Zuora (ZUO) 10-Q 13 Dec 18 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Oct. 31, 2018	Nov. 30, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q3
Trading Symbol	ZUO
Entity Registrant Name	ZUORA INC
Entity Central Index Key	1,423,774
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Class A common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		73,181,559
Class B common stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		35,321,041

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 77,883	$ 48,208
Short-term investments	97,034	0
Accounts receivable, net of allowance for doubtful accounts of $4,170 and $3,292 as of October 31, 2018 and January 31, 2018, respectively	51,379	49,764
Restricted cash, current portion	4,350	0
Prepaid expenses and other current assets	9,195	9,302
Total current assets	239,841	107,274
Property and equipment, net	18,388	10,204
Restricted cash, net of current portion	2,084	5,155
Purchased intangibles, net	9,545	11,292
Goodwill	20,861	20,614
Other assets	2,524	827
Total assets	293,243	155,366
Current liabilities:
Accounts payable	2,678	2,572
Accrued expenses and other current liabilities	13,484	24,496
Accrued employee liabilities	24,516	17,701
Lease obligation, current portion	2,287	1,066
Debt, current portion	1,852	2,917
Deferred revenue, current portion	76,313	66,058
Total current liabilities	121,130	114,810
Debt, net of current portion	11,530	12,052
Deferred revenue, net of current portion	795	346
Lease obligation, net of current portion	0	324
Other long-term liabilities	3,194	1,168
Total liabilities	136,649	128,700
Commitments and contingencies
Stockholders’ equity:
Convertible preferred stock	0	6
Additional paid-in capital	472,093	286,152
Related party receivable	0	(1,281)
Accumulated comprehensive income	98	471
Accumulated deficit	(315,608)	(258,685)
Total stockholders’ equity	156,594	26,666
Total liabilities and stockholders’ equity	293,243	155,366
Class A common stock
Stockholders’ equity:
Common stock	7	0
Class B common stock
Stockholders’ equity:
Common stock	$ 4	$ 3

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,170	$ 3,292

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Revenue:
Subscription	$ 44,485	$ 31,007	$ 122,069	$ 85,859
Professional services	17,152	15,352	49,066	32,251
Total revenue	61,637	46,359	171,135	118,110
Cost of revenue:
Subscription	10,987	8,195	31,273	22,301
Professional services	19,190	13,912	53,569	33,238
Total cost of revenue	30,177	22,107	84,842	55,539
Gross profit	31,460	24,252	86,293	62,571
Operating expenses:
Research and development	14,282	9,977	39,667	27,622
Sales and marketing	25,896	18,625	74,162	52,056
General and administrative	9,579	5,560	27,553	15,790
Total operating expenses	49,757	34,162	141,382	95,468
Loss from operations	(18,297)	(9,910)	(55,089)	(32,897)
Interest and other income (expense), net	633	(421)	(1,218)	(30)
Loss before income taxes	(17,664)	(10,331)	(56,307)	(32,927)
Income tax provision	(225)	(34)	(616)	(405)
Net loss	(17,889)	(10,365)	(56,923)	(33,332)
Comprehensive loss:
Foreign currency translation adjustment	(681)	73	(341)	394
Unrealized loss on available-for-sale securities	(32)	0	(32)	0
Comprehensive loss	$ (18,602)	$ (10,292)	$ (57,296)	$ (32,938)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.17)	$ (0.35)	$ (0.66)	$ (1.27)
Weighted-average shares outstanding used in calculating net loss per share attributable to common stockholders, basic and diluted (in shares)	106,049	29,314	85,820	26,145

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Cash flows from operating activities:
Net loss	$ (56,923)	$ (33,332)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	6,628	5,016
Stock-based compensation	17,722	5,995
Loss on disposal of assets	144	0
Provision for doubtful accounts	4,518	2,764
Accretion of discount on short-term investments	(76)	0
Changes in operating assets and liabilities:
Accounts receivable	(6,133)	(9,198)
Prepaid expenses and other current assets	(2,226)	(107)
Other assets	(1,697)	(567)
Accounts payable	26	(3,070)
Accrued expenses and other current liabilities	2,926	3,626
Accrued employee liabilities	6,815	3,228
Deferred revenue	10,704	7,876
Other long-term liabilities	980	(108)
Net cash used in operating activities	(16,592)	(17,877)
Cash flows from investing activities:
Purchases of property and equipment	(10,621)	(2,480)
Purchases of short-term investments	(97,118)	0
Business combination, net of cash acquired	(247)	(11,420)
Net cash used in investing activities	(107,986)	(13,900)
Cash flows from financing activities:
Payments under capital leases	(1,336)	(1,426)
Proceeds from issuance of common stock upon exercise of stock options	9,026	2,631
Payments of offering costs	(4,399)	(35)
Proceeds from initial public offering, net of underwriters’ discounts and commissions	164,703	0
Payments under related party notes receivable	(4,344)	0
Repayments of related party notes receivable	5,625	0
Repurchases of unvested common stock	(10)	0
Principal payments on long-term debt	(834)	0
Payments related to business combination	(12,558)	0
Proceeds from long-term debt, net of issuance costs	0	14,949
Net cash provided by financing activities	155,873	16,119
Effect of exchange rates on cash and cash equivalents and restricted cash	(341)	394
Net increase (decrease) in cash and cash equivalents and restricted cash	30,954	(15,264)
Cash and cash equivalents and restricted cash, beginning of period	53,363	77,882
Cash and cash equivalents and restricted cash, end of period	84,317	62,618
Supplemental disclosure of non-cash investing and financing activities:
Property and equipment acquired under capital leases	2,392	488
Lapse in restrictions on early exercised common stock options	228	426
Property and equipment purchases accrued or in accounts payable	367	64
Deferred offering costs payable or accrued but not paid	210	247
Accrued acquisition-related payments	0	12,558
Reconciliation of cash and cash equivalents and restricted cash within the condensed consolidated balance sheets to the amounts shown in the condensed consolidated statements of cash flows above:
Cash and cash equivalents	77,883	57,462
Restricted cash, current	4,350	0
Restricted cash, net of current portion	$ 2,084	$ 5,156

Overview and Basis of Presentat

Overview and Basis of Presentation	9 Months Ended
	Oct. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Overview and Basis of Presentation	Overview and Basis of Presentation Description of Business Zuora, Inc. was incorporated in the state of Delaware in 2006 and began operations in 2007. Zuora’s fiscal year ends on January 31. Zuora is headquartered in San Mateo, California. The Company provides cloud-based software on a subscription basis that enables any company in any industry to successfully launch, manage, and transform into a subscription business. Architected specifically for dynamic, recurring subscription business models, Zuora functions as an intelligent hub that automates and orchestrates the entire subscription order-to-cash process. The Company’s cloud-based software solution is the new system of record for subscription businesses. References to Zuora, “Company”, “our”, or “we” in these notes refer to Zuora, Inc. and its subsidiaries on a consolidated basis. Initial Public Offering In April 2018, the Company completed an initial public offering (IPO), in which the Company issued and sold an aggregate of 12.7 million shares of its newly authorized Class A common stock at a price to the public of $14.00 per share. The shares sold included 1.7 million shares pursuant to the exercise by the underwriters of an option to purchase additional shares at a price of $14.00 per share less underwriting discounts and commissions. The Company received aggregate net proceeds of $162.2 million from the IPO after deducting underwriting discounts and commissions and payments of offering costs as of April 30, 2018. Prior to the completion of the IPO, all shares of common stock then outstanding were reclassified as Class B common stock, and all shares of convertible preferred stock outstanding immediately prior to the IPO were converted into 62.0 million shares of Class B common stock on a one-to-one basis. As of October 31, 2018 , 72.6 million shares of the Company’s Class A common stock and 35.8 million shares of Class B common stock were outstanding. Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States (U.S. GAAP) and applicable rules and regulations of the Securities and Exchange Commission (SEC) regarding interim financial reporting. All intercompany balances and transactions have been eliminated in consolidation. The unaudited condensed consolidated balance sheet as of January 31, 2018 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including certain notes required by U.S. GAAP on an annual reporting basis. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the balance sheet, statements of comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2019 or any future period. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s final prospectus dated April 11, 2018 (Prospectus) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended. Use of Estimates The preparation of consolidated financial statements in conformity with generally accepted accounting principles requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities at the date of the consolidated financial statements, as well as reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from those estimates. The Company’s most significant estimates and assumptions are related to revenue recognition with respect to the determination of the relative selling prices for the Company’s services; determination of the fair value of the Company’s common stock for valuation of the Company’s stock-based awards issued prior to the completion of the IPO; valuation of the Company’s stock-based awards; estimates of allowance for doubtful accounts; estimates of the fair value of goodwill, intangible assets and other long-lived assets; and the valuation of deferred income tax assets and contingencies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ materially from these estimates under different assumptions or conditions.

