Zoom Video Communications (ZM) 10-K 20 Mar 20 2020 FY Annual report Financial data

Cover

Cover - USD ($) $ in Billions	12 Months Ended
	Jan. 31, 2020	Mar. 06, 2020	Jul. 31, 2019
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Amendment Flag	false
Document Period End Date	Jan. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	Zoom Video Communications, Inc.
Entity Central Index Key	0001585521
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,600,000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Class A Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		127,468,829
Class B Common Stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		151,532,787

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Current assets:
Cash and cash equivalents	$ 283,134	$ 63,624
Marketable securities	572,060	112,777
Accounts receivable, net of allowances of $7,634 and $2,071 as of January 31, 2020 and 2019, respectively	120,435	63,613
Deferred contract acquisition costs, current	44,885	26,453
Prepaid Expense and Other Assets, Current	75,008	10,252
Total current assets	1,095,522	276,719
Deferred contract acquisition costs, noncurrent	46,245	29,063
Property and equipment, net	57,138	37,275
Operating lease right-of-use assets	68,608
Other assets, noncurrent	22,332	11,508
Total assets	1,289,845	354,565
Current liabilities:
Accounts payable	1,596	4,963
Accrued expenses and other current liabilities	122,692	32,256
Deferred revenue, current	209,542	115,122
Total current liabilities	333,830	152,341
Deferred revenue, noncurrent	20,994	10,651
Operating lease liabilities, noncurrent	64,792
Other liabilities, noncurrent	36,286	39,460
Total liabilities	455,902	202,452
Commitments and contingencies (Note 8)
Convertible preferred stock, $0.001 par value per share, zero and 158,104,540 shares authorized as of January 31, 2020 and 2019, respectively; zero and 152,665,804 shares issued and outstanding as of January 31, 2020 and 2019, respectively	0	159,552
Stockholders’ equity (deficit):
Preferred stock, $0.001 par value per share, 200,000,000 and zero shares authorized as of January 31, 2020 and 2019, respectively; zero shares issued and outstanding as of January 31, 2020 and 2019	0	0
Common stock, $0.001 par value per share, 2,000,000,000 and 320,000,000 Class A shares authorized as of January 31, 2020 and 2019, respectively; 123,391,114 and zero shares issued and outstanding as of January 31, 2020 and 2019, respectively; 300,000,000 Class B shares authorized as of January 31, 2020 and 2019; 155,336,747 and 90,327,435 shares issued and outstanding as of January 31, 2020 and 2019, respectively	277	89
Additional paid-in capital	832,705	17,760
Accumulated other comprehensive income (loss)	809	(135)
Retained earnings (accumulated deficit)	152	(25,153)
Total stockholders’ equity (deficit)	833,943	(7,439)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 1,289,845	$ 354,565

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Accounts receivable, allowances	$ 7,634	$ 2,071
Convertible preferred stock par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares outstanding (in shares)	0	152,665,804
Convertible preferred stock, shares issued (in shares)	0	152,665,804
Convertible preferred stock, shares authorized (in shares)	0	158,104,540
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	200,000,000	0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000	320,000,000
Common stock, shares issued (in shares)	123,391,114	0
Common stock, shares outstanding (in shares)	123,391,114	0
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.001
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	155,336,747
Common stock, shares outstanding (in shares)	155,336,747	90,327,435

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Statement [Abstract]
Revenue	$ 622,658	$ 330,517	$ 151,478
Cost of revenue	115,396	61,001	30,780
Gross profit	507,262	269,516	120,698
Operating expenses:
Research and development	67,079	33,014	15,733
Sales and marketing	340,646	185,821	82,707
General and administrative	86,841	44,514	27,091
Total operating expenses	494,566	263,349	125,531
Income (loss) from operations	12,696	6,167	(4,833)
Interest income and other, net	13,666	2,182	1,315
Total	26,362	8,349	(3,518)
Provision for income taxes	1,057	765	304
Net income (loss)	25,305	7,584	(3,822)
Distributed earnings attributable to participating securities	0	0	(4,405)
Undistributed earnings attributable to participating securities	(3,555)	(7,584)	0
Net income (loss) attributable to common stockholders	$ 21,750	$ 0	$ (8,227)
Net income (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.09	$ 0	$ (0.11)
Diluted (in dollars per share)	$ 0.09	$ 0	$ (0.11)
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders:
Basic (in shares)	233,641,336	84,483,094	78,119,865
Diluted (in shares)	254,298,014	116,005,681	78,119,865

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 25,305	$ 7,584	$ (3,822)
Other comprehensive income (loss):
Unrealized gain (loss) on available-for-sale marketable securities, net of tax	944	396	(531)
Comprehensive income (loss)	$ 26,249	$ 7,980	$ (4,353)

CONSOLIDATED STATEMENTS OF CONV

CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	(Accumulated Deficit) Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding (in shares)		79,650,896
Beginning balance (in shares) at Jan. 31, 2017	154,031,604
Beginning balance at Jan. 31, 2017	$ 159,757
Increase (Decrease) in Temporary Equity [Roll Forward]
Repurchase of Series A convertible preferred stock (in shares)	(1,365,800)
Repurchase of Series A convertible preferred stock	$ (205)
Ending balance (in shares) at Jan. 31, 2018	152,665,804
Ending balance at Jan. 31, 2018	$ 159,552
Beginning balance at Jan. 31, 2017	(28,838)	$ 77	$ 0	$ 0	$ (28,915)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of Series A convertible preferred stock	(4,405)		(4,405)
Issuance of common stock upon exercise of stock options (in shares)		2,958,742
Issuance of common stock upon exercise of stock options	596	$ 3	593
Stock-based compensation expense	10,329		10,329
Other comprehensive income (loss)	(531)			(531)
Net income (loss)	(3,822)				(3,822)
Ending balance at Jan. 31, 2018	$ (26,671)	$ 80	6,517	(531)	(32,737)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding (in shares)		82,609,638
Ending balance (in shares) at Jan. 31, 2019	152,665,804
Ending balance at Jan. 31, 2019	$ 159,552
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		7,717,797
Issuance of common stock upon exercise of stock options	2,311	$ 9	2,302
Stock-based compensation expense	8,941		8,941
Other comprehensive income (loss)	396			396
Net income (loss)	7,584				7,584
Ending balance at Jan. 31, 2019	(7,439)	$ 89	17,760	(135)	(25,153)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding (in shares)		90,327,435
Conversion of convertible preferred stock to common stock upon initial public offering	$ (159,552)
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 (in shares)	19,003,652
Conversion of convertible preferred stock to common stock upon initial public offering (in shares)		152,665,804
Conversion of convertible preferred stock to common stock upon initial public offering	$ 159,552	$ 153	159,399
Conversion of convertible preferred stock to common stock upon initial public offering (in shares)		426,223
Conversion of convertible preferred stock to common stock upon initial public offering	15,344		15,344
Issuance of common stock upon initial public offering and private placement net of underwriting discounts and commissions and other offering costs (in shares)		15,819,646
Issuance of common stock upon initial public offering and private placement, net of underwriting discounts and commissions and other offering costs	541,499	$ 16	541,483
Issuance of common stock upon exercise of stock options, net of repurchases (in shares)		18,501,767
Issuance of common stock upon exercise of stock options, net of repurchases and release of restricted stock units	9,771	$ 19	9,752
Issuance of common stock reserved for charitable donation (in shares)		500,000
Issuance of common stock reserved for charitable donations	0
Proceeds from issuance of common stock fro employee stock purchase plan (in shares)		490,268
Issuance of common stock for employee stock purchase plan	15,482		15,482
Stock-based compensation expense	73,485		73,485
Other comprehensive income (loss)	944			944
Net income (loss)	25,305				25,305
Ending balance at Jan. 31, 2020	$ 833,943	$ 277	$ 832,705	$ 809	$ 152
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of convertible preferred stock to common stock upon initial public offering (in shares)	(152,665,804)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding (in shares)		278,731,143

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 25,305	$ 7,584	$ (3,822)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation expense	73,109	8,941	10,329
Amortization of deferred contract acquisition costs	37,101	20,839	9,023
Depreciation and amortization	16,449	7,008	2,786
Non-cash operating lease cost	6,885	0	0
Provision for accounts receivable allowances	6,370	1,953	727
Other	(1,068)	37	95
Changes in operating assets and liabilities:
Accounts receivable	(64,715)	(41,040)	(16,560)
Prepaid expenses and other assets	(24,805)	(7,971)	(3,443)
Deferred contract acquisition costs	(72,714)	(45,769)	(27,470)
Accounts payable	(2,030)	832	1,254
Accrued expenses and other liabilities	51,179	27,407	15,011
Deferred revenue	106,286	71,511	31,496
Operating lease liabilities, net	(5,460)	0	0
Net cash provided by operating activities	151,892	51,332	19,426
Cash flows from investing activities:
Purchases of marketable securities	(800,228)	(78,016)	(143,329)
Maturities of marketable securities	343,554	68,747	39,710
Purchases of property and equipment	(38,084)	(28,432)	(9,738)
Purchase of equity investment	(3,000)	0	0
Loans to employees	(1,569)	0	0
Purchases of intangible assets	(141)	(2,018)	0
Net cash used in investing activities	(499,468)	(39,719)	(113,357)
Cash flows from financing activities:
Proceeds from initial public offering and private placement, net of underwriting discounts and commissions and other offering costs	542,492	(939)	0
Proceeds from international employee stock sales to be remitted to employees and tax authorities	48,547	0	0
Proceeds from issuance of common stock for employee stock purchase plan	15,482	0	0
Proceeds from exercise of stock options, net of repurchases	9,169	3,565	733
Proceeds from issuance of convertible promissory notes and derivatives	0	15,000	0
Principal payments on capital lease obligations	0
Principal payments on capital lease obligations		(92)	(120)
Repurchase of convertible preferred stock	0	0	(4,610)
Net cash provided by (used in) financing activities	615,690	17,534	(3,997)
Net increase (decrease) in cash, cash equivalents, and restricted cash	268,114	29,147	(97,928)
Cash, cash equivalents, and restricted cash—beginning of period	65,968	36,821	134,749
Cash, cash equivalents, and restricted cash—end of period	334,082	65,968	36,821
Supplemental disclosures of cash flow information
Cash paid for income taxes	1,070	214	133
Supplemental disclosures of non-cash investing and financing information
Purchase of equipment during the period included in accounts payable and accrued expenses	1,422	3,284	392
Purchase of property and equipment under capital lease	0	0	212
Vesting of early exercised stock options and restricted stock awards	725	277	175
Deferred offering costs, accrued but not paid	0	1,490	0
Reconciliation of cash, cash equivalents, and restricted cash within the consolidated balance sheets to the amounts shown in the consolidated statements of cash flows above:
Cash and cash equivalents	283,134	63,624	36,146
Total cash, cash equivalents, and restricted cash	334,082	36,821	36,821
Class B Common Stock
Cash flows from operating activities:
Net income (loss)	19,855	7,584	(3,822)
Supplemental disclosures of non-cash investing and financing information
Conversion of convertible preferred stock to Class B common stock upon initial public offering	159,552	0	0
Class A Common Stock
Cash flows from operating activities:
Net income (loss)	5,450	0	0
Supplemental disclosures of non-cash investing and financing information
Conversion of debt to Class A common stock	$ 15,344	$ 0	$ 0

