Okta (OKTA) 10-K 6 Mar 20 2020 FY Annual report Financial data

Cover

Cover - USD ($) $ in Billions	12 Months Ended
	Jan. 31, 2020	Feb. 29, 2020	Jul. 31, 2019
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 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 Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Smaller Reporting Company	false
Emerging Growth Company	false
Shell Company	false
Entity Public Float			$ 13.7
Amendment Flag	false
Entity Central Index Key	0001660134
Current Fiscal Year End Date	--01-31
Document Fiscal Year Focus	2020
Document Period Focus	FY
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		114,216,093
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		8,558,279

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019	[1]
Current assets:
Cash and cash equivalents	$ 520,048	$ 298,394	[2]
Short-term investments	882,976	265,374
Accounts receivable, net of allowances of $1,166 and $2,098	130,115	91,926
Deferred commissions	33,636	24,185
Prepaid expenses and other current assets	32,950	28,237
Total current assets	1,599,725	708,116
Property and equipment, net	53,535	52,921
Operating lease right-of-use assets	125,204	121,389
Deferred commissions, noncurrent	77,874	54,812
Intangible assets, net	32,529	13,897
Goodwill	48,023	18,089
Other assets	18,505	15,089
Total assets	1,955,395	984,313
Current liabilities:
Accounts payable	3,837	2,431
Accrued expenses and other current liabilities	36,887	33,653
Accrued compensation	40,300	19,770
2023 convertible senior notes, net	100,703	271,628
Deferred revenue	365,236	245,622
Total current liabilities	546,963	573,104
2025 convertible senior notes, net	837,002	0
Operating lease liabilities, noncurrent	154,511	147,046
Deferred revenue, noncurrent	6,214	8,768
Other liabilities, noncurrent	5,361	3,018
Total liabilities	1,550,051	731,936
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 January 31, 2020 and 2019	0	0
Additional paid-in capital	1,105,564	744,896
Accumulated other comprehensive income (loss)	892	(319)
Accumulated deficit	(701,124)	(492,211)
Total stockholders’ equity	405,344	252,377
Total liabilities and stockholders’ equity	1,955,395	984,313
Class A Common Stock
Stockholders’ equity:
Common stock	11	10
Class B Common Stock
Stockholders’ equity:
Common stock	$ 1	$ 1
[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

CONSOLIDATED BALANCE SHEETS (Pa

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

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Revenue
Total revenue	$ 586,067	$ 399,254		$ 256,547
Cost of revenue
Total cost of revenue	159,382	113,421		80,755
Gross profit	426,685	285,833		175,792
Operating expenses
Research and development	159,269	102,385		70,821
Sales and marketing	340,356	227,960		165,020
General and administrative	112,892	75,110		51,803
Total operating expenses	612,517	405,455		287,644
Operating loss	(185,832)	(119,622)		(111,852)
Interest expense	(27,017)	(15,072)		0
Interest income and other, net	17,089	9,180		1,682
Loss on early extinguishment of debt	(14,572)	0	[1]	0	[1]
Interest expense and other, net	(24,500)	(5,892)		1,682
Loss before benefit from income taxes	(210,332)	(125,514)		(110,170)
Benefit from income taxes	(1,419)	(17)		(321)
Net loss	$ (208,913)	$ (125,497)	[1]	$ (109,849)	[1]
Net loss per share, basic and diluted (in dollars per share)	$ (1.78)	$ (1.17)		$ (1.32)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	117,221	107,504		83,004
Subscription
Revenue
Total revenue	$ 552,688	$ 370,855		$ 236,422
Cost of revenue
Total cost of revenue	116,445	77,354		52,481
Professional services and other
Revenue
Total revenue	33,379	28,399		20,125
Cost of revenue
Total cost of revenue	$ 42,937	$ 36,067		$ 28,274
[1]	Adjusted for adoption of ASC 842. See Note 2.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (208,913)	$ (125,497)	[1]	$ (109,849)	[1]
Net change in unrealized gains or losses on available-for-sale securities	1,220	179		(202)
Foreign currency translation adjustments	(9)	(889)		760
Other comprehensive income (loss)	1,211	(710)		558
Comprehensive loss	$ (207,702)	$ (126,207)		$ (109,291)
[1]	Adjusted for adoption of ASC 842. See Note 2.

CONSOLIDATED STATEMENTS OF REDE

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)	Total		Series B Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred Stock	Common StockClass A Common Stock	Common StockClass B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2017	59,465,439
Beginning balance at Jan. 31, 2017	$ 227,954,000
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Series B redeemable convertible preferred stock upon net exercise of warrants (in shares)			26,201
Issuance of Series B redeemable convertible preferred stock upon net exercise of warrants			$ 408,000
Conversion of convertible preferred stock to common stock in connection with initial public offering (in shares)				(59,491,640)		59,491,640
Conversion of convertible preferred stock to common stock in connection with initial public offering	$ 228,362,000			$ (228,362,000)		$ 6,000	$ 228,356,000
Ending balance (in shares) at Jan. 31, 2018	0
Ending balance at Jan. 31, 2018	$ 0
Beginning balance (in shares) at Jan. 31, 2017					0	20,293,338
Beginning balance at Jan. 31, 2017	(212,361,000)				$ 0	$ 2,000	44,469,000	$ (167,000)	$ (256,665,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net (in shares)					8,274,599	900,517
Issuance of common stock upon exercise of stock options and other activity, net	34,698,000				$ 1,000		34,697,000
Issuance of common stock upon net exercise of warrant (in shares)						168,750
Issuance of common stock in connection with initial public offering, net of underwriting discounts and issuance costs (in shares)					12,650,000
Issuance of common stock in connection with initial public offering, net of underwriting discounts and issuance costs	194,345,000				$ 1,000		194,344,000
Conversion of convertible preferred stock to common stock in connection with initial public offering (in shares)				(59,491,640)		59,491,640
Conversion of convertible preferred stock to common stock in connection with initial public offering	228,362,000			$ (228,362,000)		$ 6,000	228,356,000
Issuance of common stock and restricted stock in connection with acquisition (in shares)						1,598,500
Issuance of common stock and restricted stock in connection with acquisition	3,652,000						3,652,000
Issuance of common stock pursuant to charitable donation (in shares)					24,287
Issuance of common stock pursuant to charitable donation	708,000	[1]					708,000
Issuance of common stock under employee stock purchase plan (in shares)					569,373
Issuance of common stock under employee stock purchase plan	8,369,000						8,369,000
Conversion of Class B common stock to Class A common stock (in shares)					49,091,639	(49,091,639)
Conversion of Class B common stock to Class A common stock	0				$ 5,000	$ (5,000)
Stock-based compensation	50,858,000						50,858,000
Other comprehensive income	558,000							558,000
Net loss	(109,849,000)	[1]			$ (31,980,000)	$ (77,869,000)			(109,849,000)
Ending balance (in shares) at Jan. 31, 2018					70,609,898	33,361,106
Ending balance at Jan. 31, 2018	$ 199,340,000				$ 7,000	$ 3,000	565,653,000	391,000	(366,714,000)
Ending balance (in shares) at Jan. 31, 2019	0
Ending balance at Jan. 31, 2019	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net (in shares)					6,465,957	104,084
Issuance of common stock upon exercise of stock options and other activity, net	37,611,000				$ 1,000		37,610,000
Issuance of common stock pursuant to charitable donation (in shares)					20,000
Issuance of common stock pursuant to charitable donation	1,008,000	[1]					1,008,000
Issuance of common stock under employee stock purchase plan (in shares)					615,210
Issuance of common stock under employee stock purchase plan	13,727,000						13,727,000
Issuance of common stock for settlement of RSUs (in shares)					976,248
Conversion of Class B common stock to Class A common stock (in shares)					22,406,009	(22,406,009)
Conversion of Class B common stock to Class A common stock	0				$ 2,000	$ (2,000)
Equity component of convertible senior notes, net of issuance costs	77,631,000						77,631,000
Issuance of warrants related to 2023 convertible senior notes	52,440,000						52,440,000
Purchases of hedges related to 2023 convertible senior notes	(80,040,000)						(80,040,000)
Stock-based compensation	76,867,000						76,867,000
Other comprehensive income	(710,000)							(710,000)
Net loss	(125,497,000)	[1]			$ (107,926,000)	$ (17,571,000)			(125,497,000)
Ending balance (in shares) at Jan. 31, 2019					101,093,322	11,059,181
Ending balance at Jan. 31, 2019	$ 252,377,000	[2]			$ 10,000	$ 1,000	744,896,000	(319,000)	(492,211,000)
Ending balance (in shares) at Jan. 31, 2020	0
Ending balance at Jan. 31, 2020	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net (in shares)	5,422,281				5,323,410	100,007
Issuance of common stock upon exercise of stock options and other activity, net	$ 45,732,000				$ 1,000		45,731,000
Issuance of common stock pursuant to charitable donation (in shares)					15,000
Issuance of common stock pursuant to charitable donation	1,746,000						1,746,000
Issuance of common stock under employee stock purchase plan (in shares)					322,795
Issuance of common stock under employee stock purchase plan	$ 18,767,000						$ 18,767,000
Issuance of common stock for settlement of RSUs (in shares)	0				1,716,222		0
Issuance of common stock for settlement of bonus (in shares)					34,600		2,809,000
Issuance of stock for settlement of bonus	$ 2,809,000
Conversion of Class B common stock to Class A common stock (in shares)					2,511,409	(2,511,409)
Conversion of Class B common stock to Class A common stock	0					$ 0
Equity component of convertible senior notes, net of issuance costs	217,347,000						$ 217,347,000
Equity component of early extinguishment of 2023 convertible senior notes	(26,713,000)				$ 2,973,311		(26,713,000)
Proceeds from hedges related to 2023 convertible senior notes	405,851,000						405,851,000
Payments for warrants related to 2023 convertible senior notes	(358,622,000)						(358,622,000)
Purchases of hedges related to 2023 convertible senior notes	(74,094,000)						(74,094,000)
Stock-based compensation	127,846,000						127,846,000
Other comprehensive income	1,211,000							1,211,000
Net loss	(208,913,000)				$ (192,138,000)	$ (16,775,000)
Ending balance (in shares) at Jan. 31, 2020					113,990,069	8,647,779
Ending balance at Jan. 31, 2020	$ 405,344,000				$ 11,000	$ 1,000	$ 1,105,564,000	$ 892,000	$ (701,124,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of RSUs (in shares)	12,359,302
[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Cash flows from operating activities:
Net loss		$ (208,913)	$ (125,497)	[1]	$ (109,849)	[1]
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation		126,624	76,320	[1]	49,860	[1]
Depreciation, amortization and accretion		17,815	8,001	[1]	7,001	[1]
Amortization of debt discount and issuance costs		25,892	14,279	[1]	0	[1]
Amortization of deferred commissions		28,588	20,852	[1]	15,180	[1]
Deferred income taxes		(2,253)	(765)	[1]	(534)	[1]
Write-off of intangible assets		119	0	[1]	1,114	[1]
Non-cash charitable contributions		1,746	1,008	[1]	708	[1]
Loss on early extinguishment of debt		14,572	0	[1]	0	[1]
Other, net		(130)	640	[1]	719	[1]
Changes in operating assets and liabilities:
Accounts receivable		(37,515)	(39,682)	[1]	(18,321)	[1]
Deferred commissions		(61,224)	(41,342)	[1]	(26,986)	[1]
Prepaid expenses and other assets		(4,080)	(10,334)	[1]	(9,400)	[1]
Operating lease right-of-use assets		12,951	17,239	[1]	7,776	[1]
Accounts payable		1,689	(1,437)	[1]	(2,464)	[1]
Accrued compensation		23,034	7,429	[1]	3,582	[1]
Accrued expenses and other liabilities		9,972	5,800	[1]	5,801	[1]
Operating lease liabilities		(9,716)	(6,642)	[1]	(7,087)	[1]
Deferred revenue		116,432	89,303	[1]	57,660	[1]
Net cash provided by (used in) operating activities		55,603	15,172	[1]	(25,240)	[1]
Cash flows from investing activities:
Capitalization of internal-use software costs		(3,888)	(2,851)	[1]	(5,431)	[1]
Purchases of property and equipment		(15,442)	(19,811)	[1]	(6,550)	[1]
Proceeds from sales of property and equipment		0	740	[1]	0	[1]
Purchases of securities available for sale and other		(999,387)	(631,488)	[1]	(129,086)	[1]
Proceeds from maturities and redemption of securities available for sale		356,277	298,650	[1]	39,825	[1]
Proceeds from sales of securities available for sale and other		27,271	173,072	[1]	1,538	[1]
Purchase of intangible assets		(8,589)	0	[1]	0	[1]
Payments for business acquisition, net of cash acquired		(44,283)	(15,632)	[1]	0	[1]
Net cash used in investing activities		(688,041)	(197,320)	[1]	(99,704)	[1]
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriters' discounts and commissions		0	0	[1]	199,948	[1]
Proceeds from issuance of convertible senior notes, net of issuance costs		1,040,660	334,980	[1]	0	[1]
Payments for repurchases of 2023 convertible senior notes		(224,414)	0	[1]	0	[1]
Purchases of hedges related to 2023 convertible senior notes		0	(80,040)	[1]	0	[1]
Proceeds from hedges related to 2023 convertible senior notes		405,851	0	[1]	0	[1]
Proceeds from issuance of warrants related to 2023 convertible senior notes		0	52,440	[1]	0	[1]
Payments for warrants related to 2023 convertible senior notes		(358,622)	0	[1]	0	[1]
Purchases of capped calls related to 2025 convertible senior notes		(74,094)	0	[1]	0	[1]
Payments of deferred offering costs		0	0	[1]	(4,038)	[1]
Proceeds from stock option exercises, net of repurchases		45,363	36,861	[1]	33,646	[1]
Proceeds from shares issued in connection with employee stock purchase plan		18,767	13,727	[1]	8,369	[1]
Other, net		(126)	(206)	[1]	(517)	[1]
Net cash provided by financing activities		853,385	357,762	[1]	237,408	[1]
Effects of changes in foreign currency exchange rates on cash, cash equivalents and restricted cash		(209)	(632)	[1]	487	[1]
Net increase in cash, cash equivalents and restricted cash		220,738	174,982	[1]	112,951	[1]
Cash, cash equivalents and restricted cash at beginning of year	[1]	311,215	136,233		23,282
Cash, cash equivalents and restricted cash at end of year		531,953	311,215	[1]	136,233	[1]
Cash paid during the period for:
Interest		862	403	[1]	19	[1]
Income taxes		1,123	514	[1]	747	[1]
Non-cash investing and financing activities:
Issuance of common stock for repurchases of 2023 convertible senior notes		380,406	0	[1]	0	[1]
Vesting of early exercised common stock options		370	763	[1]	1,335	[1]
Issuance of common stock in connection with warrant exercises		0	0		272
Common stock issued as charitable contribution		1,746	1,008	[1]	708	[1]
Operating lease right-of-use assets exchanged for lease obligations		16,832	127,575	[1]	44,668	[1]
Property and equipment acquired through tenant improvement allowances		304	22,236	[1]	0	[1]
Property and equipment and other accrued but not yet paid		855	7,225	[1]	111	[1]
Bonus settled through the issuance of common stock		2,809	0	[1]	0	[1]
Issuance of common stock in connection with business combination		0	0	[1]	2,160	[1]
Conversion of redeemable convertible preferred stock to common stock		0	0	[1]	228,362	[1]
Reconciliation of cash, cash equivalents, and restricted cash within the consolidated balance sheets to the amounts shown in the statements of cash flows above:
Total cash, cash equivalents and restricted cash	[1]	$ 311,215	$ 136,233		$ 136,233
[1]	Adjusted for adoption of ASC 842. See Note 2.