Summary of Significant Accounti

Summary of Significant Accounting Policies and Recent Accounting Pronouncements	9 Months Ended
	Oct. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies and Recent Accounting Pronouncements	Summary of Significant Accounting Policies and Recent Accounting Pronouncements The Company’s significant accounting policies are discussed in “Index to Consolidated Financial Statements—Note 1. Summary of Business and Significant Accounting Policies” in the Prospectus. There have been no significant changes to these policies during the nine months ended October 31, 2018 , except as noted below. Short-term Investments The Company typically invests in high quality, investment grade securities from diverse issuers. The Company classifies its short-term investments as available-for-sale. In general, these investments are free of trading restrictions. The Company carries these investments at fair value, based on quoted market prices or other readily available market information. Unrealized gains and losses, net of taxes, are included in accumulated other comprehensive income, which is reflected as a separate component of stockholders’ equity in the Company’s consolidated balance sheets. Gains and losses are recognized when realized in the Company's consolidated statements of comprehensive loss. When the Company has determined that an other-than-temporary decline in fair value has occurred, the amount of the decline that is related to a credit loss is recognized in income. Gains and losses are determined using the specific identification method. The Company reviews its debt securities classified as short-term investments on a regular basis to evaluate whether or not any security has experienced an other-than-temporary decline in fair value. The Company considers factors such as the length of time and extent to which the market value has been less than the cost, the financial condition and near-term prospects of the issuer and our intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s amortized cost basis. If the Company believes that an other-than-temporary decline exists in one of these securities, it will write down these investments to fair value. The portion of the write-down related to credit loss would be recorded to interest and other income (expense), net in our consolidated statements of comprehensive loss. Any portion not related to credit loss would be recorded to accumulated other comprehensive income, which is reflected as a separate component of stockholders' equity in our consolidated balance sheets. The Company may sell its short-term investments at any time, without significant penalty, for use in current operations or for other purposes, even if they have not yet reached maturity. As a result, the Company has classified its investments, including any securities with maturities beyond 12 months, as current assets in the accompanying unaudited condensed consolidated balance sheet as of October 31, 2018 . Securities with original or remaining maturities of three months or less on the purchase date are considered to be cash equivalents and are reflected in cash and cash equivalents in the accompanying unaudited condensed consolidated balance sheet as of October 31, 2018 . Stock-Based Compensation All stock-based compensation to employees, including the purchase rights issued under the Company’s 2018 Employee Stock Purchase Plan (ESPP), is based on the fair value of the awards on the date of grant. This fair value is recognized as an expense following the straight-line attribution method over the requisite service period of the entire award for stock options, restricted stock units (RSUs) and restricted stock; and over the offering period for the purchase rights issued under the ESPP. The Company uses the Black-Scholes option pricing model to measure the fair value of its stock options and the purchase rights issued under the ESPP. The fair value of the RSUs and restricted stock is determined using the fair value of the Company’s Class A common stock on the date of grant. Prior to the IPO, the fair value of the Company’s common stock was determined by the estimated fair value of the Company’s common stock at the time of grant. After the IPO, the Company uses the closing market price of its Class A common stock on the date of grant for the fair value. Stock-based compensation expense is recorded net of estimated forfeitures in the Company’s consolidated statements of comprehensive loss. Recent Accounting Pronouncements—Not Yet Adopted The Jumpstart Our Business Startups Act (JOBS Act) allows the Company, as an “emerging growth company,” to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. The adoption dates discussed below reflect this election. In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) and has modified the standard thereafter. These standards replace existing revenue recognition rules with a comprehensive revenue measurement and recognition standard and expanded disclosure requirements. ASU 2014-09, as amended, became effective for public companies for the fiscal year beginning after December 15, 2017 and interim periods within that year. Private companies have an additional year to adopt the standard. The two permitted transition methods under the new standard are the full retrospective method, under which ASU 2014-09 would be applied to each prior reporting period presented and the cumulative effect of applying the standard would be recognized at the earliest period shown, or the modified retrospective method, under which the cumulative effect of applying ASU 2014-09 would be recognized at the date of initial application. The Company plans to adopt the new revenue standard when it becomes effective for the Company for the fiscal year ending January 31, 2020 (i.e., effective February 1, 2019). The Company is currently in the process of determining what method of adoption it plans to use. The Company is currently assessing the effect the guidance will have on its condensed consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01 (Subtopic 825-10), Financial Instruments—Overall: Recognition and Measurement of Financial Assets and Financial Liabilities, which primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. ASU 2016-01 is effective for fiscal years beginning after December 15, 2018, and interim periods in fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company has not yet adopted ASU 2016-01 and is currently evaluating the impact of adoption on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842)—Leases, which supersedes the guidance in topic ASC 840, Leases. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases (Topic 842): Targeted Improvements. ASU 2018-10 clarifies certain areas within ASU 2016-02. ASU 2018-11 allows entities an additional transition method to the existing requirements whereby an entity could adopt the provisions of ASU 2016-02 by recognizing a cumulative-effect adjustment to the op ening balance of retained earnings in the period of adoption without adjustment to the financial statements for periods prior to adoption. ASU 2018-11 also allows a practical expedient that permits lessors to not separate non-lease component s from the associated lease component if certain conditions are present. ASU 2016-02, ASU2018-10 and ASU 2018-11 (collectively, Topic 842) will be effective for fiscal years beginning after December 15, 2019 and interim periods within fiscal years beginning after December 15, 2020. Early adoption is permitted. The Company has not yet adopted Topic 842 and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Under existing U.S. GAAP, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of income tax expense in the period in which the law was enacted. When deferred tax balances related to items originally recorded in accumulated other comprehensive income are adjusted, certain tax effects become stranded in accumulated other comprehensive income. The amendments in ASU 2018-02 allow a reclassification from accumulated other comprehensive income to retained earnings (accumulated deficit) for stranded income tax effects resulting from the Tax Cuts and Jobs Act (the Tax Act). The amendments in this ASU also require certain disclosures about stranded income tax effects. The guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption in any period is permitted. The Company’s provisional adjustments recorded in the fiscal year ended January 31, 2018 to account for the impact of the Tax Act did not result in stranded tax effects. The Company has not yet adopted ASU 2018-02 and does not expect the adoption to have a significant impact on its consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718) Improvements to Nonemployee Share-Based Payment Accounting. The guidance expands the scope of the topic to include share-based payments granted to non-employees in exchange for goods or services. Upon adoption, the fair value of awards granted to non-employees will be determined as of the grant date, which will be recognized over the service period. Previous guidance required the awards to be remeasured at fair value periodically when determining the related expense. ASU 2018-07 is effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. Early adoption is permitted, but no earlier than an entity’s adoption date of Topic 606. The Company has not yet adopted ASU 2018-07 and does not expect the adoption to have a significant impact on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement, which amends ASC 820, 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, but public companies will be required to disclose the range and weighted-average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU 2018-13 is effective for interim and annual periods beginning after December 15, 2019 and early adoption is permitted. The Company has not yet adopted ASU 2018-13 and does not expect the adoption to have a significant impact on its consolidated financial statements. In August 2018, the FASB issued ASU 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. This standard 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. The standard is effective for annual periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021, with early adoption permitted. The Company has not yet adopted ASU 2018-15 and does not expect the adoption to have a significant impact on its consolidated financial statements. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that have become redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. The final rule is effective November 5, 2018. We expect to present this analysis beginning with our Quarterly Report on Form 10-Q for the three months ending April 30, 2019. Recent Accounting Pronouncements—Adopted The Company adopted ASU No. 2016-09 (Topic 718), Improvements to Employee Share-Based Payments Accounting, effective February 1, 2018. The Company elected to continue to estimate its forfeiture rate. The adoption of this standard did not have an effect on the statement of cash flows. In November 2016, the FASB issued ASU No. 2016-18 (Topic 230), Statement of Cash Flows, Restricted Cash, which amends the guidance in ASC 230 Statement of Cash Flows and requires that entities show the changes in total of cash, cash equivalents, restricted cash, and restricted cash equivalents in their statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. On February 1, 2018, the Company adopted ASU 2016-18 and began presenting its cash and cash equivalents and restricted cash together in its consolidated statements of cash flows. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business, which amends the guidance of FASB Accounting Standards Codification Topic 805, “Business Combinations,” adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill, and consolidation. On February 1, 2018, the Company adopted ASU 2017-01 and the adoption did not have an impact on its consolidated financial statements as no business combinations have occurred since adoption. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment, which removes the second step of the goodwill impairment test that requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. On February 1, 2018, the Company adopted ASU 2017-04 and the adoption did not have a significant impact on its consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718) Scope of Modification Accounting, which clarifies which changes to the terms or conditions of a share-based payment award are subject to the guidance on modification accounting. Entities would apply the modification accounting guidance unless the value, vesting requirements, and classification of a share-based payment award are the same immediately before and after a change to the terms or conditions of the award. On February 1, 2018, the Company adopted ASU 2017-09 and the adoption did not have a significant impact on its consolidated financial statements.

Investments

Investments	9 Months Ended
	Oct. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	Investments The amortized costs, unrealized gains and losses and estimated fair values of the Company’s short-term investments as of October 31, 2018 were as follows (in thousands): October 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government securities $ 17,853 $ 1 $ — $ 17,854 Corporate bonds 34,224 — (33 ) 34,191 Commercial paper 44,989 — — 44,989 Total short-term investments $ 97,066 $ 1 $ (33 ) $ 97,034 The Company does not believe that any unrealized losses represent other-than-temporary impairments based on its evaluation of available evidence. There were no realized gains or losses from sales of marketable securities during the nine months ended October 31, 2018 . All securities had stated effective maturities of one year or less. The Company had no investments as of January 31, 2018.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Oct. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The accounting guidance for fair value measurements establishes a three-tier hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value as follows: Level input Input definition Level 1 Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets Level 2 Inputs other than quoted prices included within Level 1 that are observable for the asset or liability through corroboration with market data at the measurement date Level 3 Unobservable inputs that reflect management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date In general, and where applicable, the Company uses quoted prices in active markets for identical assets or liabilities to determine fair value. If quoted prices in active markets for identical assets or liabilities are not available to determine fair value, then the Company uses quoted prices for similar assets and liabilities or inputs other than the quoted prices that are observable either directly or indirectly. The following table summarizes the Company ’ s fair value hierarchy for its financial assets measured at fair value on a recurring basis as of October 31, 2018 (in thousands): October 31, 2018 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 60,657 $ — $ — $ 60,657 Commercial paper — 10,459 — 10,459 Total cash equivalents $ 60,657 $ 10,459 $ — $ 71,116 Short-term investments: U.S. government securities $ — $ 17,854 $ — $ 17,854 Corporate bonds — 34,191 — 34,191 Commercial paper — 44,989 — 44,989 Total short-term investments $ — $ 97,034 $ — $ 97,034 Restricted cash: Money market funds $ 6,434 $ — $ — $ 6,434 As of January 31, 2018 , the Company held cash equivalents and restricted cash of approximately $35.1 million in money market funds measured at fair value using Level 1 inputs. The Company did not have any other investments as of January 31, 2018. The carrying amounts of certain financial instruments, including cash held in bank accounts, accounts receivable, accounts payable, accrued expenses and capital lease obligations, approximate fair value due to their relatively short maturity. The carrying amount of debt approximates fair value due to its floating interest rate.