Summary of Business and Signifi

Summary of Business and Significant Accounting Policies	12 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Summary of Business and Significant Accounting Policies	Summary of Business and Significant Accounting Policies Description of Business Zoom Video Communications, Inc. and its subsidiaries (together, “Zoom,” the “Company,” “we,” “us,” or “our”) provide a video-first, unified communications platform. Our platform combines video, audio, phone, screen sharing, and chat functionalities. We were incorporated in the state of Delaware in April 2011 and are headquartered in San Jose, California. Fiscal Year Our fiscal year ends on January 31. References to fiscal year 2020, for example, refer to the fiscal year ended January 31, 2020. Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with GAAP and include the accounts of Zoom Video Communications, Inc., its subsidiaries, and a variable interest entity (“VIE”) for which we are the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation. Variable Interest Entities In the normal course of business, we may enter into relationships with entities that are deemed to be VIEs. A VIE is a legal entity that satisfies any of the following characteristics: (a) the legal entity does not have sufficient equity investment at risk; (b) the equity investors at risk, as a group, lack the characteristics of a controlling financial interest; or (c) the legal entity is structured with disproportionate voting rights, and substantially all of the activities are conducted on behalf of an investor with disproportionately few voting rights. We consolidate a VIE for which we are the primary beneficiary. The primary beneficiary of a VIE is the party, if any, with both of the following characteristics: (a) the power to direct the activities that most significantly affect the VIE’s economic performance (the “power criterion”) and (b) the obligation to absorb losses or the right to receive residual returns of the VIE that could potentially be significant to the VIE (the “economics criterion”). During fiscal year 2020, a VIE (the “China VIE”) was established and holds the license required to sell our products and services in the People’s Republic of China. However, we are the exclusive provider of technical and consulting services to the China VIE and own all copyrights, patents, technical secrets, trade secrets, and other intellectual properties related to and arising from the operations of the China VIE. Any creditors of the China VIE do not have recourse to our general credit. Through the China VIE agreements, we have the unilateral power to vote all of the shares of the China VIE, set its corporate policies and guidance, and designate the members of its board of directors and management team. We are also entitled to receive all dividends of the China VIE. Because both the power and economics criteria are met, we are the primary beneficiary of and therefore have a controlling financial interest in the China VIE. Initial Public Offering and Private Placement On April 23, 2019, we completed our IPO, in which we issued and sold 9,911,434 shares of our Class A common stock at $36.00 per share, resulting in net proceeds of $340.8 million after deducting underwriting discounts and commissions. On April 18, 2019, the underwriters exercised their option to purchase an additional 3,130,435 shares of our Class A common stock at $36.00 per share. This transaction closed on April 23, 2019, resulting in additional proceeds of $107.1 million, net of underwriters’ discounts and commissions. In connection with the IPO: • all of the shares of convertible preferred stock outstanding automatically converted into an aggregate of 152,665,804 shares of Class B common stock; • outstanding convertible promissory notes and accrued interest automatically converted into 426,223 shares of Class A common stock based on the IPO price of $36.00 per share; and • Salesforce Ventures LLC purchased 2,777,777 shares of Class A common stock from us at $36.00 per share in a concurrent private placement. We received aggregate proceeds of $100.0 million and did not pay any underwriting discounts or commissions with respect to the shares of Class A common stock that were sold in this private placement. Deferred offering costs consist primarily of accounting, legal, and other fees related to our IPO. Prior to the IPO, all deferred offering costs were capitalized in other assets, noncurrent in the consolidated balance sheets. After the IPO, $6.4 million of deferred offering costs were reclassified into stockholders’ equity (deficit) as a reduction of the IPO proceeds in the consolidated balance sheets. We capitalized $2.4 million of deferred offering costs within other assets, noncurrent in the consolidated balance sheet as of January 31, 2019, which were reclassified into additional paid-in capital upon the completion of the IPO. Stock Split In January 2018, our board of directors approved the amendment and restatement of our certificate of incorporation to effect a four-for-one forward stock split of our common stock and convertible preferred stock (collectively, the “Capital Stock”), which became effective on January 3, 2018. Accordingly, (i) each share of outstanding Capital Stock was split into four shares of Capital Stock of the same class and series, as applicable; (ii) the number of shares of Capital Stock issuable upon the exercise of each outstanding option to purchase Capital Stock was proportionately increased on a four-for-one basis; (iii) the exercise price of each outstanding option to purchase Capital Stock was proportionately reduced on a four-for-one basis; (iv) the authorized number of each class and series of Capital Stock was proportionally increased in accordance with the four-for-one stock split; and (v) the par value of each class of Capital Stock was not adjusted as result of this stock split. All of the share numbers, share prices, and exercise prices have been adjusted retroactively within these consolidated financial statements to reflect this stock split. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and 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. Significant items subject to such estimates and assumptions include, but are not limited to, the estimated expected benefit period for deferred contract acquisition costs, the accounts receivable allowances, the useful lives of long-lived assets, the incremental borrowing rate for operating leases, the valuation of derivative liabilities, the value of common stock and other assumptions used to measure stock-based compensation expense, sales and other tax liabilities, and the valuation of deferred income tax assets and uncertain tax positions. Actual results could differ from those estimates. Concentration of Risks Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, restricted cash, and accounts receivable. We maintain our cash, cash equivalents, marketable securities, and restricted cash with high-quality financial institutions with investment-grade ratings. A majority of the cash balances are with U.S. banks and are insured to the extent defined by the Federal Deposit Insurance Corporation. No single customer accounted for more than 10% of accounts receivable at January 31, 2020 or 2019. No single customer accounted for 10% or more of total revenue during the fiscal years ended January 31, 2020, 2019, or 2018. Cash, Cash Equivalents, and Restricted Cash Cash and cash equivalents consist of cash in banks and highly liquid investments, primarily money market funds, purchased with an original maturity of three months or less. Historically, restricted cash consisted of certificates of deposit collateralizing our operating leases and corporate credit cards, and was included in prepaid expenses and other current assets and other assets, noncurrent in the consolidated balance sheets. In the third quarter of fiscal year 2020, we received $48.5 million of cash from proceeds on international employees’ sales of our common stock. The amount is held in our bank account until it is remitted to the employees and the tax authorities. Due to the restrictions on the use of the funds in the bank account, we have classified the amount as restricted cash included in prepaid expenses and other current assets, and a corresponding amount is included in accrued expenses and other current liabilities in the consolidated balance sheets. Marketable Securities Marketable securities consist primarily of high-grade commercial paper, corporate bonds, agency bonds, corporate debt securities, U.S. government agency securities, and treasury bills. We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification at each balance sheet date. We may sell these securities at any time for use in current operations even if they have not yet reached maturity. As a result, we classify our securities, including those with maturities beyond 12 months, as current assets in the consolidated balance sheets. We carry these securities at fair value and record unrealized gains and losses in accumulated other comprehensive income (loss), which is reflected as a component of stockholders’ equity (deficit). We evaluate our securities to assess whether those with unrealized loss positions are other than temporarily impaired. We consider impairments to be other than temporary if they are related to deterioration in credit risk or if it is likely we will sell the securities before the recovery of their cost basis. Realized gains and losses from the sale of marketable securities and declines in value deemed to be other than temporary are determined based on the specific identification method. Realized gains and losses are reported in interest income and other, net in the consolidated statements of operations. Equity Investment In the third quarter of fiscal year 2020, we made a $3.0 million strategic investment in a private limited liability company in the business of designing and developing video communications hardware. We do not have a controlling financial interest in the investee nor the ability to exercise significant influence over the operating and financial policies of the investee. The investment is included within other assets, noncurrent in the consolidated balance sheets. Dividend income, unrealized and realized holding gains or losses, and impairment charges would be reported in interest income and other, net in the consolidated statements of operations. The maximum loss we could incur for this investment is its carrying value. We have elected to measure this investment, which does not have a readily determinable fair value, at its cost minus impairment, if any. If we identify observable price changes in orderly transactions for the identical or a similar investment of the same issuer, we will measure the equity security at fair value as of the date that the observable transaction occurred (i.e., using the measurement alternative). At each reporting period, we perform a qualitative assessment considering impairment indicators to evaluate whether the investment is impaired. If this qualitative assessment indicates that the investment is impaired and the fair value of the investment is less than its carrying amount, the investment would be written down to its fair value. As of January 31, 2020, the carrying amount of this investment is $3.0 million. We have not recognized any impairments nor any downward or upward measurement alternative adjustments to this carrying amount. Fair Value Measurements Fair value is defined as the exchange price that would be received from the sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure financial assets and liabilities at fair value at each reporting period using a fair value hierarchy, which requires us to maximize the use of observable inputs and minimize 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 fair value: Level 1—Quoted prices in active markets for identical assets or liabilities. Level 2—Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Financial instruments consist of cash equivalents, restricted cash, marketable securities, accounts receivable, accounts payable, convertible promissory notes, and derivative liabilities. Cash equivalents, restricted cash, marketable securities, and derivative liabilities are stated at fair value on a recurring basis. Accounts receivable and accounts payable are stated at their carrying value, which approximates fair value due to the short time to the expected receipt or payment date. The principal amounts of the convertible promissory notes approximate fair value as the stated interest rates approximate market rates currently available to us. Accounts Receivable Accounts receivable are recorded at the invoiced amount and amounts for which revenue has been recognized but not invoiced, net of accounts receivable allowances. The accounts receivable allowances are based on our assessment of the collectability of accounts. We regularly review the adequacy of the accounts receivable allowances based on a combination of factors. In establishing any required allowance, management considers historical losses adjusted to take into account current market conditions and our customers’ financial condition, the amount of any receivables in dispute, the current receivables aging, and the current payment terms. Accounts receivable deemed uncollectible are charged against the accounts receivable allowances when identified. Property and Equipment, Net Property and equipment, net, are stated at cost, less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the respective assets, determined to be three Software Development Costs We capitalize certain development costs related to our video-first communications platform during the application development stage. Costs incurred in the preliminary stages of development are analogous to research and development activities and are expensed as incurred. The preliminary stage includes activities such as conceptual formulation of alternatives, evaluation of alternatives, determination of existence of needed technology, and final selection of alternatives. Once the application development stage is reached, internal and external costs are capitalized until the software is substantially complete and ready for its intended use. Capitalized software development costs are recorded as part of property and equipment, net. Maintenance, minor upgrades, and training costs are expensed as incurred. Capitalized software development costs are amortized on a straight-line basis over the software’s estimated useful life, which is generally three years, and are recorded in cost of revenue in the consolidated statements of operations. We have capitalized $3.1 million, $2.5 million, and $0.8 million of software development costs during the fiscal years ended January 31, 2020, 2019, and 2018, respectively. Leases All lease arrangements are generally recognized at lease commencement. Operating lease right-of-use (“ROU”) assets and operating lease liabilities are recognized at commencement. For short-term leases (an initial term of 12 months or less), an ROU asset and corresponding lease liability are not recorded and we record rent expense in our consolidated statements of operations on a straight-line basis over the lease term and record variable lease payments as incurred. ROU assets represent our right to use an underlying asset during the reasonably certain lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of fixed payments not yet paid over the lease term. We use our incremental borrowing rate based on the information available at the commencement date in determining the lease liabilities as our leases generally do not provide an implicit rate. Our incremental borrowing rate is estimated to approximate the interest rate on a collateralized basis with similar terms and payments, in an economic environment where the leased asset is located. ROU assets also include any initial direct costs incurred and any lease payments made at or before the lease commencement date, less lease incentives received. We reassess the lease term if and when a significant event or change in circumstances occurs within our control. We currently do not have any finance leases. Impairment of Long-Lived Assets We evaluate long-lived assets or asset groups for impairment whenever events indicate that the carrying value of an asset or asset group may not be recoverable based on expected future cash flows attributable to that asset or asset group. Recoverability of assets held and used is measured by comparing the carrying amount of an asset or an asset group to estimated undiscounted future net cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset or asset group exceeds estimated undiscounted future cash flows, then an impairment charge would be recognized based on the excess of the carrying amount of the asset or asset group over its fair value. Assets to be disposed of are reported at the lower of their carrying amount or fair value, less costs to sell. There were no impairment charges recognized related to long-lived assets during the fiscal years ended January 31, 2020, 2019, or 2018. Revenue Recognition We derive our revenue from subscription agreements with customers for access to our video-first communications platform and services. Revenue is recognized when a customer obtains control of promised services. The amount of revenue recognized reflects the consideration that we expect to receive in exchange for these services. We determine revenue recognition through the following steps: 1. Identification of the contract, or contracts, with the customer We determine a contract with a customer to exist when the contract is approved, each party’s rights regarding the services to be transferred can be identified, the payment terms for the services can be identified, the customer has the ability and intent to pay, and the contract has commercial substance. At contract inception, we will evaluate whether two or more contracts should be combined and accounted for as a single contract and whether the combined or single contract includes more than one performance obligation. We apply judgment in determining the customer’s ability and intent to pay, which is based on a variety of factors, including the customer’s historical payment experience or, in the case of a new customer, credit and financial information pertaining to the customer. 2. Identification of the performance obligations in the contract Performance obligations committed in a contract are identified based on the services that will be transferred to the customer that are both capable of being distinct, whereby the customer can benefit from the service either on its own or together with other resources that are readily available from third parties or from us, and are distinct in the context of the contract, whereby the transfer of the services and the products is separately identifiable from other promises in the contract. Our performance obligations generally consist of access to our video-first communications platform and related support services, which is considered one performance obligation. Our customers do not have the ability to take possession of our software, and through access to our platform, we provide a series of distinct software-based services that are satisfied over the term of the subscription. We also provide services, which include professional services, consulting services, and online event hosting, which are generally considered distinct from the access to our video-first communications platform. 3. Determination of the transaction price The transaction price is determined based on the consideration to which we expect to be entitled in exchange for transferring services to the customer. Variable consideration is included in the transaction price if, in our judgment, it is probable that a significant future reversal of cumulative revenue recognized under the contract will not occur. None of our contracts contain a significant financing component. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental entities (e.g., sales and other indirect taxes). Our video-first communications platform and related support services are typically warranted to perform in a professional manner that will comply with the terms of the subscription agreements. In addition, we include service-level commitments to our customers warranting certain levels of uptime reliability and performance and permitting those customers to receive credits in the event that we fail to meet those service levels. These credits represent a form of variable consideration. Historically, we have not experienced any significant incidents affecting the defined levels of reliability and performance as required by the subscription agreements. We have not provided any material refunds related to these agreements in the consolidated financial statements during the periods presented. 4. Allocation of the transaction price to the performance obligations in the contract Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation based on each performance obligation’s relative standalone selling price. As noted above, access to our video-first communications platform and related support services are considered one performance obligation in the context of the contract and accordingly the transaction price is allocated to this single performance obligation. 5. Recognition of the revenue when, or as, a performance obligation is satisfied Revenue is recognized at the time the related performance obligation is satisfied by transferring the control of the promised service to a customer. Revenue is recognized in an amount that reflects the consideration that we expect to receive in exchange for those services. Fees for access to our video-first communications platform and related support services are subscription revenue and are considered one performance obligation, and the related revenue is recognized ratably over the subscription period as we satisfy the performance obligation. Professional services are time-based arrangements and revenue is recognized as these services are performed. Fees for services represent less than 2% of total revenue during the periods presented. Cost of Revenue Cost of revenue primarily consists of costs related to hosting our video-first communications platform and providing general operating support services to our customers. These costs are composed of co-located data center costs, third-party cloud hosting costs, integrated third-party PSTN services, personnel-related expenses, amortization of capitalized software development costs, and allocated overhead costs. Indirect overhead associated with corporate facilities and related depreciation is allocated to cost of revenue and operating expenses based on applicable headcount. Research and Development Research and development costs include personnel-related expenses associated with our engineering personnel and consultants responsible for the design, development, and testing of our video-first communications platform, depreciation of equipment used in research and development, and allocated overhead costs. Research and development costs are expensed as incurred. Advertising Costs Advertising costs are expensed as incurred in sales and marketing expense and amounted to $42.0 million, $36.1 million, and $17.1 million for the fiscal years ended January 31, 2020, 2019, and 2018, respectively. Stock-Based Compensation Stock-based compensation expense related to stock awards (including stock options, restricted stock awards (“RSAs”), RSUs, and ESPP) is measured based on the fair value of the awards granted and recognized as an expense on a straight-line basis over the requisite service period for stock options, RSAs and RSUs, and over the offering period for the purchase rights issued under the ESPP. The fair value of each option and ESPP award is estimated on the grant date using the Black-Scholes option pricing model. The Black-Scholes option pricing model requires the input of highly subjective assumptions, including the fair value of the underlying common stock, the expected term of the award, the expected volatility of the price of our common stock, risk-free interest rates, and the expected dividend yield of our common stock. The fair value of each RSA and RSU award is based on the fair value of the underlying common stock as of the grant date. The assumptions used to determine the fair value of the stock awards represent management’s best estimates. These estimates involve inherent uncertainties and the application of management’s judgment. We account for forfeitures as they occur instead of estimating the number of awards expected to be forfeited. Foreign Currency The functional currency of our foreign subsidiaries is the U.S. dollar. Accordingly, monetary assets and liabilities of our foreign subsidiaries are remeasured into U.S. dollars at the exchange rates in effect at the reporting date, non-monetary assets and liabilities are remeasured at historical rates, and revenue and expenses are remeasured at average exchange rates in effect during each reporting period. Foreign currency related gains and losses have been immaterial during the periods presented. Income Taxes We use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. We must then assess the likelihood that the resulting deferred tax assets will be realized. A valuation allowance is provided when it is more likely than not that a deferred tax asset will not be fully realized. Management believes it is more likely than not that deferred tax assets in the United States and the U.K. will not be realized and, accordingly, a valuation allowance has been established on such deferred tax assets. We recognize benefits of uncertain tax positions if it is more likely than not that such positions will be sustained upon examination based solely on their technical merits at the largest amount of benefit that is more likely than not to be realized upon the ultimate settlement. Our policy is to recognize interest and penalties related to the underpayment of income taxes as a component of income tax expense or benefit. The calculation of tax liabilities involves significant judgment in estimating the impact of uncertainties in the application of GAAP and U.S. and foreign tax laws. The resolution of these uncertain tax positions in a manner inconsistent with management’s expectations could have a material impact on our consolidated financial statements. Net Income (Loss) Per Share Attributable to Common Stockholders We calculate our net income (loss) per share attributable to Class A and Class B common stock using the two-class method required for companies with participating securities. We consider our convertible preferred stock and unvested common stock, which includes early exercised stock options and RSAs, to be participating securities as holders of such securities have non-forfeitable dividend rights in the event of our declaration of a dividend for shares of common stock. During the periods when we are in a net loss position, the net loss attributable to common stockholders was not allocated to the convertible preferred stock and unvested common stock under the two-class method as these securities do not have a contractual obligation to share in our losses. Distributed and undistributed earnings allocated to participating securities are subtracted from net income (loss) in determining net income (loss) attributable to common stockholders. Basic net income (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the weighted-average number of shares of our Class A and Class B common stock outstanding. The diluted net income per share attributable to common stockholders is computed by giving effect to all dilutive securities. Diluted net income per share attributable to common stockholders is computed by dividing the resulting net income attributable to common stockholders by the weighted-average number of fully diluted common shares outstanding. During the periods when there is a net loss attributable to common stockholders, potentially dilutive common stock equivalents have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is anti-dilutive. Segment Information We operate in one operating segment. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker, who is our Chief Executive Officer (“CEO”), in deciding how to allocate resources and assessing performance. Our chief operating decision maker allocates resources and assesses performance based upon consolidated financial information. Revenue by geographical region can be found in the revenue recognition disclosures in Note 2 below. The following table presents our property and equipment, net of depreciation and amortization, by geographic region: As of January 31, 2020 2019 (in thousands) Americas $ 48,519 $ 26,048 APAC 7,464 8,928 EMEA 1,155 2,299 Total property and equipment, net $ 57,138 $ 37,275 Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which replaces the existing incurred loss impairment model with an expected credit loss model and requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. The guidance will be effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. We do not expect the adoption to have a material impact on our consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-use Software (subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract . The amendment aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The guidance will be effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. We are currently evaluating whether the adoption of this standard will have a material impact on our consolidated financial statements. Recently Adopted

Revenue Recognition

Revenue Recognition	12 Months Ended
	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Disaggregation of Revenue The following table summarizes revenue by region based on the billing address of customers: Year Ended January 31, 2020 2019 2018 Amount Percentage of Amount Percentage of Amount Percentage of (in thousands, except percentages) Americas $ 500,622 81 % $ 270,132 82 % $ 125,428 83 % APAC 51,152 8 27,720 8 13,652 9 EMEA 70,884 11 32,665 10 12,398 8 Total $ 622,658 100 % $ 330,517 100 % $ 151,478 100 % Contract Balances We receive payments from customers based on a billing schedule as established in our customer contracts. Accounts receivable are recorded when we contractually have the right to consideration. In some arrangements, a right to consideration for our performance under the customer contract may occur before invoicing to the customer, resulting in an unbilled accounts receivable. The amount of unbilled accounts receivable included within accounts receivable, net of allowances in the consolidated balance sheets was $12.5 million and $7.2 million as of January 31, 2020 and 2019, respectively. Contract liabilities consist of deferred revenue. Revenue is deferred when we have the right to invoice in advance of performance under a customer contract. The current portion of deferred revenue balances is recognized over the next 12 months. The amount of revenue recognized during the fiscal years ended January 31, 2020, 2019, and 2018 that was included in deferred revenue at the beginning of each period was $119.1 million, $50.3 million, and $21.3 million, respectively. Remaining Performance Obligation The terms of our subscription agreements are monthly, annual, and multiyear and we may bill for the full term in advance or on an annual or monthly basis, depending on the billing terms with customers. As of January 31, 2020, the aggregate amount of the transaction price allocated to our remaining performance obligations was $604.1 million, which consists of both billed consideration in the amount of $230.5 million and unbilled consideration in the amount of $373.6 million that we expect to recognize as revenue. We expect to recognize 62% of our remaining performance obligations as revenue over the next 12 months and the remainder thereafter. Cost to Obtain a Contract We capitalize sales commissions and associated payroll taxes paid to internal sales personnel that are incremental to the acquisition of customer contracts. These costs are recorded as deferred contract acquisition costs on the consolidated balance sheets. We determine whether costs should be deferred based on our sales compensation plans and if the commissions are incremental and would not have occurred absent the customer contract. Sales commissions paid upon the initial acquisition of a customer contract are amortized over an estimated period of benefit of three years, which is typically greater than the contractual terms of the customer contracts. We do not pay sales commissions upon contract renewal. Amortization is recognized on a straight-line basis commensurate with the pattern of revenue recognition. We determine the period of benefit for commissions paid for the acquisition of the initial customer contract by taking into consideration the initial estimated customer life and the technological life of our video-first communications platform and related significant features. Amortization of deferred contract acquisition costs is included in sales and marketing expense in the consolidated statements of operations. We periodically review these deferred contract acquisition costs to determine whether events or changes in circumstances have occurred that could impact the period of benefit. There were no impairment losses recorded during the periods presented. The following table represents a rollforward of deferred contract acquisition costs: Year Ended January 31, 2020 2019 (in thousands) Beginning balance $ 55,516 $ 30,586 Additions to deferred contract acquisition costs 72,715 45,769 Amortization of deferred contract acquisition costs (37,101) (20,839) Ending balance $ 91,130 $ 55,516 Deferred contract acquisition costs, current (to be amortized in next 12 months) $ 44,885 $ 26,453 Deferred contract acquisition costs, noncurrent 46,245 29,063 Total deferred contract acquisition costs $ 91,130 $ 55,516

Marketable Securities

Marketable Securities	12 Months Ended
	Jan. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Marketable Securities	Marketable Securities As of January 31, 2020 and 2019, our marketable securities consisted of the following: As of January 31, 2020 Amortized Gross Gross Estimated (in thousands) Commercial paper $ 37,894 $ — $ — $ 37,894 Agency bonds 141,157 49 (43) 141,163 Corporate and other debt securities 320,407 775 (16) 321,166 U.S. government agency securities 71,794 45 (2) 71,837 Marketable securities $ 571,252 $ 869 $ (61) $ 572,060 As of January 31, 2019 Amortized Gross Gross Estimated (in thousands) Commercial paper $ 1,243 $ — $ — $ 1,243 Corporate bonds 53,267 — (53) 53,214 Agency bonds 32,675 — (71) 32,604 U.S. government agency securities 24,028 — (11) 24,017 Treasury bills 1,699 — — 1,699 Marketable securities $ 112,912 $ — $ (135) $ 112,777 We review the individual securities that have unrealized losses on a regular basis to evaluate whether or not any security has experienced an other-than-temporary decline in fair value. We evaluate, among other factors, whether we have the intention to sell any of these marketable securities and whether it is more likely than not that we will be required to sell any of them before recovery of the amortized cost basis. Based on the available evidence, we concluded that the gross unrealized losses on the marketable securities as of January 31, 2020 and 2019, are temporary in nature. There were no material realized gains or losses from available-for-sale securities that were reclassified out of accumulated other comprehensive income (loss) for the fiscal years ended January 31, 2020, 2019, and 2018. The following table presents the contractual maturities of our marketable securities as of January 31, 2020 and 2019: As of January 31, 2020 2019 (in thousands) Less than one year $ 315,900 $ 85,077 Due in one to five years 256,160 27,700 Total $ 572,060 $ 112,777