Overview and Basis of Presentat

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

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Segment Information The Company operates in a single operating segment. The Company’s chief operating decision maker is its chief executive officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources. Revenue Recognition The Company derives revenue from subscription fees (which include support fees) and professional services fees. The Company sells subscriptions to its platform through arrangements that are generally one to five years in length. The Company’s arrangements are generally noncancelable and nonrefundable. Furthermore, if a customer reduces the contracted usage or service level, the customer has no right of refund. The Company’s subscription arrangements do not provide customers with the right to take possession of the software supporting the platform and, as a result, are accounted for as service arrangements. This revenue recognition policy is consistent for sales generated directly with customers and sales generated indirectly through channel partners. The Company determines revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, the Company satisfies a performance obligation. Subscription Revenue Subscription revenue, which includes support, is recognized on a straight-line basis over the noncancelable contractual term of the arrangement, generally beginning on the date that the Company’s service is made available to the customer. Professional Services Revenue The Company’s professional services principally consist of customer-specific requests for application integrations, user interface enhancements and other customer-specific requests. Revenue for the Company’s professional services is recognized as services are performed in proportion to their pattern of transfer. Contracts with Multiple Performance Obligations Some of the Company’s contracts with customers contain multiple performance obligations. For these contracts, the Company accounts for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative SSP basis. The Company determines SSP based on observable, if available, prices for those related services when sold separately. When such observable prices are not available, the Company determines SSP based on overarching pricing objectives and strategies, taking into consideration market conditions and other factors, including customer size, volume purchased, market and industry conditions, product-specific factors and historical sales of the deliverables. Deferred Revenue Deferred revenue consists primarily of payments received and accounts receivable recorded in advance of revenue recognition under the Company’s subscription and support services and professional services arrangements. The Company primarily invoices its customers for its subscription services arrangements annually in advance. The Company’s payment terms generally provide that customers pay the invoiced portion of the total arrangement fee within 30 days of the invoice date. Amounts anticipated to be recognized within one year of the balance sheet date are recorded as deferred revenue, current; the remaining portion is recorded as deferred revenue, noncurrent in the consolidated balance sheets. Deferred Commissions Sales commissions earned by the Company’s sales force are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions for new revenue contracts, including incremental sales to existing customers, are deferred and then amortized on a straight-line basis over a period of benefit, which the Company has determined to be generally five years. The Company determined the period of benefit by taking into consideration its customer contracts, its technology and other factors. Sales commissions for renewal contracts (which are not considered commensurate with sales commissions for new revenue contracts and incremental sales to existing customers) are deferred and then amortized on a straight-line basis over the related period of benefit, which is generally the related contract renewal term. Amortization expense is included in sales and marketing expenses in the accompanying consolidated statements of operations. Sales commissions capitalized as contract costs totaled $61.3 million and $41.3 million in the years ended January 31, 2020 and 2019 , respectively. Amortization of contract costs was $28.6 million , $20.9 million and $15.2 million for the years ended January 31, 2020 , 2019 and 2018 , respectively. There was no impairment loss in relation to the costs capitalized. Cost of Revenue Costs of revenue primarily consist of costs related to providing the Company’s cloud-based platform to its customers, including third-party hosting fees, amortization of capitalized internal-use software and finite-lived purchased developed technology, customer support, other employee-related expenses for security, technical operations and professional services staff, and allocated overhead costs. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents consist of cash on hand and highly liquid investments with original maturities of three months or less from the date of purchase. Cash equivalents generally consist of investments in money market funds. The fair market value of cash equivalents approximated their carrying value as of January 31, 2020 and 2019 . As of January 31, 2020 and 2019 , the Company's long-term restricted cash balance was $11.4 million related to letters of credit for its facility lease agreements. Long-term restricted cash is included within other assets on the Company's consolidated balance sheet. Short-term Investments The Company’s short-term investments comprise asset-backed securities, U.S. treasury securities and corporate debt securities. The Company determines the appropriate classification of its short-term investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its short-term investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, the Company classifies its short-term investments, including securities with stated maturities beyond twelve months, within current assets in the consolidated balance sheets. Available-for-sale securities are recorded at fair value each reporting period. Unrealized gains and losses on these short-term investments are reported as a separate component of accumulated other comprehensive loss in the consolidated balance sheets until realized. Interest income is reported within interest income and other, net in the consolidated statements of operations. The Company periodically evaluates its short-term investments to assess whether those with unrealized loss positions are other-than-temporarily impaired. The Company considers various factors in determining whether to recognize an impairment charge, including the length of time the investment has been in a loss position, the extent to which the fair value is less than the Company’s cost basis, the investment’s financial condition and near-term prospects of the investee. Realized gains and losses are determined based on the specific identification method and are reported in interest income and other, net in the consolidated statements of operations. If the Company determines that the decline in an investment’s fair value is other-than-temporary, the difference is recognized as an impairment loss in the consolidated statements of operations. Accounts Receivable and Allowances Accounts receivable are recorded at the invoiced amount, net of allowances. These allowances are based on the Company’s assessment of the collectibility of accounts by considering the age of each outstanding invoice, the collection history of each customer and an evaluation of potential risk of loss associated with delinquent accounts. Amounts deemed uncollectible are recorded to these allowances in the consolidated balance sheets with an offsetting decrease in related deferred revenue and a charge to general and administrative expense in the consolidated statement of operations. Property and Equipment Property and equipment, net, is stated at cost less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the respective assets. Repairs and maintenance costs are expensed as incurred. The useful lives of property and equipment are as follows: Useful lives Capitalized internal-use software costs 3 years Computers and equipment 3 years Furniture and fixtures 7 years Leasehold improvements Shorter of estimated useful life or remaining lease term Business Combinations When the Company acquires a business, the purchase price is allocated to the net tangible and identifiable intangible assets acquired. Any residual purchase price is recorded as goodwill. The allocation of the purchase price requires management to make estimates in determining the fair values of assets acquired and liabilities assumed, especially with respect to intangible assets. These estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, the appropriate weighted-average cost of capital and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable. During the measurement period, which may be up to one year from the acquisition date, adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed may be recorded, with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated statements of operations. Goodwill and Other Long-Lived Assets The excess of the purchase price over the estimated fair value of net assets of businesses acquired in a business combination is recognized as goodwill. Goodwill is tested for impairment annually on November 1 st or more frequently if certain indicators are present. Long-lived assets, such as property and equipment and finite-lived intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of any asset may not be recoverable. Recoverability of assets to be held and used is measured by comparing the carrying amount to the estimated undiscounted future cash flows expected to be generated. If the carrying amount exceeds the undiscounted cash flows, the assets are determined to be impaired and an impairment charge is recognized as the amount by which the carrying amount exceeds its fair value. The Company amortizes intangible assets with finite lives on a straight-line basis over their estimated useful lives in cost of revenue in the consolidated statements of operations. Operating Leases and Incremental Borrowing Rate The Company leases office space under operating leases with expiration dates through 2028. The Company determines whether an arrangement constitutes a lease and records lease liabilities and right-of-use assets on its consolidated balance sheets at lease commencement. Lease liabilities are measured based on the present value of the total lease payments not yet paid discounted based on the more readily determinable of either the rate implicit in the lease or the Company’s incremental borrowing rate, which is the estimated rate the Company would be required to pay for a collateralized borrowing equal to the total lease payments over the term of the lease. Lease liabilities due within twelve months are included within accrued expenses and other current liabilities on the Company's consolidated balance sheet. The estimation of the incremental borrowing rate is based on an analysis of publicly traded debt securities of companies with similar credit and financial profiles. Right-of-use assets are measured based on the corresponding lease liability adjusted for (i) payments made to the lessor at or before the commencement date, (ii) initial direct costs incurred and (iii) tenant incentives received, incurred or payable under the lease. Recognition of rent expense begins when the lessor makes the underlying asset available to the Company. The Company does not assume renewals or early terminations of its leases unless it is reasonably certain to exercise these options at commencement and does not allocate consideration between lease and non-lease components. For short-term leases, the Company records rent expense in its condensed consolidated statements of operations on a straight-line basis over the lease term and records variable lease payments as incurred. Convertible Senior Notes In February 2018 , the Company issued $345.0 million aggregate principal amount of 0.25% convertible senior notes due February 15, 2023 in a private offering (2023 Notes). In September 2019 , the Company issued $1,060.0 million aggregate principal amount of 0.125% convertible senior notes due September 1, 2025 (2025 Notes, the 2025 Notes together with the 2023 Notes, the Notes). Concurrent with the issuance of the 2025 Notes, the Company used part of the net proceeds to repurchase a portion of the 2023 Notes (2023 Notes Partial Repurchase). See Note 9 for additional details. The Notes are accounted for in accordance with FASB ASC Subtopic 470-20, Debt with Conversion and Other Options. Pursuant to ASC Subtopic 470-20, issuers of certain convertible debt instruments, such as the Notes, that have a net settlement feature and may be settled wholly or partially in cash upon conversion are required to separately account for the liability (debt) and equity (conversion option) components of the instrument. The carrying amount of the liability component of the instrument is computed by estimating the fair value of a similar liability without the conversion option using income and market based approaches. For the income-based approach, the Company uses a convertible bond pricing model that includes several assumptions such as volatility and the risk-free rate. For the market-based approach, the Company observes the price of derivative price instruments purchased in conjunction with our convertible senior note issuances or evaluates issuances of convertible debt securities by other companies with similar credit risk ratings at the time of issuance. The amount of the equity component is then calculated by deducting the fair value of the liability component from the principal amount of the instrument. The difference between the principal amount and the liability component represents a debt discount that is amortized to interest expense over the respective terms of the Notes using an effective interest rate method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the issuance costs related to the Notes, the allocation of issuance costs incurred between the liability and equity components were based on their relative values. Similarly, in accordance with ASC Subtopic 470-20, transactions involving contemporaneous exchanges of cash between the same debtor and creditor in connection with the issuance of a new debt obligation and satisfaction of an existing debt obligation by the debtor, such as the contemporaneous 2023 Notes Partial Repurchase and issuance of the 2025 Notes, should be evaluated as a modification or an exchange transaction depending on whether the exchange is determined to have substantially different terms. The 2023 Notes Partial Repurchase and issuance of the 2025 Notes were deemed to have substantially different terms due to the significant difference between the value of the conversion option immediately prior to and after the exchange, and consequently, the 2023 Notes Partial Repurchase was accounted for as a debt extinguishment. Pursuant to ASC Subtopic 470-20, total consideration for the 2023 Notes Partial Repurchase was separated into liability and equity components by estimating the fair value of a similar liability without a conversion option and assigning the residual value to the equity component. The effective interest rate used to estimate the fair value of the liability component of the 2023 Notes Partial Repurchase is based on the income and market based approaches used to determine the effective interest rate of the 2025 Notes, adjusted for the remaining tenor of the 2023 Notes. The gain or loss on extinguishment of the debt is subsequently determined by comparing repurchase consideration allocated to the liability component to the sum of the carrying value of the liability component, net of the proportionate amounts of unamortized debt discount and remaining unamortized debt issuance costs. Advertising Expenses Advertising costs are expensed as incurred. Advertising expense was $17.0 million , $10.0 million , and $9.4 million for the years ended January 31, 2020 , 2019 and 2018 . Income Taxes The Company accounts for income taxes in accordance with the liability method of accounting for income taxes. Under this method, the Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax basis of assets and liabilities, as well as for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. The Company records a valuation allowance to reduce its deferred tax assets to the net amount that the Company believes is more likely than not to be realized. In assessing the need for a valuation allowance, the Company has considered its historical levels of income, expectations of future taxable income and ongoing tax planning strategies. Because of the uncertainty of the realization of the deferred tax assets, the Company has recorded a full valuation allowance against its deferred tax assets. Realization of its deferred tax assets is dependent primarily upon future U.S. taxable income. The Company recognizes and measures tax benefits from uncertain tax positions using a two-step approach. The first step is to evaluate the tax position taken or expected to be taken by determining if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained in an audit, including resolution of any related appeals or litigation processes. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. Significant judgment is required to evaluate uncertain tax positions. Although the Company believes that it has adequately reserved for its uncertain tax positions, it can provide no assurance that the final tax outcome of these matters will not be materially different. The Company evaluates its uncertain tax position on a regular basis and evaluations are based on a number of factors, including changes in facts and circumstances, changes in tax law, correspondence with tax authorities during the course of an audit and effective settlement of audit issues. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on the Company’s financial condition and results of operations. The provision for income taxes includes the effects of any accruals that the Company believes are appropriate, as well as the related net interest and penalties. Concentrations of Risk and Significant Customers The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments and accounts receivable. Cash and cash equivalents and short-term investments are currently held in three financial institutions and, at times, may exceed federally insured limits. As of January 31, 2020 and 2019 and for each of the three years ended January 31, 2020 , no single customer represented greater than 10% of accounts receivable or greater than 10% of revenue, respectively. In order to reduce the risk of downtime of the Company’s subscription services, the Company uses data center facilities operated by a third party located in Virginia, Oregon, Ohio, Germany, Ireland, Singapore and Sydney. The Company has internal procedures to restore services in the event of disaster at any of its current data center facilities. Even with these procedures for disaster recovery in place, the Company’s subscription services could be significantly interrupted during the time period following a disaster at one of its sites and the subsequent restoration of services at another site. Geographical Information Revenue by location is determined by the billing address of the customer. The following table sets forth revenue by geographic area (in thousands): Year Ended January 31, 2020 2019 2018 United States $ 494,529 $ 337,367 $ 217,300 International 91,538 61,887 39,247 Total $ 586,067 $ 399,254 $ 256,547 Other than the United States, no individual country exceeded 10% of total revenue for the years ended January 31, 2020 , 2019 and 2018 . Property and equipment by geographic location is based on the location of the legal entity that owns the asset. As of January 31, 2020 and 2019 , substantially all of the Company’s property and equipment was located in the United States. Net Loss per Share The Company computes basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for participating securities. Under the two-class method, basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase, without consideration for potentially dilutive securities as they do not share in losses. The diluted net loss per share attributable to common stockholders is computed giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, unvested restricted stock units, or RSUs, purchase rights issued under the 2017 Employee Stock Purchase Plan, or ESPP, shares subject to repurchase from early exercised options, unvested common stock and restricted stock issued in connection with certain business combinations, convertible senior notes and warrants are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common stockholders as the effect is antidilutive. Since the Company's IPO, Class A and Class B common stock are the only outstanding equity of the Company. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion rights. See Note 13. Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases (Topic 842) , which requires lessees to record a right-of-use asset and a corresponding lease liability on their balance sheet for most leases. The Company adopted the requirements of ASC 842 as of February 1, 2019, using the modified retrospective method for leases that existed as of February 1, 2017, or were entered into thereafter. The modified retrospective method provides a method for recording existing leases at adoption and in comparative periods that approximates the results of a full retrospective approach. In order to simplify an entity’s transition, ASC 842 provides a package of three practical expedients, which must be elected together and applied consistently to all of an entity’s leases. The Company elected to use the package of practical expedients and, therefore, did not reassess: • whether contractual arrangements that expired prior to or existed as of February 1, 2017, are or contain leases, • the classification of leases that expired prior to or existed as of February 1, 2017, and • initial direct costs for leases that existed as of February 1, 2017. As of the later of February 1, 2017 or each lease’s respective commencement date, the Company recorded lease liabilities equal to the present value of the remaining minimum lease payments and right-of-use assets equal to the corresponding lease liability adjusted for (i) any prepaid or accrued lease payments, (ii) the remaining balance of any lease incentives received, (iii) unamortized initial direct costs and (iv) any impairments. The Company adjusted its consolidated balance sheet from amounts previously reported due to the adoption of ASC 842. Select consolidated balance sheet line items, which reflect the adoption of ASC 842, are as follows (in thousands): As of January 31, 2019 As Reported Adoption of ASC 842 As Adjusted Assets Current assets: Prepaid expenses and other current assets $ 29,451 $ (1,214 ) $ 28,237 Total current assets 709,330 (1,214 ) 708,116 Operating lease right-of-use assets — 121,389 121,389 Other noncurrent assets 15,286 (197 ) 15,089 Total assets $ 864,335 $ 119,978 $ 984,313 Liabilities and stockholders’ equity Current liabilities: Accrued expenses and other liabilities $ 24,740 $ 8,913 $ 33,653 Total current liabilities 564,191 8,913 573,104 Operating lease liabilities, noncurrent — 147,046 147,046 Other noncurrent liabilities 38,999 (35,981 ) 3,018 Total liabilities 611,958 119,978 731,936 Total liabilities and stockholders’ equity $ 864,335 $ 119,978 $ 984,313 The Company’s consolidated statements of cash flows reflect the adoption of ASC 842. The adoption of ASC 842 did not have an impact on cash provided by or used in operating, investing, or financing activities or on the Company’s condensed consolidated statements of operations. Recently Issued Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments, which changes the existing incurred loss impairment model for financial assets held at amortized cost. The new model uses a forward-looking expected loss method to calculate credit loss estimates. ASU 2016-13 also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. This guidance is effective for the Company on February 1, 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures and does not expect a material impact. In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15), which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. This guidance is effective for the Company on February 1, 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures and does not expect a material impact.