Prepaid Expenses and Other Curr

Prepaid Expenses and Other Current Assets	9 Months Ended
	Oct. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid Expenses and Other Current Assets	Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands): October 31, January 31, Prepaid software subscriptions $ 4,032 $ 3,239 Prepaid insurance 1,347 445 Prepaid hosting costs 1,211 486 Prepaid rent 867 657 Taxes 456 533 Short-term deposits 300 480 Prepaid employee-related costs 369 132 Capitalized offering costs — 2,460 Other 613 870 Total $ 9,195 $ 9,302

Property and Equipment, Net

Property and Equipment, Net	9 Months Ended
	Oct. 31, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	Property and Equipment, Net Property and equipment, net consisted of the following (in thousands): October 31, January 31, Servers $ 14,520 $ 11,283 Computer equipment 9,776 6,885 Software 10,345 7,148 Leasehold improvements 4,428 1,968 Furniture and fixtures 2,728 1,446 Vehicles 22 25 41,819 28,755 Less accumulated depreciation and amortization (23,431 ) (18,551 ) Total $ 18,388 $ 10,204 Depreciation and amortization expense related to property and equipment, which includes capitalized internal-use software, was $1.8 million and $4.9 million for the three and nine months ended October 31, 2018 , respectively, and $1.2 million and $3.7 million for the three and nine months ended October 31, 2017 , respectively. Depreciation and amortization expense is included in operating expenses and cost of revenue in the accompanying unaudited condensed consolidated statements of comprehensive loss. As of October 31, 2018 and January 31, 2018 , capitalized internal-use software costs, net of amortization, were $4.3 million and $3.4 million , respectively. Internal-use software amortization recorded to cost of subscription revenue was $0.4 million and $1.0 million for the three and nine months ended October 31, 2018 , respectively, and $0.3 million and $0.9 million for the three and nine months ended October 31, 2017 , respectively.

Purchased Intangible Assets

Purchased Intangible Assets	9 Months Ended
	Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Purchased Intangible Assets	Purchased Intangible Assets The following table summarizes the purchased intangible asset balances (in thousands): As of October 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 7,697 $ (3,759 ) $ 3,938 Customer relationships 5,933 (1,051 ) 4,882 Trade names 909 (184 ) 725 Total $ 14,539 $ (4,994 ) $ 9,545 As of January 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 7,697 $ (2,666 ) $ 5,031 Customer relationships 5,933 (494 ) 5,439 Trade names 909 (87 ) 822 Total $ 14,539 $ (3,247 ) $ 11,292 Amortization expense related to purchased intangible assets was approximately $0.5 million and $1.7 million for the three and nine months ended October 31, 2018 , respectively, and $0.7 million and $1.4 million for the three and nine months ended October 31, 2017 , respectively. Amortization expense related to purchased intangible assets is included in cost of subscription revenue in the accompanying unaudited condensed consolidated statements of comprehensive loss.

Accrued Expenses and Other Curr

Accrued Expenses and Other Current Liabilities	9 Months Ended
	Oct. 31, 2018
Payables and Accruals [Abstract]
Accrued Expenses and Other Current Liabilities	Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consisted of the following (in thousands): October 31, January 31, Accrued goods and services taxes $ 3,135 $ 2,488 Accrued outside services and consulting 2,722 2,006 Employee early exercised stock options 670 556 Accrued sales and use tax liability 845 431 Deferred rent, current 297 604 Accrued legal fees 170 828 Accrued IPO-related costs 210 1,120 Accrued foreign income taxes 464 221 Accrued acquisition-related payments — 12,558 Other accrued expenses 4,971 3,684 Total $ 13,484 $ 24,496

Other Long-Term Liabilities

Other Long-Term Liabilities	9 Months Ended
	Oct. 31, 2018
Other Liabilities Disclosure [Abstract]
Other Long-Term Liabilities	Other Long-Term Liabilities Other long-term liabilities consisted of the following (in thousands): October 31, January 31, Deferred rent, net of current portion $ 2,149 $ 356 Long-term income taxes payable 426 472 Early exercised common stock options 253 139 Other 366 201 Total $ 3,194 $ 1,168

Debt

Debt	9 Months Ended
	Oct. 31, 2018
Debt Disclosure [Abstract]
Debt	Debt In June 2017, the Company and certain of its subsidiaries entered into a loan and security agreement with Silicon Valley Bank that includes a revolving and term loan facility. In October 2018, the agreement was amended (Debt Agreement) to, among other things, increase the revolving loan availability to $30.0 million (from $10 million ), lower the borrowing costs under both the revolving and term loans to the prime rate published by the Wall Street Journal (WSJ Prime Rate) minus 1.00% , extend the interest-only repayment period under the term loan until June 2019, after which time principal and interest will be due in thirty-six ( 36 ) equal monthly installments, extend the revolving loan maturity date until October 2021, and extend the latest term loan maturity date until June 2022. The Company accounted for this amendment as a debt modification and will recognize the unamortized fees related to the Debt Agreement over the duration of the term loan. Revolving Loan. The Debt Agreement allows the Company to borrow up to $30.0 million until June 2019 in revolving loans. Advances drawn down under the revolving loan incur interest at the WSJ Prime Rate minus 1.00% which is due monthly on any amounts drawn down, with the principal due at maturity. Any outstanding amounts must be fully repaid on or before October 2021. The Company is required to pay an annual fee of $20,000 on this revolving loan, regardless of any amounts drawn down. As of October 31, 2018 , the Company had not drawn down any amounts under this revolving loan. Term Loan. The Debt Agreement allows the Company to borrow $15.0 million in term loans, which was drawn down in June 2017 to partially finance the acquisition of Leeyo Software, Inc. (Leeyo). Any outstanding amounts under the term loan accrue interest at the WSJ Prime rate minus 1.00% , which is due monthly through June 2019. The interest rate was 4.25% as of October 31, 2018 . Beginning with the term loan payment due on July 1, 2019, the Company is required to make equal monthly payments of principal and interest over 36 months until the term loan is repaid. The Company may prepay all outstanding principal and accrued interest at any time without penalty. The Company will incur a fee of 1.5% of the original principal amount of the term loan, or $225,000 , upon the earlier to occur of prepayment or the termination of the facility. As of October 31, 2018 , the Company had $13.4 million outstanding under the term loan. Both the revolving loan and the term loan are subject to a certain financial covenant to maintain an adjusted quick ratio of no less than 1.10 :1.00. As of October 31, 2018 , the Company was in compliance with this financial covenant. The Debt Agreement also imposes certain limitations with respect to lines of business, mergers, investments and acquisitions, additional indebtedness, distributions, guarantees, liens, and encumbrances. The Company was also in compliance with these restrictions as of October 31, 2018 . The Company incurred transaction costs and fees payable to the lender related to the issuance of the term loan. The amount, net of amortization, is immaterial and is presented as a reduction to the carrying amount of the term loan and is presented under debt in the Company's unaudited condensed consolidated balance sheets. The Company’s indebtedness under the Debt Agreement is secured by a lien on substantially all of its assets, including its intellectual property.

Income Taxes

Income Taxes	9 Months Ended
	Oct. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three months ended October 31, 2018 and 2017 , the Company recorded a tax provision of $0.2 million and nil on pretax losses of $17.7 million and $10.3 million , respectively. The effective tax rates for the three months ended October 31, 2018 and 2017 were (1.3)% and (0.3)% , respectively. The effective tax rate for the three months ended October 31, 2018 and 2017 differs from the statutory rate primarily as a result of providing no benefit on pretax losses incurred in the United States. For the three months ended October 31, 2018 , the Company maintained a full valuation allowance on its U.S. federal and state net deferred tax assets as it was more likely than not that those deferred tax assets will not be realized. For the nine months ended October 31, 2018 and 2017 , the Company recorded a tax provision of $0.6 million and $0.4 million on pretax losses of $56.3 million and $32.9 million , respectively. The effective tax rates for the nine months ended October 31, 2018 and 2017 were (1.1)% and (1.2)% , respectively. The effective tax rate for the nine months ended October 31, 2018 and 2017 differs from the statutory rate primarily as a result of providing no benefit on pretax losses incurred in the United States. For the nine months ended October 31, 2018 , the Company maintained a full valuation allowance on its U.S. federal and state net deferred tax assets as it was more likely than not that those deferred tax assets will not be realized. On December 22, 2017, the Tax Act was signed into law making significant changes to the Internal Revenue Code. Changes include, but are not limited to, a corporate tax rate decrease from 35% to 21% effective for tax years beginning after December 31, 2017, and changes to how the United States imposes income tax on multinational corporations. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (SAB 118), which allows the Company to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. In fiscal 2018, the Company calculated an estimate of the expected decrease on its existing deferred tax balances due to the decrease in the tax rate. The Company determined the impact to be approximately a $30.0 million decrease in its deferred tax assets. Because the Company provides a valuation allowance against its tax assets, it consequently adjusted the valuation allowance to compensate for this reduction in the provision. As of January 31, 2018, the Company had not completed its accounting for the tax effects of enactment of the Tax Act; however, the Company has made a reasonable estimate of the effects on its existing deferred tax balances and the one-time transition tax. For the nine months ended October 31, 2018, the Company has not made a material adjustment to the provisional amount. The Company will continue to assess its provision for income taxes as future guidance is issued, but it does not currently anticipate significant revisions will be necessary. Any such revisions will be treated in accordance with the measurement period guidance outlined in SAB 118.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Oct. 31, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity Convertible Preferred Stock Immediately prior to the completion of the IPO, all shares of convertible preferred stock then outstanding were converted into 62.0 million shares of Class B common stock on a one-to-one basis. As of October 31, 2018 , there were no shares of convertible preferred stock issued and outstanding. Common Stock Prior to the IPO, all shares of common stock then outstanding were reclassified into Class B common stock. Shares offered and sold in the IPO consisted of newly authorized shares of Class A common stock. As of October 31, 2018 , the Company had authorized 500 million shares of Class A common stock and 500 million shares of Class B common stock, each with a par value of $0.0001 per share. As of October 31, 2018 , 72.6 million shares of Class A common stock and 35.8 million shares of Class B common stock were issued and outstanding. Holders of Class A and Class B common stock are entitled to one vote per share and ten votes per share, respectively, and the shares of Class A common stock and Class B common stock are identical, except for voting and conversion rights. Accumulated Other Comprehensive Income Components of accumulated other comprehensive income were as follows (in thousands): Foreign currency items Unrealized loss on available-for-sale securities Total Balance, February 1, 2018 $ 471 $ — $ 471 Foreign currency translation adjustment (341 ) — (341 ) Unrealized loss on available-for-sale securities — (32 ) (32 ) Balance, October 31, 2018 $ 130 $ (32 ) $ 98 There were no reclassifications out of accumulated other comprehensive income during the nine months ended October 31, 2018 . Additionally, there was no tax impact on the amounts presented.

