MongoDB (MDB) 10-Q 7 Sep 18 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2018	Sep. 04, 2018
Document Information [Abstract]
Entity Registrant Name	MongoDB, Inc.
Entity Central Index Key	1,441,816
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jul. 31, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Class A Common Stock
Entity Common Stock, Shares Outstanding		31,495,992
Class B Common Stock
Entity Common Stock, Shares Outstanding		20,719,898

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 122,771	$ 61,902
Short-term investments	399,906	217,072
Accounts receivable, net of allowance for doubtful accounts of $1,651 and $1,238 as of July 31, 2018 and January 31, 2018, respectively	38,340	46,872
Deferred commissions	14,857	11,820
Prepaid expenses and other current assets	7,832	5,884
Total current assets	583,706	343,550
Property and equipment, net	70,374	59,557
Goodwill	1,700	1,700
Acquired intangible assets, net	1,185	1,627
Deferred tax assets	300	326
Other assets	6,665	8,436
Total assets	663,930	415,196
Current liabilities:
Accounts payable	2,256	2,261
Accrued compensation and benefits	14,981	17,433
Other accrued liabilities	13,473	8,423
Deferred revenue	125,526	114,500
Total current liabilities	156,236	142,617
Deferred rent, non-current	1,842	925
Deferred tax liability, non-current	39	18
Deferred revenue, non-current	20,235	22,930
Convertible senior notes, net	210,553	0
Other liabilities, non-current	66,401	55,213
Total liabilities	455,306	221,703
Commitments and contingencies (Note 5)
Stockholders’ equity:
Additional paid-in capital	714,401	638,680
Treasury stock, 99,371 shares (repurchased at an average of $13.27 per share) as of July 31, 2018 and January 31, 2018	(1,319)	(1,319)
Accumulated other comprehensive loss	(340)	(159)
Accumulated deficit	(504,170)	(443,760)
Total stockholders’ equity	208,624	193,493
Total liabilities and stockholders’ equity	663,930	415,196
Class A Common Stock
Stockholders’ equity:
Common stock	30	13
Class B Common Stock
Stockholders’ equity:
Common stock	$ 22	$ 38

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2018	Jan. 31, 2018
Current assets:
Allowance for doubtful accounts	$ 1,651	$ 1,238
Stockholders’ equity:
Treasury stock (in shares)	99,371	99,371
Average repurchase price of treasury stock shares (in dollars per share)	$ 13.27	$ 13.27
Class A Common Stock
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	1,000,000,000	1,000,000,000
Common stock issued (in shares)	29,991,734	13,303,028
Common stock outstanding (in shares)	29,991,734	13,303,028
Class B Common Stock
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	100,000,000	100,000,000
Common stock issued (in shares)	22,192,877	37,371,914
Common stock outstanding (in shares)	22,093,506	37,272,543

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenue:
Subscription	$ 52,933	$ 32,531	$ 97,498	$ 61,718
Services	4,557	3,069	8,214	6,272
Total revenue	57,490	35,600	105,712	67,990
Cost of revenue:
Subscription	12,116	7,215	22,186	13,765
Services	4,378	2,973	8,057	5,622
Total cost of revenue	16,494	10,188	30,243	19,387
Gross profit	40,996	25,412	75,469	48,603
Operating expenses:
Sales and marketing	37,880	26,892	71,769	49,037
Research and development	21,430	15,749	40,075	28,826
General and administrative	12,254	8,933	23,481	16,704
Total operating expenses	71,564	51,574	135,325	94,567
Loss from operations	(30,568)	(26,162)	(59,856)	(45,964)
Other income (expense):
Interest income	1,518	192	2,477	329
Interest expense	(1,294)	(8)	(1,294)	(8)
Other income (expense), net	(656)	151	(1,024)	355
Loss before provision for income taxes	(31,000)	(25,827)	(59,697)	(45,288)
Provision for income taxes	246	252	713	481
Net loss	$ (31,246)	$ (26,079)	$ (60,410)	$ (45,769)
Net loss per share, basic and diluted (in dollars per share)	$ (0.61)	$ (1.92)	$ (1.19)	$ (3.42)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	51,185,258	13,600,435	50,784,422	13,386,109