Business Combinations

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

Cash Equivalents and Short-term

Cash Equivalents and Short-term Investments	12 Months Ended
	Jan. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Cash Equivalents and Short-term Investments	Cash Equivalents and Short-term Investments The amortized cost, unrealized gain (loss) and estimated fair value of the Company’s cash equivalents and short-term investments as of January 31, 2020 and 2019 were as follows (in thousands): As of January 31, 2020 Amortized Cost Unrealized Gain Unrealized Loss Estimated Fair Value Cash equivalents: Money market funds $ 416,584 $ — $ — $ 416,584 U.S. treasury securities 19,996 — — 19,996 Total cash equivalents 436,580 — — 436,580 Short-term investments: U.S. treasury securities 575,920 686 (8 ) 576,598 Corporate debt securities 305,859 519 — 306,378 Total short-term investments 881,779 1,205 (8 ) 882,976 Total $ 1,318,359 $ 1,205 $ (8 ) $ 1,319,556 As of January 31, 2019 Amortized Cost Unrealized Gain Unrealized Loss Estimated Fair Value Cash equivalents: Money market funds $ 247,426 $ — $ — $ 247,426 Corporate debt securities 3,409 — (1 ) 3,408 Total cash equivalents 250,835 — (1 ) 250,834 Short-term investments: U.S. treasury securities 195,913 37 (53 ) 195,897 Corporate debt securities 69,483 13 (19 ) 69,477 Total short-term investments 265,396 50 (72 ) 265,374 Total $ 516,231 $ 50 $ (73 ) $ 516,208 All short-term investments were designated as available-for-sale securities as of January 31, 2020 and 2019 . The Company's short-term investments as of January 31, 2020 and 2019 all mature within one year, as follows (in thousands): As of January 31, 2020 As of January 31, 2019 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due within one year $ 881,779 $ 882,976 $ 265,396 $ 265,374 The Company had 7 and 34 short-term investments in unrealized loss positions as of January 31, 2020 and 2019 , respectively. There were no material gross unrealized gains or losses from available-for-sale securities and no material realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income for the years ended January 31, 2020 , 2019 and 2018 . For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) the Company has the intention to sell any of these investments and (ii) it is not more likely than not that the Company will be required to sell any of these available-for-sale debt securities before recovery of the entire amortized cost basis . Based on this evaluation, the Company determined that there were no other-than-temporary impairments associated with short-term investments as of January 31, 2020 and 2019

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Jan. 31, 2020
Fair Value Disclosures [Abstract]
Fairv value measurements	Fair Value Measurements The Company measures its financial assets at fair value each reporting period using a fair value hierarchy that prioritizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure as follows: Level 1-Valuations based on observable inputs that reflect quoted prices for identical assets or liabilities in active markets. Level 2-Valuations based on other inputs that are directly or indirectly observable in the marketplace. Level 3-Valuations based on unobservable inputs that are supported by little or no market activity. Assets and Liabilities Measured at Fair Value on a Recurring Basis The following table presents information about the Company’s financial assets that were measured at fair value on a recurring basis using the above input categories (in thousands): As of January 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 416,584 $ — $ — $ 416,584 U.S. treasury securities $ — $ 19,996 $ — 19,996 Total cash equivalents 416,584 19,996 — 436,580 Short-term investments: U.S. treasury securities — 576,598 — 576,598 Corporate debt securities — 306,378 — 306,378 Total short-term investments — 882,976 — 882,976 Total cash equivalents and short-term investments $ 416,584 $ 902,972 $ — $ 1,319,556 As of January 31, 2019 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 247,426 $ — $ — $ 247,426 Corporate debt securities — 3,408 — 3,408 Total cash equivalents 247,426 3,408 — 250,834 Short-term investments: U.S. treasury securities — 195,897 — $ 195,897 Corporate debt securities — 69,477 — 69,477 Total short-term investments — 265,374 — 265,374 Total cash equivalents and short-term investments $ 247,426 $ 268,782 $ — $ 516,208 The carrying amounts of certain financial instruments, including cash held in banks, accounts receivable and accounts payable approximate fair value due to their short-term maturities and are excluded from the fair value table above. Fair Value Measurements of Other Financial Instruments The following table presents the carrying amounts and estimated fair values of our financial instruments that are not recorded at fair value on the consolidated balance sheets (in thousands): As of January 31, 2020 Net Carrying Amount (1) Estimated Fair Value 2023 Convertible senior notes $ 102,543 $ 331,014 2025 Convertible senior notes $ 851,535 $ 1,074,840 (1) Before unamortized debt issuance costs. The difference between the principal amount of the 2023 Notes and the 2025 Notes, $120.6 million and $1,060.0 million , respectively, and the net carrying amounts before unamortized debt issuance costs represents the unamortized debt discount (See Note 9 for additional details). The estimated fair values of the Notes, which are Level 2 financial instruments, were determined based on the quoted bid prices of the Notes in an over-the-counter market on the last trading day of the reporting period. As of January 31, 2020 , the difference between the net carrying amount of the Notes and their estimated fair values represented the equity conversion value premium the market assigned to the Notes. Based on the closing price of our common stock of $128.05 on January 31, 2020 , the if-converted value of the 2023 Notes exceeded the principal amount of $120.6 million , while the if-converted value of the 2025 Notes was less than the principal amount of $1,060.0 million .

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, net	12 Months Ended
	Jan. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, net	Goodwill and Intangible Assets, net Goodwill As of January 31, 2020 and 2019 , goodwill was $48.0 million and $18.1 million , respectively. During the year ended January 31, 2020 , the Company recorded $29.9 million of goodwill in connection with the Azuqua acquisition that was completed in March 2019. See Note 3 for further details. No goodwill impairments were recorded during the years ended January 31, 2020 , 2019 and 2018 . Goodwill balances as of January 31, 2020 and 2019 were as follows (in thousands): Goodwill Balance at January 31, 2019 $ 18,089 Goodwill recorded in connection with Azuqua acquisition 29,934 Balance at January 31, 2020 $ 48,023 Intangible Assets, net Intangible assets consisted of the following (in thousands): As of January 31, 2020 Gross Accumulated Amortization Write-offs Net Capitalized internal-use software costs $ 24,890 $ (14,828 ) $ (119 ) $ 9,943 Purchased developed technology 28,800 (6,321 ) — 22,479 Software licenses 1,112 (1,005 ) — 107 $ 54,802 $ (22,154 ) $ (119 ) $ 32,529 As of January 31, 2019 Gross Accumulated Amortization Write-offs Net Capitalized internal-use software costs $ 19,838 $ (9,969 ) $ — $ 9,869 Purchased developed technology 4,600 (833 ) — 3,767 Software licenses 1,023 (762 ) — 261 $ 25,461 $ (11,564 ) $ — $ 13,897 The Company capitalized $5.1 million and $3.4 million of internal-use software costs during the years ended January 31, 2020 and 2019 , respectively, which included $1.2 million and $0.5 million of stock-based compensation costs, respectively. Amortization expense of capitalized internal-use software costs totaled $4.9 million , $4.8 million and $2.7 million during the years ended January 31, 2020 , 2019 and 2018 , respectively. The Company wrote-off an immaterial amount and $1.1 million of previously capitalized costs in the years ended January 31, 2020 and 2018 , respectively, as they were not realizable. The charges were recognized in research and development in the consolidated statements of operations. During the year ended January 31, 2020 , the Company recorded $24.2 million of purchased developed technology, of which $15.7 million related to the Azuqua acquisition (see Note 3 for further details), and the remainder was in connection with an asset acquisition in May 2019, whereby the Company recorded $8.5 million of purchased developed technology with an estimated useful life of five years. The remaining weighted-average useful life of all purchased developed technology was 3.9 and 2.5 years as of January 31, 2020 , and 2019 , respectively. Amortization expense of intangible assets for the years ended January 31, 2020 , 2019 and 2018 was $10.6 million , $5.8 million , and $2.9 million , respectively. As of January 31, 2020 , estimated remaining amortization expense for the intangible assets by fiscal year was as follows (in thousands): Remaining Amortization 2021 11,300 2022 8,403 2023 6,586 2024 5,356 2025 884 Total $ 32,529

Balance Sheet Components

Balance Sheet Components	12 Months Ended
	Jan. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components Property and Equipment, net Property and equipment consisted of the following (in thousands): As of January 31, 2020 2019 Computers and equipment $ 3,567 $ 3,668 Furniture and fixtures 11,014 11,012 Leasehold improvements 55,363 47,883 Property and equipment, gross 69,944 62,563 Less accumulated depreciation (16,409 ) (9,642 ) Property and equipment, net $ 53,535 $ 52,921 Depreciation expense was $8.8 million , $5.7 million and $4.0 million for the years ended January 31, 2020 , 2019 and 2018 , respectively. Allowances The Company’s accounts receivable allowances for the years ended January 31, 2020 , 2019 and 2018 were as follows (in thousands): As of January 31, 2020 2019 2018 Balance, beginning of period $ 2,098 $ 1,472 $ 1,306 (Reductions) additions (673 ) 888 431 Write-offs (259 ) (262 ) (265 ) Balance, end of period $ 1,166 $ 2,098 $ 1,472 Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following (in thousands): As of January 31, 2020 2019 (1) Accrued expenses 22,530 21,174 Accrued taxes payable 1,591 1,195 Operating lease liabilities 12,064 10,914 Other 702 370 Accrued expenses and other current liabilities $ 36,887 $ 33,653 (1) Adjusted for adoption of ASC 842. See Note 2. Other Liabilities, Noncurrent Other liabilities, noncurrent consisted of the following (in thousands): As of January 31, 2020 2019 (1) Deferred tax liabilities $ 1,558 $ 727 Other 3,803 2,291 Other liabilities, noncurrent $ 5,361 $ 3,018 (1) Adjusted for adoption of ASC 842. See Note 2.