Employee Stock Plans

Employee Stock Plans	9 Months Ended
	Oct. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Stock Plans	Employee Stock Plans Equity Incentive Plans In March 2018, the Company’s Board of Directors adopted and its stockholders approved the 2018 Equity Incentive Plan (2018 Plan). The 2018 Plan authorizes the award of stock options, restricted stock awards, stock appreciation rights, RSUs, performance awards, and stock bonuses. As of October 31, 2018 , approximately 9.1 million shares of Class A common stock were reserved and available for issuance under the 2018 Plan. In addition, as of October 31, 2018 , 16.0 million stock options and RSUs exercisable or settleable for Class B common stock were outstanding in the aggregate under the Company’s 2006 Stock Plan (2006 Plan) and 2015 Equity Incentive Plan (2015 Plan), which plans were terminated in May 2015 and April 2018, respectively. The 2006 Plan and 2015 Plan continue to govern outstanding equity awards granted thereunder. Stock Options The following table summarizes stock option activity and related information (in thousands except exercise price and contractual term): Shares Subject To Outstanding Stock Options Weighted Average Exercise Price Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Balance as of January 31, 2018 15,401 $ 3.56 7.91 $ 83,322 Granted 3,663 8.41 Exercised (2,913 ) 3.10 Forfeited (506 ) 5.40 Balance as of October 31, 2018 15,645 4.72 7.73 245,957 Exercisable as of October 31, 2018 15,389 4.59 7.75 243,660 Vested and expected to vest as of October 31, 2018 14,977 $ 4.64 7.68 $ 236,536 The weighted average grant date fair value per share of options granted during the three months ended October 31, 2018 was $10.24 , and was $6.80 and $1.87 for the nine months ended October 31, 2018 and 2017 , respectively. The aggregate intrinsic value of options exercised during the three months ended October 31, 2018 was $13.6 million , and was $31.5 million and $2.4 million for the nine months ended October 31, 2018 and 2017 , respectively. As of October 31, 2018 , there was $28.8 million of unrecognized compensation cost related to unvested stock options, which is expected to be recognized over the next 2.4 years . The Company used the Black-Scholes option-pricing model to estimate the fair value of its stock options granted with the following assumptions: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Fair value of common stock $27.86 $5.54 - $5.88 $12.28 - $27.86 $3.28 - $5.88 Expected volatility 32.4% 40.0% - 42.3% 39.2% - 40.9% 40.0% - 42.6% Expected term (years) 5.9 - 6.0 4.3 - 6.9 5.1 - 6.4 4.3 - 7.0 Risk-free interest rate 2.82% 1.67% - 2.18% 2.62% - 2.87% 1.67% - 2.26% Expected dividend yield — — — — Options Subject to Early Exercise At the discretion of the Company’s Board of Directors, certain options may be exercisable immediately at the date of grant but are subject to a repurchase right, under which the Company may buy back any unvested shares at the lower of their original exercise price or then current fair market value in the event of an employee’s termination prior to vesting. The consideration received for an exercise of an unvested option is considered to be a deposit of the exercise price and the related dollar amount is recorded as a liability. The liabilities are reclassified into equity as the awards vest. As of October 31, 2018 and January 31, 2018 , the Company had $0.9 million and $0.7 million , respectively, recorded in accrued expenses and other current liabilities, and other long-term liabilities, related to early exercises of options to acquire 0.2 million and 0.2 million shares of common stock, respectively. RSU and Restricted Stock Award Activity The following table summarizes RSU and restricted stock award activity and related information for the nine months ended October 31, 2018 (in thousands except grant date fair value): Number of RSU and Restricted Shares Outstanding Weighted-Average Grant Date Fair Value Balance as of January 31, 2018 3,037 $ 5.37 Granted 1,116 26.25 Vested (1,028 ) 5.47 Forfeited (64 ) 12.77 Balance as of October 31, 2018 3,061 $ 12.80 As of October 31, 2018 , there was $32.9 million of unrecognized compensation cost related to unvested RSUs and restricted stock awards, which is expected to be recognized over the next 2.5 years . 2018 Employee Stock Purchase Plan In March 2018, the Company adopted the ESPP, which became effective on the date of the Prospectus. The ESPP initially reserved and authorized the issuance of up to a total of 2.4 million shares of Class A common stock to participating employees. The initial offering period began April 11, 2018 and will end on June 14, 2020 with purchase dates of December 14, 2018, June 14, 2019, December 14, 2019 and June 14, 2020. Except for the initial offering period, the ESPP provides for 24-month offering periods beginning June 15 and December 15 of each year, and each offering period will consist of four six-month purchase periods. On each purchase date, ESPP participants will purchase shares of the Company’s Class A common stock at a price per share equal to 85% of the lesser of (1) the fair market value of the Class A common stock on the offering date or (2) the fair market value of the Class A common stock on the purchase date. As of October 31, 2018 , there was approximately $4.9 million of unrecognized stock-based compensation expense related to the ESPP that is expected to be recognized over the remaining term of the initial offering period. The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Fair value of common stock $ — $ — $ 14.00 $ — Expected volatility — — 24.6% - 29.9% — Expected term (in years) — — 0.7 - 2.2 — Risk-free interest rate — — 2.01% - 2.36% — Expected dividend yield — — — — Stock-Based Compensation Expense Stock-based compensation expense was recorded in the following cost and expense categories in the accompanying unaudited condensed consolidated statements of comprehensive loss (in thousands): Three Months Ended Nine Months Ended 2018 2017 2018 2017 Cost of subscription revenue $ 555 $ 239 $ 1,311 $ 490 Cost of professional services revenue 1,685 733 4,115 1,229 Research and development 1,902 729 4,366 1,537 Sales and marketing 2,205 1,012 5,317 1,975 General and administrative 1,112 328 2,613 763 Total stock-based compensation expense $ 7,459 $ 3,041 $ 17,722 $ 5,994

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies (a) Leases The Company periodically leases facilities and equipment under noncancelable capital and operating leases. The terms of the lease agreements may provide for rental payments on a graduated basis, and accordingly, the Company recognizes related rent expense on a straight-line basis over the entire lease term, and has accrued for rent expense incurred but not paid. In October 2018, the Company signed an agreement to purchase data center equipment and related software previously held under several capital leases. The Company paid $2.3 million in cash in November 2018 related to this purchase. At October 31, 2018 , this purchase commitment was recorded in lease obligations, current portion in the accompanying unaudited condensed consolidated balance sheet. In November 2018, the Company canceled letters of credit for $4.3 million that it had previously issued in connection with these leases. As of October 31, 2018 , the Company had operating leases for its offices in the United States and other locations around the world. The Company also had operating leases for facilities related to its U.S. data centers in Las Vegas, Nevada and Santa Clara, California. The initial lease term for these facilities ranged from three to seven years and includes approximately 155,000 square feet of space. In connection with these leased facilities, the Company had outstanding bank issued irrevocable letters of credit on the leases of $2.1 million as of October 31, 2018 , classified as restricted cash on the accompanying unaudited condensed consolidated balance sheet. Certain facility lease agreements contain allowances, rent holidays, and escalation provisions. For these leases, the Company recognizes the related rental expense on a straight-line basis over the lease period of the facility and records the difference between amounts charged to operations and amounts paid as deferred rent. Deferred rent was $2.4 million and $1.0 million as of October 31, 2018 and January 31, 2018 , respectively, and is included in accrued expenses and other current liabilities and other long-term liabilities in the accompanying unaudited condensed consolidated balance sheets. Rent expense was $2.8 million and $7.2 million for the three and nine months ended October 31, 2018 , respectively, and $1.4 million and $4.1 million for the three and nine months ended October 31, 2017 , respectively. As of October 31, 2018 , the future minimum lease payments under capital and operating leases by fiscal year were as follows (in thousands): Capital Leases Operating Leases Remainder of 2019 $ 2,287 $ 1,531 2020 — 7,543 2021 — 5,783 2022 — 5,908 2023 — 5,790 Thereafter — 4,308 Total future lease commitments $ 2,287 $ 30,863 (b) Legal Matters The Company may be subject to legal proceedings, as well as demands, claims and threatened litigation that arise in the normal course of its business. Although the results of litigation and claims cannot be predicted with certainty, the Company currently believes that the final outcome of such matters will not have a material adverse effect on the Company’s results of operations or financial condition. (c) Other Contractual Obligations As of October 31, 2018 , the Company had a contractual obligation to purchase $11.3 million in web hosting services from one of its vendors by September 30, 2019 .

Net Loss Per Share Attributable

Net Loss Per Share Attributable to Common Stockholders	9 Months Ended
	Oct. 31, 2018
Earnings Per Share [Abstract]
Net Loss Per Share Attributable to Common Stockholders	Net Loss Per Share Attributable to Common Stockholders Basic and diluted net loss per common share is presented in conformity with the two-class method required for participating securities. Class A and Class B common stock are the only outstanding equity in the Company. The rights of the holders of Class A and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to ten votes per share. Shares of Class B common stock may be converted into Class A common stock at any time at the option of the stockholder, and are automatically converted into Class A common stock upon sale or transfer, subject to certain limited exceptions. Basic net loss per share attributable to common stockholders is computed using the weighted-average number of common shares outstanding during the period. Diluted net loss per share attributable to common stockholders is computed using the weighted-average number of common shares and, if dilutive, potential common shares outstanding during the period. The dilutive effect of these potential common shares is reflected in diluted earnings per share by application of the treasury stock method. The following table presents the calculation of basic and diluted net loss per share attributable to common stockholders for the periods presented (in thousands, except per share data): Three Months Ended Nine Months Ended 2018 2017 2018 2017 Numerator: Net loss $ (17,889 ) $ (10,365 ) $ (56,923 ) $ (33,332 ) Denominator: Weighted-average common shares outstanding, basic and diluted 106,049 29,314 85,820 26,145 Net loss per share attributable to common stockholders, basic and diluted $ (0.17 ) $ (0.35 ) $ (0.66 ) $ (1.27 ) Since the Company was in a loss position for all periods presented, basic net loss per share attributable to common stockholders is the same as diluted net loss per share attributable to common stockholders as the inclusion of all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): October 31, 2018 2017 Conversion of convertible preferred stock — 61,984 Issued and outstanding stock options 15,645 14,971 Unvested restricted stock issued and outstanding 1,495 2,439 Unvested RSUs issued and outstanding 1,566 839 Shares committed under ESPP 398 — Total 19,104 80,233