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (31,246)	$ (26,079)	$ (60,410)	$ (45,769)
Other comprehensive income (loss), net of tax:
Unrealized loss on available-for-sale securities	30	(28)	(52)	(37)
Foreign currency translation adjustments	(96)	93	(129)	160
Other comprehensive income (loss)	(66)	65	(181)	123
Total comprehensive loss	$ (31,312)	$ (26,014)	$ (60,591)	$ (45,646)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - 6 months ended Jul. 31, 2018 - USD ($) $ in Thousands	Total	Class A and Class B Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Jan. 31, 2018		50,575,571
Beginning balance at Jan. 31, 2018	$ 193,493	$ 51	$ 638,680	$ (1,319)	$ (159)	$ (443,760)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)	1,191,587	1,191,587
Stock option exercises	$ 8,078	$ 1	8,077
Repurchase of early exercised options (in shares)		(33,395)
Repurchase of early exercised options	0
Vesting of early exercised stock options	835		835
Vesting of restricted stock units (in shares)		75,603
Vesting of restricted stock units	0	$ 0	0
Stock-based compensation	16,586		16,586
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		275,874
Issuance of common stock under the Employee Stock Purchase Plan	5,626		5,626
Equity component of convertible senior notes	81,683		81,683
Purchase of capped calls	(37,086)		(37,086)
Unrealized gain on available-for-sale securities	(52)				(52)
Foreign currency translation adjustment	(129)				(129)
Net loss	(60,410)					(60,410)
Ending balance (in shares) at Jul. 31, 2018		52,085,240
Ending balance at Jul. 31, 2018	$ 208,624	$ 52	$ 714,401	$ (1,319)	$ (340)	$ (504,170)

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Cash flows from operating activities
Net loss	$ (60,410)	$ (45,769)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,623	1,860
Stock-based compensation	16,586	9,371
Amortization of debt discount and issuance costs	1,094	0
Deferred income taxes	47	62
Change in fair value of warrant liability	0	(101)
Change in operating assets and liabilities:
Accounts receivable	8,029	(1,646)
Prepaid expenses and other current assets	(1,910)	(2,942)
Deferred commissions	(1,320)	(369)
Other long-term assets	46	(634)
Accounts payable	(394)	12
Deferred rent	917	190
Accrued liabilities	1,957	1,245
Deferred revenue	8,834	11,852
Net cash used in operating activities	(24,901)	(26,869)
Cash flows from investing activities
Purchases of property and equipment	(1,561)	(1,626)
Proceeds from maturities of marketable securities	118,000	64,230
Purchases of marketable securities	(300,467)	(68,754)
Net cash used in investing activities	(184,028)	(6,150)
Cash flows from financing activities
Proceeds from exercise of stock options, including early exercised stock options	8,106	5,984
Proceeds from the issuance of common stock under the Employee Stock Purchase Plan	5,626	0
Repurchase of early exercised stock options	(309)	(74)
Proceeds from borrowings on convertible senior notes, net of issuance costs	293,161	0
Payment for purchase of capped calls	(37,086)	0
Proceeds from tenant improvement allowance on build-to-suit lease	376	0
Proceeds from exercise of redeemable convertible preferred stock warrants	0	1
Payment of initial public offering costs	0	(1,177)
Net cash provided by financing activities	269,874	4,734
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(83)	160
Net increase (decrease) in cash, cash equivalents, and restricted cash	60,862	(28,125)
Cash, cash equivalents, and restricted cash, beginning of period	62,427	69,412
Cash, cash equivalents, and restricted cash, end of period	123,289	41,287
Supplemental cash flow disclosure of noncash investing and financing activities
Vesting of early exercised stock options	835	495
Costs related to initial public offering included in accounts payable and accrued liabilities	0	1,608
Conversion of redeemable convertible preferred stock warrant liability to redeemable convertible preferred stock as a result of warrant exercise	0	1,170
Costs related to issuance of convertible senior notes included in accounts payable and accrued liabilities	2,018	0
Purchases of property and equipment included in accounts payable and accrued liabilities	314	0
Construction in progress related to build-to-suit lease obligations	10,781	0
Reconciliation of cash, cash equivalents, and restricted cash within the condensed consolidated balance sheets, end of period, to the amounts shown in the statements of cash flows above:
Total cash, cash equivalents and restricted cash	$ 62,427	$ 69,412

Organization and Description of

Organization and Description of Business	6 Months Ended
	Jul. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business MongoDB, Inc. (“MongoDB” or the “Company”) was originally incorporated in the state of Delaware in November 2007 under the name 10Gen, Inc. In August 2013, the Company changed its name to MongoDB, Inc. The Company is headquartered in New York City. MongoDB is the leading, modern, general purpose database platform. The Company’s robust platform enables developers to build and modernize applications rapidly and cost-effectively across a broad range of use cases. Organizations can deploy the Company’s platform at scale in the cloud, on-premise, or in a hybrid environment. In addition to selling its software, the Company provides post-contract support, training, and consulting services for its offerings. The Company’s fiscal year ends January 31 .