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Jan. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following tables present information about our financial instruments that are measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value: As of January 31, 2020 Fair Value Level 1 Level 2 Level 3 (in thousands) Financial Assets: Money market funds $ 96,486 $ 96,486 $ — $ — Commercial paper 4,994 — 4,994 — Agency bonds 9,999 — 9,999 — Cash equivalents 111,479 96,486 14,993 — Commercial paper 37,894 — 37,894 — Agency bonds 141,163 — 141,163 — Corporate and other debt securities 321,166 — 321,166 — U.S. government agency securities 71,837 — 71,837 — Marketable securities 572,060 — 572,060 — Certificate of deposit included in prepaid expenses and other current assets 100 — 100 — Certificates of deposit included in other assets, noncurrent 2,301 — 2,301 — Total financial assets $ 685,940 $ 96,486 $ 589,454 $ — As of January 31, 2019 Fair Value Level 1 Level 2 Level 3 (in thousands) Financial Assets: Money market funds $ 78 $ 78 $ — $ — Cash equivalents 78 78 — — Commercial paper 1,243 — 1,243 — Corporate bonds 53,214 — 53,214 — Agency bonds 32,604 — 32,604 — U.S. government agency securities 24,017 — 24,017 — Treasury bills 1,699 — 1,699 — Marketable securities 112,777 — 112,777 — Certificate of deposit included in prepaid expenses and other current assets 200 — 200 — Certificates of deposit included in other assets, noncurrent 2,144 — 2,144 — Total financial assets $ 115,199 $ 78 $ 115,121 $ — Financial Liabilities: Convertible promissory notes – derivative liabilities included in other liabilities, noncurrent $ 163 $ — $ — $ 163 Total financial liabilities $ 163 $ — $ — $ 163

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 Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following: As of January 31, 2020 2019 (in thousands) Restricted cash from international employee stock sales $ 48,547 $ — Prepaid expenses 22,320 9,263 Other 4,141 989 Prepaid expenses and other current assets $ 75,008 $ 10,252 Property and Equipment, Net Property and equipment consisted of the following: As of January 31, 2020 2019 (in thousands) Computer and office equipment $ 51,375 $ 32,515 Leasehold improvements 18,215 7,660 Software 10,855 6,575 Furniture and fixtures 3,949 1,993 Property and equipment, gross 84,394 48,743 Less: accumulated depreciation and amortization (27,256) (11,468) Property and equipment, net $ 57,138 $ 37,275 Depreciation and amortization expense was $16.4 million, $7.0 million, and $2.8 million for the fiscal years ended January 31, 2020, 2019, and 2018, respectively. Other Assets, Noncurrent Other assets, noncurrent consisted of the following: As of January 31, 2020 2019 (in thousands) Accounts receivable, noncurrent $ 9,011 $ 3,264 Equity investment 3,000 — Other 10,321 8,244 Other assets, noncurrent $ 22,332 $ 11,508 Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following: As of January 31, 2020 2019 (in thousands) Liabilities to employees and tax authorities from international employee stock sales $ 49,287 $ — Accrued compensation and benefits 36,732 12,004 Accrued expenses 17,475 13,596 Operating lease liabilities, current 7,675 — Other 11,523 6,656 Accrued expenses and other current liabilities $ 122,692 $ 32,256 Other Liabilities, Noncurrent Other liabilities, noncurrent consisted of the following: As of January 31, 2020 2019 (in thousands) Sales and other tax liabilities $ 33,957 $ 20,817 Convertible promissory notes, net of debt discount — 14,858 Other 2,329 3,785 Other liabilities, noncurrent $ 36,286 $ 39,460

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Jan. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Non-cancelable Purchase Obligations In the normal course of business, we enter into non-cancelable purchase commitments with various parties to purchase primarily software-based services. As of January 31, 2020, we had outstanding non-cancelable purchase obligations with a term of 12 months or longer of $86.1 million. Indemnifications and Contingency Our agreements with certain larger customers include certain provisions for indemnifying customers against liabilities if our services infringe a third party’s intellectual property rights. It is not possible to determine the maximum potential amount under these indemnification obligations due to the limited history of prior indemnification claims and the unique facts and circumstances that may be involved in each particular agreement. To date, we have not incurred any material costs as a result of such provisions and have not accrued any liabilities related to such obligations in our consolidated financial statements. In addition, we have indemnification agreements with our directors and our executive officers that require us, among other things, to indemnify our directors and executive officers for costs associated with any fees, expenses, judgments, fines, and settlement amounts incurred by any of those persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a director or officer, including any action by us, arising out of that person’s services as our director or officer or that person’s services provided to any other company or enterprise at our request. We maintain director and officer insurance coverage that may enable us to recover a portion of any future indemnification amounts paid. To date, there have been no claims under any of our directors’ and executive officers’ indemnification provisions. Sales and Other Tax Liabilities We conduct operations in many tax jurisdictions. In many jurisdictions, non-income-based taxes, such as sales and use tax and other indirect taxes, are assessed on our operations. Although we are diligent in collecting and remitting such taxes, there is uncertainty as to what constitutes sufficient presence for a jurisdiction to levy taxes, fees, and surcharges for sales made over the Internet. As of January 31, 2020 and 2019, we recorded sales and other tax liabilities of $37.7 million and $22.0 million, respectively, of which $3.7 million and $1.2 million are included in accrued expenses and other current liabilities, respectively, and $34.0 million and $20.8 million are included in other liabilities, noncurrent, respectively, on our consolidated balance sheets, based on our best estimate of the probable liability for the loss contingency incurred as of those dates. Our estimate of a probable outcome under the loss contingency is based on analysis of our sales and marketing activities, revenue subject to sales tax, and applicable regulations in applicable jurisdictions in each period. No significant adjustments to the sales and other tax liabilities have been recognized in the accompanying consolidated financial statements for changes to the assumptions underlying the estimate; however, changes in our assumptions may occur in the future as we obtain new information which can result in adjustments to the recorded liability. Other Contingencies Our platform and associated products are subject to various restrictions under U.S. export control and sanctions laws and regulations, including the U.S. Department of Commerce’s EAR and various economic and trade sanctions regulations administered by the U.S. Treasury Department’s Office of Foreign Assets Controls (“OFAC”). The U.S. export control laws and U.S. economic sanctions laws include restrictions or prohibitions on the sale or supply of certain products and services to U.S. embargoed or sanctioned countries, governments, persons, and entities, and also require authorization for the export of certain encryption items. In addition, various countries regulate the import of certain encryption technology, including through import permitting and licensing requirements and have enacted or could enact laws that could limit our ability to distribute our platform or could limit our hosts’ ability to implement our platform in those countries. Although we take precautions to prevent our platform and associated products from being accessed or used in violation of such laws, we have inadvertently allowed our platform and associated products to be accessed or used by some customers in apparent violation of U.S. economic sanction laws. In addition, we may have inadvertently made our software products available to some customers, including users in embargoed or sanctioned countries, in apparent violation of the EAR. As a result, we have submitted initial and final voluntary self-disclosures concerning potential violations of U.S. sanctions and export control laws and regulations to the OFAC and the U.S. Department of Commerce’s BIS. In June 2019, OFAC and BIS issued us warning letters as their final enforcement responses to these potential violations, but no fines or penalties were assessed. If we are found to be in violation of U.S. economic sanctions or export control laws in the future, it could result in fines and penalties. Legal Proceedings In the ordinary course of business, we may be subject from time to time to various proceedings, lawsuits, disputes, or claims. Although we cannot predict with assurance the outcome of any litigation, we do not believe there are currently any such actions that, if resolved unfavorably, would have a material impact on our financial condition, results of operations, or cash flows.

Convertible Promissory Notes

Convertible Promissory Notes	12 Months Ended
	Jan. 31, 2020
Debt Disclosure [Abstract]
Convertible Promissory Notes	Convertible Promissory Notes In October 2018, we entered into a strategic partnership with Dropbox, Inc. (“Dropbox”), a global collaboration platform company, which involves the development of technology enabling integrated workflows for users between our platform and the Dropbox platform, as well as a strategic partnership with Atlassian, Inc. (“Atlassian”), a collaboration software company, which involves the development of technology enabling integrated workflows for users between our platform and Atlassian’s Jira Ops and Jira Service Desk products. As part of the strategic partnerships, we issued unsecured three In connection with the IPO, the convertible notes and accrued interest automatically converted into 426,223 shares of Class A common stock based on the IPO price of $36.00 per share. As a result of the conversion, the related $0.2 million derivative liabilities and the $0.1 million unamortized debt discount of the convertible notes were recognized in interest income and other, net in the consolidated statements of operations during the fiscal year ended January 31, 2020.

Operating Leases

Operating Leases	12 Months Ended
	Jan. 31, 2020
Leases [Abstract]
Operating Leases	Operating Leases We have entered into various operating lease agreements for office space, with remaining contractual periods of up to 10 years. Many of our leases contain one or more options to extend. As leases approach maturity, we consider various factors such as market conditions and the terms of any renewal options that may exist to determine whether we are reasonably certain to exercise the options to extend the lease. Operating lease expense for the fiscal year ended January 31, 2020 was $9.7 million, excluding short-term lease costs, variable lease costs, and sublease income, each of which was immaterial for the fiscal year ended January 31, 2020 . Supplemental balance sheet information as of January 31, 2020, related to operating leases was as follows: As of January 31, 2020 (in thousands) Reported as: Assets: Operating lease right-of-use assets $ 68,608 Liabilities: Accrued expenses and other current liabilities $ 7,675 Operating lease liabilities, noncurrent 64,792 Total operating lease liabilities $ 72,467 As of January 31, 2020, the weighted-average remaining lease term is 7.5 years and the weighted-average discount rate is 5.1%. Supplemental cash flow and other information for the fiscal year ended January 31, 2020, related to operating leases was as follows: Year Ended (in thousands) Cash payments included in the measurement of our operating lease liabilities $ 9,774 Operating lease right-of-use assets recognized in exchange for new operating lease obligations $ 34,993 As of January 31, 2020, the future minimum lease payments included in the measurement of our operating lease liabilities are as follows: As of January 31, 2020 (in thousands) Year Ending January 31, 2021 $ 11,170 2022 12,191 2023 12,177 2024 11,541 2025 11,348 Thereafter 29,383 Total operating lease payments $ 87,810 Less: imputed interest (15,343) Total operating lease liabilities $ 72,467 As previously disclosed in Note 6. “Commitments and Contingencies” to Notes to Consolidated Financial Statements in our Prospectus and under the previous lease accounting standard, future minimum payments related to operating leases as of January 31, 2019 are as follows: As of January 31, 2019 (in thousands) Year Ending January 31, 2020 $ 7,609 2021 7,837 2022 7,888 2023 7,514 2024 7,174 Thereafter 18,635 Total future minimum payments $ 56,657 Under the previous lease standard, rent expense during the fiscal years ended January 31, 2019 and 2018 was $7.2 million and $3.3 million, respectively.

Convertible Preferred Stock, St

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan	12 Months Ended
	Jan. 31, 2020
Equity [Abstract]
Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan	Convertible Preferred Stock, Stockholders’ Equity (Deficit), and Equity Incentive Plan Convertible Preferred Stock Convertible preferred stock consisted of the following as of January 31, 2019 and as of immediately prior to the automatic conversion of convertible preferred stock into common stock: As of January 31, 2019 Designated Shares Issued Aggregate (in thousands, except share data) Series A 67,083,500 61,717,700 $ 9,258 Series B 25,857,784 25,857,784 6,500 Series C 34,363,256 34,363,256 30,000 Series D 30,800,000 30,727,064 114,966 Total convertible preferred stock 158,104,540 152,665,804 $ 160,724 Upon completion of the IPO in April 2019, all shares of convertible preferred stock outstanding, totaling 152,665,804 shares, were automatically converted into an equivalent number of shares of Class B common stock on a one-to-one basis and their carrying value of $159.6 million was reclassified into stockholders’ equity. As of January 31, 2020, there were no shares of convertible preferred stock issued and outstanding. In connection with the IPO, our amended and restated certificate of incorporation became effective, which authorized the issuance of 200,000,000 shares of undesignated preferred stock with a par value of $0.001 with rights and preferences, including voting rights, designated from time to time by our board of directors. Repurchases of Convertible Preferred Stock In fiscal year 2018, we voluntarily repurchased 1,365,800 shares of Series A convertible preferred stock from certain existing investors for a total consideration of $4.6 million. The amount paid in excess of the carrying value of the Series A convertible preferred stock is considered a deemed dividend and is reflected as distributed earnings attributable to participating securities in the calculation of net loss attributable to common stockholders. The shares of Series A convertible preferred stock that we repurchased were retired immediately thereafter. Dual-Class Common Stock Structure In November 2018, we implemented a dual class common stock structure pursuant to which all the then-outstanding shares of our common stock were reclassified as Class B common stock and a new class of Class A common stock was authorized. The Class A common stock is entitled to one vote per share and the Class B common stock is entitled to 10 votes per share. The Class A and Class B common stock have the same dividend and liquidation rights. Each share of Class B common stock will automatically convert into one share of Class A common stock upon (a) any transfer of such share, except for certain permitted transfers described in our amended and restated certificate of incorporation and (b) the death of the holder of such share. In addition, each share of Class B common stock will be automatically converted into one share of Class A common stock upon the earliest of (a) the date that is six months following the death or incapacity of Eric S. Yuan (our CEO), (b) the date that is six months following the date that Mr. Yuan is no longer providing services to us or his employment is terminated for cause, (c) the date specified by the holders of a majority of the then-outstanding shares of convertible preferred stock, voting together on an as-converted basis, and the holders of a majority of the then-outstanding shares of Class B common stock, voting as a separate class, and (d) the 15-year anniversary of the closing of our IPO. In connection with the implementation of the dual-class common stock structure, each then-outstanding share of our convertible preferred stock became convertible into one share of Class B common stock, and all outstanding options to purchase shares of common stock became options to purchase an equivalent number of shares of Class B common stock. Upon the effectiveness of the amended and restated certificate of incorporation in November 2018, the number of shares of common stock that is authorized to be issued consisted of 320,000,000 shares of Class A common stock, $0.001 par value per share and 300,000,000 shares of Class B common stock, $0.001 par value per share. Class A and Class B common stock are collectively referred to as “common stock” throughout the notes to the consolidated financial statements, unless otherwise noted. Common Stock Upon the completion of the IPO in April 2019, our amended and restated certificate of incorporation became effective, which also authorized the issuance of 2,000,000,000 shares of Class A common stock, $0.001 par value per share and 300,000,000 shares of Class B common stock, $0.001 par value per share. We have the following shares of common stock reserved for future issuance: As of January 31, 2020 2019 Conversion of convertible preferred stock — 152,665,804 Stock options outstanding 16,833,009 35,064,465 RSUs outstanding 1,964,668 — ESPP purchase rights outstanding 1,323,662 — Remaining shares available for future issuance under the 2011 and 2019 plan 33,604,587 1,848,100 Remaining shares available for future issuance under the ESPP 7,186,070 — Total shares of common stock reserved 60,911,996 189,578,369 Equity Incentive Plans In 2011, we adopted the 2011 Global Share Plan (“2011 Plan”), under which officers, employees, and consultants may be granted various forms of equity incentive compensation at the discretion of the board of directors, including stock options and restricted stock awards. The awards have varying terms, but generally vest over four In April 2019, we adopted the 2019 Plan, which is a successor to and continuation of our 2011 Plan. Our 2019 Plan provides for the grant of stock options, stock appreciation rights, restricted stock awards, RSU awards, performance awards, and other forms of awards. The plan administrator determines the term of stock options granted under the 2019 Plan, up to a maximum of 10 years. The maximum number of shares of our Class A common stock that may be issued under our 2019 Plan will not exceed 58,300,889 shares of our Class A common stock, which is the sum of (1) 34,000,000 new shares, plus (2) an additional number of shares not to exceed 24,300,889, consisting of (A) shares that remain available for the issuance of awards under our 2011 Plan as of immediately prior to the time our 2019 Plan becomes effective and (B) shares of Class B common stock subject to outstanding stock options or other stock awards granted under our 2011 Plan that, on or after the 2019 Plan becomes effective, terminate, or expire prior to exercise or settlement; are not issued because the award is settled in cash; are forfeited because of the failure to vest; or are reacquired or withheld (or not issued) to satisfy a tax withholding obligation or the purchase or exercise price, if any, as such shares become available from time to time. In addition, the number of shares of our Class A common stock reserved for issuance under our 2019 Plan will automatically increase on February 1 of each calendar year, starting on February 1, 2020 through February 1, 2029, in an amount equal to (i) 5% of the total number of shares of our common stock (both Class A and Class B) outstanding on January 31 of the fiscal year before the date of each automatic increase or (ii) a lesser number of shares determined by our board of directors prior to the applicable February 1. Stock Options A summary of stock option activity under our equity incentive plan and related information is as follows: Stock Options Outstanding Weighted- Weighted- Aggregate (in thousands, except share, life and per share data) Balance as of January 31, 2019 35,064,465 $ 1.48 6.8 $ 534,572 Granted 1,576,150 $ 36.86 Exercised (19,003,652) $ 0.49 $ 767,336 Canceled/forfeited/expired (803,954) $ 5.15 Balance as of January 31, 2020 16,833,009 $ 5.73 7.6 $ 1,191,881 Vested and exercisable as of January 31, 2020 7,248,393 $ 1.78 6.8 $ 540,222 The weighted-average grant date fair value of options granted to employees during the fiscal years ended January 31, 2020, 2019, and 2018 was $25.17, $6.28, and $0.67, respectively. The intrinsic value of the options exercised, which represents the difference between the fair market value of our common stock on the date of exercise and the exercise price of each option, was $767.3 million, $60.8 million, and $2.5 million during the fiscal years ended January 31, 2020, 2019, and 2018, respectively. As of January 31, 2020, unrecognized stock-based compensation cost related to outstanding unvested stock options was $76.6 million, which is expected to be recognized over a weighted-average period of 2.8 years. The Black-Scholes assumptions used to value the employee options at the grant dates are as follows: Year Ended January 31, 2020 2019 2018 Expected term (years) 5.0 - 6.1 5.0 - 6.2 5.6 - 6.7 Expected volatility 49.9% - 53.2% 44.6% - 48.2% 47.7% - 52.0% Risk-free interest rate 1.6% - 2.5% 2.6% - 3.1% 1.8% - 2.3% Expected dividend yield — — — These assumptions and estimates were determined as follows: • Fair Value of Common Stock. Prior to our IPO, the fair value was determined by our board of directors, with input from management and valuation reports prepared by third-party valuation specialists. Stock-based compensation for financial reporting purposes is measured based on updated estimates of fair value when appropriate, such as when additional relevant information related to the estimate becomes available in a valuation report issued as of a subsequent date. After our initial public offering, the fair value of each share of underlying common stock was based on the closing price of our Class A common stock as reported on the date of the grant. • Risk-Free Interest Rate. The risk-free interest rate for the expected term of the options was based on the U.S. Treasury yield curve in effect at the time of the grant. • Expected Term. The expected term of options represents the period of time that options are expected to be outstanding. Our historical stock option exercise experience does not provide a reasonable basis upon which to estimate an expected term due to a lack of sufficient data. For stock options granted to employees, we estimate the expected term by using the simplified method. The simplified method calculates the expected term as the average of the time-to-vesting and the contractual life of the stock options. For stock options granted to nonemployees, the expected term equals the contractual term of the stock option. • Expected Volatility. As we have a short trading history for our common stock, the expected volatility was estimated by taking the average historic price volatility for industry peers, consisting of several public companies in our industry that are similar in size, stage of life cycle, or financial leverage, over a period equivalent to the expected term of the awards. • Expected Dividend Yield. We have never declared or paid any cash dividends and do not presently plan to pay cash dividends in the foreseeable future. As a result, an expected dividend yield of zero percent was used. Restricted Stock Units A summary of RSU activity under our equity incentive plan and related information is as follows: RSUs Unvested Weighted-Average Unvested as of January 31, 2019 — $ — Granted 2,048,248 $ 79.22 Vested (31,649) $ 78.23 Canceled/forfeited (51,931) $ 84.00 Unvested as of January 31, 2020 1,964,668 $ 79.11 As of January 31, 2020, unrecognized stock-based compensation expense related to outstanding unvested RSUs was $142.8 million, which is expected to be recognized over a weighted-average period of 3.6 years. 2019 Employee Stock Purchase Plan In April 2019, we adopted the 2019 ESPP, which became effective in connection with the IPO. A total of 9,000,000 shares of our Class A common stock were initially reserved for issuance under the ESPP. The number of shares of our Class A common stock reserved for issuance will automatically increase on February 1 of each calendar year, beginning on February 1, 2020 through February 1, 2029, by the lesser of (1) 1% of the total number of shares of our common stock (both Class A and Class B) outstanding on the last day of the fiscal year before the date of the automatic increase, and (2) 7,500,000 shares; provided that before the date of any such increase, our board of directors may determine that such increase will be less than the amount set forth in clauses (1) and (2). Generally, all regular employees, including executive officers, employed by us or by any of our designated affiliates, except for those holding 5% or more of the total combined voting power or value of all classes of our stock, may participate in the ESPP and may contribute, normally through payroll deductions, up to 20% of their earnings (as defined in the ESPP) for the purchase of our Class A common stock under the ESPP. Unless otherwise determined by our board of directors, Class A common stock will be purchased for the accounts of employees participating in the ESPP at a price per share equal to the lesser of (1) 85% of the fair market value of a share of our Class A common stock on the first date of an offering or (2) 85% of the fair market value of a share of our Class A common stock on the date of purchase. No employee may purchase shares under the ESPP at a rate in excess of $25,000 worth of our Class A common stock based on the fair market value per share of our Class A common stock at the beginning of an offering for each calendar year such purchase right is outstanding or 3,000 shares. The 2019 ESPP provides for, at maximum, 27 months offering periods with four offering dates, generally in June and December of each year. The first offering period began on April 18, 2019. As of January 31, 2020, 490,268 shares of our Class A common stock have been purchased under the ESPP. As of January 31, 2020, unrecognized stock-based compensation expense related to the ESPP was $55.7 million, which is expected to be recognized over a weighted-average period of 1.4 years. We estimated the fair value of ESPP purchase rights using a Black-Scholes option-pricing model with the following assumptions: Year Ended Expected term (years) 0.5 - 2.1 Expected volatility 40.3% - 56.2% Risk-free interest rate 1.5% - 2.5% Expected dividend yield — Early Exercise of Common Stock Options Our board of directors authorized certain stock option holders to exercise unvested stock options to purchase shares of common stock. Shares received from such early exercises are subject to repurchase in the event of the optionee’s termination of service, at the original issuance price, until the stock options are fully vested. As of January 31, 2020 and 2019, 466,819 and 1,261,230 shares of Class B common stock, respectively, were subject to repurchase at a weighted-average price of $2.58 and $1.41 per share, respectively. The cash proceeds received for unvested shares of common stock recorded within accrued expenses and other current liabilities in the consolidated balance sheets were $1.2 million and $1.8 million as of January 31, 2020 and 2019, respectively. Third-Party Stock Transactions In May 2017, our CEO sold 2,899,136 shares of our common stock to an existing investor at a per share price of $3.74. In the consolidated statements of operations for fiscal year 2018, due to the fact that the purchase was made by an economic interest holder and is presumptively considered compensatory under GAAP, we recognized stock-based compensation expense related to such stock sale of $8.6 million, the difference between the purchase price and the fair value of our common stock at the time of sale. Shares Reserved for Charitable Donations During the fiscal year ended January 31, 2020, our board of directors approved the issuance of 500,000 shares of Class A common stock for the sole purpose of being transferred to a nonprofit organization to be formed or identified by us at a future time. As of January 31, 2020, no shares have been transferred to a nonprofit organization. As a result, no expense has been recognized to date. Stock-Based Compensation The stock-based compensation expense by line item in the accompanying consolidated statements of operations is summarized as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Cost of revenue $ 7,860 $ 1,119 $ 204 Research and development 11,645 1,369 360 Sales and marketing 41,465 3,540 812 General and administrative 12,139 2,913 8,953 Total stock-based compensation expense $ 73,109 $ 8,941 $ 10,329