Deferred Revenue and Performanc

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

Convertible Senior Notes, Net

Convertible Senior Notes, Net	12 Months Ended
	Jan. 31, 2020
Debt Disclosure [Abstract]
Convertible Senior Notes, Net	Convertible Senior Notes, Net 2023 Convertible Senior Notes The 2023 Notes are senior, unsecured obligations of the Company, and bear interest at a fixed rate of 0.25% per year. Interest is payable in cash semi-annually in arrears on February 15 and August 15 of each year, beginning on August 15, 2018. The 2023 Notes mature on February 15, 2023 unless earlier repurchased or converted. The Company may not redeem the 2023 Notes prior to maturity. The total net proceeds from the 2023 Notes, after deducting initial purchasers’ discounts and debt issuance costs, was $335.0 million . In September 2019, the Company used part of the net proceeds from the issuance of the 2025 Notes for the 2023 Notes Partial Repurchase, which consisted of a repurchase of $224.4 million aggregate principal amount of the 2023 Notes in privately-negotiated transactions for aggregate consideration of $604.8 million , consisting of approximately $224.4 million in cash and approximately 3.0 million shares of Class A common stock. Of the $604.8 million in aggregate consideration, $197.7 million and $407.1 million were allocated to the debt and equity components, respectively, using an effective interest rate of 4.00% to determine the fair value of the liability component. This interest rate was based on the income and market based approaches used to determine the effective interest rate of the 2025 Notes, adjusted for the remaining tenor of the 2023 Notes. As of the repurchase date, the carrying value of the notes subject to the 2023 Notes Partial Repurchase, net of unamortized debt discount and issuance costs, was $183.1 million . The 2023 Notes Partial Repurchase resulted in a $14.6 million loss on early debt extinguishment, of which $3.8 million consisted of unamortized debt issuance costs. As of January 31, 2020 , $120.6 million of principal remained outstanding on the 2023 Notes. The terms of the 2023 Notes are governed by an Indenture by and between the Company and Wilmington Trust, National Association, as Trustee (the Indenture). Upon conversion, the 2023 Notes may be settled in cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at the Company’s election. The 2023 Notes are convertible at an initial conversion rate of 20.6795 shares of Class A common stock per $1,000 principal amount of the 2023 Notes, which is equal to an initial conversion price of approximately $48.36 per share of Class A common stock, subject to adjustment under certain circumstances in accordance with the terms of the Indenture. Prior to the close of business on the business day immediately preceding October 15, 2022, holders of the 2023 Notes may convert all or a portion of their 2023 Notes only in multiples of $1,000 principal amount, under the following circumstances: • during any fiscal quarter commencing after the fiscal quarter ending on April 30, 2018 (and only during such fiscal quarter), if the last reported sale price of Class A common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the 2023 Notes on each applicable trading day; • during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the 2023 Notes for each trading day of that five consecutive trading day period was less than 98% of the product of the last reported sale price of Class A common stock and the conversion rate on such trading day; or • upon the occurrence of specified corporate events, as described in the Indenture. On or after October 15, 2022 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2023 Notes regardless of the foregoing circumstances. For at least twenty trading days during the period of thirty consecutive trading days ended January 31, 2020 , the last reported sale price of the Company’s common stock was equal to or exceeded 130% of the conversion price of the 2023 Notes on each applicable trading day. As a result, the 2023 Notes are convertible at the option of the holders during the fiscal quarter ending April 30, 2020 and were classified as current liabilities on the consolidated balance sheet as of January 31, 2020 . In addition, as of the date of this filing, the Company has received an immaterial amount of conversion requests and holders of the 2023 Notes have converted an immaterial amount of such notes (which was not in connection with the 2023 Notes Partial Repurchase). Holders of the 2023 Notes who convert their 2023 Notes in connection with certain corporate events that constitute a make-whole fundamental change (as defined in the Indenture) are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a fundamental change (as defined in the Indenture), holders of the 2023 Notes may require the Company to repurchase all or a portion of their 2023 Notes at a price equal to 100% of the principal amount of the 2023 Notes being repurchased, plus any accrued and unpaid interest. In accounting for the issuance of the 2023 Notes, the Company separated the 2023 Notes into liability and equity components, utilizing an effective interest rate of 5.68% to determine the fair value of the liability component. This interest rate was based on both an income and a market based approach. For the income approach, the Company used a convertible bond pricing model, which included several assumptions including volatility and the risk-free rate. For the market approach, the Company observed the price of the Note Hedge (see below) it purchased for its 2023 Notes and also performed an evaluation of issuances of convertible debt securities by other companies with similar credit risk ratings at the time of issuance. The following table sets forth total interest expense recognized related to the 2023 Notes (in thousands): Year Ended January 31, 2020 2019 Contractual interest expense $ 606 $ 793 Amortization of debt issuance costs 985 1,085 Amortization of debt discount 11,219 13,194 Total $ 12,810 $ 15,072 Total issuance costs of $10.0 million related to the 2023 Notes were allocated between liability and equity in the same proportion as the allocation of the total proceeds to the liability and equity components. Issuance costs attributable to the liability component are being amortized to interest expense over the respective term of the 2023 Notes using the effective interest rate method. The issuance costs attributable to the equity component were netted against the respective equity component in Additional paid-in capital. The Company recorded liability issuance costs of $7.7 million and equity issuance costs of $2.3 million . The 2023 Notes, net consisted of the following (in thousands): As of January 31, 2020 Liability component: Principal $ 120,588 Less: unamortized debt issuance costs and debt discount (19,885 ) Net carrying amount $ 100,703 Equity component: 2023 Notes $ 27,949 Less: issuance costs (811 ) Carrying amount of the equity component (1) $ 27,138 (1) Included in the consolidated balance sheets within Additional paid-in capital. Note Hedges In connection with the pricing of the 2023 Notes, the Company entered into convertible note hedge transactions with respect to its Class A common stock (Note Hedges). The Note Hedges are purchased call options that give the Company the option to purchase, subject to anti-dilution adjustments substantially identical to those in the 2023 Notes, approximately 7.1 million shares of its Class A common stock for approximately $48.36 per share (subject to adjustment), corresponding to the approximate initial conversion price of the 2023 Notes, exercisable upon conversion of the 2023 Notes. The Note Hedges will expire in 2023, if not exercised earlier. The Note Hedges are intended to offset potential dilution to the Company’s Class A common stock and/or offset the potential cash payments that the Company could be required to make in excess of the principal amount upon any conversion of the 2023 Notes under certain circumstances. The Note Hedges are separate transactions and are not part of the terms of the 2023 Notes. The Company paid an aggregate amount of $80.0 million for the Note Hedges. The amount paid for the Note Hedges was recorded as a reduction to Additional paid-in capital in the consolidated balance sheets. In September 2019, and in connection with the 2023 Notes Partial Repurchase, the Company terminated Note Hedges corresponding to approximately 4.6 million shares for cash proceeds of $405.9 million . The proceeds were recorded as an increase to Additional paid-in capital in the consolidated balance sheets. As of January 31, 2020 , Note Hedges giving the Company the option to purchase approximately 2.5 million shares (subject to adjustment) remained outstanding. Warrants In connection with the issuance of the 2023 Notes, the Company also entered into separate warrant transactions pursuant to which it sold net-share-settled (or, at the Company’s election subject to certain conditions, cash-settled) warrants to acquire, subject to anti-dilution adjustments, up to approximately 7.1 million shares over 80 scheduled trading days beginning in May 2023 of the Company’s Class A common stock at an initial exercise price of approximately $68.06 per share (subject to adjustment). If the Warrants are not exercised on their exercise dates, they will expire. If the market value per share of the Company’s Class A common stock exceeds the applicable exercise price of the Warrants, the Warrants could have a dilutive effect on the Company’s Class A common stock unless, subject to the terms of the Warrants, the Company elects to cash settle the Warrants. The Warrants are separate transactions and are not part of the terms of the 2023 Notes or the Note Hedges. The Company received aggregate proceeds of $52.4 million from the sale of the Warrants in connection with the 2023 Notes. The proceeds from the sale of the Warrants were recorded as an increase to Additional paid-in capital in the consolidated balance sheets. In September 2019, and in connection with the 2023 Notes Partial Repurchase, the Company terminated Warrants corresponding to approximately 4.6 million shares for total cash payments of $358.6 million . The termination payment was recorded as a decrease to Additional paid-in capital in the consolidated balance sheets. As of January 31, 2020 , Warrants to acquire up to approximately 2.5 million shares (subject to adjustment) remained outstanding. 2025 Convertible Senior Notes The 2025 Notes are senior, unsecured obligations of the Company, and bear interest at a fixed rate of 0.125% per year. Interest is payable in cash semi-annually in arrears on March 1 and September 1 of each year, beginning on March 1, 2020. The 2025 Notes mature on September 1, 2025 unless earlier redeemed, repurchased or converted. The total net proceeds from the 2025 Notes, after deducting initial purchasers’ discounts and debt issuance costs, were $1,040.7 million . The terms of the 2025 Notes are governed by an Indenture by and between the Company and Wilmington Trust, National Association, as Trustee (the Indenture). Upon conversion, the 2025 Notes may be settled in cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at the Company’s election. The 2025 Notes are convertible at an initial conversion rate of 5.2991 shares of class A common stock per $1,000 principal amount of the 2025 Notes, which is equal to an initial conversion price of approximately $188.71 per share of Class A common stock, subject to adjustment under certain circumstances in accordance with the terms of the Indenture. Prior to the close of business on the business day immediately preceding June 1, 2025, holders of the 2025 Notes may convert all or a portion of their 2025 Notes only in multiples of $1,000 principal amount, under the following circumstances: • during any fiscal quarter commencing after the fiscal quarter ending on January 31, 2020 (and only during such fiscal quarter), if the last reported sale price of Class A common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the 2025 Notes on each applicable trading day; • during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the 2025 Notes for each trading day of that five consecutive trading day period was less than 98% of the product of the last reported sale price of Class A common stock and the conversion rate on such trading day; • if the Company calls the notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or • upon the occurrence of specified corporate events, as described in the Indenture. On or after June 1, 2025 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2025 Notes regardless of the foregoing circumstances. During the year ended January 31, 2020 , the conditions allowing holders of the 2025 Notes to convert were not met. The Company may redeem for cash all or any portion of the 2025 Notes, at its option, on or after September 6, 2022, if the last reported sale price of the Company’s Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on and including the trading day preceding the date on which the Company provides notice of redemption at a redemption price equal to 100% of the principal amount of the 2025 Notes to be redeemed, plus any accrued and unpaid interest to, but excluding, the redemption date. During the year ended January 31, 2020 , the Company had not redeemed any of the 2025 Notes. Holders of the 2025 Notes who convert their 2025 Notes in connection with certain corporate events that constitute a make-whole fundamental change (as defined in the Indenture) or in connection with the Company’s issuance of a redemption notice are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a fundamental change (as defined in the Indenture), holders of the 2025 Notes may require the Company to repurchase all or a portion of their 2025 Notes at a price equal to 100% of the principal amount of the 2025 Notes being repurchased, plus any accrued and unpaid interest. In accounting for the issuance of the 2025 Notes, the Company separated the 2025 Notes into liability and equity components utilizing an effective interest rate of 4.10% to determine the fair value of the liability component. This interest rate was based on both an income and a market based approach. For the income approach, the Company used a convertible bond pricing model, which included several assumptions including volatility and the risk-free rate. For the market approach, the Company performed an evaluation of issuances of convertible debt securities by other companies with similar credit risk ratings at the time of issuance. The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands): Year Ended January 31, 2020 Contractual interest expense $ 519 Amortization of debt issuance costs 769 Amortization of debt discount 12,919 Total $ 14,207 Total issuance costs of $19.3 million related to the 2025 Notes were allocated between liability and equity in the same proportion as the allocation of the total proceeds to the liability and equity components. Issuance costs attributable to the liability component are being amortized to interest expense over the respective term of the 2025 Notes using the effective interest rate method. The issuance costs attributable to the equity component were netted against the respective equity component in Additional paid-in capital. The Company recorded liability issuance costs of $15.3 million and equity issuance costs of $4.0 million . The 2025 Notes, net consisted of the following (in thousands): As of January 31, 2020 Liability component: Principal $ 1,060,000 Less: unamortized debt issuance costs and debt discount (222,998 ) Net carrying amount $ 837,002 Equity component: 2025 Notes $ 221,387 Less: issuance costs (4,040 ) Carrying amount of the equity component (1) $ 217,347 (1) Included in the consolidated balance sheets within Additional paid-in capital. Capped Calls In connection with the pricing of the 2025 Notes, the Company entered into capped call transactions with respect to its Class A common stock (Capped Calls). The Capped Calls are purchased call options that give the Company the option to purchase, subject to anti-dilution adjustments substantially identical to those in the 2025 Notes, approximately 5.6 million shares of its Class A common stock for approximately $188.71 per share (subject to adjustment), corresponding to the approximate initial conversion price of the 2025 Notes, exercisable upon conversion of the 2025 Notes. The Capped Calls have initial cap prices of $255.88 per share (subject to adjustment) and will expire in 2025, if not exercised earlier. The Capped Calls are intended to offset potential dilution to the Company’s Class A common stock and/or offset the potential cash payments that the Company could be required to make in excess of the principal amount upon any conversion of the 2025 Notes under certain circumstances. The Capped Calls are separate transactions and are not part of the terms of the 2025 Notes. The Company paid an aggregate amount of $74.1 million for the Capped Calls. The amount paid for the Capped Calls was recorded as a reduction to Additional paid-in capital in the consolidated balance sheets.

Leases Leases

Leases Leases	12 Months Ended
	Jan. 31, 2020
Leases [Abstract]
Leases	Leases The Company has entered into various non-cancelable office space operating leases with original lease periods expiring between 2020 and 2028. These leases do not contain material variable rent payments, residual value guarantees, covenants or other restrictions. The Company's corporate headquarters lease in San Francisco has a 10 year term, which expires in October 2028. The Company is entitled to two five -year options to extend this lease, subject to certain requirements. The Company has various sublease agreements with third parties. The subleases have remaining lease terms of between five months and five years. Sublease income, which is recorded as a reduction of rental expense, was $3.2 million for the year ended January 31, 2020 and nil for each of the years ended January 31, 2019 and 2018 . Operating lease costs were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Operating lease costs (1) $ 23,193 $ 23,290 $ 10,588 (1) Amounts are presented exclusive of sublease income and include short-term leases, which are immaterial. The weighted-average remaining term of the Company’s operating leases was 7.9 years and 8.9 years and the weighted-average discount rate used to measure the present value of the operating lease liabilities was 5.7% and 5.8% as of January 31, 2020 and January 31, 2019 , respectively. Maturities of the Company’s operating lease liabilities, which do not include short-term leases, as of January 31, 2020 were as follows (in thousands): Operating Leases 2021 $ 21,225 2022 27,512 2023 27,532 2024 28,110 2025 25,768 Thereafter 81,209 Total lease payments 211,356 Less imputed interest (44,781 ) Total operating lease liabilities $ 166,575 Cash payments included in the measurement of the Company’s operating lease liabilities were $18.3 million and $12.9 million for the years ended January 31, 2020 and January 31, 2019 , respectively. As of January 31, 2020 , the Company has $56.9 million of undiscounted future payments under various operating leases that have not yet commenced, which are excluded from the table above. These operating leases will commence in fiscal 2021 and have lease terms between 1.3 years and 8.7 years .

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Jan. 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 $11.9 million and $12.7 million were issued and outstanding as of January 31, 2020 and 2019 , respectively. No draws have been made under such letters of credit. Purchase Obligations As of January 31, 2020 , future minimum purchase obligations, such as data center operations and sales and marketing activities, were as follows (in thousands): Purchase Obligations 2021 $ 56,413 2022 39,110 2023 30,398 2024 30,000 Total contractual obligations $ 155,921 Legal Matters From time to time in the normal course of business, the Company may be subject to various legal matters such as threatened or pending claims or proceedings. There were no such material matters as of January 31, 2020 and 2019 . Warranties and Indemnification The Company’s subscription services are generally warranted to perform materially in accordance with the Company’s online help documentation under normal use and circumstances. Additionally, the Company’s arrangements generally include provisions for indemnifying customers against liabilities if its subscription services infringe a third party’s intellectual property rights. Furthermore, the Company may also incur liabilities if it breaches the security or confidentiality obligations in its arrangements. To date, the Company has not incurred significant costs and has not accrued a liability in the accompanying consolidated financial statements as a result of these obligations.

Common Stock and Stockholders'

Common Stock and Stockholders' Equity	12 Months Ended
	Jan. 31, 2020
Equity [Abstract]
Common Stock and Stockholders' Equity	Common Stock and Stockholders' Equity Common Stock Holders of Class A and Class B common stock are entitled to one vote per share and 10 votes per share, respectively, and the shares of Class A common stock and Class B common stock are identical, except for voting and conversion rights. Shares of Class B common stock may be converted into Class A common stock at any time at the option of the stockholder on a one -for-one basis, and are automatically converted into Class A common stock upon sale or transfer, subject to certain limited exceptions. Shares of Class A common stock are not convertible. In September 2019, in connection with the 2023 Notes Partial Repurchase, the Company issued approximately 3.0 million shares of Class A common stock. See Note 9 for additional details. As of January 31, 2020 , shares of common stock reserved for future issuance were as follows: As of January 31, 2020 Options and unvested RSUs outstanding 17,252,543 Available for future stock option and RSU grants 16,456,003 Available for ESPP 3,653,857 37,362,403 Awards Issued as Charitable Contributions During the years ended January 31, 2020 , 2019 and 2018 , the Company issued 15,000 , 20,000 and 24,287 shares, respectively, of Class A common stock as charitable contributions and recognized $1.7 million , $1.0 million and $0.7 million

Employee Incentive Plans

Employee Incentive Plans	12 Months Ended
	Jan. 31, 2020
Share-based Payment Arrangement [Abstract]
Employee Incentive Plans	Employee Incentive Plans The Company’s equity incentive plans provide for granting stock options, RSUs and restricted stock awards to employees, consultants, officers and directors. In addition, the Company offers an ESPP to eligible employees. Stock-based compensation expense by award type was as follows (in thousands): Year Ended January 31, 2020 2019 2018 Stock options $ 21,888 $ 23,466 $ 24,186 RSUs 94,637 41,637 9,104 ESPP 9,408 7,248 7,111 Restricted stock awards 590 1,608 3,281 Restricted common stock 101 2,361 6,178 Total $ 126,624 $ 76,320 $ 49,860 Stock-based compensation expense was recorded in the following cost and expense categories in the Company’s consolidated statements of operations (in thousands): Year Ended January 31, 2020 2019 2018 Cost of revenue: Subscription $ 12,923 $ 7,837 $ 4,600 Professional services and other 7,164 4,983 3,137 Research and development 37,683 22,642 18,107 Sales and marketing 38,077 22,916 13,242 General and administrative 30,777 17,942 10,774 Total $ 126,624 $ 76,320 $ 49,860 Stock-based compensation expense recorded to research and development in the consolidated statements of operations exclude amounts that were capitalized related to internal-use software for the years ended January 31, 2020 , 2019 and 2018 . See Note 6 for additional details. Equity Incentive Plans The Company has two equity incentive plans: the 2009 Stock Plan (2009 Plan) and the 2017 Equity Incentive Plan (2017 Plan). All shares that remain available for future grants are under the 2017 Plan. As of January 31, 2020 , options to purchase 11,348,049 shares of Class B common stock and 1,011,253 shares of Class A common stock remained outstanding. As of January 31, 2020 , the total number of shares reserved for future Class A stock grants under the 2017 Plan was 16,456,003 shares, including shares transferred from the 2009 Plan. Stock Options Options issued to new employees under the Plan generally are exercisable for periods not to exceed ten years and generally vest over four years with 25% vesting after one year and with the remainder vesting monthly thereafter in equal installments. Shares offered under the Plan may be: (i) authorized but unissued shares or (ii) treasury shares. A summary of the Company’s stock option activity and related information was as follows: Number of Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding as of January 31, 2019 17,803,794 $ 9.16 7.1 $ 1,304,446 Granted 415,547 82.33 Exercised (5,422,281 ) 8.37 Canceled (437,758 ) 13.35 Outstanding as of January 31, 2020 12,359,302 $ 11.82 6.2 $ 1,436,487 As of January 31, 2020: Vested and expected to vest 12,359,302 $ 11.82 6.2 $ 1,436,487 Vested and exercisable 8,723,638 $ 8.16 5.9 $ 1,045,852 The weighted-average grant-date fair value of options granted was $37.35 , $17.21 and $5.40 during the years ended January 31, 2020 , 2019 and 2018 , respectively. The total grant-date fair value of stock options vested was $23.7 million , $23.8 million and $23.9 million during the years ended January 31, 2020 , 2019 and 2018 , respectively. The intrinsic value of the options exercised, which represents the difference between the fair market value of the Company’s common stock on the date of exercise and the exercise price of each option, was $558.6 million , $309.3 million and $204.8 million for the years ended January 31, 2020 , 2019 and 2018 , respectively. As of January 31, 2020 and January 31, 2019 , there was a total of $28.2 million and $37.3 million , respectively, of unrecognized stock-based compensation expense, which is being recognized over a weighted-average period of 1.4 and 1.9 years , respectively. The Company used the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions: Year Ended January 31, 2020 2019 2018 Expected volatility 43 % 40 % 40% - 41% Expected term (in years) 6.3 6.3 6.3 - 6.4 Risk-free interest rate 1.55% - 2.27% 2.70 % 1.87% - 2.21% Expected dividend yield — — — Restricted Stock Units A summary of the Company’s RSU activities and related information is as follows: Number of Weighted- Outstanding as of January 31, 2019 4,835,536 $ 44.49 Granted 2,458,095 114.07 Vested (1,752,333 ) 44.69 Forfeited (648,057 ) 54.94 Outstanding as of January 31, 2020 4,893,241 $ 77.99 The Company granted 2,458,095 RSUs with an aggregate fair value of $280.4 million for the year ended January 31, 2020 . As of January 31, 2020 , there was $335.9 million of unrecognized stock-based compensation expense related to unvested RSUs, which is being recognized over a weighted-average period of 2.7 years based on vesting under the award service conditions. Equity Awards Issued in Connection with Business Combinations In connection with the Stormpath transaction in February 2017, the Company issued 800,000 shares of restricted common stock to Stormpath with an aggregate fair value of $8.6 million , of which 400,000 shares vested during each year ended January 31, 2020 and January 31, 2019 . The stock-based compensation expense related to the restricted common stock was recognized using an accelerated attribution method over two years. The Company separately entered into retention arrangements with certain employees of Stormpath and issued 598,500 restricted stock awards with performance conditions under the 2009 Plan, with an aggregate fair value of $6.6 million . The restricted stock awards vest ratably over two or three years from the transaction date, and 210,850 of these shares vested during each of the years ended January 31, 2020 and 2019. Additionally, the Company granted 518,900 service-based stock options under the 2009 Plan to certain Stormpath employees with an aggregate fair value of $2.5 million to vest ratably over the requisite four -year service period. Of the $9.1 million total aggregate fair value of the awards, $1.5 million is related to pre-combination service and was recognized as goodwill. The post-combination expenses for the restricted stock awards and stock options are $5.5 million and $2.1 million , respectively. The expense related to the restricted stock awards is being recognized over two or three years based on an accelerated attribution method. The expense for the stock options is being recognized ratably over the requisite service period. As of January 31, 2020 , the remaining unrecognized compensation cost was immaterial. Employee Stock Purchase Plan In February 2017, the Company’s board of directors adopted, and in March 2017, the Company’s stockholders approved the ESPP, which became effective prior to the completion of the IPO. The ESPP initially reserves and authorizes the issuance of up to a total of 3,000,000 shares of Class A common stock to participating employees. Except for the initial offering period which began April 7, 2017 and ended on June 20, 2018, or stock price changes that would reset the offering period after the initial six-month purchase period, the ESPP provides for 12 -month offering periods beginning June 21 and December 21 of each year, and each offering period consists of up to two six -month purchase periods. The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions: Year Ended January 31, 2020 2019 2018 Expected volatility 43% - 59% 39% - 70% 32% - 38% Expected term (in years) 0.5 - 1.0 0.5 - 1.0 0.5 - 1.2 Risk-free interest rate 1.53% - 2.05% 2.12% - 2.62% 0.95% - 1.73% Expected dividend yield — — — During the year ended January 31, 2020 , the Company's employees purchased 322,795 shares of its Class A common stock under the ESPP. The shares were purchased at a weighted-average purchase price of $58.14 , with proceeds of $18.8 million . During the year ended January 31, 2019 , the Company's employees purchased 615,210 shares of its Class A common stock under the ESPP. The shares were purchased at a weighted-average purchase price of $22.31 with proceeds of $13.7 million . As of January 31, 2020 , there was $8.8 million of unrecognized stock-based compensation expense related to the ESPP that is expected to be recognized over an average vesting period of 0.6 years .