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jul. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying interim condensed consolidated balance sheet and interim condensed consolidated statement of stockholders’ equity as of July 31, 2018 , the interim condensed consolidated statements of operations and of comprehensive loss for the three and six months ended July 31, 2018 and 2017 and the interim condensed consolidated statement of cash flows for the six months ended July 31, 2018 and 2017 , are unaudited. The interim unaudited condensed consolidated financial statements have been prepared on a basis consistent with the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s financial position and its statement of stockholders’ equity as of July 31, 2018 , its results of operations and of comprehensive loss for the three and six months ended July 31, 2018 and 2017 , and its statement of cash flows for the six months ended July 31, 2018 and 2017 . The financial data and the other financial information disclosed in the notes to these interim condensed consolidated financial statements related to the six -month periods are also unaudited. The results of operations for the six months ended July 31, 2018 are not necessarily indicative of the results to be expected for the fiscal year ending January 31, 2019 or for any other future year or interim period. The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). The condensed balance sheet data as of January 31, 2018 was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. Therefore, these interim unaudited condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company’s annual consolidated financial statements and related footnotes included in its Annual Report on Form 10-K for the fiscal year ended January 31, 2018 (the “2018 Form 10-K”). Use of Estimates The preparation of the interim unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, revenue recognition, allowances for doubtful accounts, stock-based compensation, legal contingencies, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, fair value of property and equipment and accounting for income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events. Actual results could differ from those estimates. Emerging Growth Company Status As an “emerging growth company” (“EGC”), the Jump-start Our Business Start-ups Act (“JOBS Act”), allows the 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. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make the Company’s common stock less attractive to investors. As a result of its market capitalization as of July 31, 2018, the Company expects that it will cease to qualify as an EGC as of January 31, 2019 and will no longer be able to take advantage of the extended transition period. Significant Accounting Policies There have been no changes to the Company’s significant accounting policies described in the Company’s 2018 Form 10-K. Related Party Transactions All contracts with related parties are executed in ordinary course of business. There were no material related party transactions in the three and six months ended July 31, 2018 and 2017 . As of July 31, 2018 and January 31, 2018 , there were no material amounts payable to or amounts receivable from related parties. New Accounting Pronouncements Not Yet Adopted Goodwill Impairment. In January 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-04— Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard will simplify the measurement of goodwill by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for the Company for the fiscal year ending January 31, 2021, though early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements. Leases. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which modifies lease accounting for lessees to increase transparency and comparability by recording lease assets and liabilities for operating leases and disclosing key information about leasing arrangements. Since the Company anticipates losing its EGC status as of January 31, 2019, it expects to adopt the new lease standard for its interim results for the period ending April 30, 2019, though early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements. Revenue Recognition. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which amends the existing accounting standard for revenue recognition. ASU 2014-09 is based on principles that govern the recognition of revenue at an amount to which an entity expects to be entitled when products are transferred to customers. Subsequently, the FASB has issued the following pronouncements related to ASU 2014-09: ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ; ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ; and ASU 2016-20, Technical Corrections and Improvements to Topic 606 , which clarifies narrow aspects of ASC 606 or corrects unintended application of the guidance. The Company must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 with ASU 2014-09 (collectively, the “new revenue standard”). The Company currently plans to adopt the new revenue standard using the full retrospective transition method for its annual results for the fiscal year ending January 31, 2019. While the Company continues to assess the potential impacts of the new revenue standard, the Company currently expects unearned subscription revenue to decline upon adoption. Currently, as the Company’s subscription offerings include software term licenses and post-contract customer support for which the Company has not established vendor specific objective evidence (“VSOE”), the entire subscription fee is recognized ratably over the term of the contract. However, under the new revenue standard, the requirement for VSOE for undelivered elements is eliminated and, as a result, the Company is required to identify all performance obligations in a contract and recognize revenue based on each performance obligation separately. The Company currently expects that the portion related to the software term license deliverable will be recognized upon delivery, which may result in greater fluctuations in its consolidated financial statements. The Company is in the process of determining the revenue recognition impact for the other deliverables of each contract. The Company continues to evaluate the effect that the new revenue standard will have on its consolidated financial statements and related disclosures. Its preliminary assessments, including whether the Company will use the full retrospective or the modified retrospective transition method, are subject to change.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jul. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of July 31, 2018 and January 31, 2018 , and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands): Fair Value Measurement at July 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets: Cash and cash equivalents: Money market funds $ 92,173 $ — $ — $ 92,173 Short-term investments: U.S. government treasury securities 399,906 — — 399,906 Total financial assets $ 492,079 $ — $ — $ 492,079 Fair Value Measurement at January 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets: Cash and cash equivalents: Money market funds $ 45,918 $ — $ — $ 45,918 Short-term investments: U.S. government treasury securities 217,072 — — 217,072 Total financial assets $ 262,990 $ — $ — $ 262,990 The Company utilized the market approach and Level 1 valuation inputs to value its money market mutual funds and U.S. government treasury securities because published net asset values were readily available. As of July 31, 2018 and January 31, 2018 , gross unrealized gains and unrealized losses for cash equivalents and short-term investments were not material, and the contractual maturity of all marketable securities was less than one year. In addition to its cash, cash equivalents and short-term investments, the Company measures the fair value of its outstanding Notes (as defined below) on a quarterly basis for disclosure purposes. The Company considers the fair value of the Notes at July 31, 2018 to be a Level 2 measurement due to limited trading activity of the Notes. Refer to Note 4, Convertible Senior Notes , to the condensed consolidated financial statements for further details.