Income Taxes

Income Taxes	12 Months Ended
	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of the net income (loss) before the provision for income taxes were as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Domestic $ 16,268 $ (204) $ (3,782) Foreign 10,094 8,553 264 Total $ 26,362 $ 8,349 $ (3,518) The provision for income taxes was as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Current: Federal $ — $ — $ — State 14 80 46 Foreign 2,226 685 258 Total current income tax expense 2,240 765 304 Deferred: Federal — — — State — — — Foreign (1,183) — — Total deferred income tax expense (1,183) — — Total provision for income taxes $ 1,057 $ 765 $ 304 The provision for income taxes differs from the amount computed by applying the statutory federal tax rate as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Tax at federal statutory rate $ 5,536 $ 1,764 $ (1,157) State taxes 14 67 45 Foreign rate differential (2,096) (1,627) (26) Stock-based compensation (32,070) 1,662 3,272 Permanent items 1,009 809 117 Research and development credits (2,808) (289) (150) Tax uncertainties 1,019 515 516 Change in valuation allowance 30,932 (1,438) (1,537) Change in federal tax rate — — (881) Other (479) (698) 105 Total $ 1,057 $ 765 $ 304 Effective tax rate 4.0 % 9.2 % (8.6) % Deferred income taxes result from differences in the recognition of amounts for tax and financial reporting purposes, as well as operating loss and tax credit carryforwards. Significant components of our deferred income tax assets as of January 31, 2020 and 2019 are as follows: As of January 31, 2020 2019 (in thousands) Deferred tax assets: Net operating loss carryforwards $ 37,507 $ 6,517 Research and development credit carryforwards 5,701 972 Stock-based compensation 4,145 133 Accruals and reserves 11,586 6,856 Deferred revenue 5,234 2,646 Operating lease liabilities 17,716 — Total deferred tax assets 81,889 17,124 Valuation allowance (36,353) (877) Total deferred tax assets net of valuation allowance 45,536 16,247 Deferred tax liabilities: Property and equipment (6,744) (4,779) Deferred commissions (21,156) (11,468) Operating right-of-use assets (16,453) — Total deferred tax liabilities (44,353) (16,247) Net deferred tax assets $ 1,183 $ — In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management believes it is more likely than not that the deferred tax assets will not be realized; accordingly, a valuation allowance has been recorded on U.S. and U.K. net deferred tax assets. The valuation allowance increased $35.5 million during the fiscal year ended January 31, 2020 and was primarily attributable to net operating losses generated as a result of stock-based compensation windfall benefits. The valuation allowance decreased $2.3 million during the fiscal year ended January 31, 2019 and was primarily attributable to deferred tax liabilities generated from the capitalization of commissions for GAAP purposes. The valuation allowance decreased $3.1 million during the fiscal year ended January 31, 2018 and was primarily attributable to remeasuring the U.S. net deferred tax assets at the applicable tax rate of 21% in accordance with the TCJA, offset by increases in deferred tax assets primarily related to net operating losses. As of January 31, 2020, we had net operating loss carryforwards of approximately $148.0 million for federal income tax purposes, a portion of which will begin to expire in 2032 if unused. We had net operating loss carryforwards of approximately $88.2 million for state income tax purposes, which will begin to expire in the year 2027 if unused. We also had certain foreign net operating loss carryforwards of $6.8 million, which have an indefinite life. As of January 31, 2020, we also had research and development credit carryforwards of approximately $6.7 million for federal income tax and $5.9 million for state income tax purposes. The federal research and development tax credit will begin to expire in 2036 if unused. State research and development tax credits carry forward indefinitely. The federal and state net operating loss carryforwards may be subject to significant limitations under Section 382 and Section 383 of the Internal Revenue Code of 1986 and similar provisions under state law. The Tax Reform Act of 1986 contains provisions that limit the federal net operating loss carryforwards that may be used in any given year in the event of special occurrences, including significant ownership changes. We have completed a Section 382 review and determined that none of our operating losses will expire solely due to Section 382 limitation(s). We indefinitely reinvest earnings from our foreign subsidiaries and therefore no deferred tax liability has been recognized on the basis difference created by such earnings. We have not provided foreign withholding taxes for any undistributed earnings of our foreign subsidiaries. We comply with ASC 740-10, Accounting for Uncertainty in Income Taxes , which prescribes a comprehensive model for the recognition, measurement, presentation, and disclosure in financial statements of any uncertain tax positions that have been taken or are expected to be taken on a tax return. This pronouncement sets a “more likely than not” criterion for recognizing the tax benefit of uncertain tax positions. Total unrecognized tax benefits are $8.1 million as of January 31, 2020. If recognized, $2.0 million would affect our effective tax rate. A reconciliation of the beginning and ending balance of total unrecognized tax position is as follows: Unrecognized Tax Benefits (in thousands) Balance - January 31, 2017 $ 1,205 Increases related to current years’ tax positions 771 Balance - January 31, 2018 1,976 Increases related to current years’ tax positions 802 Balance - January 31, 2019 2,778 Increases related to current years’ tax positions 5,328 Balance - January 31, 2020 $ 8,106 Our policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. We recognized $0.3 million interest and penalties associated with unrecognized tax benefits during the fiscal year ended January 31, 2020, and we incurred no interest and penalties during the fiscal year ended January 31, 2019. We file income tax returns in the U.S. federal jurisdiction, various state jurisdictions, and various foreign jurisdictions. As of January 31, 2020, all of the years remain open to examination by the federal and state tax authorities, for three or four years from the tax year in which net operating losses or tax credits are utilized. We are currently under Internal Revenue Service (“IRS”) examination for the tax year ended January 31, 2018. We believe that an adequate provision has been made for any adjustments that may result from tax examinations. Although the timing of the resolution, settlement, and closure of audits is not certain, we do not believe it is reasonably possible that our unrecognized tax benefits will materially change in the next 12 months.

Net Income (Loss) Per Share Att

Net Income (Loss) Per Share Attributable to Common Stockholders	12 Months Ended
	Jan. 31, 2020
Earnings Per Share [Abstract]
Net Income (Loss) Per Share Attributable to Common Stockholders	Net Income (Loss) Per Share Attributable to Common Stockholders The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stockholders for the periods presented: Year Ended January 31, 2020 2019 2018 Class A Class B Class A Class B Class A Class B Numerator: (in thousands, except share and per share data) Net income (loss) $ 5,450 $ 19,855 $ — $ 7,584 $ — $ (3,822) Less: distributed earnings attributable to participating securities — — — — — (4,405) Less: undistributed earnings attributable to participating securities — (3,555) — (7,584) — — Net income (loss) attributable to common stockholders, basic $ 5,450 $ 16,300 $ — $ — $ — $ (8,227) Reallocation of net income (loss) attributable to common stockholders (439) 439 — — — — Net income (loss) attributable to common stockholders, diluted $ 5,011 $ 16,739 $ — $ — $ — $ (8,227) Denominator: Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic 58,541,269 175,100,067 — 84,483,094 — 78,119,865 Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted 58,583,874 195,714,140 — 116,005,681 — 78,119,865 Net income (loss) per share attributable to common stockholders, basic $ 0.09 $ 0.09 $ — $ 0.00 $ — $ (0.11) Net income (loss) per share attributable to common stockholders, diluted $ 0.09 $ 0.09 $ — $ 0.00 $ — $ (0.11) The potential shares of common stock that were excluded from the computation of diluted net income (loss) per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive are as follows: Year Ended January 31, 2020 2019 2018 Class A Class B Class A Class B Class A Class B Convertible preferred stock — — — — — 152,665,804 Outstanding stock options 141,782 — — 3,541,878 — 34,170,489 Unvested RSUs 606,971 — — — — — Purchase rights committed under the ESPP 1,180,664 — — — — — Shares subject to repurchase from early exercised stock options and restricted stock — — — — — 2,302,483 Total 1,929,417 — — 3,541,878 — 189,138,776 The table above does not include 500,000 shares of issued Class A common stock held by us and reserved for the sole purpose of being transferred to a nonprofit organization to be formed or identified by us at a future time. The convertible promissory notes are contingently convertible (convertible upon completion of an IPO or a qualified financing event as discussed in Note 6), and the conditions for the convertible feature were not satisfied as of January 31, 2019. For fiscal year ended January 31, 2019, we have excluded these potential dilutive shares from the calculation of diluted net income per share attributable to common stockholders.

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Jan. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Data (Unaudited)	Selected Quarterly Financial Data (Unaudited) Selected summarized quarterly financial information for the fiscal years 2020 and 2019 is as follows: Three Months Ended January 31, 2020 October 31, 2019 July 31, 2019 April 30, 2019 January 31, 2019 October 31, 2018 July 31, 2018 April 30, 2018 (in thousands) Revenue $ 188,251 $ 166,593 $ 145,826 $ 121,988 $ 105,800 $ 90,121 $ 74,526 $ 60,070 Gross profit 155,704 135,748 117,926 97,884 86,275 73,278 61,553 48,410 Income (loss) from operations 10,553 (1,679) 2,265 1,557 5,492 (1,063) 3,422 (1,684) Net income (loss) attributable to common stockholders $ 15,313 $ 2,207 $ 5,521 $ 198 $ 1,196 $ (598) $ 496 $ (1,340) Net income (loss) per share attributable to common stockholders: Basic $ 0.06 $ 0.01 $ 0.02 $ 0.00 $ 0.01 $ (0.01) $ 0.01 $ (0.02) Diluted $ 0.05 $ 0.01 $ 0.02 $ 0.00 $ 0.01 $ (0.01) $ 0.00 $ (0.02)

Subsequent Events

Subsequent Events	12 Months Ended
	Jan. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events We have evaluated subsequent events from the balance sheet date through March 20, 2020, the date at which the consolidated financial statements were available to be issued. Subsequent to January 31, 2020, we entered into an agreement to lease additional space and extend the term of existing leases located in the United States. We expect to make $8.9 million of additional rent payments over the term of these leases, which expires during the year ending January 31, 2030.