Related Party Transactions

Related Party Transactions	9 Months Ended
	Oct. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Certain members of the Company’s Board of Directors serve or are closely affiliated with people who serve on the board of directors of companies that are customers or vendors of the Company. Certain of the Company’s executive officers also serve on the board of directors of companies that are customers or vendors of the Company. The Company had no related party transactions during the three months ended October 31, 2018 . In November 2017 and April 2018, the Company paid an aggregate $5.6 million of taxes owed in connection with restricted stock granted to two employees in exchange for full-recourse promissory notes, which notes were secured by 4.6 million shares of common stock. The notes accrued interest at rates ranging from 1.85% to 2.72% and were payable in full upon the earlier of: (i) a change in control or (ii) January 12, 2019. Consistent with ASC 505-10-45, the notes receivable balance is presented as a deduction from stockholders’ equity. In August 2018, the notes were fully repaid.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Policies)	9 Months Ended
	Oct. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly owned subsidiaries, have been prepared in conformity with accounting principles generally accepted in the United States (U.S. GAAP) and applicable rules and regulations of the Securities and Exchange Commission (SEC) regarding interim financial reporting. All intercompany balances and transactions have been eliminated in consolidation. The unaudited condensed consolidated balance sheet as of January 31, 2018 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including certain notes required by U.S. GAAP on an annual reporting basis. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the balance sheet, statements of comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year ending January 31, 2019 or any future period. The unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s final prospectus dated April 11, 2018 (Prospectus) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with generally accepted accounting principles requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities at the date of the consolidated financial statements, as well as reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from those estimates. The Company’s most significant estimates and assumptions are related to revenue recognition with respect to the determination of the relative selling prices for the Company’s services; determination of the fair value of the Company’s common stock for valuation of the Company’s stock-based awards issued prior to the completion of the IPO; valuation of the Company’s stock-based awards; estimates of allowance for doubtful accounts; estimates of the fair value of goodwill, intangible assets and other long-lived assets; and the valuation of deferred income tax assets and contingencies. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Accordingly, actual results may differ materially from these estimates under different assumptions or conditions.
Short-term Investments	Short-term Investments The Company typically invests in high quality, investment grade securities from diverse issuers. The Company classifies its short-term investments as available-for-sale. In general, these investments are free of trading restrictions. The Company carries these investments at fair value, based on quoted market prices or other readily available market information. Unrealized gains and losses, net of taxes, are included in accumulated other comprehensive income, which is reflected as a separate component of stockholders’ equity in the Company’s consolidated balance sheets. Gains and losses are recognized when realized in the Company's consolidated statements of comprehensive loss. When the Company has determined that an other-than-temporary decline in fair value has occurred, the amount of the decline that is related to a credit loss is recognized in income. Gains and losses are determined using the specific identification method. The Company reviews its debt securities classified as short-term investments on a regular basis to evaluate whether or not any security has experienced an other-than-temporary decline in fair value. The Company considers factors such as the length of time and extent to which the market value has been less than the cost, the financial condition and near-term prospects of the issuer and our intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s amortized cost basis. If the Company believes that an other-than-temporary decline exists in one of these securities, it will write down these investments to fair value. The portion of the write-down related to credit loss would be recorded to interest and other income (expense), net in our consolidated statements of comprehensive loss. Any portion not related to credit loss would be recorded to accumulated other comprehensive income, which is reflected as a separate component of stockholders' equity in our consolidated balance sheets. The Company may sell its short-term investments at any time, without significant penalty, for use in current operations or for other purposes, even if they have not yet reached maturity. As a result, the Company has classified its investments, including any securities with maturities beyond 12 months, as current assets in the accompanying unaudited condensed consolidated balance sheet as of October 31, 2018 . Securities with original or remaining maturities of three months or less on the purchase date are considered to be cash equivalents and are reflected in cash and cash equivalents in the accompanying unaudited condensed consolidated balance sheet as of October 31, 2018 .
Stock-Based Compensation	Stock-Based Compensation All stock-based compensation to employees, including the purchase rights issued under the Company’s 2018 Employee Stock Purchase Plan (ESPP), is based on the fair value of the awards on the date of grant. This fair value is recognized as an expense following the straight-line attribution method over the requisite service period of the entire award for stock options, restricted stock units (RSUs) and restricted stock; and over the offering period for the purchase rights issued under the ESPP. The Company uses the Black-Scholes option pricing model to measure the fair value of its stock options and the purchase rights issued under the ESPP. The fair value of the RSUs and restricted stock is determined using the fair value of the Company’s Class A common stock on the date of grant. Prior to the IPO, the fair value of the Company’s common stock was determined by the estimated fair value of the Company’s common stock at the time of grant. After the IPO, the Company uses the closing market price of its Class A common stock on the date of grant for the fair value. Stock-based compensation expense is recorded net of estimated forfeitures in the Company’s consolidated statements of comprehensive loss.
Recent Accounting Pronouncements	Recent Accounting Pronouncements—Not Yet Adopted The Jumpstart Our Business Startups Act (JOBS Act) allows the Company, as an “emerging growth company,” to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. The adoption dates discussed below reflect this election. In May 2014, the Financial Accounting Standards Board (FASB) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) and has modified the standard thereafter. These standards replace existing revenue recognition rules with a comprehensive revenue measurement and recognition standard and expanded disclosure requirements. ASU 2014-09, as amended, became effective for public companies for the fiscal year beginning after December 15, 2017 and interim periods within that year. Private companies have an additional year to adopt the standard. The two permitted transition methods under the new standard are the full retrospective method, under which ASU 2014-09 would be applied to each prior reporting period presented and the cumulative effect of applying the standard would be recognized at the earliest period shown, or the modified retrospective method, under which the cumulative effect of applying ASU 2014-09 would be recognized at the date of initial application. The Company plans to adopt the new revenue standard when it becomes effective for the Company for the fiscal year ending January 31, 2020 (i.e., effective February 1, 2019). The Company is currently in the process of determining what method of adoption it plans to use. The Company is currently assessing the effect the guidance will have on its condensed consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01 (Subtopic 825-10), Financial Instruments—Overall: Recognition and Measurement of Financial Assets and Financial Liabilities, which primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the FASB clarified guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale debt securities. The accounting for other financial instruments, such as loans, investments in debt securities, and financial liabilities is largely unchanged. ASU 2016-01 is effective for fiscal years beginning after December 15, 2018, and interim periods in fiscal years beginning after December 15, 2019. Early adoption is permitted. The Company has not yet adopted ASU 2016-01 and is currently evaluating the impact of adoption on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842)—Leases, which supersedes the guidance in topic ASC 840, Leases. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases today. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases and ASU 2018-11, Leases (Topic 842): Targeted Improvements. ASU 2018-10 clarifies certain areas within ASU 2016-02. ASU 2018-11 allows entities an additional transition method to the existing requirements whereby an entity could adopt the provisions of ASU 2016-02 by recognizing a cumulative-effect adjustment to the op ening balance of retained earnings in the period of adoption without adjustment to the financial statements for periods prior to adoption. ASU 2018-11 also allows a practical expedient that permits lessors to not separate non-lease component s from the associated lease component if certain conditions are present. ASU 2016-02, ASU2018-10 and ASU 2018-11 (collectively, Topic 842) will be effective for fiscal years beginning after December 15, 2019 and interim periods within fiscal years beginning after December 15, 2020. Early adoption is permitted. The Company has not yet adopted Topic 842 and is currently evaluating the impact of the adoption of this standard on its consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Under existing U.S. GAAP, the effects of changes in tax rates and laws on deferred tax balances are recorded as a component of income tax expense in the period in which the law was enacted. When deferred tax balances related to items originally recorded in accumulated other comprehensive income are adjusted, certain tax effects become stranded in accumulated other comprehensive income. The amendments in ASU 2018-02 allow a reclassification from accumulated other comprehensive income to retained earnings (accumulated deficit) for stranded income tax effects resulting from the Tax Cuts and Jobs Act (the Tax Act). The amendments in this ASU also require certain disclosures about stranded income tax effects. The guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption in any period is permitted. The Company’s provisional adjustments recorded in the fiscal year ended January 31, 2018 to account for the impact of the Tax Act did not result in stranded tax effects. The Company has not yet adopted ASU 2018-02 and does not expect the adoption to have a significant impact on its consolidated financial statements. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718) Improvements to Nonemployee Share-Based Payment Accounting. The guidance expands the scope of the topic to include share-based payments granted to non-employees in exchange for goods or services. Upon adoption, the fair value of awards granted to non-employees will be determined as of the grant date, which will be recognized over the service period. Previous guidance required the awards to be remeasured at fair value periodically when determining the related expense. ASU 2018-07 is effective for public business entities for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. Early adoption is permitted, but no earlier than an entity’s adoption date of Topic 606. The Company has not yet adopted ASU 2018-07 and does not expect the adoption to have a significant impact on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement, which amends ASC 820, 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, but public companies will be required to disclose the range and weighted-average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU 2018-13 is effective for interim and annual periods beginning after December 15, 2019 and early adoption is permitted. The Company has not yet adopted ASU 2018-13 and does not expect the adoption to have a significant impact on its consolidated financial statements. In August 2018, the FASB issued ASU 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. This standard 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. The standard is effective for annual periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021, with early adoption permitted. The Company has not yet adopted ASU 2018-15 and does not expect the adoption to have a significant impact on its consolidated financial statements. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that have become redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. The final rule is effective November 5, 2018. We expect to present this analysis beginning with our Quarterly Report on Form 10-Q for the three months ending April 30, 2019. Recent Accounting Pronouncements—Adopted The Company adopted ASU No. 2016-09 (Topic 718), Improvements to Employee Share-Based Payments Accounting, effective February 1, 2018. The Company elected to continue to estimate its forfeiture rate. The adoption of this standard did not have an effect on the statement of cash flows. In November 2016, the FASB issued ASU No. 2016-18 (Topic 230), Statement of Cash Flows, Restricted Cash, which amends the guidance in ASC 230 Statement of Cash Flows and requires that entities show the changes in total of cash, cash equivalents, restricted cash, and restricted cash equivalents in their statement of cash flows. As a result, entities will no longer present transfers between cash and cash equivalents and restricted cash and restricted cash equivalents in the statement of cash flows. On February 1, 2018, the Company adopted ASU 2016-18 and began presenting its cash and cash equivalents and restricted cash together in its consolidated statements of cash flows. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business, which amends the guidance of FASB Accounting Standards Codification Topic 805, “Business Combinations,” adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill, and consolidation. On February 1, 2018, the Company adopted ASU 2017-01 and the adoption did not have an impact on its consolidated financial statements as no business combinations have occurred since adoption. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment, which removes the second step of the goodwill impairment test that requires a hypothetical purchase price allocation. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. On February 1, 2018, the Company adopted ASU 2017-04 and the adoption did not have a significant impact on its consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718) Scope of Modification Accounting, which clarifies which changes to the terms or conditions of a share-based payment award are subject to the guidance on modification accounting. Entities would apply the modification accounting guidance unless the value, vesting requirements, and classification of a share-based payment award are the same immediately before and after a change to the terms or conditions of the award. On February 1, 2018, the Company adopted ASU 2017-09 and the adoption did not have a significant impact on its consolidated financial statements.