Convertible Senior Notes

Convertible Senior Notes	6 Months Ended
	Jul. 31, 2018
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes In June 2018, the Company issued $250.0 million aggregate principal amount of 0.75% convertible senior notes due 2024 (the “Notes”) in a private placement and, in July 2018, the Company issued an additional $50.0 million aggregate principal amount of the Notes pursuant to the exercise in full of the initial purchasers’ option to purchase additional Notes. The Notes are senior unsecured obligations of MongoDB and interest is payable semiannually in arrears on June 15 and December 15 of each year, beginning on December 15, 2018, at a rate of 0.75% per year. The Notes will mature on June 15, 2024, unless earlier converted, redeemed or repurchased. The total net proceeds from the offering, after deducting initial purchase discounts and estimated debt issuance costs, were approximately $291.1 million . The initial conversion rate is 14.6738 shares of MongoDB’s Class A common stock per $1,000 principal amount of Notes, which is equal to an initial conversion price of approximately $68.15 per share of Class A common stock, subject to adjustment upon the occurrence of specified events. The Notes will be convertible at the option of the holders at any time prior to the close of business on the business day immediately preceding March 15, 2024, only under the following circumstances: (1) during any fiscal quarter commencing after the fiscal quarter ending on October 31, 2018 (and only during such fiscal quarter), if the last reported sale price of the Company’s Class A common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding fiscal quarter is greater than or equal to 130% of the conversion price of the Notes on each applicable trading day; (2) during the five -business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s Class A common stock and the conversion rate of the Notes on each such trading day; (3) if the Company calls any or all of the Notes for redemption, at any time prior to the close of business on the scheduled trading day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events (as set forth in the indenture governing the Notes). On or after March 15, 2024, until the close of business on the scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their Notes, in multiples of $1,000 principal amount, at the option of the holder, regardless of the foregoing circumstances. Upon conversion, the Company will satisfy its conversion obligation by paying or delivering, as the case may be, cash, shares of the Company’s Class A common stock or a combination of cash and shares of the Company’s Class A common stock, at the Company’s election. If a fundamental change (as defined in the indenture governing the Notes) occurs prior to the maturity date, holders of the Notes will have the right to require the Company to repurchase for cash all or any portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date. In addition, if specific corporate events occur prior to the applicable maturity date, or if the Company elects to redeem the Notes, the Company will increase the conversion rate for a holder who elects to convert their notes in connection with such a corporate event or redemption in certain circumstances. It is the Company’s current intent to settle the principal amount of the Notes in cash. During the three months ended July 31, 2018, the conditions allowing holders of the Notes to convert have not been met. The Notes were therefore not convertible during the three months ended July 31, 2018 and were classified as long-term debt on the Company’s condensed consolidated balance sheets. The Company may not redeem the Notes prior to June 20, 2021. On or after June 20, 2021, the Company may redeem for cash all or any portion of the Notes, at its option, if the last reported sale price of its Class A common stock was at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending on, and including, the trading day immediately preceding the date on which the Company provides a notice of redemption at a redemption price equal to 100% of the principal amount of the Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. In accounting for the issuance of the Notes, the Notes were separated into liability and equity components. The carrying amounts of the liability component was calculated by measuring the fair value of similar liabilities that do not have associated convertible features. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the respective Notes. This difference represents the debt discount that is amortized to interest expense over the respective terms of the Notes using the effective interest rate method. The carrying amount of the equity component representing the conversion option was $84.2 million . The equity component was recorded in additional paid-in capital and is not remeasured as long as it continues to meet the conditions for equity classification. In accounting for the debt issuance costs of $8.8 million related to the Notes, the Company allocated the total amount incurred to the liability and equity components of the Notes based on their relative values. Issuance costs attributable to the liability component were $6.3 million and will be amortized, along with the debt discount, to interest expense over the contractual term of the Notes at an effective interest rate of 7.03% . Issuance costs attributable to the equity component were $2.5 million and are netted against the equity component representing the conversion option in additional paid-in capital. The net carrying amount of the liability component of the Notes was as follows (in thousands): July 31, 2018 Principal $ 300,000 Unamortized debt discount (83,135 ) Unamortized debt issuance costs (6,312 ) Net carrying amount $ 210,553 The net carrying amount of the equity component of the Notes was as follows (in thousands): July 31, 2018 Debt