Schedule II_ Valuation and Qual

Schedule II: Valuation and Qualifying Accounts	12 Months Ended
	Jan. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II: Valuation and Qualifying Accounts	Schedule II: Valuation and Qualifying Accounts The table below details the activity of the accounts receivable allowances and deferred tax asset valuation allowance for the fiscal years ended January 31, 2020, 2019, and 2018: Balance at Additions Write-offs or Deductions Balance at (in thousands) Year ended January 31, 2020 Accounts receivable allowances $ 2,071 $ 8,583 $ (3,020) $ 7,634 Deferred tax asset valuation allowance 877 35,476 — 36,353 Year ended January 31, 2019 Accounts receivable allowances $ 560 $ 3,763 $ (2,252) $ 2,071 Deferred tax asset valuation allowance 3,154 — (2,277) 877 Year ended January 31, 2018 Accounts receivable allowances $ 922 $ 1,284 $ (1,646) $ 560 Deferred tax asset valuation allowance 6,220 — (3,066) 3,154

Summary of Business and Signi_2

Summary of Business and Significant Accounting Policies (Policies)	12 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with GAAP and include the accounts of Zoom Video Communications, Inc., its subsidiaries, and a variable interest entity (“VIE”) for which we are the primary beneficiary. All intercompany balances and transactions have been eliminated in consolidation.
Variable Interest Entities	Variable Interest Entities In the normal course of business, we may enter into relationships with entities that are deemed to be VIEs. A VIE is a legal entity that satisfies any of the following characteristics: (a) the legal entity does not have sufficient equity investment at risk; (b) the equity investors at risk, as a group, lack the characteristics of a controlling financial interest; or (c) the legal entity is structured with disproportionate voting rights, and substantially all of the activities are conducted on behalf of an investor with disproportionately few voting rights. We consolidate a VIE for which we are the primary beneficiary. The primary beneficiary of a VIE is the party, if any, with both of the following characteristics: (a) the power to direct the activities that most significantly affect the VIE’s economic performance (the “power criterion”) and (b) the obligation to absorb losses or the right to receive residual returns of the VIE that could potentially be significant to the VIE (the “economics criterion”). During fiscal year 2020, a VIE (the “China VIE”) was established and holds the license required to sell our products and services in the People’s Republic of China. However, we are the exclusive provider of technical and consulting services to the China VIE and own all copyrights, patents, technical secrets, trade secrets, and other intellectual properties related to and arising from the operations of the China VIE. Any creditors of the China VIE do not have recourse to our general credit. Through the China VIE agreements, we have the unilateral power to vote all of the shares of the China VIE, set its corporate policies and guidance, and designate the members of its board of directors and management team. We are also entitled to receive all dividends of the China VIE. Because both the power and economics criteria are met, we are the primary beneficiary of and therefore have a controlling financial interest in the China VIE.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and 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. Significant items subject to such estimates and assumptions include, but are not limited to, the estimated expected benefit period for deferred contract acquisition costs, the accounts receivable allowances, the useful lives of long-lived assets, the incremental borrowing rate for operating leases, the valuation of derivative liabilities, the value of common stock and other assumptions used to measure stock-based compensation expense, sales and other tax liabilities, and the valuation of deferred income tax assets and uncertain tax positions. Actual results could differ from those estimates.
Concentration of Risks	Concentration of Risks Our financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities, restricted cash, and accounts receivable. We maintain our cash, cash equivalents, marketable securities, and restricted cash with high-quality financial institutions with investment-grade ratings. A majority of the cash balances are with U.S. banks and are insured to the extent defined by the Federal Deposit Insurance Corporation.
Cash and Cash Equivalents and Restricted Cash	Cash, Cash Equivalents, and Restricted Cash Cash and cash equivalents consist of cash in banks and highly liquid investments, primarily money market funds, purchased with an original maturity of three months or less. Historically, restricted cash consisted of certificates of deposit collateralizing our operating leases and corporate credit cards, and was included in prepaid expenses and other current assets and other assets, noncurrent in the consolidated balance sheets. In the third quarter of fiscal year 2020, we received $48.5 million of cash from proceeds on international employees’ sales of our common stock. The amount is held in our bank account until it is remitted to the employees and the tax authorities. Due to the restrictions on the use of the funds in the bank account, we have classified the amount as restricted cash included in prepaid expenses and other current assets, and a corresponding amount is included in accrued expenses and other current liabilities in the consolidated balance sheets.
Marketable Securities	Marketable Securities Marketable securities consist primarily of high-grade commercial paper, corporate bonds, agency bonds, corporate debt securities, U.S. government agency securities, and treasury bills. We classify our marketable securities as available-for-sale at the time of purchase and reevaluate such classification at each balance sheet date. We may sell these securities at any time for use in current operations even if they have not yet reached maturity. As a result, we classify our securities, including those with maturities beyond 12 months, as current assets in the consolidated balance sheets. We carry these securities at fair value and
Fair Value Measurements	Fair Value Measurements Fair value is defined as the exchange price that would be received from the sale of an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. We measure financial assets and liabilities at fair value at each reporting period using a fair value hierarchy, which requires us to maximize the use of observable inputs and minimize 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 fair value: Level 1—Quoted prices in active markets for identical assets or liabilities. Level 2—Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Financial instruments consist of cash equivalents, restricted cash, marketable securities, accounts receivable, accounts payable, convertible promissory notes, and derivative liabilities. Cash equivalents, restricted cash, marketable securities, and derivative liabilities are stated at fair value on a recurring basis. Accounts receivable and accounts payable are stated at their carrying value, which approximates fair value due to the short time to the expected receipt or payment date. The principal amounts of the convertible promissory notes approximate fair value as the stated interest rates approximate market rates currently available to us.
Accounts Receivable	Accounts ReceivableAccounts receivable are recorded at the invoiced amount and amounts for which revenue has been recognized but not invoiced, net of accounts receivable allowances. The accounts receivable allowances are based on our assessment of the collectability of accounts. We regularly review the adequacy of the accounts receivable allowances based on a combination of factors. In establishing any required allowance, management considers historical losses adjusted to take into account current market conditions and our customers’ financial condition, the amount of any receivables in dispute, the current receivables aging, and the current payment terms. Accounts receivable deemed uncollectible are charged against the accounts receivable allowances when identified.
Property and Equipment, Net	Property and Equipment, Net Property and equipment, net, are stated at cost, less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the respective assets, determined to be three
Leases	Leases All lease arrangements are generally recognized at lease commencement. Operating lease right-of-use (“ROU”) assets and operating lease liabilities are recognized at commencement. For short-term leases (an initial term of 12 months or less), an ROU asset and corresponding lease liability are not recorded and we record rent expense in our consolidated statements of operations on a straight-line basis over the lease term and record variable lease payments as incurred. ROU assets represent our right to use an underlying asset during the reasonably certain lease term, and lease liabilities represent our obligation to make lease payments arising from the lease. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Operating lease ROU assets and liabilities are recognized at the commencement date based on the present value of fixed payments not yet paid over the lease term. We use our incremental borrowing rate based on the information available at the commencement date in determining the lease liabilities as our leases generally do not provide an implicit rate. Our incremental borrowing rate is estimated to approximate the interest rate on a collateralized basis with similar terms and payments, in an economic environment where the leased asset is located. ROU assets also include any initial direct costs incurred and any lease payments made at or before the lease commencement date, less lease incentives received. We reassess the lease term if and when a significant event or change in circumstances occurs within our control. We currently do not have any finance leases.
Impairment of Long-Lived Assets	Impairment of Long-Lived AssetsWe evaluate long-lived assets or asset groups for impairment whenever events indicate that the carrying value of an asset or asset group may not be recoverable based on expected future cash flows attributable to that asset or asset group. Recoverability of assets held and used is measured by comparing the carrying amount of an asset or an asset group to estimated undiscounted future net cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset or asset group exceeds estimated undiscounted future cash flows, then an impairment charge would be recognized based on the excess of the carrying amount of the asset or asset group over its fair value. Assets to be disposed of are reported at the lower of their carrying amount or fair value, less costs to sell.
Revenue Recognition	Revenue Recognition We derive our revenue from subscription agreements with customers for access to our video-first communications platform and services. Revenue is recognized when a customer obtains control of promised services. The amount of revenue recognized reflects the consideration that we expect to receive in exchange for these services. We determine revenue recognition through the following steps: 1. Identification of the contract, or contracts, with the customer We determine a contract with a customer to exist when the contract is approved, each party’s rights regarding the services to be transferred can be identified, the payment terms for the services can be identified, the customer has the ability and intent to pay, and the contract has commercial substance. At contract inception, we will evaluate whether two or more contracts should be combined and accounted for as a single contract and whether the combined or single contract includes more than one performance obligation. We apply judgment in determining the customer’s ability and intent to pay, which is based on a variety of factors, including the customer’s historical payment experience or, in the case of a new customer, credit and financial information pertaining to the customer. 2. Identification of the performance obligations in the contract Performance obligations committed in a contract are identified based on the services that will be transferred to the customer that are both capable of being distinct, whereby the customer can benefit from the service either on its own or together with other resources that are readily available from third parties or from us, and are distinct in the context of the contract, whereby the transfer of the services and the products is separately identifiable from other promises in the contract. Our performance obligations generally consist of access to our video-first communications platform and related support services, which is considered one performance obligation. Our customers do not have the ability to take possession of our software, and through access to our platform, we provide a series of distinct software-based services that are satisfied over the term of the subscription. We also provide services, which include professional services, consulting services, and online event hosting, which are generally considered distinct from the access to our video-first communications platform. 3. Determination of the transaction price The transaction price is determined based on the consideration to which we expect to be entitled in exchange for transferring services to the customer. Variable consideration is included in the transaction price if, in our judgment, it is probable that a significant future reversal of cumulative revenue recognized under the contract will not occur. None of our contracts contain a significant financing component. Revenue is recognized net of any taxes collected from customers, which are subsequently remitted to governmental entities (e.g., sales and other indirect taxes). Our video-first communications platform and related support services are typically warranted to perform in a professional manner that will comply with the terms of the subscription agreements. In addition, we include service-level commitments to our customers warranting certain levels of uptime reliability and performance and permitting those customers to receive credits in the event that we fail to meet those service levels. These credits represent a form of variable consideration. Historically, we have not experienced any significant incidents affecting the defined levels of reliability and performance as required by the subscription agreements. We have not provided any material refunds related to these agreements in the consolidated financial statements during the periods presented. 4. Allocation of the transaction price to the performance obligations in the contract Contracts that contain multiple performance obligations require an allocation of the transaction price to each performance obligation based on each performance obligation’s relative standalone selling price. As noted above, access to our video-first communications platform and related support services are considered one performance obligation in the context of the contract and accordingly the transaction price is allocated to this single performance obligation. 5. Recognition of the revenue when, or as, a performance obligation is satisfied Revenue is recognized at the time the related performance obligation is satisfied by transferring the control of the promised service to a customer. Revenue is recognized in an amount that reflects the consideration that we expect to receive in exchange for those services. Fees for access to our video-first communications platform and related support services are subscription revenue and are considered one performance obligation, and the related revenue is recognized ratably over the subscription period as we satisfy the performance obligation. Professional services are time-based arrangements and revenue is recognized as these services are performed. Fees for services represent less than 2% of total revenue during the periods presented.
Cost of Revenue	Cost of Revenue Cost of revenue primarily consists of costs related to hosting our video-first communications platform and providing general operating support services to our customers. These costs are composed of co-located data center costs, third-party cloud hosting costs, integrated third-party PSTN services, personnel-related expenses, amortization of capitalized software
Research and Development	Research and Development Research and development costs include personnel-related expenses associated with our engineering personnel and consultants responsible for the design, development, and testing of our video-first communications platform, depreciation of equipment used in research and development, and allocated overhead costs. Research and development costs are expensed as incurred.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred in sales and marketing expense and amounted to $42.0 million, $36.1 million, and $17.1 million for the fiscal years ended January 31, 2020, 2019, and 2018, respectively.
Share-Based Compensation	Stock-Based Compensation Stock-based compensation expense related to stock awards (including stock options, restricted stock awards (“RSAs”), RSUs, and ESPP) is measured based on the fair value of the awards granted and recognized as an expense on a straight-line basis over the requisite service period for stock options, RSAs and RSUs, and over the offering period for the purchase rights issued under the ESPP. The fair value of each option and ESPP award is estimated on the grant date using the Black-Scholes option pricing model. The Black-Scholes option pricing model requires the input of highly subjective assumptions, including the fair value of the underlying common stock, the expected term of the award, the expected volatility of the price of our common stock, risk-free interest rates, and the expected dividend yield of our common stock. The fair value of each RSA and RSU award is based on the fair value of the underlying common stock as of the grant date. The assumptions used to determine the fair value of the stock awards represent management’s best estimates. These estimates involve inherent uncertainties and the application of management’s judgment. We account for forfeitures as they occur instead of estimating the number of awards expected to be forfeited.
Foreign Currency	Foreign Currency The functional currency of our foreign subsidiaries is the U.S. dollar. Accordingly, monetary assets and liabilities of our foreign subsidiaries are remeasured into U.S. dollars at the exchange rates in effect at the reporting date, non-monetary assets and liabilities are remeasured at historical rates, and revenue and expenses are remeasured at average exchange rates in effect during each reporting period. Foreign currency related gains and losses have been immaterial during the periods presented.
Income Taxes	Income Taxes We use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. We must then assess the likelihood that the resulting deferred tax assets will be realized. A valuation allowance is provided when it is more likely than not that a deferred tax asset will not be fully realized. Management believes it is more likely than not that deferred tax assets in the United States and the U.K. will not be realized and, accordingly, a valuation allowance has been established on such deferred tax assets. We recognize benefits of uncertain tax positions if it is more likely than not that such positions will be sustained upon examination based solely on their technical merits at the largest amount of benefit that is more likely than not to be realized upon the ultimate settlement. Our policy is to recognize interest and penalties related to the underpayment of income taxes as a component of income tax expense or benefit. The calculation of tax liabilities involves significant judgment in estimating the impact of uncertainties in the application of GAAP and U.S. and foreign tax laws. The resolution of these uncertain tax positions in a manner inconsistent with management’s expectations could have a material impact on our consolidated financial statements.
Net Income (Loss) Per Share Attributable to Common Stockholders	Net Income (Loss) Per Share Attributable to Common Stockholders We calculate our net income (loss) per share attributable to Class A and Class B common stock using the two-class method required for companies with participating securities. We consider our convertible preferred stock and unvested common stock, which includes early exercised stock options and RSAs, to be participating securities as holders of such securities have non-forfeitable dividend rights in the event of our declaration of a dividend for shares of common stock. During the periods when we are in a net loss position, the net loss attributable to common stockholders was not allocated to the convertible preferred stock and unvested common stock under the two-class method as these securities do not have a contractual obligation to share in our losses. Distributed and undistributed earnings allocated to participating securities are subtracted from net income (loss) in determining net income (loss) attributable to common stockholders. Basic net income (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the weighted-average number of shares of our Class A and Class B common stock outstanding. The diluted net income per share attributable to common stockholders is computed by giving effect to all dilutive securities. Diluted net income per share attributable to common stockholders is computed by dividing the resulting net income attributable to common stockholders by the weighted-average number of fully diluted common shares outstanding. During the periods when there is a net loss attributable to common stockholders, potentially dilutive common stock equivalents have been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect is anti-dilutive.
Segment Information	Segment Information We operate in one operating segment. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker, who is our Chief Executive Officer (“CEO”), in deciding how to allocate resources and assessing performance. Our chief operating decision maker allocates resources and assesses performance based upon consolidated financial information.
Recent Accounting Pronouncements Not Yet Adopted and Recently Adopted Accounting Pronouncements	Recent Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which replaces the existing incurred loss impairment model with an expected credit loss model and requires a financial asset measured at amortized cost to be presented at the net amount expected to be collected. The guidance will be effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. We do not expect the adoption to have a material impact on our consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal-use Software (subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract . The amendment aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The guidance will be effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. We are currently evaluating whether the adoption of this standard will have a material impact on our consolidated financial statements. Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) , which supersedes FASB Accounting Standards Codification (“ASC”) Topic 840, Leases (“ASC 840”), and makes other conforming amendments to GAAP. ASU No. 2016-02 requires, among other changes to the lease accounting guidance, lessees to recognize most leases on-balance sheet via an ROU asset and lease liability, and additional qualitative and quantitative disclosures. ASU No. 2016-02 is effective for the annual periods in fiscal years beginning after December 15, 2018, and interim periods therein. We adopted the standard as of February 1, 2019, using the modified retrospective method of applying the new standard at the adoption date. Under this approach, we will continue to report comparative periods presented in the period of adoption under ASC 840. We have elected the package of practical expedients permitted under the transition guidance within the new standard, which allows us to (1) carry forward the historical lease classification, (2) not reassess whether any expired or existing contracts contain leases, and (3) not reassess indirect costs for any existing leases. This election allows us to account for lease components (e.g., fixed payments or variable payments that depend on a rate that can be determined at commencement, including rent for the right to use the asset) together with non-lease components (e.g., other fixed payments that deliver a good or service, including common area maintenance costs) in the calculation of the ROU asset and corresponding liability. Adoption of this standard resulted in the recording of ROU assets and lease liabilities of $40.5 million and $43.0 million, respectively, with no material impact on retained earnings as of February 1, 2019. See Note 7 for further details. In February 2018, the FASB issued ASU No. 2018-02, Compensation—Stock Compensation (Topic 718): Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The standard allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“TCJA”). The standard eliminates the stranded tax effects from the TCJA and improves the usefulness of information reported to users of our consolidated financial statements. ASU No. 2018-02 is effective for the annual periods in fiscal years beginning after December 15, 2018, and interim periods therein. We adopted ASU No. 2018-02 as of February 1, 2019, and our adoption did not have a material impact on the consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemploy ee Share-Based Payment Accounting . The standard simplifies the accounting for share-based payments granted to nonemployees for goods and services and aligns most of the guidance on such payments to nonemployees with the requirements for share-based payments granted to employees. ASU No. 2018-07 is effective for the annual periods in fiscal years beginning after December 15, 2018, and interim periods therein, using a modified retrospective approach. We adopted ASU No. 2018-07 as of February 1, 2019, and our adoption did not have a material impact on the consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement . The standard no longer requires disclosure of the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy; however, public companies will be required to disclose the range and weighted-average of significant unobservable inputs used to develop Level 3 fair value measurements. ASU No. 2018-13 is effective for the annual periods in fiscal years beginning after December 15, 2019, and interim periods therein, with early adoption permitted. We adopted ASU No. 2018-13 as of February 1, 2019, and our adoption did not have a material impact on the consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . The amendment removes certain exceptions to the general principles in Topic 740. The guidance will be effective for fiscal years beginning after December 15, 2020 and interim periods within those fiscal years. Early adoption of the amendments is permitted, including adoption in any interim period for public business entities for periods for which financial statements have not yet been issued. We have adopted ASU No. 2019-12 as of February 1, 2019, and our adoption did not have a material impact on the consolidated financial statements.
Equity Securities without Readily Determinable Fair Value	Equity Investment In the third quarter of fiscal year 2020, we made a $3.0 million strategic investment in a private limited liability company in the business of designing and developing video communications hardware. We do not have a controlling financial interest in the investee nor the ability to exercise significant influence over the operating and financial policies of the investee. The investment is included within other assets, noncurrent in the consolidated balance sheets. Dividend income, unrealized and realized holding gains or losses, and impairment charges would be reported in interest income and other, net in the consolidated statements of operations. The maximum loss we could incur for this investment is its carrying value. We have elected to measure this investment, which does not have a readily determinable fair value, at its cost minus impairment, if any. If we identify observable price changes in orderly transactions for the identical or a similar investment of the same issuer, we will measure the equity security at fair value as of the date that the observable transaction occurred (i.e., using the measurement alternative). At each reporting period, we perform a qualitative assessment considering impairment indicators to evaluate whether the investment is impaired. If this qualitative assessment indicates that the investment is impaired and the fair value of the investment is less than its carrying amount, the investment would be written down to its fair value.
Internal Use Software, Software to be Sold, Leased, or Otherwise Marketed, Policy	Software Development Costs We capitalize certain development costs related to our video-first communications platform during the application development stage. Costs incurred in the preliminary stages of development are analogous to research and development activities and are expensed as incurred. The preliminary stage includes activities such as conceptual formulation of alternatives, evaluation of alternatives, determination of existence of needed technology, and final selection of alternatives. Once the application development stage is reached, internal and external costs are capitalized until the software is substantially complete and ready for its intended use. Capitalized software development costs are recorded as part of property and equipment, net. Maintenance, minor upgrades, and training costs are expensed as incurred. Capitalized software development costs are amortized on a straight-line basis over the software’s estimated useful life, which is generally three years, and are recorded in cost of revenue in the consolidated statements of operations. We have capitalized $3.1 million, $2.5 million, and $0.8 million of software development costs during the fiscal years ended January 31, 2020, 2019, and 2018, respectively.

