0	0
Net	17,699	22,479
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross	1,112	1,112
Accumulated Amortization	(1,094)	(1,005)
Write-offs	0	0
Net	$ 18	$ 107

Deferred Revenue and Performance Obligations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue recognized that was included in the contract liability balance	$ 174.0	$ 123.5	$ 334.2	$ 224.0

Deferred Revenue and Performance Obligations - Performance Obligations (Details) $ in Millions	Oct. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue from remaining performance obligations	$ 1,581.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-11-01
Revenue from Contract with Customer [Abstract]
Revenue from remaining performance obligations	$ 753.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	48.00%
Performance obligations expected to be satisfied, expected timing	12 months

Convertible Senior Notes, Net - Convertible Senior Notes (Details) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) shares	Oct. 31, 2020 USD ($) $ / shares shares	Oct. 31, 2019 USD ($)	Oct. 31, 2020 USD ($) day $ / shares shares	Oct. 31, 2019 USD ($)
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 89,000	$ 14,572,000	$ 2,263,000	$ 14,572,000
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Limitation on sale of common stock due to sale price threshold (in days) \| day					80
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Redemption price percentage					130.00%
Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Redemption price percentage					130.00%
Senior Notes \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Fixed interest rate			0.25%		0.25%
Net proceeds from notes					$ 335,000,000.0
Debt repurchased, total consideration		$ 224,400,000
Debt repurchase, total consideration	$ 260,500,000	604,800,000
Consideration allocated to debt component	61,800,000	197,700,000
Consideration allocated to equity component	$ 198,700,000	$ 407,100,000
Effective interest rate	4.90%	4.00%	5.68%		5.68%
Face amount of debt instrument	$ 59,600,000	$ 183,100,000
Loss on early extinguishment of debt				14,600,000	$ 2,200,000	14,600,000
Issuance costs			$ 10,000,000.0	$ 3,800,000	10,000,000.0	$ 3,800,000
Senior notes	69,900,000
Debt repurchase, cash portion	$ 200,000
Write off of deferred debt issuance cost					1,000,000.0
Aggregate principal amount			$ 40,246,000		$ 40,246,000
Conversion price (in dollars per share) \| $ / shares			$ 48.36		$ 48.36
Limitation on sale of common stock (in days) \| day					20
Limitation on sale of common stock due to sale price threshold (in days) \| day					30
Threshold percentage of stock price trigger					130.00%
Limit within threshold of consecutive trading days \| day					20
Percentage of closing sale price in excess of convertible notes					98.00%
Repayments of debt			$ 300,000		$ 300,000
Original debt amount			10,400,000		$ 10,400,000
Redemption price percentage					100.00%
Issuance costs attributable to liability component			$ 7,700,000		$ 7,700,000
Initial conversion rate of common stock					0.0206795
Period after consecutive trading days \| day					5
Senior Notes \| Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Fixed interest rate			0.125%		0.125%
Effective interest rate			4.10%		4.10%
Issuance costs			$ 19,300,000		$ 19,300,000
Aggregate principal amount			$ 1,060,000,000		$ 1,060,000,000
Conversion price (in dollars per share) \| $ / shares			$ 188.71		$ 188.71
Limitation on sale of common stock due to sale price threshold (in days) \| day					30
Limit within threshold of consecutive trading days \| day					20
Percentage of closing sale price in excess of convertible notes					98.00%
Redemption price percentage					100.00%
Redemption face amount			$ 0		$ 0
Issuance costs attributable to liability component			$ 15,300,000		$ 15,300,000
Initial conversion rate of common stock					0.0052991
Period after consecutive trading days \| day					5
Sales price as a percentage of conversion price					130.00%
Proceeds from issuance of debt					$ 1,040,700,000
Senior Notes \| Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Fixed interest rate			0.375%		0.375%
Effective interest rate			5.75%		5.75%
Issuance costs			$ 15,200,000		$ 15,200,000
Aggregate principal amount			$ 1,150,000,000		$ 1,150,000,000
Conversion price (in dollars per share) \| $ / shares			$ 238.60		$ 238.60
Limitation on sale of common stock due to sale price threshold (in days) \| day					30
Limit within threshold of consecutive trading days \| day					20
Percentage of closing sale price in excess of convertible notes					98.00%
Redemption price percentage					100.00%
Redemption face amount			$ 0		$ 0
Issuance costs attributable to liability component			11,000,000.0		$ 11,000,000.0
Initial conversion rate of common stock					0.0041912
Period after consecutive trading days \| day					5
Sales price as a percentage of conversion price					130.00%
Proceeds from issuance of debt					$ 1,134,800,000
Additional Paid-in Capital \| Senior Notes \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Issuance costs attributable to equity component			$ 2,300,000		$ 2,300,000
Class A Common Stock \| Senior Notes \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Shares of class a common stock transferred (in shares) \| shares	1.4	3.0
Shares issued during the period \| shares			0.2		0.2