discount for conversion option $ 84,168 Issuance costs (2,485 ) Net carrying amount $ 81,683 As of July 31, 2018, the total estimated fair value of the Notes was approximately $308.9 million . The fair value was determined based on the closing trading price per $100 of the Notes as of the last day of trading for the period. The fair value of the Notes is primarily affected by the trading price of the Company’s common stock and market interest rates. The following table sets forth the interest expense related to the Notes (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Contractual interest expense $ 200 $ — $ 200 $ — Amortization of debt discount 1,034 — 1,034 — Amortization of issuance costs 60 — 60 — Total $ 1,294 $ — $ 1,294 $ — Capped Calls In connection with the pricing of the Notes, the Company entered into privately negotiated capped call transactions with certain counterparties (“Capped Calls”). The Capped Calls each have an initial strike price of approximately $68.15 per share, subject to certain adjustments, which corresponds to the initial conversion price of the Notes. The Capped Calls have initial cap prices of $106.90 per share, subject to certain adjustments. The Capped Calls are expected to partially offset the potential dilution to the Company’s Class A common stock upon any conversion of the Notes, with such offset subject to a cap based on the cap price. The Capped Calls cover, subject to anti-dilution adjustments, approximately 4.4 million shares of the Company’s Class A common stock. The Capped Calls are subject to adjustment upon the occurrence of specified extraordinary events affecting the Company, including merger events, a tender offers and announcement events. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including nationalization, insolvency or delisting, changes in law, failures to deliver, insolvency filings and hedging disruptions. For accounting purposes, the Capped Calls are separate transactions, and not part of the terms of the Notes. As these transactions meet certain accounting criteria, the Capped Calls are recorded in stockholders' equity and are not accounted for as derivatives. The cost of $37.1 million incurred to purchase the Capped Calls was recorded as a reduction to additional paid-in capital and will not be remeasured.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases The Company has entered into non-cancelable operating leases, primarily related to rental of office space expiring through 2029. The Company recognizes operating lease costs on a straight-line basis over the term of the agreement, taking into account adjustments for market provisions such as free or escalating base monthly rental payments or deferred payment terms such as rent holidays that defer the commencement date of the required payments. The Company may receive renewal or expansion options, leasehold improvement allowances or other incentives on certain lease agreements. Total rent expense related to operating leases was $3.1 million and $2.1 million for the three months ended July 31, 2018 and 2017, respectively, and $6.2 million and $4.2 million for the six months ended July 31, 2018 and 2017 , respectively. Other Commitments During the six months ended July 31, 2018 , other than the issuance of the Notes, there have been no material changes outside the ordinary course of business to the Company’s contractual obligations and commitments from those disclosed in the 2018 Form 10-K. Refer to Note 4, Convertible Senior Notes , to the condensed consolidated financial statements for further details. Legal Matters From time to time, the Company has become involved in claims and other legal matters arising in the ordinary course of business. The Company investigates these claims as they arise. Although claims are inherently unpredictable, the Company is currently not aware of any matters that, if determined adversely to the Company, would individually or taken together have a material adverse effect on its business, financial position, results of operations or cash flows. The Company accrues estimates for resolution of legal and other contingencies when losses are probable and estimable. From time to time, the Company is a party to litigation and subject to claims and threatened claims incident to the ordinary course of business, including intellectual property claims, labor and employment claims, breach of contract claims, and other matters. Although the results of litigation and claims are inherently unpredictable, the Company believes that there was not at least a reasonable possibility that the Company had incurred a material loss with respect to such loss contingencies, as of July 31, 2018 and January 31, 2018 , therefore, the Company has no t recorded an accrual for such contingencies. Indemnification The Company enters into indemnification provisions under its agreements with other companies in the ordinary course of business, including customers, business partners, landlords, contractors and parties performing its research and development. Pursuant to these arrangements, the Company agrees to indemnify, hold harmless, and reimburse the indemnified party for certain losses suffered or incurred by the indemnified party as a result of the Company’s activities. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements. As a result, the Company believes the fair value of these agreements is not material. The Company maintains commercial general liability insurance and product liability insurance to offset certain of the Company’s potential liabilities under these indemnification provisions. The Company has entered into indemnification agreements with each of its directors and executive officers. These agreements require the Company to indemnify such individuals, to the fullest extent permitted by Delaware law, for certain liabilities to which they may become subject as a result of their affiliation with the Company.