Summary of Business and Signi_3

Summary of Business and Significant Accounting Policies (Tables)	12 Months Ended
	Jan. 31, 2020
Accounting Policies [Abstract]
Long-lived Assets by Geographic Areas	The following table presents our property and equipment, net of depreciation and amortization, by geographic region: As of January 31, 2020 2019 (in thousands) Americas $ 48,519 $ 26,048 APAC 7,464 8,928 EMEA 1,155 2,299 Total property and equipment, net $ 57,138 $ 37,275

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Jan. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue by Region	The following table summarizes revenue by region based on the billing address of customers: Year Ended January 31, 2020 2019 2018 Amount Percentage of Amount Percentage of Amount Percentage of (in thousands, except percentages) Americas $ 500,622 81 % $ 270,132 82 % $ 125,428 83 % APAC 51,152 8 27,720 8 13,652 9 EMEA 70,884 11 32,665 10 12,398 8 Total $ 622,658 100 % $ 330,517 100 % $ 151,478 100 %
Deferred Contract Acquisition Costs	The following table represents a rollforward of deferred contract acquisition costs: Year Ended January 31, 2020 2019 (in thousands) Beginning balance $ 55,516 $ 30,586 Additions to deferred contract acquisition costs 72,715 45,769 Amortization of deferred contract acquisition costs (37,101) (20,839) Ending balance $ 91,130 $ 55,516 Deferred contract acquisition costs, current (to be amortized in next 12 months) $ 44,885 $ 26,453 Deferred contract acquisition costs, noncurrent 46,245 29,063 Total deferred contract acquisition costs $ 91,130 $ 55,516

Marketable Securities (Tables)

Marketable Securities (Tables)	12 Months Ended
	Jan. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Summary of Marketable Securities	As of January 31, 2020 and 2019, our marketable securities consisted of the following: As of January 31, 2020 Amortized Gross Gross Estimated (in thousands) Commercial paper $ 37,894 $ — $ — $ 37,894 Agency bonds 141,157 49 (43) 141,163 Corporate and other debt securities 320,407 775 (16) 321,166 U.S. government agency securities 71,794 45 (2) 71,837 Marketable securities $ 571,252 $ 869 $ (61) $ 572,060 As of January 31, 2019 Amortized Gross Gross Estimated (in thousands) Commercial paper $ 1,243 $ — $ — $ 1,243 Corporate bonds 53,267 — (53) 53,214 Agency bonds 32,675 — (71) 32,604 U.S. government agency securities 24,028 — (11) 24,017 Treasury bills 1,699 — — 1,699 Marketable securities $ 112,912 $ — $ (135) $ 112,777
Summary of Contractual Maturities of Marketable Securities	The following table presents the contractual maturities of our marketable securities as of January 31, 2020 and 2019: As of January 31, 2020 2019 (in thousands) Less than one year $ 315,900 $ 85,077 Due in one to five years 256,160 27,700 Total $ 572,060 $ 112,777

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Jan. 31, 2020
Fair Value Disclosures [Abstract]
Schedule of Financial Instruments Measured at Fair Value on Recurring Basis	The following tables present information about our financial instruments that are measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value: As of January 31, 2020 Fair Value Level 1 Level 2 Level 3 (in thousands) Financial Assets: Money market funds $ 96,486 $ 96,486 $ — $ — Commercial paper 4,994 — 4,994 — Agency bonds 9,999 — 9,999 — Cash equivalents 111,479 96,486 14,993 — Commercial paper 37,894 — 37,894 — Agency bonds 141,163 — 141,163 — Corporate and other debt securities 321,166 — 321,166 — U.S. government agency securities 71,837 — 71,837 — Marketable securities 572,060 — 572,060 — Certificate of deposit included in prepaid expenses and other current assets 100 — 100 — Certificates of deposit included in other assets, noncurrent 2,301 — 2,301 — Total financial assets $ 685,940 $ 96,486 $ 589,454 $ — As of January 31, 2019 Fair Value Level 1 Level 2 Level 3 (in thousands) Financial Assets: Money market funds $ 78 $ 78 $ — $ — Cash equivalents 78 78 — — Commercial paper 1,243 — 1,243 — Corporate bonds 53,214 — 53,214 — Agency bonds 32,604 — 32,604 — U.S. government agency securities 24,017 — 24,017 — Treasury bills 1,699 — 1,699 — Marketable securities 112,777 — 112,777 — Certificate of deposit included in prepaid expenses and other current assets 200 — 200 — Certificates of deposit included in other assets, noncurrent 2,144 — 2,144 — Total financial assets $ 115,199 $ 78 $ 115,121 $ — Financial Liabilities: Convertible promissory notes – derivative liabilities included in other liabilities, noncurrent $ 163 $ — $ — $ 163 Total financial liabilities $ 163 $ — $ — $ 163

Balance Sheet Components (Table

Balance Sheet Components (Tables)	12 Months Ended
	Jan. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure	Prepaid expenses and other current assets consisted of the following: As of January 31, 2020 2019 (in thousands) Restricted cash from international employee stock sales $ 48,547 $ — Prepaid expenses 22,320 9,263 Other 4,141 989 Prepaid expenses and other current assets $ 75,008 $ 10,252
Schedule of Property and Equipment	Property and equipment consisted of the following: As of January 31, 2020 2019 (in thousands) Computer and office equipment $ 51,375 $ 32,515 Leasehold improvements 18,215 7,660 Software 10,855 6,575 Furniture and fixtures 3,949 1,993 Property and equipment, gross 84,394 48,743 Less: accumulated depreciation and amortization (27,256) (11,468) Property and equipment, net $ 57,138 $ 37,275
Schedule of Other Assets, Noncurrent	Other assets, noncurrent consisted of the following: As of January 31, 2020 2019 (in thousands) Accounts receivable, noncurrent $ 9,011 $ 3,264 Equity investment 3,000 — Other 10,321 8,244 Other assets, noncurrent $ 22,332 $ 11,508
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following: As of January 31, 2020 2019 (in thousands) Liabilities to employees and tax authorities from international employee stock sales $ 49,287 $ — Accrued compensation and benefits 36,732 12,004 Accrued expenses 17,475 13,596 Operating lease liabilities, current 7,675 — Other 11,523 6,656 Accrued expenses and other current liabilities $ 122,692 $ 32,256
Schedule of Other Liabilities, Noncurrent	Other liabilities, noncurrent consisted of the following: As of January 31, 2020 2019 (in thousands) Sales and other tax liabilities $ 33,957 $ 20,817 Convertible promissory notes, net of debt discount — 14,858 Other 2,329 3,785 Other liabilities, noncurrent $ 36,286 $ 39,460

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Jan. 31, 2020
Leases [Abstract]
Schedule of Supplemental Balance Sheet Information	Supplemental balance sheet information as of January 31, 2020, related to operating leases was as follows: As of January 31, 2020 (in thousands) Reported as: Assets: Operating lease right-of-use assets $ 68,608 Liabilities: Accrued expenses and other current liabilities $ 7,675 Operating lease liabilities, noncurrent 64,792 Total operating lease liabilities $ 72,467
Supplemental Cash Flow and Other Information	Supplemental cash flow and other information for the fiscal year ended January 31, 2020, related to operating leases was as follows: Year Ended (in thousands) Cash payments included in the measurement of our operating lease liabilities $ 9,774 Operating lease right-of-use assets recognized in exchange for new operating lease obligations $ 34,993
Schedule of Future Minimum Lease Payments included in Measurement of Operating Lease Liabilities	As of January 31, 2020, the future minimum lease payments included in the measurement of our operating lease liabilities are as follows: As of January 31, 2020 (in thousands) Year Ending January 31, 2021 $ 11,170 2022 12,191 2023 12,177 2024 11,541 2025 11,348 Thereafter 29,383 Total operating lease payments $ 87,810 Less: imputed interest (15,343) Total operating lease liabilities $ 72,467
Schedule of Future Minimum Payments Related to Operating Leases	As previously disclosed in Note 6. “Commitments and Contingencies” to Notes to Consolidated Financial Statements in our Prospectus and under the previous lease accounting standard, future minimum payments related to operating leases as of January 31, 2019 are as follows: As of January 31, 2019 (in thousands) Year Ending January 31, 2020 $ 7,609 2021 7,837 2022 7,888 2023 7,514 2024 7,174 Thereafter 18,635 Total future minimum payments $ 56,657

Convertible Preferred Stock, _2

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan (Tables)	12 Months Ended
	Jan. 31, 2020
Equity [Abstract]
Schedule of Stock by Class	Convertible preferred stock consisted of the following as of January 31, 2019 and as of immediately prior to the automatic conversion of convertible preferred stock into common stock: As of January 31, 2019 Designated Shares Issued Aggregate (in thousands, except share data) Series A 67,083,500 61,717,700 $ 9,258 Series B 25,857,784 25,857,784 6,500 Series C 34,363,256 34,363,256 30,000 Series D 30,800,000 30,727,064 114,966 Total convertible preferred stock 158,104,540 152,665,804 $ 160,724
Schedule of Stock by Class Reserved for Future Issuance	We have the following shares of common stock reserved for future issuance: As of January 31, 2020 2019 Conversion of convertible preferred stock — 152,665,804 Stock options outstanding 16,833,009 35,064,465 RSUs outstanding 1,964,668 — ESPP purchase rights outstanding 1,323,662 — Remaining shares available for future issuance under the 2011 and 2019 plan 33,604,587 1,848,100 Remaining shares available for future issuance under the ESPP 7,186,070 — Total shares of common stock reserved 60,911,996 189,578,369
Summary of Stock Option Activity Under Equity Incentive Plan	A summary of stock option activity under our equity incentive plan and related information is as follows: Stock Options Outstanding Weighted- Weighted- Aggregate (in thousands, except share, life and per share data) Balance as of January 31, 2019 35,064,465 $ 1.48 6.8 $ 534,572 Granted 1,576,150 $ 36.86 Exercised (19,003,652) $ 0.49 $ 767,336 Canceled/forfeited/expired (803,954) $ 5.15 Balance as of January 31, 2020 16,833,009 $ 5.73 7.6 $ 1,191,881 Vested and exercisable as of January 31, 2020 7,248,393 $ 1.78 6.8 $ 540,222
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The Black-Scholes assumptions used to value the employee options at the grant dates are as follows: Year Ended January 31, 2020 2019 2018 Expected term (years) 5.0 - 6.1 5.0 - 6.2 5.6 - 6.7 Expected volatility 49.9% - 53.2% 44.6% - 48.2% 47.7% - 52.0% Risk-free interest rate 1.6% - 2.5% 2.6% - 3.1% 1.8% - 2.3% Expected dividend yield — — —
Summary of Restricted Stock Units (RSUs) Activity Under Equity Incentive Plan	A summary of RSU activity under our equity incentive plan and related information is as follows: RSUs Unvested Weighted-Average Unvested as of January 31, 2019 — $ — Granted 2,048,248 $ 79.22 Vested (31,649) $ 78.23 Canceled/forfeited (51,931) $ 84.00 Unvested as of January 31, 2020 1,964,668 $ 79.11
Summary of Assumptions for Estimating Fair Value of ESPP Purchase Rights	We estimated the fair value of ESPP purchase rights using a Black-Scholes option-pricing model with the following assumptions: Year Ended Expected term (years) 0.5 - 2.1 Expected volatility 40.3% - 56.2% Risk-free interest rate 1.5% - 2.5% Expected dividend yield —
Summary of Stock-based Compensation Expense by Line Item	The stock-based compensation expense by line item in the accompanying consolidated statements of operations is summarized as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Cost of revenue $ 7,860 $ 1,119 $ 204 Research and development 11,645 1,369 360 Sales and marketing 41,465 3,540 812 General and administrative 12,139 2,913 8,953 Total stock-based compensation expense $ 73,109 $ 8,941 $ 10,329

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Components of the Net Income (Loss) before Provision of Income Taxes	The components of the net income (loss) before the provision for income taxes were as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Domestic $ 16,268 $ (204) $ (3,782) Foreign 10,094 8,553 264 Total $ 26,362 $ 8,349 $ (3,518)
Provision of Income Taxes	The provision for income taxes was as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Current: Federal $ — $ — $ — State 14 80 46 Foreign 2,226 685 258 Total current income tax expense 2,240 765 304 Deferred: Federal — — — State — — — Foreign (1,183) — — Total deferred income tax expense (1,183) — — Total provision for income taxes $ 1,057 $ 765 $ 304
Provision for Income Taxes	The provision for income taxes differs from the amount computed by applying the statutory federal tax rate as follows: Year Ended January 31, 2020 2019 2018 (in thousands) Tax at federal statutory rate $ 5,536 $ 1,764 $ (1,157) State taxes 14 67 45 Foreign rate differential (2,096) (1,627) (26) Stock-based compensation (32,070) 1,662 3,272 Permanent items 1,009 809 117 Research and development credits (2,808) (289) (150) Tax uncertainties 1,019 515 516 Change in valuation allowance 30,932 (1,438) (1,537) Change in federal tax rate — — (881) Other (479) (698) 105 Total $ 1,057 $ 765 $ 304 Effective tax rate 4.0 % 9.2 % (8.6) %
Significant Components of Deferred Income Tax Assets	Significant components of our deferred income tax assets as of January 31, 2020 and 2019 are as follows: As of January 31, 2020 2019 (in thousands) Deferred tax assets: Net operating loss carryforwards $ 37,507 $ 6,517 Research and development credit carryforwards 5,701 972 Stock-based compensation 4,145 133 Accruals and reserves 11,586 6,856 Deferred revenue 5,234 2,646 Operating lease liabilities 17,716 — Total deferred tax assets 81,889 17,124 Valuation allowance (36,353) (877) Total deferred tax assets net of valuation allowance 45,536 16,247 Deferred tax liabilities: Property and equipment (6,744) (4,779) Deferred commissions (21,156) (11,468) Operating right-of-use assets (16,453) — Total deferred tax liabilities (44,353) (16,247) Net deferred tax assets $ 1,183 $ —
Reconciliation of Unrecognized Tax Position	A reconciliation of the beginning and ending balance of total unrecognized tax position is as follows: Unrecognized Tax Benefits (in thousands) Balance - January 31, 2017 $ 1,205 Increases related to current years’ tax positions 771 Balance - January 31, 2018 1,976 Increases related to current years’ tax positions 802 Balance - January 31, 2019 2,778 Increases related to current years’ tax positions 5,328 Balance - January 31, 2020 $ 8,106

Net Income (Loss) Per Share A_2

Net Income (Loss) Per Share Attributable to Common Stockholders (Tables)	12 Months Ended
	Jan. 31, 2020
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share	The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stockholders for the periods presented: Year Ended January 31, 2020 2019 2018 Class A Class B Class A Class B Class A Class B Numerator: (in thousands, except share and per share data) Net income (loss) $ 5,450 $ 19,855 $ — $ 7,584 $ — $ (3,822) Less: distributed earnings attributable to participating securities — — — — — (4,405) Less: undistributed earnings attributable to participating securities — (3,555) — (7,584) — — Net income (loss) attributable to common stockholders, basic $ 5,450 $ 16,300 $ — $ — $ — $ (8,227) Reallocation of net income (loss) attributable to common stockholders (439) 439 — — — — Net income (loss) attributable to common stockholders, diluted $ 5,011 $ 16,739 $ — $ — $ — $ (8,227) Denominator: Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic 58,541,269 175,100,067 — 84,483,094 — 78,119,865 Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted 58,583,874 195,714,140 — 116,005,681 — 78,119,865 Net income (loss) per share attributable to common stockholders, basic $ 0.09 $ 0.09 $ — $ 0.00 $ — $ (0.11) Net income (loss) per share attributable to common stockholders, diluted $ 0.09 $ 0.09 $ — $ 0.00 $ — $ (0.11)
Summary of Potential Shares of Common Stock Excluded from Computation of Diluted Net Income Per Share Attributable to Common Stockholders	The potential shares of common stock that were excluded from the computation of diluted net income (loss) per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive are as follows: Year Ended January 31, 2020 2019 2018 Class A Class B Class A Class B Class A Class B Convertible preferred stock — — — — — 152,665,804 Outstanding stock options 141,782 — — 3,541,878 — 34,170,489 Unvested RSUs 606,971 — — — — — Purchase rights committed under the ESPP 1,180,664 — — — — — Shares subject to repurchase from early exercised stock options and restricted stock — — — — — 2,302,483 Total 1,929,417 — — 3,541,878 — 189,138,776

Selected Quarterly Financial _2

Selected Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Jan. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	Selected summarized quarterly financial information for the fiscal years 2020 and 2019 is as follows: Three Months Ended January 31, 2020 October 31, 2019 July 31, 2019 April 30, 2019 January 31, 2019 October 31, 2018 July 31, 2018 April 30, 2018 (in thousands) Revenue $ 188,251 $ 166,593 $ 145,826 $ 121,988 $ 105,800 $ 90,121 $ 74,526 $ 60,070 Gross profit 155,704 135,748 117,926 97,884 86,275 73,278 61,553 48,410 Income (loss) from operations 10,553 (1,679) 2,265 1,557 5,492 (1,063) 3,422 (1,684) Net income (loss) attributable to common stockholders $ 15,313 $ 2,207 $ 5,521 $ 198 $ 1,196 $ (598) $ 496 $ (1,340) Net income (loss) per share attributable to common stockholders: Basic $ 0.06 $ 0.01 $ 0.02 $ 0.00 $ 0.01 $ (0.01) $ 0.01 $ (0.02) Diluted $ 0.05 $ 0.01 $ 0.02 $ 0.00 $ 0.01 $ (0.01) $ 0.00 $ (0.02)