Income Taxes

Income Taxes	12 Months Ended
	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The domestic and foreign components of pre-tax loss for the years ended January 31, 2020 , 2019 and 2018 were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Domestic $ (220,846 ) $ (128,214 ) $ (112,858 ) Foreign 10,514 2,700 2,688 Loss before benefit from income taxes $ (210,332 ) $ (125,514 ) $ (110,170 ) The components of the benefit from income taxes for the years ended January 31, 2020 , 2019 and 2018 were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Current: Federal $ 33 $ — $ — State 86 61 — Foreign 822 667 183 Total current provision for income taxes 941 728 183 Deferred: Federal (518 ) (620 ) (32 ) State (406 ) (130 ) 10 Foreign (1,436 ) 5 (482 ) Total deferred benefit from income taxes (2,360 ) (745 ) (504 ) Total benefit from income taxes $ (1,419 ) $ (17 ) $ (321 ) For the tax year ended January 31, 2020 the income tax benefit resulted from the release of valuation allowance in the United States in connection with the Azuqua acquisition and excess tax benefits from stock-based compensation in the United Kingdom. For the tax year ended January 31, 2019, the income tax benefit resulted from the release of valuation allowance in the United States in connection with the ScaleFT acquisition and excess tax benefits from stock-based compensation in the United Kingdom. The income tax benefits in the years ended January 31, 2020 and 2019 were partially offset by foreign income taxes, state taxes and tax amortization of goodwill. For the year ended January 31, 2018, the income tax benefit resulted from $1.3 million of excess tax deductions related to option exercises by foreign employees, a portion of which we used to claim a refund for taxes paid in prior years . The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended January 31, 2020 , 2019 and 2018 : Year Ended January 31, 2020 2019 2018 Tax at federal statutory rate 21.0 % 21.0 % 33.8 % State income taxes, net of federal benefit 4.0 3.8 3.4 Change in valuation allowance (100.1 ) (68.5 ) (27.1 ) Stock-based compensation 59.8 45.5 42.4 Research and development credits 18.0 — — Tax Cuts and Jobs Act of 2017 — — (51.3 ) Other, net (2.0 ) (1.8 ) (0.9 ) Effective tax rate 0.7 % — % 0.3 % The tax effects of temporary differences and related deferred tax assets and liabilities as of January 31, 2020 and 2019 were as follows (in thousands): As of January 31, 2020 2019 As Adjusted (1) Deferred tax assets: Net operating loss carryforwards $ 370,705 $ 202,471 Stock-based compensation 18,680 13,185 Deferred revenue 1,960 1,312 Operating lease liabilities 42,073 39,060 Other reserves and accruals 6,414 3,750 Research and development and other credits 39,918 791 Convertible debt — 477 Disallowed interest 4,507 1,292 Total deferred tax assets 484,257 262,338 Valuation allowance (361,606 ) (203,899 ) Total deferred tax assets, net 122,651 58,439 Deferred tax liabilities: Convertible debt (50,963 ) — Deferred commissions (27,569 ) (19,424 ) Capitalized internal-use software costs (2,248 ) (2,047 ) Goodwill (262 ) (217 ) Operating lease right-of-use assets (31,165 ) (29,697 ) Depreciation and amortization (8,315 ) (6,492 ) Total deferred tax liabilities (120,522 ) (57,877 ) Net deferred tax assets $ 2,129 $ 562 (1) Adjusted for adoption of ASC 842. See Note 2. As a result of continuing losses, the Company has determined that it is not more likely than not that it will realize the benefits of the U.S. deferred tax assets and, therefore, the Company has recorded a valuation allowance to reduce the carrying value of the U.S. deferred tax assets, net of U.S. deferred tax liabilities, to approximately zero. The U.S. valuation allowance increased by $157.7 million and $86.6 million during the years ended January 31, 2020 and 2019 , respectively. As of January 31, 2020 , the Company had approximately $1,462.6 million of federal and $919.5 million of state net operating loss carryforwards available to offset future taxable income. If not used, the federal and state net operating loss carryforwards will begin to expire in 2029 and 2021, respectively. As of January 31, 2020 , the Company had approximately $29.9 million of UK net operating losses which do not expire. As of January 31, 2020 , the Company had federal research and development tax credit carryforwards of $35.3 million and California research and development tax credit carryforwards of $23.4 million . The federal research and development credits will start to expire in 2030 while the California research and development credits do not expire. The Company also had California Enterprise Zone credits of $1.0 million that begin to expire in 2023. The Company’s ability to use the net operating loss and tax credit carryforwards in the future may be subject to substantial restrictions in the event of past or future ownership changes as defined in Section 382 of the Internal Revenue Code and similar state tax laws. The Company attributes net revenue, costs and expenses to domestic and foreign components based on the terms of its agreements with its subsidiaries. The Company does not provide for federal income taxes on the undistributed earnings of its foreign subsidiaries as such earnings are to be reinvested offshore indefinitely. If the Company repatriated these earnings, the resulting income tax liability would be insignificant. The Company is subject to taxation in the United States and various states and foreign jurisdictions. On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (“Tax Act”) was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease to effective for tax years beginning after December 31, 2017. This change in tax rate resulted in a reduction in the Company's net U.S. deferred tax assets before valuation allowance by $56.5 million , which was fully offset by a reduction in the Company's valuation allowance. A reconciliation of beginning and ending amount of unrecognized tax benefit was as follows (in thousands): Year Ended January 31, 2020 2019 2018 Gross amount of unrecognized tax benefits as of the beginning of the year $ 23,931 $ 11,719 $ 5,775 Additions based on tax positions related to a prior year 658 1,859 — Additions based on tax positions related to current year 6,866 10,353 5,944 Reductions based on tax positions related to current year — — — Reductions based on tax positions taken in a prior year (15,468 ) — — Gross amount of unrecognized tax benefits as of the end of the year $ 15,987 $ 23,931 $ 11,719 The Company is subject to taxation in the U.S. and various other state and foreign jurisdictions. As the Company has net operating loss carryforwards for U.S. federal and state jurisdictions, the statute of limitations is open for all years. For material foreign jurisdictions, the tax years open to examination include the tax years 2015 and forward. As of January 31, 2020 , 2019 and 2018 , the Company had unrecognized tax benefits which would not impact the effective tax rate because of the valuation allowance. The Company's policy is to include interest and penalties related to unrecognized tax benefits within the provision for income taxes. The Company did not have any uncertain tax positions as of January 31, 2020 for which it was reasonably possible that the positions will increase or decrease within the next twelve months. As of January 31, 2020 and 2019 , the Company had no

Net Loss Per Share

Net Loss Per Share	12 Months Ended
	Jan. 31, 2020
Earnings Per Share [Abstract]
Net Loss Per Share	Net Loss Per Share The Company computes net loss per share of common stock in conformity with the two-class method required for participating securities. The Company considers all series of preferred stock to be participating securities as the holders of the preferred stock are entitled to receive a non-cumulative dividend on a pari passu basis in the event that a dividend is paid on the common stock. The holders of the preferred stock do not have a contractual obligation to share in the Company’s losses. As such, the Company’s net loss for the year ended January 31, 2018 was not allocated to these participating securities. Upon the closing of the IPO in April 2017, all shares of the Company’s then-outstanding redeemable convertible preferred stock automatically converted into the Company’s common stock. The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data): Year Ended January 31, 2020 2019 2018 Class A Class B Class A Class B Class A Class B Numerator: Net loss $ (192,138 ) $ (16,775 ) $ (107,926 ) $ (17,571 ) $ (31,980 ) $ (77,869 ) Denominator: Weighted-average shares outstanding, basic and diluted 107,809 9,412 92,452 15,052 24,165 58,839 Net loss per share, basic and diluted $ (1.78 ) $ (1.78 ) $ (1.17 ) $ (1.17 ) $ (1.32 ) $ (1.32 ) As the Company was in a loss position for all periods presented, basic net loss per share is the same as diluted net loss per share as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Issued and outstanding stock options 12,359 17,804 24,917 Unvested RSUs issued and outstanding 4,893 4,836 2,863 Unvested restricted stock awards issued and outstanding 177 388 599 Unvested shares subject to repurchase 5 48 188 Unvested restricted common stock issued and outstanding — 400 800 Shares committed under the ESPP 253 271 1,149 Shares related to 2023 convertible senior notes 2,494 7,134 — Shares subject to warrants related to the issuance of 2023 convertible senior notes 2,494 — — Shares related to 2025 convertible senior notes 5,617 — — 28,292 30,881 30,516 The Company uses the if-converted method for calculating any potential dilutive effect of the conversion options embedded in the Notes on diluted net income per share, if applicable. The conversion options of the 2023 and 2025 Notes and exercise rights of the Warrants will have a dilutive impact on net income per share of common stock when the average market price per share of the Company’s Class A common stock for a given period exceeds the conversion prices of $48.36 per share, $188.71 per share and exercise price of $68.06 per share, respectively. During the year ended January 31, 2020 , the weighted average price per share of the Company’s Class A common stock exceeded the conversion price of the 2023 Notes and the exercise price of the Warrants; however, since the Company was in a net loss position there was no dilutive effect during any period presented.