Equity Incentive Plans and Empl

Equity Incentive Plans and Employee Stock Purchase Plan	6 Months Ended
	Jul. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plans and Employee Stock Purchase Plan	Equity Incentive Plans and Employee Stock Purchase Plan Equity Incentive Plans The Company adopted the 2008 Stock Incentive Plan (as amended, the “2008 Plan”) in 2008 and the 2016 Equity Incentive Plan (as amended, the “2016 Plan”) in 2016, primarily for the purpose of granting stock-based awards to employees, directors, and consultants. With the establishment of the 2016 Plan in December 2016, all shares available for grant under the 2008 Plan were transferred to the 2016 Plan. The Company no longer grants any stock-based awards under the 2008 Plan and any shares underlying stock options canceled under the 2008 Plan will be automatically transferred to the 2016 Plan. Stock Options The 2016 Plan provides for the issuance of incentive stock options to employees and nonstatutory stock options to employees, directors or consultants. The Board of Directors or a committee thereof determines the vesting schedule for all equity awards. Stock option awards generally vest over a period of four years with 25% vesting on the one-year anniversary of the award and the remainder vesting monthly over the next 36 months of the grantee’s service to the Company. The following table summarizes stock option activity for the six months ended July 31, 2018 (in thousands, except share and per share data and years): Shares Weighted- Weighted- Aggregate Balance - January 31, 2018 12,637,435 $ 7.63 7.72 $ 246,227 Stock options granted — — Stock options exercised (1,191,587 ) 6.78 Stock options forfeited and expired (519,506 ) 8.25 Balance - July 31, 2018 10,926,342 7.69 7.22 507,216 Vested and exercisable - January 31, 2018 5,540,858 6.33 6.63 115,122 Vested and exercisable - July 31, 2018 5,948,032 $ 6.62 6.42 $ 282,477 Restricted Stock Units The 2016 Plan provides for the issuance of restricted stock units (“RSUs”) to employees, directors and consultants. RSUs granted to new employees generally vest over a period of four years with 25% vesting on the one-year anniversary of the vesting start date and the remainder vesting quarterly over the next 12 quarters, subject to the grantee’s continued service to the Company. RSUs granted to existing employees generally vest quarterly over a period of four years , subject to the grantee’s continued service to the Company. The following table summarizes RSU activity for the six months ended July 31, 2018 : Shares Weighted-Average Grant Date Fair Value per RSU Unvested - January 31, 2018 245,746 $ 26.20 RSUs granted 1,351,332 41.38 RSUs vested (75,603 ) 50.34 RSUs forfeited and canceled (30,327 ) 34.96 Unvested - July 31, 2018 1,491,148 $ 38.56 Employee Stock Purchase Plan In October 2017, the Board of Directors adopted, and stockholders approved, the 2017 Employee Stock Purchase Plan (“ESPP”). A total of 1.5 million shares of the Company’s Class A common stock have been authorized for issuance under the 2017 ESPP. Subject to any plan limitations, the 2017 ESPP allows eligible employees to contribute, normally through payroll deductions, up to 15% of their earnings for the purchase of the Company’s Class A common stock at a discounted price per share. Except for the initial offering period, the ESPP provides for separate six -month offering periods. The initial offering period began October 18, 2017 and ended June 15, 2018. During the three months ended July 31, 2018, the Company issued 275,874 shares of Class A common stock under the 2017 ESPP. Unless otherwise determined by the Board of Directors or a committee thereof, the Company’s Class A common stock will be purchased for the accounts of employees participating in the ESPP at a price per share that is the lesser of (1) 85% of the fair market value of the Company’s Class A common stock on the first trading day of the offering period, which for the initial offering period is the price at which shares of the Company’s Class A common stock were first sold to the public, or (2) 85% of the fair market value of the Company’s Class A common stock on the last trading day of the offering period. Stock-Based Compensation Expense Total stock-based compensation expense recognized in the Company’s interim unaudited condensed consolidated statements of operations is as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Cost of revenue—subscription $489 $170 $ 848 $ 321 Cost of revenue—services 281 98 465 170 Sales and marketing 2,129 1,482 4,347 2,697 Research and development 2,904 1,322 5,110 2,567 General and administrative 3,206 1,845 5,816 3,616 Total stock-based compensation expense $ 9,009 $ 4,917 $ 16,586 $ 9,371