Summary of Business and Signi_4

Summary of Business and Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Thousands	Apr. 30, 2019USD ($)	Apr. 23, 2019USD ($)$ / sharesshares	Apr. 18, 2019USD ($)$ / sharesshares	Jan. 31, 2019USD ($)shares	Jan. 31, 2018	Oct. 31, 2019USD ($)	Jan. 31, 2020USD ($)vote	Jan. 31, 2019USD ($)	Jan. 31, 2018USD ($)	Feb. 01, 2019USD ($)
Summary Of Business And Significant Accounting Policies [Line Items]
Stockholders' equity note, stock split, conversion ratio					4
Stockholders' equity note, stock split, conversion ratio, shares (in shares) | shares				4
Sales and marketing							$ 340,646	$ 185,821	$ 82,707
Proceeds from international employee stock sales to be remitted to employees and tax authorities						$ 48,500	48,547	0	0
Purchase of equity investment						$ 3,000	3,000	0	0
Equity investment				$ 0			3,000	0
Advertising expense							$ 42,000	36,100	17,100
Number of operating segments | vote							1
Operating lease, total ROU assets							$ 68,608
Operating lease, total liabilities							$ 72,467
Revenue from Contract with Customer | Professional Services Fees Concentration Risk
Summary Of Business And Significant Accounting Policies [Line Items]
Percentage of revenue							2.00%
Minimum
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life							3 years
Maximum
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life							5 years
Convertible Debt
Summary Of Business And Significant Accounting Policies [Line Items]
Share price per share (in dollars per share) | $ / shares		$ 36
Leasehold Improvements | Maximum
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life							5 years
Software
Summary Of Business And Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life							3 years
Property, plant and equipment, additions							$ 3,100	2,500	$ 800
Accounting Standards Update 2016-02
Summary Of Business And Significant Accounting Policies [Line Items]
Operating lease, total ROU assets										$ 40,500
Operating lease, total liabilities										$ 43,000
Other Assets, Non-current
Summary Of Business And Significant Accounting Policies [Line Items]
Capitalized deferred offering costs within other assets, non-current				$ 2,400				$ 2,400
Class A Common Stock | Convertible Debt
Summary Of Business And Significant Accounting Policies [Line Items]
Share price per share (in dollars per share) | $ / shares		$ 36
Over-Allotment Option
Summary Of Business And Significant Accounting Policies [Line Items]
Deferred offering costs, reclassified to stockholders' equity	$ (6,400)
Over-Allotment Option | Class A Common Stock
Summary Of Business And Significant Accounting Policies [Line Items]
Shares issued (in shares) | shares		9,911,434	3,130,435
Shares issued, price per share (in dollars per share) | $ / shares		$ 36	$ 36
Net proceeds from shares issued		$ 340,800	$ 107,100
Initial public offering | Class A Common Stock
Summary Of Business And Significant Accounting Policies [Line Items]
Convertible securities converted to common stock (in shares) | shares		426,223
Initial public offering | Class B Common Stock
Summary Of Business And Significant Accounting Policies [Line Items]
Convertible securities converted to common stock (in shares) | shares		152,665,804
Private Placement | Class A Common Stock
Summary Of Business And Significant Accounting Policies [Line Items]
Shares issued (in shares) | shares		2,777,777
Share price per share (in dollars per share) | $ / shares		$ 36
Aggregate proceeds from shares issued		$ 100,000

Summary of Business and Signi_5

Summary of Business and Significant Accounting Policies - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 57,138	$ 37,275
Americas
Property, Plant and Equipment [Line Items]
Property and equipment, net	48,519	26,048
APAC
Property, Plant and Equipment [Line Items]
Property and equipment, net	7,464	8,928
EMEA
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 1,155	$ 2,299

Revenue Recognition - Summary D

Revenue Recognition - Summary Disaggregation of Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 188,251	$ 166,593	$ 145,826	$ 121,988	$ 105,800	$ 90,121	$ 74,526	$ 60,070	$ 622,658	$ 330,517	$ 151,478
Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									100.00%	100.00%	100.00%
Americas
Disaggregation of Revenue [Line Items]
Revenue									$ 500,622	$ 270,132	$ 125,428
Americas | Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									81.00%	82.00%	83.00%
APAC
Disaggregation of Revenue [Line Items]
Revenue									$ 51,152	$ 27,720	$ 13,652
APAC | Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									8.00%	8.00%	9.00%
EMEA
Disaggregation of Revenue [Line Items]
Revenue									$ 70,884	$ 32,665	$ 12,398
EMEA | Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									11.00%	10.00%	8.00%

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Revenue from Contract with Customer [Abstract]
Unbilled accounts receivable	$ 12.5	$ 7.2
Revenue recognized included in deferred revenue	$ 119.1	$ 50.3	$ 21.3
Capitalized contract cost, amortization period	3 years

Revenue Recognition - Remaining

Revenue Recognition - Remaining Performance Obligation (Details) $ in Millions	Jan. 31, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 604.1
Billed consideration
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	230.5
Unbilled consideration
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 373.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-02-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation percentage	62.00%
Revenue remaining performance obligation, expected timing of satisfaction period	12 months

Revenue Recognition - Deferred

Revenue Recognition - Deferred Contract Acquisition Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2020	Jan. 31, 2019
Capitalized Contract Cost, Net
Beginning balance	$ 55,516	$ 30,586
Additions to deferred contract acquisition costs	72,715	45,769
Amortization of deferred contract acquisition costs	(37,101)	(20,839)	$ (9,023)
Ending balance	91,130	55,516	30,586
Deferred contract acquisition costs, current				$ 44,885	$ 26,453
Deferred contract acquisition costs, noncurrent				46,245	29,063
Total deferred contract acquisition costs	$ 91,130	$ 55,516	$ 30,586	$ 91,130	$ 55,516

Marketable Securities - Summary

Marketable Securities - Summary Marketable Securities (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Marketable Securities [Line Items]
Amortized Cost	$ 571,252	$ 112,912
Gross Unrealized Gains	869	0
Gross Unrealized Losses	(61)	(135)
Estimated Fair Value	572,060	112,777
Commercial paper
Marketable Securities [Line Items]
Amortized Cost	37,894	1,243
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	37,894	1,243
Corporate bonds
Marketable Securities [Line Items]
Amortized Cost		53,267
Gross Unrealized Gains		0
Gross Unrealized Losses		(53)
Estimated Fair Value		53,214
Agency bonds
Marketable Securities [Line Items]
Amortized Cost	141,157	32,675
Gross Unrealized Gains	49	0
Gross Unrealized Losses	(43)	(71)
Estimated Fair Value	141,163	32,604
Corporate and other debt securities
Marketable Securities [Line Items]
Amortized Cost	320,407
Gross Unrealized Gains	775
Gross Unrealized Losses	(16)
Estimated Fair Value	321,166
U.S. government agency securities
Marketable Securities [Line Items]
Amortized Cost	71,794	24,028
Gross Unrealized Gains	45	0
Gross Unrealized Losses	(2)	(11)
Estimated Fair Value	$ 71,837	24,017
Treasury bills
Marketable Securities [Line Items]
Amortized Cost		1,699
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 1,699

Marketable Securities - Additio

Marketable Securities - Additional Information (Details) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Debt Securities, Available-for-sale, Realized Gain (Loss)	$ 0	$ 0	$ 0

Marketable Securities - Summa_2

Marketable Securities - Summary of Contractual Maturities of Marketable Securities (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Less than one year	$ 315,900	$ 85,077
Due in one to five years	256,160	27,700
Total	$ 572,060	$ 112,777

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Financial Assets:
Marketable securities	$ 572,060	$ 112,777
Commercial paper
Financial Assets:
Marketable securities	37,894	1,243
Corporate bonds
Financial Assets:
Marketable securities		53,214
Agency bonds
Financial Assets:
Marketable securities	141,163	32,604
Corporate and other debt securities
Financial Assets:
Marketable securities	321,166
U.S. government agency securities
Financial Assets:
Marketable securities	71,837	24,017
Treasury bills
Financial Assets:
Marketable securities		1,699
Fair Value, Recurring Basis
Financial Assets:
Cash equivalents	111,479	78
Marketable securities	572,060	112,777
Total financial assets		115,199
Financial Liabilities:
Convertible promissory notes – derivative liabilities included in other liabilities, noncurrent		163
Total financial liabilities		163
Fair Value, Recurring Basis | Commercial paper
Financial Assets:
Marketable securities	37,894	1,243
Fair Value, Recurring Basis | Corporate bonds
Financial Assets:
Marketable securities		53,214
Fair Value, Recurring Basis | Agency bonds
Financial Assets:
Marketable securities	141,163	32,604
Fair Value, Recurring Basis | Corporate and other debt securities
Financial Assets:
Marketable securities	321,166
Fair Value, Recurring Basis | U.S. government agency securities
Financial Assets:
Marketable securities	71,837	24,017
Fair Value, Recurring Basis | Treasury bills
Financial Assets:
Marketable securities		1,699
Fair Value, Recurring Basis | Certificates of deposit
Financial Assets:
Certificate of deposit included in prepaid expenses and other current and noncurrent assets	100	200
Other assets, noncurrent	2,301	2,144
Total financial assets	685,940
Fair Value, Recurring Basis | Money market funds
Financial Assets:
Cash equivalents	96,486	78
Fair Value, Recurring Basis | Commercial paper
Financial Assets:
Cash equivalents	4,994
Fair Value, Recurring Basis | Agency bonds
Financial Assets:
Cash equivalents	9,999
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1
Financial Assets:
Cash equivalents	96,486	78
Marketable securities	0	0
Total financial assets	96,486	78
Financial Liabilities:
Convertible promissory notes – derivative liabilities included in other liabilities, noncurrent		0
Total financial liabilities		0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Commercial paper
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Corporate bonds
Financial Assets:
Marketable securities		0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Agency bonds
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Corporate and other debt securities
Financial Assets:
Marketable securities	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | U.S. government agency securities
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Treasury bills
Financial Assets:
Marketable securities		0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Certificates of deposit
Financial Assets:
Certificate of deposit included in prepaid expenses and other current and noncurrent assets	0	0
Other assets, noncurrent	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Money market funds
Financial Assets:
Cash equivalents	96,486	78
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Commercial paper
Financial Assets:
Cash equivalents	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 1 | Agency bonds
Financial Assets:
Cash equivalents	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2
Financial Assets:
Cash equivalents	14,993	0
Marketable securities	572,060	112,777
Total financial assets	589,454	115,121
Financial Liabilities:
Convertible promissory notes – derivative liabilities included in other liabilities, noncurrent		0
Total financial liabilities		0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper
Financial Assets:
Marketable securities	37,894	1,243
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Corporate bonds
Financial Assets:
Marketable securities		53,214
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Agency bonds
Financial Assets:
Marketable securities	141,163	32,604
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Corporate and other debt securities
Financial Assets:
Marketable securities	321,166
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | U.S. government agency securities
Financial Assets:
Marketable securities	71,837	24,017
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Treasury bills
Financial Assets:
Marketable securities		1,699
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Certificates of deposit
Financial Assets:
Certificate of deposit included in prepaid expenses and other current and noncurrent assets	100	200
Other assets, noncurrent	2,301	2,144
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Money market funds
Financial Assets:
Cash equivalents	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Commercial paper
Financial Assets:
Cash equivalents	4,994
Fair Value, Recurring Basis | Fair Value, Inputs, Level 2 | Agency bonds
Financial Assets:
Cash equivalents	9,999
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3
Financial Assets:
Cash equivalents	0	0
Marketable securities	0	0
Total financial assets	0	0
Financial Liabilities:
Convertible promissory notes – derivative liabilities included in other liabilities, noncurrent		163
Total financial liabilities		163
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Commercial paper
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Corporate bonds
Financial Assets:
Marketable securities		0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Agency bonds
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Corporate and other debt securities
Financial Assets:
Marketable securities	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | U.S. government agency securities
Financial Assets:
Marketable securities	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Treasury bills
Financial Assets:
Marketable securities		0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Certificates of deposit
Financial Assets:
Certificate of deposit included in prepaid expenses and other current and noncurrent assets	0	0
Other assets, noncurrent	0	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Money market funds
Financial Assets:
Cash equivalents	0	$ 0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Commercial paper
Financial Assets:
Cash equivalents	0
Fair Value, Recurring Basis | Fair Value, Inputs, Level 3 | Agency bonds
Financial Assets:
Cash equivalents	$ 0

Balance Sheet Components - Prep

Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Restricted cash from international employee stock sales	$ 48,547	$ 0
Prepaid expenses	22,320	9,263
Other	4,141	989
Prepaid expenses and other current assets	$ 75,008	$ 10,252

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 84,394	$ 48,743
Less: accumulated depreciation and amortization	(27,256)	(11,468)
Property and equipment, net	57,138	37,275
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51,375	32,515
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	18,215	7,660
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,855	6,575
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,949	$ 1,993

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Depreciation and amortization	$ 16,449	$ 7,008	$ 2,786

Balance Sheet Components - Othe

Balance Sheet Components - Other Assets, Noncurrent (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable, noncurrent	$ 9,011	$ 3,264
Equity investment	3,000	0
Other	10,321	8,244
Other assets, noncurrent	$ 22,332	$ 11,508

Balance Sheet Components - Sc_2

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]
Liabilities to employees and tax authorities from international employee stock sales	$ 49,287	$ 0
Accrued compensation and benefits	36,732	12,004
Accrued expenses	17,475	13,596
Operating lease liabilities, current	7,675	0
Other	11,523	6,656
Accrued expenses and other current liabilities	$ 122,692	$ 32,256

Balance Sheet Components - Sc_3

Balance Sheet Components - Schedule of Other Liabilities Non Current (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrual for taxes other than income taxes, noncurrent	$ 33,957	$ 20,817
Convertible promissory notes, net of debt discount	0	14,858
Other	2,329	3,785
Other liabilities, noncurrent	$ 36,286	$ 39,460

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Purchase obligation	$ 86,100
Accrual for taxes other than income taxes	37,700	$ 22,000
Accrual for taxes other than income taxes, current	3,700	1,200
Accrual for taxes other than income taxes, noncurrent	$ 33,957	$ 20,817

Convertible Promissory Notes -

Convertible Promissory Notes - Additional Information (Details) - USD ($)	Apr. 23, 2019	Oct. 31, 2018	Jan. 31, 2020
Convertible Debt
Debt Instrument [Line Items]
Debt instrument term		3 years
Share price per share (in dollars per share)	$ 36
Loss on derivative instruments, pretax			$ 200,000
Write off of deferred debt issuance cost			$ 100,000
Class A Common Stock | Convertible Debt
Debt Instrument [Line Items]
Share price per share (in dollars per share)	$ 36
Class A Common Stock | Initial public offering
Debt Instrument [Line Items]
Conversion of convertible preferred stock to common stock upon initial public offering (in shares)	426,223
Dropbox | Convertible Debt
Debt Instrument [Line Items]
Debt instrument face amount		$ 5,000,000
Interest rate percentage		2.75%
Atlassian | Convertible Debt
Debt Instrument [Line Items]
Debt instrument face amount		$ 10,000,000
Interest rate percentage		5.00%

Operating Leases - Additional I

Operating Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Jan. 31, 2020USD ($)lease	Jan. 31, 2019USD ($)	Jan. 31, 2018USD ($)
Lessee, Lease, Description [Line Items]
Number of operating lease options | lease	1
Operating lease, expense	$ 9.7
Weighted-average remaining lease term	7 years 6 months
Weighted-average discount rate	5.10%
Operating lease expense		$ 7.2
Rent expense			$ 3.3
Maximum
Lessee, Lease, Description [Line Items]
Lease contractual period	10 years

Operating Leases - Schedule of

Operating Leases - Schedule of Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Assets
Operating lease right-of-use assets	$ 68,608
Liabilities:
Accrued expenses and other current liabilities	7,675	$ 0
Operating lease liabilities, noncurrent	64,792
Total operating lease liabilities	$ 72,467

Operating Leases - Schedule o_2

Operating Leases - Schedule of Supplemental Cash flow Information (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2020USD ($)
Leases [Abstract]
Cash payments included in the measurement of our operating lease liabilities	$ 9,774
Operating lease right-of-use assets recognized in exchange for new operating lease obligations	$ 34,993

Operating Leases - Schedule o_3

Operating Leases - Schedule of Future Minimum Lease Payments included in Measurement of Operating Lease Liabilities (Details) $ in Thousands	Jan. 31, 2020USD ($)
Operating Leases Future Minimum Lease Payments [Abstract]
2021	$ 11,170
2022	12,191
2023	12,177
2024	11,541
2025	11,348
Thereafter	29,383
Total operating lease payments	87,810
Less: imputed interest	(15,343)
Total operating lease liabilities	$ 72,467

Operating Leases - Schedule o_4

Operating Leases - Schedule of Future Minimum Payments Related to Operating Leases (Details) $ in Thousands	Jan. 31, 2019USD ($)
Leases [Abstract]
2020	$ 7,609
2021	7,837
2022	7,888
2023	7,514
2024	7,174
Thereafter	18,635
Total future minimum payments	$ 56,657

Convertible Preferred Stock, _3

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Schedule of Stock by Class (Details) - USD ($)	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)	0	158,104,540
Convertible preferred stock, shares issued (in shares)	0	152,665,804
Convertible preferred stock, shares outstanding (in shares)	0	152,665,804	152,665,804	154,031,604
Convertible preferred stock, aggregate liquidation preference		$ 160,724
Series A Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)		67,083,500
Convertible preferred stock, shares issued (in shares)		61,717,700
Convertible preferred stock, shares outstanding (in shares)		61,717,700
Convertible preferred stock, aggregate liquidation preference		$ 9,258
Series B Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)		25,857,784
Convertible preferred stock, shares issued (in shares)		25,857,784
Convertible preferred stock, shares outstanding (in shares)		25,857,784
Convertible preferred stock, aggregate liquidation preference		$ 6,500
Series C Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)		34,363,256
Convertible preferred stock, shares issued (in shares)		34,363,256
Convertible preferred stock, shares outstanding (in shares)		34,363,256
Convertible preferred stock, aggregate liquidation preference		$ 30,000
Series D Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares authorized (in shares)		30,800,000
Convertible preferred stock, shares issued (in shares)		30,727,064
Convertible preferred stock, shares outstanding (in shares)		30,727,064
Convertible preferred stock, aggregate liquidation preference		$ 114,966