Investments (Tables)

Investments (Tables)	9 Months Ended
	Oct. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost, Unrealized Gains and Losses, and Estimated Fair Value of Short-term Investments	The amortized costs, unrealized gains and losses and estimated fair values of the Company’s short-term investments as of October 31, 2018 were as follows (in thousands): October 31, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government securities $ 17,853 $ 1 $ — $ 17,854 Corporate bonds 34,224 — (33 ) 34,191 Commercial paper 44,989 — — 44,989 Total short-term investments $ 97,066 $ 1 $ (33 ) $ 97,034

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Oct. 31, 2018
Fair Value Disclosures [Abstract]
Summary of Fair Value Hierarchy for Financial Assets Measured on a Recurring Basis	The following table summarizes the Company ’ s fair value hierarchy for its financial assets measured at fair value on a recurring basis as of October 31, 2018 (in thousands): October 31, 2018 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 60,657 $ — $ — $ 60,657 Commercial paper — 10,459 — 10,459 Total cash equivalents $ 60,657 $ 10,459 $ — $ 71,116 Short-term investments: U.S. government securities $ — $ 17,854 $ — $ 17,854 Corporate bonds — 34,191 — 34,191 Commercial paper — 44,989 — 44,989 Total short-term investments $ — $ 97,034 $ — $ 97,034 Restricted cash: Money market funds $ 6,434 $ — $ — $ 6,434

Prepaid Expenses and Other Cu_2

Prepaid Expenses and Other Current Assets (Tables)	9 Months Ended
	Oct. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): October 31, January 31, Prepaid software subscriptions $ 4,032 $ 3,239 Prepaid insurance 1,347 445 Prepaid hosting costs 1,211 486 Prepaid rent 867 657 Taxes 456 533 Short-term deposits 300 480 Prepaid employee-related costs 369 132 Capitalized offering costs — 2,460 Other 613 870 Total $ 9,195 $ 9,302

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	9 Months Ended
	Oct. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): October 31, January 31, Servers $ 14,520 $ 11,283 Computer equipment 9,776 6,885 Software 10,345 7,148 Leasehold improvements 4,428 1,968 Furniture and fixtures 2,728 1,446 Vehicles 22 25 41,819 28,755 Less accumulated depreciation and amortization (23,431 ) (18,551 ) Total $ 18,388 $ 10,204

Purchased Intangible Assets (Ta

Purchased Intangible Assets (Tables)	9 Months Ended
	Oct. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Purchased Intangible Assets	The following table summarizes the purchased intangible asset balances (in thousands): As of October 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 7,697 $ (3,759 ) $ 3,938 Customer relationships 5,933 (1,051 ) 4,882 Trade names 909 (184 ) 725 Total $ 14,539 $ (4,994 ) $ 9,545 As of January 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 7,697 $ (2,666 ) $ 5,031 Customer relationships 5,933 (494 ) 5,439 Trade names 909 (87 ) 822 Total $ 14,539 $ (3,247 ) $ 11,292

Accrued Expenses and Other Cu_2

Accrued Expenses and Other Current Liabilities (Tables)	9 Months Ended
	Oct. 31, 2018
Payables and Accruals [Abstract]
Schedule of Accrued Expenses and Other Current Liabilities	Accrued expenses and other current liabilities consisted of the following (in thousands): October 31, January 31, Accrued goods and services taxes $ 3,135 $ 2,488 Accrued outside services and consulting 2,722 2,006 Employee early exercised stock options 670 556 Accrued sales and use tax liability 845 431 Deferred rent, current 297 604 Accrued legal fees 170 828 Accrued IPO-related costs 210 1,120 Accrued foreign income taxes 464 221 Accrued acquisition-related payments — 12,558 Other accrued expenses 4,971 3,684 Total $ 13,484 $ 24,496

Other Long-Term Liabilities (Ta

Other Long-Term Liabilities (Tables)	9 Months Ended
	Oct. 31, 2018
Other Liabilities Disclosure [Abstract]
Schedule of Other Long-Term Liabilities	Other long-term liabilities consisted of the following (in thousands): October 31, January 31, Deferred rent, net of current portion $ 2,149 $ 356 Long-term income taxes payable 426 472 Early exercised common stock options 253 139 Other 366 201 Total $ 3,194 $ 1,168

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Oct. 31, 2018
Equity [Abstract]
Schedule of Components of Accumulated Other Comprehensive Income	Components of accumulated other comprehensive income were as follows (in thousands): Foreign currency items Unrealized loss on available-for-sale securities Total Balance, February 1, 2018 $ 471 $ — $ 471 Foreign currency translation adjustment (341 ) — (341 ) Unrealized loss on available-for-sale securities — (32 ) (32 ) Balance, October 31, 2018 $ 130 $ (32 ) $ 98

Employee Stock Plans (Tables)

Employee Stock Plans (Tables)	9 Months Ended
	Oct. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Stock Option Activity	The following table summarizes stock option activity and related information (in thousands except exercise price and contractual term): Shares Subject To Outstanding Stock Options Weighted Average Exercise Price Average Remaining Contractual Term (Years) Aggregate Intrinsic Value Balance as of January 31, 2018 15,401 $ 3.56 7.91 $ 83,322 Granted 3,663 8.41 Exercised (2,913 ) 3.10 Forfeited (506 ) 5.40 Balance as of October 31, 2018 15,645 4.72 7.73 245,957 Exercisable as of October 31, 2018 15,389 4.59 7.75 243,660 Vested and expected to vest as of October 31, 2018 14,977 $ 4.64 7.68 $ 236,536
Schedule of Valuation Assumptions for Estimated Fair Value of Stock Options	The Company used the Black-Scholes option-pricing model to estimate the fair value of its stock options granted with the following assumptions: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Fair value of common stock $27.86 $5.54 - $5.88 $12.28 - $27.86 $3.28 - $5.88 Expected volatility 32.4% 40.0% - 42.3% 39.2% - 40.9% 40.0% - 42.6% Expected term (years) 5.9 - 6.0 4.3 - 6.9 5.1 - 6.4 4.3 - 7.0 Risk-free interest rate 2.82% 1.67% - 2.18% 2.62% - 2.87% 1.67% - 2.26% Expected dividend yield — — — —
Schedule of RSU and Restricted Stock Award Activity	The following table summarizes RSU and restricted stock award activity and related information for the nine months ended October 31, 2018 (in thousands except grant date fair value): Number of RSU and Restricted Shares Outstanding Weighted-Average Grant Date Fair Value Balance as of January 31, 2018 3,037 $ 5.37 Granted 1,116 26.25 Vested (1,028 ) 5.47 Forfeited (64 ) 12.77 Balance as of October 31, 2018 3,061 $ 12.80
Schedule of Valuation Assumptions for Estimated Fair Value of Employee Stock Purchase Plan	The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions: Three Months Ended Nine Months Ended 2018 2017 2018 2017 Fair value of common stock $ — $ — $ 14.00 $ — Expected volatility — — 24.6% - 29.9% — Expected term (in years) — — 0.7 - 2.2 — Risk-free interest rate — — 2.01% - 2.36% — Expected dividend yield — — — —
Schedule of Stock-Based Compensation Expense	Stock-based compensation expense was recorded in the following cost and expense categories in the accompanying unaudited condensed consolidated statements of comprehensive loss (in thousands): Three Months Ended Nine Months Ended 2018 2017 2018 2017 Cost of subscription revenue $ 555 $ 239 $ 1,311 $ 490 Cost of professional services revenue 1,685 733 4,115 1,229 Research and development 1,902 729 4,366 1,537 Sales and marketing 2,205 1,012 5,317 1,975 General and administrative 1,112 328 2,613 763 Total stock-based compensation expense $ 7,459 $ 3,041 $ 17,722 $ 5,994

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Oct. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments Under Operating Leases	As of October 31, 2018 , the future minimum lease payments under capital and operating leases by fiscal year were as follows (in thousands): Capital Leases Operating Leases Remainder of 2019 $ 2,287 $ 1,531 2020 — 7,543 2021 — 5,783 2022 — 5,908 2023 — 5,790 Thereafter — 4,308 Total future lease commitments $ 2,287 $ 30,863
Schedule of Future Minimum Lease Payments Under Capital Leases	As of October 31, 2018 , the future minimum lease payments under capital and operating leases by fiscal year were as follows (in thousands): Capital Leases Operating Leases Remainder of 2019 $ 2,287 $ 1,531 2020 — 7,543 2021 — 5,783 2022 — 5,908 2023 — 5,790 Thereafter — 4,308 Total future lease commitments $ 2,287 $ 30,863

Net Loss Per Share Attributab_2

Net Loss Per Share Attributable to Common Stockholders (Tables)	9 Months Ended
	Oct. 31, 2018
Earnings Per Share [Abstract]
Schedule of Calculation of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share attributable to common stockholders for the periods presented (in thousands, except per share data): Three Months Ended Nine Months Ended 2018 2017 2018 2017 Numerator: Net loss $ (17,889 ) $ (10,365 ) $ (56,923 ) $ (33,332 ) Denominator: Weighted-average common shares outstanding, basic and diluted 106,049 29,314 85,820 26,145 Net loss per share attributable to common stockholders, basic and diluted $ (0.17 ) $ (0.35 ) $ (0.66 ) $ (1.27 )
Schedule of Potential Dilutive Securities Not Included in the Diluted Per Share Calculations	Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive were as follows (in thousands): October 31, 2018 2017 Conversion of convertible preferred stock — 61,984 Issued and outstanding stock options 15,645 14,971 Unvested restricted stock issued and outstanding 1,495 2,439 Unvested RSUs issued and outstanding 1,566 839 Shares committed under ESPP 398 — Total 19,104 80,233