Subsequent Events

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

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	The accompanying consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP).
Principles of Consolidation	All intercompany balances and transactions have been eliminated in consolidation. Certain reclassifications of prior period amounts have been made in our consolidated balance sheets and consolidated statement of cash flows to conform to the current period presentation. We reclassified $14.8 million of certain accrued accounts payable to accrued expenses as of January 31, 2019. These reclassifications had no impact on net loss, stockholders’ equity or cash flows as previously reported.
Fiscal Period	The Company’s fiscal year ends on January 31. References to fiscal 2020 , for example, refer to the fiscal year ended January 31, 2020 .
Use of Estimates	The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The Company bases its estimates on historical experience and on other assumptions that its management believes are reasonable under the circumstances. Actual results could vary from those estimates. The Company’s most significant estimates include the stand alone selling price (SSP) for each distinct performance obligation included in customer contracts with multiple performance obligations, the determination of the period of benefit for deferred commissions, the determination of the effective interest rate of the liability components of our convertible senior notes, the determination of the incremental borrowing rate used for operating lease liabilities, the valuation of deferred income tax assets and the valuation of acquired intangible assets.
Foreign Currency	The functional currencies of the Company’s foreign subsidiaries are the respective local currencies. Translation adjustments arising from the use of differing exchange rates from period to period are included in accumulated other comprehensive loss within the consolidated statements of redeemable convertible preferred stock and stockholders’ equity (deficit). Foreign currency transaction gains and losses are included in other expense, net in the consolidated statements of operations and were not material for the years ended January 31, 2020 , 2019 or 2018
Segment Information	The Company operates in a single operating segment. The Company’s chief operating decision maker is its chief executive officer, who reviews financial information presented on a consolidated basis for purposes of making operating decisions, assessing financial performance and allocating resources.
Revenue Recognition, Cost of Revenue and Deferred Revenue	Costs of revenue primarily consist of costs related to providing the Company’s cloud-based platform to its customers, including third-party hosting fees, amortization of capitalized internal-use software and finite-lived purchased developed technology, customer support, other employee-related expenses for security, technical operations and professional services staff, and allocated overhead costs. The Company derives revenue from subscription fees (which include support fees) and professional services fees. The Company sells subscriptions to its platform through arrangements that are generally one to five years in length. The Company’s arrangements are generally noncancelable and nonrefundable. Furthermore, if a customer reduces the contracted usage or service level, the customer has no right of refund. The Company’s subscription arrangements do not provide customers with the right to take possession of the software supporting the platform and, as a result, are accounted for as service arrangements. This revenue recognition policy is consistent for sales generated directly with customers and sales generated indirectly through channel partners. The Company determines revenue recognition through the following steps: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, the Company satisfies a performance obligation. Subscription Revenue Subscription revenue, which includes support, is recognized on a straight-line basis over the noncancelable contractual term of the arrangement, generally beginning on the date that the Company’s service is made available to the customer. Professional Services Revenue The Company’s professional services principally consist of customer-specific requests for application integrations, user interface enhancements and other customer-specific requests. Revenue for the Company’s professional services is recognized as services are performed in proportion to their pattern of transfer. Contracts with Multiple Performance Obligations Some of the Company’s contracts with customers contain multiple performance obligations. For these contracts, the Company accounts for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative SSP basis. The Company determines SSP based on observable, if available, prices for those related services when sold separately. When such observable prices are not available, the Company determines SSP based on overarching pricing objectives and strategies, taking into consideration market conditions and other factors, including customer size, volume purchased, market and industry conditions, product-specific factors and historical sales of the deliverables. 30
Deferred Commissions	Sales commissions earned by the Company’s sales force are considered incremental and recoverable costs of obtaining a contract with a customer. Sales commissions for new revenue contracts, including incremental sales to existing customers, are deferred and then amortized on a straight-line basis over a period of benefit, which the Company has determined to be generally five years. The Company determined the period of benefit by taking into consideration its customer contracts, its technology and other factors. Sales commissions for renewal contracts (which are not considered commensurate with sales commissions for new revenue contracts and incremental sales to existing customers) are deferred and then amortized on a straight-line basis over the related period of benefit, which is generally the related contract renewal term. Amortization expense is included in sales and marketing expenses in the accompanying consolidated statements of operations.
Cash and Cash Equivalents	Cash and cash equivalents consist of cash on hand and highly liquid investments with original maturities of three months or less from the date of purchase. Cash equivalents generally consist of investments in money market funds. The fair market value of cash equivalents approximated their carrying value as of January 31, 2020 and 2019
Short-term Investments	The Company’s short-term investments comprise asset-backed securities, U.S. treasury securities and corporate debt securities. The Company determines the appropriate classification of its short-term investments at the time of purchase and reevaluates such designation at each balance sheet date. The Company has classified and accounted for its short-term investments as available-for-sale securities as the Company may sell these securities at any time for use in its current operations or for other purposes, even prior to maturity. As a result, the Company classifies its short-term investments, including securities with stated maturities beyond twelve months, within current assets in the consolidated balance sheets.
Accounts Receivable and Allowances	Accounts receivable are recorded at the invoiced amount, net of allowances. These allowances are based on the Company’s assessment of the collectibility of accounts by considering the age of each outstanding invoice, the collection history of each customer and an evaluation of potential risk of loss associated with delinquent accounts. Amounts deemed uncollectible are recorded to these allowances in the consolidated balance sheets with an offsetting decrease in related deferred revenue and a charge to general and administrative expense in the consolidated statement of operations.
Property and Equipment	Property and equipment, net, is stated at cost less accumulated depreciation. Depreciation is recorded using the straight-line method over the estimated useful lives of the respective assets. Repairs and maintenance costs are expensed as incurred. The useful lives of property and equipment are as follows: Useful lives Capitalized internal-use software costs 3 years Computers and equipment 3 years Furniture and fixtures 7 years Leasehold improvements Shorter of estimated useful life or remaining lease term
Business Combinations	When the Company acquires a business, the purchase price is allocated to the net tangible and identifiable intangible assets acquired. Any residual purchase price is recorded as goodwill. The allocation of the purchase price requires management to make estimates in determining the fair values of assets acquired and liabilities assumed, especially with respect to intangible assets. These estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, the appropriate weighted-average cost of capital and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable. During the measurement period, which may be up to one year from the acquisition date, adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed may be recorded, with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the consolidated statements of operations.
Goodwill and Other Long-Lived Assets	The excess of the purchase price over the estimated fair value of net assets of businesses acquired in a business combination is recognized as goodwill. Goodwill is tested for impairment annually on November 1 st or more frequently if certain indicators are present. Long-lived assets, such as property and equipment and finite-lived intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of any asset may not be recoverable. Recoverability of assets to be held and used is measured by comparing the carrying amount to the estimated undiscounted future cash flows expected to be generated. If the carrying amount exceeds the undiscounted cash flows, the assets are determined to be impaired and an impairment charge is recognized as the amount by which the carrying amount exceeds its fair value.
Convertible Senior Notes	In February 2018 , the Company issued $345.0 million aggregate principal amount of 0.25% convertible senior notes due February 15, 2023 in a private offering (2023 Notes). In September 2019 , the Company issued $1,060.0 million aggregate principal amount of 0.125% convertible senior notes due September 1, 2025 (2025 Notes, the 2025 Notes together with the 2023 Notes, the Notes). Concurrent with the issuance of the 2025 Notes, the Company used part of the net proceeds to repurchase a portion of the 2023 Notes (2023 Notes Partial Repurchase). See Note 9 for additional details. The Notes are accounted for in accordance with FASB ASC Subtopic 470-20, Debt with Conversion and Other Options. Pursuant to ASC Subtopic 470-20, issuers of certain convertible debt instruments, such as the Notes, that have a net settlement feature and may be settled wholly or partially in cash upon conversion are required to separately account for the liability (debt) and equity (conversion option) components of the instrument. The carrying amount of the liability component of the instrument is computed by estimating the fair value of a similar liability without the conversion option using income and market based approaches. For the income-based approach, the Company uses a convertible bond pricing model that includes several assumptions such as volatility and the risk-free rate. For the market-based approach, the Company observes the price of derivative price instruments purchased in conjunction with our convertible senior note issuances or evaluates issuances of convertible debt securities by other companies with similar credit risk ratings at the time of issuance. The amount of the equity component is then calculated by deducting the fair value of the liability component from the principal amount of the instrument. The difference between the principal amount and the liability component represents a debt discount that is amortized to interest expense over the respective terms of the Notes using an effective interest rate method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the issuance costs related to the Notes, the allocation of issuance costs incurred between the liability and equity components were based on their relative values. Similarly, in accordance with ASC Subtopic 470-20, transactions involving contemporaneous exchanges of cash between the same debtor and creditor in connection with the issuance of a new debt obligation and satisfaction of an existing debt obligation by the debtor, such as the contemporaneous 2023 Notes Partial Repurchase and issuance of the 2025 Notes, should be evaluated as a modification or an exchange transaction depending on whether the exchange is determined to have substantially different terms. The 2023 Notes Partial Repurchase and issuance of the 2025 Notes were deemed to have substantially different terms due to the significant difference between the value of the conversion option immediately prior to and after the exchange, and consequently, the 2023 Notes Partial Repurchase was accounted for as a debt extinguishment. Pursuant to ASC Subtopic 470-20, total consideration for the 2023 Notes Partial Repurchase was separated into liability and equity components by estimating the fair value of a similar liability without a conversion option and assigning the residual value to the equity component. The effective interest rate used to estimate the fair value of the liability component of the 2023 Notes Partial Repurchase is based on the income and market based approaches used to determine the effective interest rate of the 2025 Notes, adjusted for the remaining tenor of the 2023 Notes. The gain or loss on extinguishment of the debt is subsequently determined by comparing repurchase consideration allocated to the liability component to the sum of the carrying value of the liability component, net of the proportionate amounts of unamortized debt discount and remaining unamortized debt issuance costs.
Advertising Expenses	Advertising costs are expensed as incurred.
Income Taxes	The Company accounts for income taxes in accordance with the liability method of accounting for income taxes. Under this method, the Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial reporting and tax basis of assets and liabilities, as well as for operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. The Company records a valuation allowance to reduce its deferred tax assets to the net amount that the Company believes is more likely than not to be realized. In assessing the need for a valuation allowance, the Company has considered its historical levels of income, expectations of future taxable income and ongoing tax planning strategies. Because of the uncertainty of the realization of the deferred tax assets, the Company has recorded a full valuation allowance against its deferred tax assets. Realization of its deferred tax assets is dependent primarily upon future U.S. taxable income. The Company recognizes and measures tax benefits from uncertain tax positions using a two-step approach. The first step is to evaluate the tax position taken or expected to be taken by determining if the weight of available evidence indicates that it is more likely than not that the tax position will be sustained in an audit, including resolution of any related appeals or litigation processes. The second step is to measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. Significant judgment is required to evaluate uncertain tax positions. Although the Company believes that it has adequately reserved for its uncertain tax positions, it can provide no assurance that the final tax outcome of these matters will not be materially different. The Company evaluates its uncertain tax position on a regular basis and evaluations are based on a number of factors, including changes in facts and circumstances, changes in tax law, correspondence with tax authorities during the course of an audit and effective settlement of audit issues.
Facility Leases	The Company leases office space under operating leases with expiration dates through 2028. The Company determines whether an arrangement constitutes a lease and records lease liabilities and right-of-use assets on its consolidated balance sheets at lease commencement. Lease liabilities are measured based on the present value of the total lease payments not yet paid discounted based on the more readily determinable of either the rate implicit in the lease or the Company’s incremental borrowing rate, which is the estimated rate the Company would be required to pay for a collateralized borrowing equal to the total lease payments over the term of the lease. Lease liabilities due within twelve months are included within accrued expenses and other current liabilities on the Company's consolidated balance sheet. The estimation of the incremental borrowing rate is based on an analysis of publicly traded debt securities of companies with similar credit and financial profiles. Right-of-use assets are measured based on the corresponding lease liability adjusted for (i) payments made to the lessor at or before the commencement date, (ii) initial direct costs incurred and (iii) tenant incentives received, incurred or payable under the lease. Recognition of rent expense begins when the lessor makes the underlying asset available to the Company. The Company does not assume renewals or early terminations of its leases unless it is reasonably certain to exercise these options at commencement and does not allocate consideration between lease and non-lease components. For short-term leases, the Company records rent expense in its condensed consolidated statements of operations on a straight-line basis over the lease term and records variable lease payments as incurred.
Concentrations of Risk and Significant Customers	Other than the United States, no individual country exceeded 10% of total revenue for the years ended January 31, 2020 , 2019 and 2018 . Property and equipment by geographic location is based on the location of the legal entity that owns the asset. As of January 31, 2020 and 2019 , substantially all of the Company’s property and equipment was located in the United States. The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments and accounts receivable. Cash and cash equivalents and short-term investments are currently held in three financial institutions and, at times, may exceed federally insured limits. As of January 31, 2020 and 2019 and for each of the three years ended January 31, 2020 , no single customer represented greater than 10% of accounts receivable or greater than 10% of revenue, respectively.
Net Loss per Share	The Company computes basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for participating securities. Under the two-class method, basic net loss per share
Recently Adopted and Not Yet Adopted Accounting Pronouncements	In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments, which changes the existing incurred loss impairment model for financial assets held at amortized cost. The new model uses a forward-looking expected loss method to calculate credit loss estimates. ASU 2016-13 also eliminates the concept of other-than-temporary impairment and requires credit losses related to available-for-sale debt securities to be recorded through an allowance for credit losses rather than as a reduction in the amortized cost basis of the securities. These changes will result in earlier recognition of credit losses. This guidance is effective for the Company on February 1, 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures and does not expect a material impact. In August 2018, the FASB issued ASU 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (ASU 2018-15), which requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance in Accounting Standards Codification 350-40 to determine which implementation costs to defer and recognize as an asset. This guidance is effective for the Company on February 1, 2020 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures and does not expect a material impact. In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes, which simplifies accounting for income taxes by revising or clarifying existing guidance in ASC 740, as well as removing certain exceptions within ASC 740. The guidance is effective for the Company on February 1, 2021 with early adoption permitted. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements and related disclosures.
Fair Value Measurement	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.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Schedule of Property Plant and Equipment Estimated Useful Life	The useful lives of property and equipment are as follows: Useful lives Capitalized internal-use software costs 3 years Computers and equipment 3 years Furniture and fixtures 7 years Leasehold improvements Shorter of estimated useful life or remaining lease term Property and equipment consisted of the following (in thousands): As of January 31, 2020 2019 Computers and equipment $ 3,567 $ 3,668 Furniture and fixtures 11,014 11,012 Leasehold improvements 55,363 47,883 Property and equipment, gross 69,944 62,563 Less accumulated depreciation (16,409 ) (9,642 ) Property and equipment, net $ 53,535 $ 52,921
Schedule of Revenue by Geographic Area	The following table sets forth revenue by geographic area (in thousands): Year Ended January 31, 2020 2019 2018 United States $ 494,529 $ 337,367 $ 217,300 International 91,538 61,887 39,247 Total $ 586,067 $ 399,254 $ 256,547
Schedule of Impact of New Accounting Pronouncements	Select consolidated balance sheet line items, which reflect the adoption of ASC 842, are as follows (in thousands): As of January 31, 2019 As Reported Adoption of ASC 842 As Adjusted Assets Current assets: Prepaid expenses and other current assets $ 29,451 $ (1,214 ) $ 28,237 Total current assets 709,330 (1,214 ) 708,116 Operating lease right-of-use assets — 121,389 121,389 Other noncurrent assets 15,286 (197 ) 15,089 Total assets $ 864,335 $ 119,978 $ 984,313 Liabilities and stockholders’ equity Current liabilities: Accrued expenses and other liabilities $ 24,740 $ 8,913 $ 33,653 Total current liabilities 564,191 8,913 573,104 Operating lease liabilities, noncurrent — 147,046 147,046 Other noncurrent liabilities 38,999 (35,981 ) 3,018 Total liabilities 611,958 119,978 731,936 Total liabilities and stockholders’ equity $ 864,335 $ 119,978 $ 984,313

Cash Equivalents and Short-te_2

Cash Equivalents and Short-term Investments (Tables)	12 Months Ended
	Jan. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Costs, Unrealized Gains and Losses and Estimated Fair Value of Cash Equivalents and Short-term Investments	The amortized cost, unrealized gain (loss) and estimated fair value of the Company’s cash equivalents and short-term investments as of January 31, 2020 and 2019 were as follows (in thousands): As of January 31, 2020 Amortized Cost Unrealized Gain Unrealized Loss Estimated Fair Value Cash equivalents: Money market funds $ 416,584 $ — $ — $ 416,584 U.S. treasury securities 19,996 — — 19,996 Total cash equivalents 436,580 — — 436,580 Short-term investments: U.S. treasury securities 575,920 686 (8 ) 576,598 Corporate debt securities 305,859 519 — 306,378 Total short-term investments 881,779 1,205 (8 ) 882,976 Total $ 1,318,359 $ 1,205 $ (8 ) $ 1,319,556 As of January 31, 2019 Amortized Cost Unrealized Gain Unrealized Loss Estimated Fair Value Cash equivalents: Money market funds $ 247,426 $ — $ — $ 247,426 Corporate debt securities 3,409 — (1 ) 3,408 Total cash equivalents 250,835 — (1 ) 250,834 Short-term investments: U.S. treasury securities 195,913 37 (53 ) 195,897 Corporate debt securities 69,483 13 (19 ) 69,477 Total short-term investments 265,396 50 (72 ) 265,374 Total $ 516,231 $ 50 $ (73 ) $ 516,208
Schedule of Contractual Maturities of Short-term Investments	The Company's short-term investments as of January 31, 2020 and 2019 all mature within one year, as follows (in thousands): As of January 31, 2020 As of January 31, 2019 Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due within one year $ 881,779 $ 882,976 $ 265,396 $ 265,374

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Jan. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following table presents information about the Company’s financial assets that were measured at fair value on a recurring basis using the above input categories (in thousands): As of January 31, 2020 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 416,584 $ — $ — $ 416,584 U.S. treasury securities $ — $ 19,996 $ — 19,996 Total cash equivalents 416,584 19,996 — 436,580 Short-term investments: U.S. treasury securities — 576,598 — 576,598 Corporate debt securities — 306,378 — 306,378 Total short-term investments — 882,976 — 882,976 Total cash equivalents and short-term investments $ 416,584 $ 902,972 $ — $ 1,319,556 As of January 31, 2019 Level 1 Level 2 Level 3 Total Assets: Cash equivalents: Money market funds $ 247,426 $ — $ — $ 247,426 Corporate debt securities — 3,408 — 3,408 Total cash equivalents 247,426 3,408 — 250,834 Short-term investments: U.S. treasury securities — 195,897 — $ 195,897 Corporate debt securities — 69,477 — 69,477 Total short-term investments — 265,374 — 265,374 Total cash equivalents and short-term investments $ 247,426 $ 268,782 $ — $ 516,208
Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note	The following table presents the carrying amounts and estimated fair values of our financial instruments that are not recorded at fair value on the consolidated balance sheets (in thousands): As of January 31, 2020 Net Carrying Amount (1) Estimated Fair Value 2023 Convertible senior notes $ 102,543 $ 331,014 2025 Convertible senior notes $ 851,535 $ 1,074,840

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, net (Tables)	12 Months Ended
	Jan. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill balances as of January 31, 2020 and 2019 were as follows (in thousands): Goodwill Balance at January 31, 2019 $ 18,089 Goodwill recorded in connection with Azuqua acquisition 29,934 Balance at January 31, 2020 $ 48,023
Schedule of Intangible Assets, net	Intangible assets consisted of the following (in thousands): As of January 31, 2020 Gross Accumulated Amortization Write-offs Net Capitalized internal-use software costs $ 24,890 $ (14,828 ) $ (119 ) $ 9,943 Purchased developed technology 28,800 (6,321 ) — 22,479 Software licenses 1,112 (1,005 ) — 107 $ 54,802 $ (22,154 ) $ (119 ) $ 32,529 As of January 31, 2019 Gross Accumulated Amortization Write-offs Net Capitalized internal-use software costs $ 19,838 $ (9,969 ) $ — $ 9,869 Purchased developed technology 4,600 (833 ) — 3,767 Software licenses 1,023 (762 ) — 261 $ 25,461 $ (11,564 ) $ — $ 13,897
Schedule of Estimated Remaining Amortization Expense for Intangible Assets	As of January 31, 2020 , estimated remaining amortization expense for the intangible assets by fiscal year was as follows (in thousands): Remaining Amortization 2021 11,300 2022 8,403 2023 6,586 2024 5,356 2025 884 Total $ 32,529