Convertible Preferred Stock, _4

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Additional Information (Details)	1 Months Ended		12 Months Ended
	Apr. 30, 2019USD ($)voteshares	May 31, 2017USD ($)$ / sharesshares	Jan. 31, 2020USD ($)$ / sharesshares	Jan. 31, 2019USD ($)$ / sharesshares	Jan. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2011	Apr. 23, 2019USD ($)$ / sharesshares	Nov. 30, 2018vote$ / sharesshares	Jan. 31, 2017USD ($)shares
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding (in shares)			0	152,665,804	152,665,804				154,031,604
Conversion of convertible preferred stock to common stock upon initial public offering | $			$ 0	$ 159,552,000	$ 159,552,000				$ 159,757,000
Convertible preferred stock, shares issued (in shares)			0	152,665,804
Undesignated preferred stock shares authorized (in shares)			200,000,000	0
Undesignated referred stock par value (in dollars per share) | $ / shares			$ 0.001	$ 0.001
Temporary equity repurchased during period (in shares)					1,365,800
Repurchase of Series A convertible preferred stock | $					$ (205,000)
Common stock, conversion features, term			6 months
Initial offering period			15 years
Common stock, par value (in dollars per share) | $ / shares			$ 0.001	$ 0.001
Stock options outstanding (in shares)			16,833,009	35,064,465
Weighted average grant date fair value of options for employees (in dollars per share) | $ / shares			$ 25.17	$ 6.28	$ 0.67
Expected unrecognized stock-based compensation expenses related to outstanding unvested stock options | $			$ 76,600,000
Number of shares available for future issuance (in shares)			60,911,996	189,578,369
Number of purchase periods | vote	4
Proceeds for unvested shares of common stock | $			$ 1,200,000	$ 1,800,000
Stock-based compensation expense | $			73,109,000	$ 8,941,000	$ 10,329,000
RSUs
Class of Stock [Line Items]
Unrecognized stock-based compensation expenses | $			$ 142,800,000
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period			3 years 7 months 6 days
Number of shares available for future issuance (in shares)			1,964,668	0
Purchase rights committed under the ESPP
Class of Stock [Line Items]
Unrecognized stock-based compensation expenses | $			$ 55,700,000
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period			1 year 4 months 24 days
Number of shares available for future issuance (in shares)			1,323,662	0
Payroll deductions to participate in plan	20.00%
Maximum number of shares per employee (in shares)	3,000
Consecutive offering period	27 months
Stock options
Class of Stock [Line Items]
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period			2 years 9 months 18 days
Number of shares available for future issuance (in shares)			16,833,009	35,064,465
2011 Plan
Class of Stock [Line Items]
Vesting period of awards						4 years
Term of 2019 stock plan						5 years
Number of shares authorized (in shares)				71,240,000
Stock plan rate						10.00%
2011 Plan | Maximum
Class of Stock [Line Items]
Term of 2019 stock plan						10 years
2019 Plan
Class of Stock [Line Items]
Shares reserved for issuance, percentage	5.00%
2019 Plan | Maximum
Class of Stock [Line Items]
Term of 2019 stock plan			10 years
2019 Employee Stock Purchase Plan | Purchase rights committed under the ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)			7,186,070	0
Percent of outstanding stock, maximum	1.00%
Number of additional shares allowable under the plan (in shares)	7,500,000
Share-based Compensation Arrangement By Share-based Payment Award, Percentage Voting Power Excluded From Participating In Plan			5.00%
Initial public offering
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding (in shares)							152,665,804
Conversion of convertible preferred stock to common stock upon initial public offering | $							$ 159,600,000
Undesignated preferred stock shares authorized (in shares)							200,000,000
Undesignated referred stock par value (in dollars per share) | $ / shares							$ 0.001
Third-Party Stock Transaction | Chief Executive Officer
Class of Stock [Line Items]
Shares issued, price per share (in dollars per share) | $ / shares		$ 3.74
Stock-based compensation expense | $		$ 8,600,000
Shares issued (in shares)		2,899,136
Series A Preferred Stock
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding (in shares)				61,717,700
Convertible preferred stock, shares issued (in shares)				61,717,700
Temporary equity repurchased during period (in shares)					1,365,800
Repurchase of Series A convertible preferred stock | $					$ 4,600,000
Class A Common Stock
Class of Stock [Line Items]
Common stock number of votes per share | vote								1
Common stock, shares issued (in shares)			123,391,114	0
Common stock, shares authorized (in shares)			2,000,000,000	320,000,000				320,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001					$ 0.001
Class A Common Stock | Purchase rights committed under the ESPP
Class of Stock [Line Items]
Percentage of purchase price of common stock to fair market value of common stock on offering or purchase date	85.00%
ESPP excess rate purchase right, value | $	$ 25,000
Shares issued of common stock (in shares)			490,268
Class A Common Stock | 2011 Plan
Class of Stock [Line Items]
Other shares authorized (in shares)	24,300,889
Class A Common Stock | 2019 Plan
Class of Stock [Line Items]
Number of shares authorized (in shares)	58,300,889
Number of additional shares authorized under the plan (in shares)	34,000,000
Class A Common Stock | 2019 Employee Stock Purchase Plan | Purchase rights committed under the ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	9,000,000
Class B Common Stock
Class of Stock [Line Items]
Common stock number of votes per share | vote								10
Common stock, shares issued (in shares)			155,336,747
Common stock, shares authorized (in shares)			300,000,000	300,000,000				300,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001					$ 0.001
Number of common stock subject to repurchase (in shares)			466,819	1,261,230
Common stock subject to repurchase or cancellation (in dollars per share) | $ / shares			$ 2.58
Weighted average price per share (in dollars per share) | $ / shares			$ 1.41
Class B Common Stock | 2011 Plan
Class of Stock [Line Items]
Stock options outstanding (in shares)				35,064,465
Number of shares available for grant (in shares)				1,848,100

Convertible Preferred Stock, _5

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Schedule of Stock by Class Reserved for Future Issuance (Details) - shares	Jan. 31, 2020	Jan. 31, 2019
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	60,911,996	189,578,369
Convertible preferred stock
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	0	152,665,804
Stock options
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	16,833,009	35,064,465
RSUs
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	1,964,668	0
ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	1,323,662	0
2011 and 2019 Plan
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	33,604,587	1,848,100
2019 Employee Stock Purchase Plan | ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	7,186,070	0

Convertible Preferred Stock, _6

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Summary of Stock Option Activity Under Equity Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Outstanding Stock Options
Beginning balance (in shares)	35,064,465
Granted (in shares)	1,576,150
Exercised (in shares)	(19,003,652)
Cancelled/forfeited/expired (in shares)	(803,954)
Ending balance (in shares)	16,833,009	35,064,465
Outstanding stock options, vested (in shares)	7,248,393
Weighted- Average Exercise Price
Beginning balance (in dollars per share)	$ 1.48
Granted (in dollars per share)	36.86
Exercised (in dollars per share)	0.49
Cancelled/forfeited/expired (in dollars per share)	5.15
Ending balance (in dollars per share)	5.73	$ 1.48
Weighted average exercise price, vested and exercisable (in shares)	$ 1.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual life (years)	7 years 7 months 6 days	6 years 9 months 18 days
Weighted-average remaining contractual life, vested and exercisable	6 years 9 months 18 days
Aggregate intrinsic value	$ 1,191,881	$ 534,572
Aggregate intrinsic value, exercised	767,336	$ 60,800	$ 2,500
Aggregate intrinsic value, vested and exercisable	$ 540,222

Convertible Preferred Stock, _7

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Schedule of Assumptions for Employee Options at Grant Dates (Details) - Stock options	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	49.90%	44.60%	47.70%
Expected volatility, maximum	53.20%	48.20%	52.00%
Risk-free interest rate, minimum	1.60%	2.60%	1.80%
Risk-free interest rate, maximum	2.50%	3.10%	2.30%
Expected dividend yield	0.00%	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	5 years	5 years	5 years 7 months 6 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	6 years 1 month 6 days	6 years 2 months 12 days	6 years 8 months 12 days

Convertible Preferred Stock, _8

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Summary of Restricted Stock Units Activity Under Equity Incentive Plan (Details) - RSUs	12 Months Ended
	Jan. 31, 2020$ / sharesshares
Unvested RSUs
Beginning balance (in units) | shares	0
Granted (in units) | shares	2,048,248
Vested (in units) | shares	(31,649)
Cancelled/forfeited (in units) | shares	(51,931)
Ending balance (in units) | shares	1,964,668
Weighted-Average Grant Date Fair Value Per Share
Beginning balance (in dollars per unit) | $ / shares	$ 0
Granted (in dollars per unit) | $ / shares	79.22
Vested (in dollars per unit) | $ / shares	78.23
Cancelled/forfeited (in dollars per unit) | $ / shares	84
Ending balance (in dollars per unit) | $ / shares	$ 79.11

Convertible Preferred Stock, _9

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Fair Value of ESPP Purchase Rights Assumptions (Details) - Purchase rights committed under the ESPP	3 Months Ended	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, minimum	40.30%
Expected volatility, maximum	56.20%
Risk-free interest rate, minimum	1.50%
Risk-free interest rate, maximum	2.50%
Expected dividend yield		0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	6 months
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	2 years 1 month 6 days

Convertible Preferred Stock,_10

Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Summary of Stock-based Compensation Expense by Line Item (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, Compensation Cost [Line Items]
Stock-based compensation expense	$ 73,109	$ 8,941	$ 10,329
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	7,860	1,119	204
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	11,645	1,369	360
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	41,465	3,540	812
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 12,139	$ 2,913	$ 8,953

Income Taxes - Components of th

Income Taxes - Components of the Net Income (Loss) before Provision of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 16,268	$ (204)	$ (3,782)
Foreign	10,094	8,553	264
Total	$ 26,362	$ 8,349	$ (3,518)

Income Taxes - Schedule of Curr

Income Taxes - Schedule of Current and Deferred Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Current:
Federal	$ 0	$ 0	$ 0
State	14	80	46
Foreign	2,226	685	258
Total current income tax expense	2,240	765	304
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	(1,183)	0	0
Deferred income tax expense (benefit), total	(1,183)	0	0
Total provision for income taxes	$ 1,057	$ 765	$ 304

Income Taxes - Provision for In

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 5,536	$ 1,764	$ (1,157)
State taxes	14	67	45
Foreign rate differential	(2,096)	(1,627)	(26)
Stock-based compensation	(32,070)	1,662	3,272
Permanent items	1,009	809	117
Research and development credits	(2,808)	(289)	(150)
Tax uncertainties	1,019	515	516
Change in valuation allowance	30,932	(1,438)	(1,537)
Change in federal tax rate	0	0	(881)
Other	(479)	(698)	105
Total provision for income taxes	$ 1,057	$ 765	$ 304
Effective tax rate	4.00%	9.20%	(8.60%)

Income Taxes - Significant Comp

Income Taxes - Significant Components of Deferred Income Tax Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Deferred Tax Assets, Net [Abstract]
Net operating loss carryforwards	$ 37,507	$ 6,517
Research and development credit carryforwards	5,701	972
Stock-based compensation	4,145	133
Accruals and reserves	11,586	6,856
Deferred revenue	5,234	2,646
Operating lease liabilities	17,716	0
Total deferred tax assets net of valuation allowance	81,889	17,124
Valuation allowance	(36,353)	(877)
Total deferred tax assets net of valuation allowance	45,536	16,247
Deferred Tax Liabilities, Net [Abstract]
Property and equipment	(6,744)	(4,779)
Deferred commissions	(21,156)	(11,468)
Operating right-of-use assets	(16,453)	0
Total deferred tax liabilities	(44,353)	(16,247)
Net deferred tax assets	$ 1,183	$ 0

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Tax Credit Carryforward [Line Items]
Increase (decrease) of valuation allowance	$ 35,500,000	$ (2,300,000)	$ (3,100,000)
Unrecognized tax benefits	8,106,000	2,778,000	$ 1,976,000	$ 1,205,000
Unrecognized tax benefits, if recognized, would impact effective tax rate	2,000,000
Interest and penalties	300,000	$ 0
Federal Income Tax
Tax Credit Carryforward [Line Items]
Operating loss carryforward	148,000,000
Federal Income Tax | Research and Development Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward	6,700,000
State Income Tax
Tax Credit Carryforward [Line Items]
Operating loss carryforward	88,200,000
State Income Tax | Research and Development Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward	5,900,000
Foreign Tax
Tax Credit Carryforward [Line Items]
Operating loss carryforward	$ 6,800,000

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Unrecognized Tax Position (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]
Beginning Balance	$ 2,778	$ 1,976	$ 1,205
Increases related to current years’ tax positions	5,328	802	771
Ending Balance	$ 8,106	$ 2,778	$ 1,976

Net Income (Loss) Per Share A_3

Net Income (Loss) Per Share Attributable to Common Stockholders - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Earnings Per Share, Basic [Abstract]
Net income (loss)									$ 25,305	$ 7,584	$ (3,822)
Distributed Earnings									0	0	4,405
Less: undistributed earnings attributable to participating securities									3,555	7,584	0
Net income (loss) attributable to common stockholders	$ 15,313	$ 2,207	$ 5,521	$ 198	$ 1,196	$ (598)	$ 496	$ (1,340)	$ 21,750	$ 0	$ (8,227)
Earnings Per Share, Diluted [Abstract]
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic (in shares)									233,641,336	84,483,094	78,119,865
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted (in shares)									254,298,014	116,005,681	78,119,865
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)	$ 0.06	$ 0.01	$ 0.02	$ 0	$ 0.01	$ (0.01)	$ 0.01	$ (0.02)	$ 0.09	$ 0	$ (0.11)
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)	$ 0.05	$ 0.01	$ 0.02	$ 0	$ 0.01	$ (0.01)	$ 0	$ (0.02)	$ 0.09	$ 0	$ (0.11)
Class A Common Stock
Earnings Per Share, Basic [Abstract]
Net income (loss)									$ 5,450	$ 0	$ 0
Distributed Earnings									0	0	0
Less: undistributed earnings attributable to participating securities									0	0	0
Net income (loss) attributable to common stockholders									5,450	0	0
Reallocation of net income (loss) attributable to common stockholders									(439)	0	0
Net income (loss) attributable to common stockholders, diluted									$ 5,011	$ 0	$ 0
Earnings Per Share, Diluted [Abstract]
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic (in shares)									58,541,269	0	0
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted (in shares)									58,583,874	0	0
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)									$ 0.09	$ 0	$ 0
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)									$ 0.09	$ 0	$ 0
Class B Common Stock
Earnings Per Share, Basic [Abstract]
Net income (loss)									$ 19,855	$ 7,584	$ (3,822)
Distributed Earnings									0	0	4,405
Less: undistributed earnings attributable to participating securities									3,555	7,584	0
Net income (loss) attributable to common stockholders									16,300	0	(8,227)
Reallocation of net income (loss) attributable to common stockholders									439	0	0
Net income (loss) attributable to common stockholders, diluted									$ 16,739	$ 0	$ (8,227)
Earnings Per Share, Diluted [Abstract]
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, basic (in shares)									175,100,067	84,483,094	78,119,865
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders, diluted (in shares)									195,714,140	116,005,681	78,119,865
Net income (loss) per share attributable to common stockholders, basic (in dollars per share)									$ 0.09	$ 0	$ (0.11)
Net income (loss) per share attributable to common stockholders, diluted (in dollars per share)									$ 0.09	$ 0	$ (0.11)

Net Income (Loss) Per Share A_4

Net Income (Loss) Per Share Attributable to Common Stockholders - Summary of Potential Shares of Common Stock Excluded from Computation of Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Details) - shares	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Class A Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	1,929,417	0	0
Issuance of common stock reserved for charitable donation (in shares)	500,000
Class A Common Stock | Convertible preferred stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	0	0	0
Class A Common Stock | Outstanding stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	141,782	0	0
Class A Common Stock | Unvested RSUs
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	606,971	0	0
Class A Common Stock | Purchase rights committed under the ESPP
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	1,180,664	0	0
Class A Common Stock | Shares subject to repurchase from early exercised stock options and restricted stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	0	0	0
Class B Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	0	3,541,878	189,138,776
Class B Common Stock | Convertible preferred stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	0	0	152,665,804
Class B Common Stock | Outstanding stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	0	3,541,878	34,170,489
Class B Common Stock | Unvested RSUs
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)		0	0
Class B Common Stock | Purchase rights committed under the ESPP
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)		0	0
Class B Common Stock | Shares subject to repurchase from early exercised stock options and restricted stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share (in shares)	0	0	2,302,483

Selected Quarterly Financial _3

Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 188,251	$ 166,593	$ 145,826	$ 121,988	$ 105,800	$ 90,121	$ 74,526	$ 60,070	$ 622,658	$ 330,517	$ 151,478
Gross profit	155,704	135,748	117,926	97,884	86,275	73,278	61,553	48,410	507,262	269,516	120,698
Income (loss) from operations	10,553	(1,679)	2,265	1,557	5,492	(1,063)	3,422	(1,684)	12,696	6,167	(4,833)
Net income (loss) attributable to common stockholders	$ 15,313	$ 2,207	$ 5,521	$ 198	$ 1,196	$ (598)	$ 496	$ (1,340)	$ 21,750	$ 0	$ (8,227)
Net income (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.06	$ 0.01	$ 0.02	$ 0	$ 0.01	$ (0.01)	$ 0.01	$ (0.02)	$ 0.09	$ 0	$ (0.11)
Diluted (in dollars per share)	$ 0.05	$ 0.01	$ 0.02	$ 0	$ 0.01	$ (0.01)	$ 0	$ (0.02)	$ 0.09	$ 0	$ (0.11)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	Mar. 20, 2020	Jan. 31, 2020
Subsequent Event [Line Items]
Operating lease payments, due		$ 87,810
Subsequent Event
Subsequent Event [Line Items]
Operating lease payments, due	$ 8,900

Schedule II_ Valuation and Qu_2

Schedule II: Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Accounts receivable allowances
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 2,071	$ 560	$ 922
Additions	8,583	3,763	1,284
Write-offs or Deductions	(3,020)	(2,252)	(1,646)
Balance at End of Year	7,634	2,071	560
Deferred tax asset valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	877	3,154	6,220
Additions	35,476	0	0
Write-offs or Deductions	0	(2,277)	(3,066)
Balance at End of Year	$ 36,353	$ 877	$ 3,154

Uncategorized Items - zm-202001

Label	Element	Value
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	$ 675,000
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	2,301,000
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	2,144,000
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	200,000
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	48,647,000
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	$ 0