Net Loss per Share

Net Loss per Share	6 Months Ended
	Jul. 31, 2018
Earnings Per Share [Abstract]
Net Loss per Share	Net Loss per Share The Company calculates basic net loss per share by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. Diluted net loss per share is computed by giving effect to all potentially dilutive common stock equivalents outstanding for the period, including stock options and restricted stock units. Prior to the Company’s closing of its initial public offering in October 2017, the Company calculated basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for companies with participating securities. The Company considered all series of redeemable convertible preferred stock to have been participating securities as the holders were entitled to receive non-cumulative dividends on a pari passu basis in the event that a dividend had been paid on common stock. For further details on the Company’s historical participating securities, including warrants to purchase redeemable convertible preferred stock and common stock, refer to the Company’s 2018 Form 10-K, specifically in Part II, Item 8, Financial Statements and Supplementary Data under the Notes to Consolidated Financial Statements. Under the two-class method, basic net loss per share attributable to common stockholders was calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. The net loss attributable to common stockholders was not allocated to the redeemable convertible preferred stock as the holders of redeemable convertible preferred stock did not have a contractual obligation to share in losses. Diluted net loss per share attributable to common stockholders was computed by giving effect to all potentially dilutive common stock equivalents outstanding for the period. For purposes of this calculation, redeemable convertible preferred stock, stock options to purchase common stock, early exercised stock options, and warrants to purchase redeemable convertible preferred stock and common stock were considered common shares equivalents, but had been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect was antidilutive. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been antidilutive due to the net loss reported for each period presented. The rights, including the liquidation and dividend rights, of the holders of Class A and Class B common stock are identical, except with respect to voting. 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 10 votes per share. As the liquidation and dividend rights are identical for Class A and Class B common stock, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis. The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Numerator: Net loss $ (31,246 ) $ (26,079 ) $ (60,410 ) $ (45,769 ) Denominator: Weighted-average shares used to compute net loss per share, basic and diluted 51,185,258 13,600,435 50,784,422 13,386,109 Net loss per share, basic and diluted $ (0.61 ) $ (1.92 ) $ (1.19 ) $ (3.42 ) The shares underlying the conversion option in the Notes were not considered in the calculation of diluted net loss per share as the effect would have been anti-dilutive. Additionally, the Notes were not convertible as of July 31, 2018. The Company expects to settle the principal amount of the Notes in cash and therefore uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. The conversion spread will have a dilutive impact on diluted net income per share when the average market price of the Company’s Class A common stock for a given period exceeds the initial conversion price of $68.15 per share for the Notes, which did not occur as of July 31, 2018. In connection with the issuance of the Notes, the Company entered into Capped Calls, which were not included for purposes of calculating the number of diluted shares outstanding, as their effect would have been anti-dilutive. The Capped Calls are expected to partially offset the potential dilution to the Company’s Class A common stock upon any conversion of the Notes. The following weighted-average outstanding potentially dilutive common shares were excluded from the computation of diluted net loss per share for the periods presented because the impact of including them would have been antidilutive: Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Redeemable convertible preferred stock (as converted) — 26,920,022 — 26,910,099 Redeemable convertible preferred stock warrants (as converted) — 34,424 — 44,514 Common stock warrants — 122,043 — 122,043 Stock options to purchase Class A common stock 3,361,686 2,453,654 3,450,512 1,681,243 Stock options to purchase Class B common stock 8,271,986 9,689,809 8,636,638 10,015,105 Unvested restricted stock units 1,441,964 — 1,044,241 — Early exercised stock options 132,297 268,516 172,778 199,722

Income Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded a provision for income taxes of $0.2 million and $0.3 million for the three months ended July 31, 2018 and 2017, respectively, and $0.7 million and $0.5 million for the six months ended July 31, 2018 and 2017 , respectively. The provision for income taxes was primarily due to foreign taxes. The provision for income taxes is based upon the estimated annual effective tax rates for the year applied to the current period income (loss) before tax plus the tax effect of any significant unusual items, discrete events or changes in tax law. On December 22, 2017, the 2017 Tax Cuts and Jobs Act (the “Tax Act”) was enacted into law and the new legislation significantly revised the Internal Revenue Code of 1986, as amended. The newly enacted federal income tax law, among other things, contains significant changes to corporate taxation, including the reduction of the corporate tax rate from a top marginal rate of 35% to a flat rate of 21%, limitation of the deduction for newly generated net operating losses (“NOLs”) to 80% of current year taxable income and elimination of NOL carrybacks and one-time taxation of offshore earnings at reduced rates regardless of whether they are repatriated. The Company is required to recognize the effect of these significant tax law changes in the period of enactment. Also on December 22, 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. Given the significant complexity of the Tax Act, anticipated guidance from the Internal Revenue Service about implementing the Tax Act, and the potential for additional guidance from the SEC or the FASB related to the Tax Act, the Company’s current estimates may be adjusted in future periods. The Company expects to complete its analysis within the measurement period in accordance with SAB 118. Any subsequent adjustments to current estimates will be recorded to tax expense during the quarter in the Company’s fiscal year ending January 31, 2019 in which the Company’s analysis of and accounting for the Tax Act is complete. The Company has not recorded any further adjustments during the six months ended July 31, 2018 . For information on the Company’s initial provisional estimates recorded during the year ended January 31, 2018, refer to the Company’s 2018 Form 10-K, specifically Part II, Item 8, Financial Statements and Supplementary Data under Note 11, Income Taxes , in the Notes to Consolidated Financial Statements. For the Global Intangible Low-Taxed Income (“GILTI”) provisions of the Tax Act, the Company has not yet completed its assessment or elected an accounting policy to either recognize deferred taxes for basis differences expected to reverse as GILTI or to record GILTI as period costs if and when incurred. The Company assesses uncertain tax positions in accordance with ASC 740-10, Accounting for Uncertainties in Tax . As of July 31, 2018 , the Company’s net unrecognized tax benefits totaled $4.3 million , none of which would impact the Company’s effective tax rate if recognized. The Company anticipates that the amount of reasonably possible unrecognized tax benefits that could decrease over the next 12 months due to the expiration of certain statutes of limitations and settlement of tax audits is no t material to the Company’s interim unaudited condensed consolidated financial statements.