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Jan. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Property and Equipment, net	The useful lives of property and equipment are as follows: Useful lives Capitalized internal-use software costs 3 years Computers and equipment 3 years Furniture and fixtures 7 years Leasehold improvements Shorter of estimated useful life or remaining lease term Property and equipment consisted of the following (in thousands): As of January 31, 2020 2019 Computers and equipment $ 3,567 $ 3,668 Furniture and fixtures 11,014 11,012 Leasehold improvements 55,363 47,883 Property and equipment, gross 69,944 62,563 Less accumulated depreciation (16,409 ) (9,642 ) Property and equipment, net $ 53,535 $ 52,921
Schedule of Allowances	The Company’s accounts receivable allowances for the years ended January 31, 2020 , 2019 and 2018 were as follows (in thousands): As of January 31, 2020 2019 2018 Balance, beginning of period $ 2,098 $ 1,472 $ 1,306 (Reductions) additions (673 ) 888 431 Write-offs (259 ) (262 ) (265 ) Balance, end of period $ 1,166 $ 2,098 $ 1,472
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): As of January 31, 2020 2019 (1) Accrued expenses 22,530 21,174 Accrued taxes payable 1,591 1,195 Operating lease liabilities 12,064 10,914 Other 702 370 Accrued expenses and other current liabilities $ 36,887 $ 33,653
Schedule of Other Liabilities, noncurrent	Other liabilities, noncurrent consisted of the following (in thousands): As of January 31, 2020 2019 (1) Deferred tax liabilities $ 1,558 $ 727 Other 3,803 2,291 Other liabilities, noncurrent $ 5,361 $ 3,018

Convertible Senior Notes, Net (

Convertible Senior Notes, Net (Tables)	12 Months Ended
	Jan. 31, 2020
Debt Disclosure [Abstract]
Schedule of Interest Expense	The following table sets forth total interest expense recognized related to the 2025 Notes (in thousands): Year Ended January 31, 2020 Contractual interest expense $ 519 Amortization of debt issuance costs 769 Amortization of debt discount 12,919 Total $ 14,207 Year Ended January 31, 2020 2019 Contractual interest expense $ 606 $ 793 Amortization of debt issuance costs 985 1,085 Amortization of debt discount 11,219 13,194 Total $ 12,810 $ 15,072
Schedule of Liability and Equity Component of 2023 Notes	The 2023 Notes, net consisted of the following (in thousands): As of January 31, 2020 Liability component: Principal $ 120,588 Less: unamortized debt issuance costs and debt discount (19,885 ) Net carrying amount $ 100,703 Equity component: 2023 Notes $ 27,949 Less: issuance costs (811 ) Carrying amount of the equity component (1) $ 27,138 (1) Included in the consolidated balance sheets within Additional paid-in capital. The 2025 Notes, net consisted of the following (in thousands): As of January 31, 2020 Liability component: Principal $ 1,060,000 Less: unamortized debt issuance costs and debt discount (222,998 ) Net carrying amount $ 837,002 Equity component: 2025 Notes $ 221,387 Less: issuance costs (4,040 ) Carrying amount of the equity component (1) $ 217,347

Leases (Tables)

Leases (Tables)	12 Months Ended
	Jan. 31, 2020
Leases [Abstract]
Schedule of Operating Lease Costs	Operating lease costs were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Operating lease costs (1) $ 23,193 $ 23,290 $ 10,588 (1) Amounts are presented exclusive of sublease income and include short-term leases, which are immaterial.
Schedule of Maturities of Operating Leases	Maturities of the Company’s operating lease liabilities, which do not include short-term leases, as of January 31, 2020 were as follows (in thousands): Operating Leases 2021 $ 21,225 2022 27,512 2023 27,532 2024 28,110 2025 25,768 Thereafter 81,209 Total lease payments 211,356 Less imputed interest (44,781 ) Total operating lease liabilities $ 166,575

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Jan. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	As of January 31, 2020 , future minimum purchase obligations, such as data center operations and sales and marketing activities, were as follows (in thousands): Purchase Obligations 2021 $ 56,413 2022 39,110 2023 30,398 2024 30,000 Total contractual obligations $ 155,921
Schedule of Purchase Obligations Fiscal Maturity Schedule	As of January 31, 2020 , future minimum purchase obligations, such as data center operations and sales and marketing activities, were as follows (in thousands): Purchase Obligations 2021 $ 56,413 2022 39,110 2023 30,398 2024 30,000 Total contractual obligations $ 155,921

Common Stock and Stockholders_2

Common Stock and Stockholders' Equity (Tables)	12 Months Ended
	Jan. 31, 2020
Equity [Abstract]
Schedule of Common Stock Reserved for Future Issuance	As of January 31, 2020 , shares of common stock reserved for future issuance were as follows: As of January 31, 2020 Options and unvested RSUs outstanding 17,252,543 Available for future stock option and RSU grants 16,456,003 Available for ESPP 3,653,857 37,362,403

Employee Incentive Plans (Table

Employee Incentive Plans (Tables)	12 Months Ended
	Jan. 31, 2020
Share-based Payment Arrangement [Abstract]
Schedule of Stock-based Compensation Expense by Award Type	Stock-based compensation expense by award type was as follows (in thousands): Year Ended January 31, 2020 2019 2018 Stock options $ 21,888 $ 23,466 $ 24,186 RSUs 94,637 41,637 9,104 ESPP 9,408 7,248 7,111 Restricted stock awards 590 1,608 3,281 Restricted common stock 101 2,361 6,178 Total $ 126,624 $ 76,320 $ 49,860
Schedule of Stock-based Compensation Expense by Statement of Operations Location	Stock-based compensation expense was recorded in the following cost and expense categories in the Company’s consolidated statements of operations (in thousands): Year Ended January 31, 2020 2019 2018 Cost of revenue: Subscription $ 12,923 $ 7,837 $ 4,600 Professional services and other 7,164 4,983 3,137 Research and development 37,683 22,642 18,107 Sales and marketing 38,077 22,916 13,242 General and administrative 30,777 17,942 10,774 Total $ 126,624 $ 76,320 $ 49,860
Schedule of Stock Option Activity	A summary of the Company’s stock option activity and related information was as follows: Number of Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding as of January 31, 2019 17,803,794 $ 9.16 7.1 $ 1,304,446 Granted 415,547 82.33 Exercised (5,422,281 ) 8.37 Canceled (437,758 ) 13.35 Outstanding as of January 31, 2020 12,359,302 $ 11.82 6.2 $ 1,436,487 As of January 31, 2020: Vested and expected to vest 12,359,302 $ 11.82 6.2 $ 1,436,487 Vested and exercisable 8,723,638 $ 8.16 5.9 $ 1,045,852
Schedule of Black-Scholes Option Pricing Model Estimated Fair Value Assumptions	The Company used the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions: Year Ended January 31, 2020 2019 2018 Expected volatility 43 % 40 % 40% - 41% Expected term (in years) 6.3 6.3 6.3 - 6.4 Risk-free interest rate 1.55% - 2.27% 2.70 % 1.87% - 2.21% Expected dividend yield — — —
Schedule of Nonvested Restricted Stock Units Activity	A summary of the Company’s RSU activities and related information is as follows: Number of Weighted- Outstanding as of January 31, 2019 4,835,536 $ 44.49 Granted 2,458,095 114.07 Vested (1,752,333 ) 44.69 Forfeited (648,057 ) 54.94 Outstanding as of January 31, 2020 4,893,241 $ 77.99
Schedule of ESPP Black-Scholes Option Pricing Model Estimated Fair Value Assumptions	The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions: Year Ended January 31, 2020 2019 2018 Expected volatility 43% - 59% 39% - 70% 32% - 38% Expected term (in years) 0.5 - 1.0 0.5 - 1.0 0.5 - 1.2 Risk-free interest rate 1.53% - 2.05% 2.12% - 2.62% 0.95% - 1.73% Expected dividend yield — — —

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Domestic and Foreign Components of Pre-tax Loss	The domestic and foreign components of pre-tax loss for the years ended January 31, 2020 , 2019 and 2018 were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Domestic $ (220,846 ) $ (128,214 ) $ (112,858 ) Foreign 10,514 2,700 2,688 Loss before benefit from income taxes $ (210,332 ) $ (125,514 ) $ (110,170 )
Schedule of Components of Provision for (Benefit from) Income Taxes	The components of the benefit from income taxes for the years ended January 31, 2020 , 2019 and 2018 were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Current: Federal $ 33 $ — $ — State 86 61 — Foreign 822 667 183 Total current provision for income taxes 941 728 183 Deferred: Federal (518 ) (620 ) (32 ) State (406 ) (130 ) 10 Foreign (1,436 ) 5 (482 ) Total deferred benefit from income taxes (2,360 ) (745 ) (504 ) Total benefit from income taxes $ (1,419 ) $ (17 ) $ (321 )
Schedule of Effective Income Tax Rate Reconciliation	The following is a reconciliation of the statutory federal income tax rate to the Company’s effective tax rate for the years ended January 31, 2020 , 2019 and 2018 : Year Ended January 31, 2020 2019 2018 Tax at federal statutory rate 21.0 % 21.0 % 33.8 % State income taxes, net of federal benefit 4.0 3.8 3.4 Change in valuation allowance (100.1 ) (68.5 ) (27.1 ) Stock-based compensation 59.8 45.5 42.4 Research and development credits 18.0 — — Tax Cuts and Jobs Act of 2017 — — (51.3 ) Other, net (2.0 ) (1.8 ) (0.9 ) Effective tax rate 0.7 % — % 0.3 %
Schedule of Deferred Tax Assets and Liabilities	The tax effects of temporary differences and related deferred tax assets and liabilities as of January 31, 2020 and 2019 were as follows (in thousands): As of January 31, 2020 2019 As Adjusted (1) Deferred tax assets: Net operating loss carryforwards $ 370,705 $ 202,471 Stock-based compensation 18,680 13,185 Deferred revenue 1,960 1,312 Operating lease liabilities 42,073 39,060 Other reserves and accruals 6,414 3,750 Research and development and other credits 39,918 791 Convertible debt — 477 Disallowed interest 4,507 1,292 Total deferred tax assets 484,257 262,338 Valuation allowance (361,606 ) (203,899 ) Total deferred tax assets, net 122,651 58,439 Deferred tax liabilities: Convertible debt (50,963 ) — Deferred commissions (27,569 ) (19,424 ) Capitalized internal-use software costs (2,248 ) (2,047 ) Goodwill (262 ) (217 ) Operating lease right-of-use assets (31,165 ) (29,697 ) Depreciation and amortization (8,315 ) (6,492 ) Total deferred tax liabilities (120,522 ) (57,877 ) Net deferred tax assets $ 2,129 $ 562 (1) Adjusted for adoption of ASC 842. See Note 2.
Schedule of Unrecognized Tax Benefits Roll Forward	A reconciliation of beginning and ending amount of unrecognized tax benefit was as follows (in thousands): Year Ended January 31, 2020 2019 2018 Gross amount of unrecognized tax benefits as of the beginning of the year $ 23,931 $ 11,719 $ 5,775 Additions based on tax positions related to a prior year 658 1,859 — Additions based on tax positions related to current year 6,866 10,353 5,944 Reductions based on tax positions related to current year — — — Reductions based on tax positions taken in a prior year (15,468 ) — — Gross amount of unrecognized tax benefits as of the end of the year $ 15,987 $ 23,931 $ 11,719

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	12 Months Ended
	Jan. 31, 2020
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share (in thousands, except per share data): Year Ended January 31, 2020 2019 2018 Class A Class B Class A Class B Class A Class B Numerator: Net loss $ (192,138 ) $ (16,775 ) $ (107,926 ) $ (17,571 ) $ (31,980 ) $ (77,869 ) Denominator: Weighted-average shares outstanding, basic and diluted 107,809 9,412 92,452 15,052 24,165 58,839 Net loss per share, basic and diluted $ (1.78 ) $ (1.78 ) $ (1.17 ) $ (1.17 ) $ (1.32 ) $ (1.32 )
Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Per Share	Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): Year Ended January 31, 2020 2019 2018 Issued and outstanding stock options 12,359 17,804 24,917 Unvested RSUs issued and outstanding 4,893 4,836 2,863 Unvested restricted stock awards issued and outstanding 177 388 599 Unvested shares subject to repurchase 5 48 188 Unvested restricted common stock issued and outstanding — 400 800 Shares committed under the ESPP 253 271 1,149 Shares related to 2023 convertible senior notes 2,494 7,134 — Shares subject to warrants related to the issuance of 2023 convertible senior notes 2,494 — — Shares related to 2025 convertible senior notes 5,617 — — 28,292 30,881 30,516

Overview and Basis of Present_2

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

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Narrative (Details) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018	Sep. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Accrued Liabilities		$ 14,800,000
Share Price	$ 128.05
Payment terms for deferred revenue	30 days
Amortization period for capitalized contract costs	5 years
Commissions capitalized as contract costs	$ 61,300,000	41,300,000
Amortization of contract costs	28,600,000	20,900,000		$ 15,200,000
Impairment loss related to costs capitalized	0	0
Noncurrent portion of restricted cash	11,400,000
Advertising expenses	17,000,000	10,000,000		$ 9,400,000
Operating lease right-of-use assets	125,204,000	$ 121,389,000	[1]
Operating lease liability	$ 166,575,000
ESPP
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected dividend yield	0.00%	0.00%		0.00%
Capitalized internal-use software costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Intangible asset, useful life	3 years
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract duration	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract duration	5 years
Senior Notes | Convertible Senior Notes Due 2025
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Aggregate principal amount	$ 1,060,000,000
Fixed interest rate					0.125%
[1]	Adjusted for adoption of ASC 842. See Note 2.

Summary of Significant Accoun_5

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

Summary of Significant Accoun_6

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

Summary of Significant Accoun_7

Summary of Significant Accounting Policies Schedule of Impact of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Current assets:
Prepaid expenses and other current assets	$ 32,950	$ 28,237	[1]
Total current assets	1,599,725	708,116	[1]
Operating lease right-of-use assets	125,204	121,389	[1]
Other noncurrent assets	18,505	15,089	[1]
Total assets	1,955,395	984,313	[1]
Liabilities and stockholders’ equity
Accrued expenses and other liabilities	36,887	33,653	[1]
Total current liabilities	546,963	573,104	[1]
Operating lease liabilities, noncurrent	154,511	147,046	[1]
Other noncurrent liabilities	5,361	3,018	[1]
Total liabilities	1,550,051	731,936	[1]
Total liabilities and stockholders’ equity	$ 1,955,395	984,313	[1]
As Reported
Current assets:
Prepaid expenses and other current assets		29,451
Total current assets		709,330
Operating lease right-of-use assets		0
Other noncurrent assets		15,286
Total assets		864,335
Liabilities and stockholders’ equity
Accrued expenses and other liabilities		24,740
Total current liabilities		564,191
Operating lease liabilities, noncurrent		0
Other noncurrent liabilities		38,999
Total liabilities		611,958
Total liabilities and stockholders’ equity		864,335
Adoption of ASC 842
Current assets:
Prepaid expenses and other current assets		(1,214)
Total current assets		(1,214)
Operating lease right-of-use assets		121,389
Other noncurrent assets		(197)
Total assets		119,978
Liabilities and stockholders’ equity
Accrued expenses and other liabilities		8,913
Total current liabilities		8,913
Operating lease liabilities, noncurrent		147,046
Other noncurrent liabilities		(35,981)
Total liabilities		119,978
Total liabilities and stockholders’ equity		$ 119,978
[1]	Adjusted for adoption of ASC 842. See Note 2.