Convertible Senior Notes, Net - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Contractual interest expense	$ 27	$ 99	$ 154	$ 530
Amortization of debt issuance costs	49	214	266	862
Amortization of debt discount	511	2,403	2,839	9,868
Total	587	2,716	3,259	11,260
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Contractual interest expense	332	188	994	188
Amortization of debt issuance costs	530	275	1,554	275
Amortization of debt discount	8,526	4,649	25,320	4,649
Total	9,388	$ 5,112	27,868	$ 5,112
Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Contractual interest expense	1,078		1,653
Amortization of debt issuance costs	318		483
Amortization of debt discount	10,997		16,799
Total	$ 12,393		$ 18,935

Convertible Senior Notes, Net - Schedule of Liability and Equity Component of Notes (Details) - Senior Notes $ in Thousands	Oct. 31, 2020 USD ($)
Convertible Senior Notes Due 2023
Liability component:
Principal	$ 40,246
Less: unamortized debt issuance costs and debt discount	(5,115)
Net carrying amount	35,131
Convertible Senior Notes Due 2025
Liability component:
Principal	1,060,000
Less: unamortized debt issuance costs and debt discount	(196,126)
Net carrying amount	863,874
Convertible Senior Notes Due 2026
Liability component:
Principal	1,150,000
Less: unamortized debt issuance costs and debt discount	(304,097)
Net carrying amount	845,903
Additional Paid-in Capital \| Convertible Senior Notes Due 2023
Equity component:
Equity component	9,328
Less: issuance costs	(271)
Carrying amount of the equity component	9,057
Additional Paid-in Capital \| Convertible Senior Notes Due 2025
Equity component:
Equity component	221,387
Less: issuance costs	(4,040)
Carrying amount of the equity component	217,347
Additional Paid-in Capital \| Convertible Senior Notes Due 2026
Equity component:
Equity component	310,311
Less: issuance costs	(4,090)
Carrying amount of the equity component	$ 306,221

Convertible Senior Notes, Net - Note Hedges and Warrants (Details) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) shares	Oct. 31, 2020 USD ($) day $ / shares shares	Oct. 31, 2019 USD ($) shares
Debt Instrument [Line Items]
Payments for repurchase of Warrants \| $			$ 175,399	$ 358,622
Antidilutive securities excluded from computation of earnings per share (in shares) \| shares			26,524	29,525
Purchase of capped call on convertible debt \| $			$ 133,975	$ 74,094
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Shares issuable under warrants granted (in shares) \| shares	1,400	4,600
Number of shares available for purchase (in shares) \| shares			800
Number of warrants issued subject to anti-dilution adjustments (in shares) \| shares			1,000
Limitation on sale of common stock due to sale price threshold (in days) \| day			80
Value of shares issuable under warrants granted (in dollars per share) \| $ / shares			$ 68.06
Proceeds from issuance of warrants related to 2023 convertible senior notes \| $			$ 52,400
Payments for repurchase of Warrants \| $	$ 175,400	$ 358,600
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Initial cap price of capped calls (in dollars per share) \| $ / shares			$ 255.88
Purchase of capped call on convertible debt \| $			$ 74,100
Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Initial cap price of capped calls (in dollars per share) \| $ / shares			$ 360.14
Purchase of capped call on convertible debt \| $			$ 134,000
Senior Notes \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Shares issuable under warrants granted (in shares) \| shares	1,400	4,600	7,100
Conversion price (in dollars per share) \| $ / shares			$ 48.36
Purchases of hedges related to 2023 convertible senior notes \| $			$ 80,000
Proceeds from hedges related to convertible senior notes \| $	$ 195,000	$ 405,900
Debt repurchased, face amount \| $			$ 10,400
Number of warrants issued subject to anti-dilution adjustments (in shares) \| shares			7,100
Limitation on sale of common stock due to sale price threshold (in days) \| day			30
Limit within threshold of consecutive trading days \| day			20
Senior Notes \| Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Conversion price (in dollars per share) \| $ / shares			$ 188.71
Limitation on sale of common stock due to sale price threshold (in days) \| day			30
Limit within threshold of consecutive trading days \| day			20
Senior Notes \| Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Conversion price (in dollars per share) \| $ / shares			$ 238.60
Limitation on sale of common stock due to sale price threshold (in days) \| day			30
Limit within threshold of consecutive trading days \| day			20
Shares related to convertible senior notes \| Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares) \| shares			832	2,494
Shares related to convertible senior notes \| Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares) \| shares			5,617	5,617
Shares related to convertible senior notes \| Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares) \| shares			4,820	0

Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Leases - Narrative (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Leases [Abstract]
Weighted average remaining lease term	7 years 1 month 6 days		7 years 1 month 6 days		7 years 10 months 24 days
Weighted average discount rate	5.60%		5.60%		5.70%
Cash payments included in the measurement of operating lease liabilities	$ 7.7	$ 6.1	$ 22.7	$ 10.9

Leases - Schedule of Operating Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Lease cost:
Operating lease cost	$ 8,554	$ 5,882	$ 24,258	$ 16,965

Leases - Schedule of Maturities of Operating Leases (Details) $ in Thousands	Oct. 31, 2020 USD ($)
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2021	$ 5,475
2022	37,094
2023	37,758
2024	38,655
2025	36,111
Thereafter	99,860
Total lease payments	254,953
Less imputed interest	(47,078)
Total operating lease liabilities	$ 207,875

Commitments and Contingencies - Narrative (Details) - USD ($)	Oct. 31, 2020	Jan. 31, 2020
Other Commitments [Line Items]
Draws on line of credit	$ 0	$ 0
Letter of Credit
Other Commitments [Line Items]
Letters of credit issued and outstanding	$ 11,200,000	$ 11,900,000

- 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		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 53,652	$ 35,735	$ 139,774	$ 89,694
Subscription
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	6,090	3,604	15,229	9,137
Professional services and other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,113	1,900	5,924	5,292
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	17,546	10,894	44,434	26,322
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	14,368	10,937	38,693	26,959
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 13,535	$ 8,400	$ 35,494	$ 21,984

Employee Incentive Plans - Narrative (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Oct. 31, 2020 USD ($) incentive_plan purchase_period $ / shares shares	Jan. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity incentive plans (in incentive plans) \| incentive_plan	2
Options to purchase common stock outstanding (in shares) \| shares	9,242,208	12,359,302
Unrecognized stock-based compensation expense related to stock options \| $	$ 36.2
Unrecognized stock-based compensation expenses related to unvested RSUs \| $	$ 501.8
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period	1 year 6 months
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period	2 years 7 months 6 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average stock-based compensation recognition period	6 months
Offering period	12 months
Number of stock plan purchase periods \| purchase_period	2
Stock plan purchase period	6 months
Shares of employee purchased Class A common stock (in shares) \| shares	127,734
Weighted-average purchase price of employee purchased Class A common stock (in dollars per share) \| $ / shares	$ 100.38
Total proceeds from employee purchase of Class A common stock \| $	$ 12.8
Unrecognized compensation costs related to unvested restricted stock units \| $	$ 2.0
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	1,176,642
2017 Equity Incentive Plan \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options to purchase common stock outstanding (in shares) \| shares	8,065,566

Employee Incentive Plans - Schedule of Common Stock Reserved for Future Issuance (Details)	Oct. 31, 2020 shares
Class of Stock [Line Items]
Common stock reserved for future issuance and options and unvested RSUs outstanding (in shares)	39,541,878
Stock Options and Restricted Stock Units
Class of Stock [Line Items]
Stock options and unvested RSUs outstanding (in shares)	14,069,326
Common stock, reserved for future issuance (in shares)	20,720,051
ESPP
Class of Stock [Line Items]
Common stock, reserved for future issuance (in shares)	4,752,501