Overview and Basis of Present_2

Overview and Basis of Presentation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended
	Apr. 30, 2018	Oct. 31, 2018	Oct. 31, 2017
Class of Stock [Line Items]
Public offering price (in dollars per share)	$ 14
Aggregate proceeds received, net		$ 164,703	$ 0
Class A common stock
Class of Stock [Line Items]
Common stock outstanding (in shares)		72,600,000
Class B common stock
Class of Stock [Line Items]
Common stock issued upon conversion of convertible preferred stock (in shares)	62,000,000
Number of common shares issued for each share of convertible preferred stock (in shares)	1
Common stock outstanding (in shares)		35,800,000
IPO
Class of Stock [Line Items]
Shares issued and sold (in shares)	12,700,000
Aggregate proceeds received, net	$ 162,200
Over-Allotment Option
Class of Stock [Line Items]
Shares issued and sold (in shares)	1,700,000

Investments - Schedule of Inves

Investments - Schedule of Investments (Details)	9 Months Ended
	Oct. 31, 2018USD ($)
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 97,066,000
Gross Unrealized Gains	1,000
Gross Unrealized Losses	(33,000)
Fair Value	97,034,000
Realized gain (loss) on sale of marketable securities	0
U.S. government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,853,000
Gross Unrealized Gains	1,000
Gross Unrealized Losses	0
Fair Value	17,854,000
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34,224,000
Gross Unrealized Gains	0
Gross Unrealized Losses	(33,000)
Fair Value	34,191,000
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,989,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	$ 44,989,000

Fair Value Measurements - Finan

Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Assets Measured on Recurring Basis
Short-term investments	$ 97,034
U.S. government securities
Assets Measured on Recurring Basis
Short-term investments	17,854
Corporate bonds
Assets Measured on Recurring Basis
Short-term investments	34,191
Commercial paper
Assets Measured on Recurring Basis
Short-term investments	44,989
Recurring
Assets Measured on Recurring Basis
Cash equivalents	71,116
Short-term investments	97,034
Recurring | Money market funds
Assets Measured on Recurring Basis
Cash equivalents	60,657
Restricted cash	6,434
Recurring | Commercial paper
Assets Measured on Recurring Basis
Cash equivalents	10,459
Recurring | U.S. government securities
Assets Measured on Recurring Basis
Short-term investments	17,854
Recurring | Corporate bonds
Assets Measured on Recurring Basis
Short-term investments	34,191
Recurring | Commercial paper
Assets Measured on Recurring Basis
Short-term investments	44,989
Recurring | Level 1
Assets Measured on Recurring Basis
Cash equivalents	60,657
Short-term investments	0
Recurring | Level 1 | Money market funds
Assets Measured on Recurring Basis
Cash equivalents	60,657
Restricted cash	6,434
Cash equivalents and restricted cash		$ 35,100
Recurring | Level 1 | Commercial paper
Assets Measured on Recurring Basis
Cash equivalents	0
Recurring | Level 1 | U.S. government securities
Assets Measured on Recurring Basis
Short-term investments	0
Recurring | Level 1 | Corporate bonds
Assets Measured on Recurring Basis
Short-term investments	0
Recurring | Level 1 | Commercial paper
Assets Measured on Recurring Basis
Short-term investments	0
Recurring | Level 2
Assets Measured on Recurring Basis
Cash equivalents	10,459
Short-term investments	97,034
Recurring | Level 2 | Money market funds
Assets Measured on Recurring Basis
Cash equivalents	0
Restricted cash	0
Recurring | Level 2 | Commercial paper
Assets Measured on Recurring Basis
Cash equivalents	10,459
Recurring | Level 2 | U.S. government securities
Assets Measured on Recurring Basis
Short-term investments	17,854
Recurring | Level 2 | Corporate bonds
Assets Measured on Recurring Basis
Short-term investments	34,191
Recurring | Level 2 | Commercial paper
Assets Measured on Recurring Basis
Short-term investments	44,989
Recurring | Level 3
Assets Measured on Recurring Basis
Cash equivalents	0
Short-term investments	0
Recurring | Level 3 | Money market funds
Assets Measured on Recurring Basis
Cash equivalents	0
Restricted cash	0
Recurring | Level 3 | Commercial paper
Assets Measured on Recurring Basis
Cash equivalents	0
Recurring | Level 3 | U.S. government securities
Assets Measured on Recurring Basis
Short-term investments	0
Recurring | Level 3 | Corporate bonds
Assets Measured on Recurring Basis
Short-term investments	0
Recurring | Level 3 | Commercial paper
Assets Measured on Recurring Basis
Short-term investments	$ 0

Prepaid Expenses and Other Cu_3

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid software subscriptions	$ 4,032	$ 3,239
Prepaid insurance	1,347	445
Prepaid hosting costs	1,211	486
Prepaid rent	867	657
Taxes	456	533
Short-term deposits	300	480
Prepaid employee-related costs	369	132
Capitalized offering costs	0	2,460
Other	613	870
Total	$ 9,195	$ 9,302

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 41,819	$ 28,755
Less accumulated depreciation and amortization	(23,431)	(18,551)
Total	18,388	10,204
Servers
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,520	11,283
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,776	6,885
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10,345	7,148
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,428	1,968
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,728	1,446
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 22	$ 25

Property and Equipment, Net - N

Property and Equipment, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Jan. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense related to property and equipment	$ 1.8	$ 1.2	$ 4.9	$ 3.7
Internal-use software
Property, Plant and Equipment [Line Items]
Capitalized internal-use software costs	4.3		4.3		$ 3.4
Internal-use software amortization	$ 0.4	$ 0.3	$ 1	$ 0.9

Purchased Intangible Assets - S

Purchased Intangible Assets - Summary of Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 14,539	$ 14,539
Accumulated Amortization	(4,994)	(3,247)
Net Carrying Amount	9,545	11,292
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,697	7,697
Accumulated Amortization	(3,759)	(2,666)
Net Carrying Amount	3,938	5,031
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,933	5,933
Accumulated Amortization	(1,051)	(494)
Net Carrying Amount	4,882	5,439
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	909	909
Accumulated Amortization	(184)	(87)
Net Carrying Amount	$ 725	$ 822

Purchased Intangible Assets - N

Purchased Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense related to purchased intangible assets	$ 0.5	$ 0.7	$ 1.7	$ 1.4

Accrued Expenses and Other Cu_3

Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Payables and Accruals [Abstract]
Accrued goods and services taxes	$ 3,135	$ 2,488
Accrued outside services and consulting	2,722	2,006
Employee early exercised stock options	670	556
Accrued sales and use tax liability	845	431
Deferred rent, current	297	604
Accrued legal fees	170	828
Accrued IPO-related costs	210	1,120
Accrued foreign income taxes	464	221
Accrued acquisition-related payments	0	12,558
Other accrued expenses	4,971	3,684
Total	$ 13,484	$ 24,496

Other Long-Term Liabilities - S

Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018
Other Long-Term Liabilities
Deferred rent, net of current portion	$ 2,149	$ 356
Long-term income taxes payable	426	472
Early exercised common stock options	253	139
Other	366	201
Total	$ 3,194	$ 1,168

Debt - Narrative (Details)

Debt - Narrative (Details) - Silicon Valley Bank Debt Agreement	1 Months Ended
	Oct. 31, 2018USD ($)payment	Jun. 30, 2017USD ($)	Sep. 30, 2018USD ($)
Line of Credit Facility [Line Items]
Variable interest rate basis	WSJ prime rate
Revolving Loan
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 30,000,000		$ 10,000,000
Credit facility expiration date	Oct. 31, 2021
Annual fee on revolving loan	$ 20,000
Amount drawn under credit facility	$ 0
Term Loan
Line of Credit Facility [Line Items]
Number of equal installment payments after interest-only period | payment	36
Frequency of periodic payment	Monthly
Credit facility expiration date	Jun. 30, 2022
Amount drawn under credit facility	$ 13,400,000
Proceeds from amounts borrowed		$ 15,000,000
Effective interest rate (percent)	4.25%
Duration of periodic payments due after interest-only period (in months)	36 months
Prepayment or termination fee (percent)	1.50%
Amount due per agreement upon prepayment or termination of facility	$ 225,000
Minimum
Line of Credit Facility [Line Items]
Adjusted quick ratio for debt agreement covenant	110.00%
WSJ Prime Rate
Line of Credit Facility [Line Items]
Basis spread on variable interest rate, minus (percent)	1.00%
WSJ Prime Rate | Revolving Loan
Line of Credit Facility [Line Items]
Basis spread on variable interest rate, minus (percent)	1.00%
WSJ Prime Rate | Term Loan
Line of Credit Facility [Line Items]
Basis spread on variable interest rate, minus (percent)	1.00%

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision		$ 225	$ 34	$ 616	$ 405
Loss before income taxes		$ (17,664)	$ (10,331)	$ (56,307)	$ (32,927)
Effective tax rates (percent)		(1.30%)	(0.30%)	(1.10%)	(1.20%)
Provisional adjustment to deferred tax assets related to Tax Cuts and Jobs Act	$ 30,000

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details)	1 Months Ended	9 Months Ended
	Apr. 30, 2018shares	Oct. 31, 2018vote$ / sharesshares
Class of Stock [Line Items]
Preferred stock issued (in shares)		0
Preferred stock outstanding (in shares)		0
Class A common stock
Class of Stock [Line Items]
Common stock authorized (in shares)		500,000,000
Common stock par value (in dollars per share) | $ / shares		$ 0.0001
Common stock issued (in shares)		72,600,000
Common stock outstanding (in shares)		72,600,000
Common stock voting rights		one vote per share
Number of votes for each share of stock held (in votes) | vote		1
Class B common stock
Class of Stock [Line Items]
Common stock issued upon conversion of convertible preferred stock (in shares)	62,000,000
Number of common shares issued for each share of convertible preferred stock (in shares)	1
Common stock authorized (in shares)		500,000,000
Common stock par value (in dollars per share) | $ / shares		$ 0.0001
Common stock issued (in shares)		35,800,000
Common stock outstanding (in shares)		35,800,000
Common stock voting rights		ten votes per share
Number of votes for each share of stock held (in votes) | vote		10