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($) $ in Thousands	Mar. 18, 2019	Jul. 13, 2018	Apr. 30, 2019	Jul. 31, 2018	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018	[1]
Business Acquisition [Line Items]
Payments for business acquisition, net of cash acquired					$ 44,283	$ 15,632	[1]	$ 0
Purchased developed technology					24,200
Goodwill					48,023	$ 18,089	[2]
Azuqua, Inc.
Business Acquisition [Line Items]
Payments for business acquisition, net of cash acquired	$ 44,200
Cash received from acquisition	1,100
Purchased developed technology					15,700
Goodwill	29,900
Acquisition related costs			$ 3,000
Azuqua, Inc. | Purchased developed technology
Business Acquisition [Line Items]
Purchased developed technology	$ 15,700
ScaleFT, Inc.
Business Acquisition [Line Items]
Payments for business acquisition, net of cash acquired		$ 15,600
Cash received from acquisition		600
Goodwill		11,800
Acquisition related costs				$ 1,100
ScaleFT, Inc. | Purchased developed technology
Business Acquisition [Line Items]
Purchased developed technology		$ 4,600
ScaleFT, Inc And Azuqua, Inc. [Member]
Business Acquisition [Line Items]
Deferred compensation liability, noncurrent					10,800
Compensation expense					4,400
Remaining deferred compensation balance					$ 4,800
Future weighted-average period					1 year 7 months 6 days
[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

Cash Equivalents and Short-te_3

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

Cash Equivalents and Short-te_4

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

Cash Equivalents and Short-te_5

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

Fair Value Measurements Schedul

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

Fair Value Measurements Sched_2

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

Fair Value Measurements Narrati

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

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, net Narrative (Details) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018		Mar. 18, 2019
Goodwill [Line Items]
Goodwill	$ 48,023,000	$ 18,089,000	[1]
Goodwill impairments	0	0		$ 0
Stock-based compensation included in capitalized software costs	1,200,000	500,000
Amortization expense	10,600,000	5,800,000		2,900,000
Company wrote-off an immaterial amount	119,000	$ 0	[2]	1,114,000	[2]
Purchased developed technology	$ 24,200,000
Weighted average useful life	3 years 10 months 24 days	2 years 6 months
Capitalized internal-use software costs
Goodwill [Line Items]
Capitalized internal-use software	$ 5,100,000	$ 3,400,000
Amortization expense	4,900,000	4,800,000		$ 2,700,000
Company wrote-off an immaterial amount	119,000	0
Purchased developed technology
Goodwill [Line Items]
Company wrote-off an immaterial amount	0	$ 0
Finite-lived Intangible Assets Acquired	8,500,000
Azuqua, Inc.
Goodwill [Line Items]
Goodwill						$ 29,900,000
Goodwill recorded in connection with Azuqua acquisition	29,934,000
Purchased developed technology	$ 15,700,000
Azuqua, Inc. | Purchased developed technology
Goodwill [Line Items]
Purchased developed technology						$ 15,700,000
[1]	Adjusted for adoption of ASC 842. See Note 2.
[2]	Adjusted for adoption of ASC 842. See Note 2.

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, net Schedule of Goodwill (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2020USD ($)
Goodwill [Roll Forward]
Balance at January 31, 2019	$ 18,089	[1]
Balance at January 31, 2020	$ 48,023
[1]	Adjusted for adoption of ASC 842. See Note 2.

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, net Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018	[1]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 54,802	$ 25,461
Accumulated Amortization	(22,154)	(11,564)
Write-offs	(119)	0	[1]	$ (1,114)
Net	32,529	13,897
Capitalized internal-use software costs
Finite-Lived Intangible Assets [Line Items]
Gross	24,890	19,838
Accumulated Amortization	(14,828)	(9,969)
Write-offs	(119)	0
Net	9,943	9,869
Purchased developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	28,800	4,600
Accumulated Amortization	(6,321)	(833)
Write-offs	0	0
Net	22,479	3,767
Software licenses
Finite-Lived Intangible Assets [Line Items]
Gross	1,112	1,023
Accumulated Amortization	(1,005)	(762)
Write-offs	0	0
Net	$ 107	$ 261
[1]	Adjusted for adoption of ASC 842. See Note 2.

Goodwill and Intangible Asset_6

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

Balance Sheet Components Schedu

Balance Sheet Components Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 69,944	$ 62,563
Less accumulated depreciation	(16,409)	(9,642)
Property and equipment, net	53,535	52,921	[1]
Depreciation expense	8,800	5,700		$ 4,000
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,567	3,668
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,014	11,012
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 55,363	$ 47,883
[1]	Adjusted for adoption of ASC 842. See Note 2.

Balance Sheet Components Sche_2

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

Balance Sheet Components Sche_3

Balance Sheet Components Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued expenses	$ 22,530	$ 21,174
Accrued taxes payable	1,591	1,195
Operating lease liabilities	12,064	10,914
Other	702	370
Accrued expenses and other current liabilities	$ 36,887	$ 33,653	[1]
[1]	Adjusted for adoption of ASC 842. See Note 2.

Balance Sheet Components Sche_4

Balance Sheet Components Schedule of Other Liabilities, Noncurrent (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred tax liabilities	$ 1,558	$ 727
Other	3,803	2,291
Other liabilities, noncurrent	$ 5,361	$ 3,018	[1]
[1]	Adjusted for adoption of ASC 842. See Note 2.

Deferred Revenue and Performa_2

Deferred Revenue and Performance Obligations Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue recognized that was included in the contract liability balance	$ 241.1	$ 157.9
Unbilled receivables	$ 1	$ 1.5

Deferred Revenue and Performa_3

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

Convertible Senior Notes, Net -

Convertible Senior Notes, Net - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands, shares in Millions	Feb. 23, 2018day	Sep. 30, 2019USD ($)shares	Feb. 28, 2018USD ($)day$ / shares	Jan. 31, 2020USD ($)day$ / shares	Jan. 31, 2020USD ($)day$ / shares	Jan. 31, 2019USD ($)	[1]	Jan. 31, 2018USD ($)	[1]	Oct. 31, 2019USD ($)	Sep. 01, 2019
Debt Instrument [Line Items]
Limitation on sale of common stock, sale price threshold, number of trading days | day					80
Gain (Loss) on extinguishment of debt					$ (14,572)	$ 0		$ 0
Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Fixed interest rate			0.25%
Net proceeds from notes			$ 335,000
Repayments of Long-term Debt		$ 224,400
Initial conversion rate of common stock	0.0206795		20.6795
Debt issuance costs		$ 3,800	$ 10,000
Principal remains outstanding				$ 120,588	$ 120,588					$ 345,000
Conversion price (in dollars per share) | $ / shares			$ 48.36
Limitation on sale of common stock, sale price threshold, number of trading days | day	20				20
Limitation on sale of common stock, sale price threshold, trading period | day	30				30
Threshold percentage of stock price trigger	130.00%				130.00%
Number of consecutive business days	5 days
Percentage of closing sale price in excess of convertible notes	98.00%
Redemption price percentage	100.00%		100.00%
Effective interest rate		4.00%	5.68%
Issuance costs attributable to liability component				7,700	$ 7,700
Debt Instrument, Repurchase Amount		$ 604,800
Debt Instrument, Repurchase Amount, Portion Allocated to to Debt Component		197,700
Debt Instrument, Repurchase Amount. Portion Allocated to Equity Component		407,100
Aggregate principal amount		183,100
Gain (Loss) on extinguishment of debt		$ (14,600)
Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Fixed interest rate											0.125%
Initial conversion rate of common stock					5.2991
Debt issuance costs				19,300	$ 19,300
Principal remains outstanding				$ 1,060,000	$ 1,060,000
Conversion price (in dollars per share) | $ / shares				$ 188.71	$ 188.71
Limitation on sale of common stock, sale price threshold, trading period | day			30	30
Percentage of closing sale price in excess of convertible notes				98.00%
Redemption price percentage		130.00%	100.00%
Effective interest rate			4.10%
Issuance costs attributable to liability component				$ 15,300	$ 15,300
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Less: issuance costs				811	811
Debt Issuance Costs, Equity Component, Gross				2,300	2,300
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Less: issuance costs				$ 4,040	$ 4,040
Class A Common Stock | Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Stock issued during the period (in shares) | shares		3
[1]	Adjusted for adoption of ASC 842. See Note 2.

Convertible Senior Notes, Net_2

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

Convertible Senior Notes, Net_3

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

Convertible Senior Notes, Net_4

Convertible Senior Notes, Net - Note Hedges and Warrants (Details) $ / shares in Units, shares in Thousands, $ in Thousands	Feb. 23, 2018dayshares	Sep. 30, 2019USD ($)shares	Feb. 28, 2018USD ($)day$ / sharesshares	Jan. 31, 2020USD ($)day$ / sharesshares	Jan. 31, 2020USD ($)day$ / sharesshares	Jan. 31, 2019USD ($)shares		Jan. 31, 2018USD ($)shares		Sep. 01, 2019
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares					28,292	30,881		30,516
Proceeds from Termination of Note Hedges					$ 405,851
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares	7,100
Proceeds from issuance of warrants related to 2023 convertible senior notes					0	$ 52,440	[1]	$ 0	[1]
Payments for Repurchase of Warrants					358,622	0	[1]	0	[1]
Payment for Capped Call, Convertible Debt					$ 74,094	$ 0	[1]	$ 0	[1]
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Shares issuable under warrants granted (in shares) | shares		4,600
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares				2,500	2,500
Per share value, shares issuable under warrants granted (in dollars per share) | $ / shares			$ 68.06
Proceeds from issuance of warrants related to 2023 convertible senior notes			$ 52,400
Payments for Repurchase of Warrants		$ 358,600
Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Initial Cap Price per Share, Capped Calls | $ / shares					$ 255.88
Payment for Capped Call, Convertible Debt					$ 74,100
Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Debt issuance costs, gross		$ 3,800	$ 10,000
Shares issuable under warrants granted (in shares) | shares		4,600	7,100
Proceeds from Termination of Note Hedges		$ 405,900
Conversion price (in dollars per share) | $ / shares			$ 48.36
Aggregate amount paid for cost of Note Hedge			$ 80,000
Number of warrants issued, subject to anti-dilution adjustments (in shares) | shares				2,500	2,500
Debt Instrument, interest rate, stated percentage			0.25%
Debt instrument, interest rate, effective percentage		4.00%	5.68%
Unamortized debt issuance expense				$ 7,700	$ 7,700
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day	30				30
Debt Instrument, Redemption Price, Percentage	100.00%		100.00%
Percentage of closing sale price in excess of convertible notes	98.00%
Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt issuance costs, gross				$ 19,300	$ 19,300
Conversion price (in dollars per share) | $ / shares				$ 188.71	$ 188.71
Debt Instrument, interest rate, stated percentage										0.125%
Proceeds from Issuance of Debt		$ 1,040,700
Debt instrument, interest rate, effective percentage			4.10%
Unamortized debt issuance expense				$ 15,300	$ 15,300
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day			30	30
Debt Instrument, Redemption Price, Percentage		130.00%	100.00%
Percentage of closing sale price in excess of convertible notes				98.00%
Debt Instrument, Redemption, Sales Price as a Percentage of Conversion Price		130.00%
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Debt instrument, convertible, equity component, unamortized discount issuance costs				$ 811	811
Additional Paid-in Capital | Senior Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt instrument, convertible, equity component, unamortized discount issuance costs				$ 4,040	$ 4,040
Convertible Debt Securities [Member]
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares					2,494	7,134		0
Convertible Debt Securities [Member] | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares					5,600
[1]	Adjusted for adoption of ASC 842. See Note 2.

Leases Narrative (Details)

Leases Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Other Commitments [Line Items]
Sublease income	$ 3.2	$ 0	$ 0
Weighted average remaining lease term	7 years 10 months 24 days	8 years 10 months 24 days
Weighted average discount rate	5.70%	5.80%
Operating lease payments	$ 18.3	$ 12.9
Lease not yet commenced, undiscounted amount	$ 56.9
Minimum
Other Commitments [Line Items]
Lease not yet commenced, term of contract	1 year 3 months 18 days
Maximum
Other Commitments [Line Items]
Lease not yet commenced, term of contract	8 years 8 months 12 days
San Francisco - Ten Year Lease
Other Commitments [Line Items]
Operating lease term	10 years
Operating lease renewal term	5 years

Leases Schedule of Operating Le

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

Leases Schedule of Maturities o

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

Commitments and Contingencies -

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

Commitments and Contingencies_2

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

Common Stock and Stockholders_3

Common Stock and Stockholders' Equity - Narrative (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2020USD ($)voteshares	Jan. 31, 2019USD ($)shares		Jan. 31, 2018USD ($)shares
Class of Stock [Line Items]
Non-cash charitable contributions	$ 1,746	$ 1,008	[1]	$ 708	[1]
Class A Common Stock
Class of Stock [Line Items]
Number of votes per share | vote	1
Class A Common Stock | Contribution of Nonmonetary Assets to Charitable Organization
Class of Stock [Line Items]
Issuance of common stock pursuant to charitable donation (in shares) | shares	15,000	20,000
Non-cash charitable contributions	$ 1,700	$ 1,000
Class B Common Stock
Class of Stock [Line Items]
Number of votes per share | vote	10
Class B Common Stock | Contribution of Nonmonetary Assets to Charitable Organization
Class of Stock [Line Items]
Issuance of common stock pursuant to charitable donation (in shares) | shares				24,287
Non-cash charitable contributions				$ 700
[1]	Adjusted for adoption of ASC 842. See Note 2.

Common Stock and Stockholders_4

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

Employee Incentive Plans Schedu

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

Employee Incentive Plans Sche_2

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

Employee Incentive Plans Narrat

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

Employee Incentive Plans Sche_3

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

Employee Incentive Plans Sche_4

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

Employee Incentive Plans Sche_5

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

Income Taxes - Schedule of Dome

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

Income Taxes - Schedule of Comp

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

Income Taxes - Narrative (Detai

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

Income Taxes - Reconciliation o

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

Income Taxes - Schedule of Defe

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

Income Taxes - Unrecognized Tax

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

Net Loss Per Share Schedule of

Net Loss Per Share Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019		Jan. 31, 2018
Numerator:
Net loss	$ (208,913)	$ (125,497)	[1]	$ (109,849)	[1]
Denominator:
Weighted-average shares outstanding, basic and diluted (in shares)	117,221	107,504		83,004
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.78)	$ (1.17)		$ (1.32)
Class A Common Stock
Denominator:
Weighted-average shares outstanding, basic and diluted (in shares)	107,809	92,452		24,165
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.78)	$ (1.17)		$ (1.32)
Class B Common Stock
Denominator:
Weighted-average shares outstanding, basic and diluted (in shares)	9,412	15,052		58,839
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (1.78)	$ (1.17)		$ (1.32)
Common Stock | Class A Common Stock
Numerator:
Net loss	$ (192,138)	$ (107,926)		$ (31,980)
Common Stock | Class B Common Stock
Numerator:
Net loss	$ (16,775)	$ (17,571)		$ (77,869)
[1]	Adjusted for adoption of ASC 842. See Note 2.

Net Loss Per Share Schedule o_2

Net Loss Per Share Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Per Share (Details) - shares shares in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	28,292	30,881	30,516
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)	12,359	17,804	24,917
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)	4,893	4,836	2,863
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)	177	388	599
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)	5	48	188
Unvested restricted common stock 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	400	800
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)	253	271	1,149
Shares related to 2023 convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,494	7,134	0
Shares subject to warrants related to the issuance of 2023 convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,494	0	0
Shares related to 2025 convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	5,617	0	0

Net Loss Per Share Narrative (D

Net Loss Per Share Narrative (Details) - $ / shares	Jan. 31, 2020	Feb. 28, 2018
Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Class of warrant or right, exercise price of warrants or rights		$ 68.06
Convertible Senior Notes Due 2023 | Senior Notes
Debt Instrument [Line Items]
Conversion price (in dollars per share)		$ 48.36
Convertible Senior Notes Due 2025 | Senior Notes
Debt Instrument [Line Items]
Conversion price (in dollars per share)	$ 188.71

Uncategorized Items - okta-1312

Label	Element	Value
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	$ 0	[1]
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	467,000
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	1,384,000	[1]
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	8,284,000	[1]
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	11,438,000
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	11,437,000	[1]
Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Accounting Standards Update 2016-09 [Member] | Additional Paid-in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	200,000
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (200,000)
[1]	Adjusted for adoption of ASC 842. See Note 2.