Employee Incentive Plans - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2020	Jan. 31, 2020
Number of Options
Number of options, outstanding beginning of period (in shares)	12,359,302
Number of options, granted (in shares)	402,891
Number of options, exercised (in shares)	(3,383,144)
Number of options, canceled (in shares)	(136,841)
Number of options, outstanding end of period (in shares)	9,242,208	12,359,302
Vested and exercisable, number of options (in shares)	7,429,026
Weighted- Average Exercise Price
Options outstanding, weighted average exercise price beginning of period (in dollars per share)	$ 11.82
Options granted, weighted average exercise price (in dollars per share)	145.08
Options exercised, weighted average exercise price (in dollars per share)	9.92
Options canceled, weighted average exercise price (in dollars per share)	19.62
Options outstanding, weighted average exercise price end of period (in dollars per share)	18.21	$ 11.82
Vested and exercisable, weighted average exercise price (in dollars per share)	$ 9.87
Additional Disclosures
Options outstanding, weighted average remaining contractual term	5 years 9 months 18 days	6 years 2 months 12 days
Options outstanding, aggregate intrinsic value	$ 1,770,981	$ 1,436,487
Vested and exercisable, weighted average remaining contractual term	5 years 4 months 24 days
Vested and exercisable, aggregate intrinsic value	$ 1,485,523

Employee Incentive Plans - Schedule of Restricted Stock Unit Activity (Details) - Restricted stock units	9 Months Ended
	Oct. 31, 2020 $ / 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	4,893,241
Granted (in shares) \| shares	1,960,358
Vested (in shares) \| shares	(1,667,917)
Forfeited (in shares) \| shares	(358,564)
Ending balance (in shares) \| shares	4,827,118
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	$ 77.99
Granted (in dollars per share) \| $ / shares	164.64
Vested (in dollars per share) \| $ / shares	79.28
Forfeited (in dollars per share) \| $ / shares	84.64
Ending balance (in dollars per share) \| $ / shares	$ 112.24

Employee Incentive Plans - Schedule of Black-Scholes Option Pricing Model Estimated Fair Value Assumptions (Details)	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	0.00%	0.00%	50.00%	43.00%
Expected volatility			54.00%	59.00%
Expected term (in years)	0 years	0 years
Risk-free interest rate	0.00%	0.00%	0.17%	1.95%
Risk-free interest rate			0.18%	2.05%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)			6 months	6 months
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)			1 year	1 year

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Income Tax Disclosure [Abstract]
Tax expense (benefit)	$ 209	$ 349	$ (626)	$ (2,285)
Pretax losses	$ (72,555)	$ (63,146)	$ (191,152)	$ (160,726)
Effective income tax rate	(0.30%)	(0.60%)	0.30%	1.40%

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(10))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(8))
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-05(b)(2))
-URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

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		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Numerator:
Net loss	$ (72,764)	$ (63,495)	$ (190,526)	$ (158,441)
Denominator:
Weighted-average shares outstanding , basic and diluted (in shares)	128,813	118,976	126,222	115,598
Net loss per share, basic and diluted (in dollars per share)	$ (0.56)	$ (0.53)	$ (1.51)	$ (1.37)
Class A Common Stock
Numerator:
Net loss	$ (68,146)	$ (58,761)	$ (177,887)	$ (145,139)
Denominator:
Weighted-average shares outstanding , basic and diluted (in shares)	120,637	110,105	117,849	105,893
Net loss per share, basic and diluted (in dollars per share)	$ (0.56)	$ (0.53)	$ (1.51)	$ (1.37)
Class B Common Stock
Numerator:
Net loss	$ (4,618)	$ (4,734)	$ (12,639)	$ (13,302)
Denominator:
Weighted-average shares outstanding , basic and diluted (in shares)	8,176	8,871	8,373	9,705
Net loss per share, basic and diluted (in dollars per share)	$ (0.56)	$ (0.53)	$ (1.51)	$ (1.37)

- Definition

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

+ References

+ Details

Net Loss Per Share - Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Per Share (Details) - shares shares in Thousands	9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	26,524	29,525
Issued and outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	9,242	13,426
Unvested RSUs issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	4,827	5,101
Unvested restricted stock awards issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	177
Unvested shares subject to repurchase
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1	7
Shares committed under the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	137	209
Shares related to convertible senior notes \| Convertible Senior Notes Due 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	832	2,494
Shares related to convertible senior notes \| Convertible Senior Notes Due 2025
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	5,617	5,617
Shares related to convertible senior notes \| Convertible Senior Notes Due 2026
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	4,820	0
Shares subject to warrants related to the issuance of the 2023 Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,048	2,494

Net Loss Per Share - Narrative (Details)	9 Months Ended
Net Loss Per Share - Narrative (Details)	Oct. 31, 2020 USD ($) $ / shares
Debt Instrument [Line Items]
Dilutive effect on securities \| $	$ 0
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Value of shares issuable under warrants granted (in dollars per share) \| $ / shares	$ 68.06

Label	Element	Value
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	$ 2,413,000
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	307,000
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	11,520,000
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	$ 11,438,000