Stockholders' Equity - Componen

Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Components of Accumulated Other Comprehensive Income
Stockholders' equity, beginning balance			$ 26,666
Foreign currency translation adjustment	$ (681)	$ 73	(341)	$ 394
Unrealized loss on available-for-sale securities	(32)	$ 0	(32)	$ 0
Stockholders' equity, ending balance	156,594		156,594
AOCI
Components of Accumulated Other Comprehensive Income
Stockholders' equity, beginning balance			471
Stockholders' equity, ending balance	98		98
Foreign currency items
Components of Accumulated Other Comprehensive Income
Stockholders' equity, beginning balance			471
Stockholders' equity, ending balance	130		130
Unrealized loss on available-for-sale securities
Components of Accumulated Other Comprehensive Income
Stockholders' equity, beginning balance			0
Stockholders' equity, ending balance	$ (32)		$ (32)

Employee Stock Plans - Narrativ

Employee Stock Plans - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2018	Oct. 31, 2017	Mar. 31, 2018	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of options granted (in dollars per share)	$ 10.24	$ 6.80	$ 1.87
Aggregate intrinsic value of options exercised	$ 13.6	$ 31.5	$ 2.4
Liability related to early exercise of stock options	$ 0.9	$ 0.9			$ 0.7
Early exercise of stock options (in shares)	0.2	0.2			0.2
2018 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price, percentage of fair market value		85.00%
Unrecognized stock-based compensation expense related to ESPP	$ 4.9	$ 4.9
Class A common stock | 2018 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved and available for issuance (in shares)	9.1	9.1
Class A common stock | 2018 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved and available for issuance (in shares)				2.4
Stock Options and RSUs | 2006 Stock Plan and 2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate equity awards outstanding (in shares)	16	16
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 28.8	$ 28.8
Unrecognized compensation cost, recognition period		2 years 4 months 24 days
RSUs and Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 32.9	$ 32.9
Unrecognized compensation cost, recognition period		2 years 6 months

Employee Stock Plans - Schedule

Employee Stock Plans - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 31, 2018	Jan. 31, 2018
Shares Subject To Outstanding Stock Options
Outstanding, beginning balance (in shares)	15,401
Granted (in shares)	3,663
Exercised (in shares)	(2,913)
Forfeited (in shares)	(506)
Outstanding, ending balance (in shares)	15,645	15,401
Exercisable (in shares)	15,389
Vested and expected to vest (in shares)	14,977
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in dollars per share)	$ 3.56
Granted (in dollars per share)	8.41
Exercised (in dollars per share)	3.10
Forfeited (in dollars per share)	5.40
Weighted average exercise price, ending balance (in dollars per share)	4.72	$ 3.56
Exercisable (in dollars per share)	4.59
Vested and expected to vest (in dollars per share)	$ 4.64
Average Remaining Contractual Term (Years)
Average remaining contractual term (years), outstanding	7 years 8 months 23 days	7 years 10 months 28 days
Average remaining contractual term (years), exercisable	7 years 8 months 29 days
Average remaining contractual term (years), vested and expected to vest	7 years 8 months 5 days
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding	$ 245,957	$ 83,322
Aggregate intrinsic value, exercisable	243,660
Aggregate intrinsic value, vested and expected to vest	$ 236,536

Employee Stock Plans - Valuatio

Employee Stock Plans - Valuation Assumptions for Estimated Fair Value of Stock Options (Details) - Stock Options - $ / shares	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)	$ 27.86
Expected volatility	32.40%
Expected volatility, minimum		40.00%	39.20%	40.00%
Expected volatility, maximum		42.30%	40.90%	42.60%
Risk-free interest rate	2.82%
Risk-free interest rate, minimum		1.67%	2.62%	1.67%
Risk-free interest rate, maximum		2.18%	2.87%	2.26%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)		$ 5.54	$ 12.28	$ 3.28
Expected term (years)	5 years 10 months 25 days	4 years 3 months 19 days	5 years 1 month 6 days	4 years 3 months 19 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)		$ 5.88	$ 27.86	$ 5.88
Expected term (years)	6 years	6 years 10 months 25 days	6 years 4 months 24 days	7 years

Employee Stock Plans - Schedu_2

Employee Stock Plans - Schedule of RSU and Restricted Stock Award Activity (Details) - RSUs and Restricted Shares shares in Thousands	9 Months Ended
	Oct. 31, 2018$ / sharesshares
Number of RSU and Restricted Shares Outstanding
Outstanding, beginning balance (in shares) | shares	3,037
Granted (in shares) | shares	1,116
Vested (in shares) | shares	(1,028)
Forfeited (in shares) | shares	(64)
Outstanding, ending balance (in shares) | shares	3,061
Weighted-Average Grant Date Fair Value
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 5.37
Granted (in dollars per share) | $ / shares	26.25
Vested (in dollars per share) | $ / shares	5.47
Forfeited (in dollars per share) | $ / shares	12.77
Outstanding, ending balance (in dollars per share) | $ / shares	$ 12.80

Employee Stock Plans - Valuat_2

Employee Stock Plans - Valuation Assumptions for Estimated Fair Value of Employee Stock Purchase Plan (Details) - 2018 Employee Stock Purchase Plan	9 Months Ended
	Oct. 31, 2018$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of common stock (in dollars per share)	$ 14
Expected volatility, minimum	24.60%
Expected volatility, maximum	29.90%
Risk-free interest rate, minimum	2.01%
Risk-free interest rate, maximum	2.36%
Expected dividend yield	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	8 months 12 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	2 years 2 months 12 days

Employee Stock Plans - Schedu_3

Employee Stock Plans - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Cost of Revenue
Stock-based compensation expense	$ 7,459	$ 3,041	$ 17,722	$ 5,994
Cost of subscription revenue
Cost of Revenue
Stock-based compensation expense	555	239	1,311	490
Cost of professional services revenue
Cost of Revenue
Stock-based compensation expense	1,685	733	4,115	1,229
Research and development
Cost of Revenue
Stock-based compensation expense	1,902	729	4,366	1,537
Sales and marketing
Cost of Revenue
Stock-based compensation expense	2,205	1,012	5,317	1,975
General and administrative
Cost of Revenue
Stock-based compensation expense	$ 1,112	$ 328	$ 2,613	$ 763

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) ft² in Thousands, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2018USD ($)	Oct. 31, 2018USD ($)ft²vendor	Oct. 31, 2017USD ($)	Oct. 31, 2018USD ($)ft²vendor	Oct. 31, 2017USD ($)	Jan. 31, 2018USD ($)
Other Commitments [Line Items]
Deferred rent included in accrued expenses and other current liabilities and other long-term liabilities		$ 2.4		$ 2.4		$ 1
Rent expense		$ 2.8	$ 1.4	$ 7.2	$ 4.1
Capital Lease Agreements | Subsequent Event
Other Commitments [Line Items]
Previously issued letters of credit canceled	$ 4.3
Operating Lease Agreements
Other Commitments [Line Items]
Operating leases, area (sq ft) | ft²		155		155
Letters of credit outstanding		$ 2.1		$ 2.1
Operating Lease Agreements | Minimum
Other Commitments [Line Items]
Lease term (in years)				3 years
Operating Lease Agreements | Maximum
Other Commitments [Line Items]
Lease term (in years)				7 years
Web Hosting Services
Other Commitments [Line Items]
Contractual obligation		$ 11.3		$ 11.3
Number of vendors related to contractual obligation | vendor		1		1

Commitments and Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Oct. 31, 2018USD ($)
Capital Leases
Remainder of 2019	$ 2,287
2,020	0
2,021	0
2,022	0
2,023	0
Thereafter	0
Total future lease commitments	2,287
Operating Leases
Remainder of 2019	1,531
2,020	7,543
2,021	5,783
2,022	5,908
2,023	5,790
Thereafter	4,308
Total future lease commitments	$ 30,863

Net Loss Per Share Attributab_3

Net Loss Per Share Attributable to Common Stockholders - Narrative (Details)	Oct. 31, 2018vote
Class A common stock
Class of Stock [Line Items]
Number of votes for each share of stock held (in votes)	1
Class B common stock
Class of Stock [Line Items]
Number of votes for each share of stock held (in votes)	10

Net Loss Per Share Attributab_4

Net Loss Per Share Attributable to Common Stockholders - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Numerator:
Net loss	$ (17,889)	$ (10,365)	$ (56,923)	$ (33,332)
Denominator:
Weighted-average common shares outstanding, basic and diluted (in shares)	106,049	29,314	85,820	26,145
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.17)	$ (0.35)	$ (0.66)	$ (1.27)

Net Loss Per Share Attributab_5

Net Loss Per Share Attributable to Common Stockholders - Schedule of Potential Dilutive Securities Not Included in the Diluted Per Share Calculations (Details) - shares shares in Thousands	9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the diluted per share calculation	19,104	80,233
Conversion of convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the diluted per share calculation	0	61,984
Issued and outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the diluted per share calculation	15,645	14,971
Unvested restricted stock issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the diluted per share calculation	1,495	2,439
Unvested RSUs issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the diluted per share calculation	1,566	839
Shares committed under ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities not included in the diluted per share calculation	398	0

Related Party Transactions - Na

Related Party Transactions - Narrative (Details) - Employees shares in Millions, $ in Millions	6 Months Ended	10 Months Ended
	Apr. 30, 2018USD ($)employee	Aug. 31, 2018shares
Related Party Transaction [Line Items]
Payment for taxes owed in connection with restricted stock award | $	$ 5.6
Number of employees in related party agreement | employee	2
Promissory note receivable
Related Party Transaction [Line Items]
Shares of restricted common stock that secure promissory notes (in shares) | shares		4.6
Promissory note receivable | Minimum
Related Party Transaction [Line Items]
Promissory notes interest rate (percent)		1.85%
Promissory note receivable | Maximum
Related Party Transaction [Line Items]
Promissory notes interest rate (percent)		2.72%