Segments and Geographic Revenue

Segments and Geographic Revenue	6 Months Ended
	Jul. 31, 2018
Segment Reporting [Abstract]
Segments and Geographic Revenue	Segments and Geographic Revenue The Company operates its business as one operating segment as it only reports financial information on an aggregate and consolidated basis to the Chief Executive Officer, who is the Company’s chief operating decision maker. The following table sets forth the Company’s total revenue by geographic area based on the customers’ location (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Americas $ 38,313 $ 24,518 $ 69,588 $ 46,920 Europe, Middle East and Africa 16,215 9,993 30,615 18,922 Asia Pacific 2,962 1,089 5,509 2,148 Total $ 57,490 $ 35,600 $ 105,712 $ 67,990 Customers located in the United States accounted for 63% and 65% of total revenue for the three months ended July 31, 2018 and 2017 , respectively, and 62% and 65% of total revenue for the six months ended July 31, 2018 and 2017 , respectively. Customers located in the United Kingdom accounted for 10% of total revenue for each of the three and six months ended July 31, 2018 and 2017 , respectively. No other country accounted for 10% or more of revenue for the periods presented. As of July 31, 2018 and January 31, 2018 , substantially all of the Company’s long-lived assets were located in the United States.

Subsequent Events

Subsequent Events	6 Months Ended
	Jul. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events In December 2017, the Company entered into a lease agreement for 106,230 rentable square feet of office space (the “Premises”) to accommodate its growing employee base in New York City. The Company received delivery of the Premises on January 1, 2018 to commence construction to renovate the Premises and expects to vacate its current office space prior to the expiration of its existing lease in December 2018. As a result of the Company’s involvement during the construction period, whereby the Company has certain indemnification obligations related to the construction, the Company is considered, for accounting purposes only, the owner of the construction project under build-to-suit lease accounting. On September 4, 2018, construction of the Premises was completed, although the Company has not fully vacated its existing office space. For the reporting period ending October 31, 2018, the Company will determine whether or not the lease for the Premises meets the criteria for “sale-leaseback” treatment.

Summary of Significant Accoun18

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jul. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). The condensed balance sheet data as of January 31, 2018 was derived from the Company’s audited financial statements, but does not include all disclosures required by U.S. GAAP. Therefore, these interim unaudited condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company’s annual consolidated financial statements and related footnotes included in its Annual Report on Form 10-K for the fiscal year ended January 31, 2018 (the “2018 Form 10-K”).
Use of Estimates	The preparation of the interim unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, revenue recognition, allowances for doubtful accounts, stock-based compensation, legal contingencies, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, fair value of property and equipment and accounting for income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events. Actual results could differ from those estimates.
Emerging Growth Company Status	As an “emerging growth company” (“EGC”), the Jump-start Our Business Start-ups Act (“JOBS Act”), allows the 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. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make the Company’s common stock less attractive to investors. As a result of its market capitalization as of July 31, 2018, the Company expects that it will cease to qualify as an EGC as of January 31, 2019 and will no longer be able to take advantage of the extended transition period.
Related Party Transactions	All contracts with related parties are executed in ordinary course of business.
New Accounting Pronouncements Not Yet Adopted	Goodwill Impairment. In January 2017, the Financial Accounting Standards Board (“FASB”) issued ASU 2017-04— Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard will simplify the measurement of goodwill by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for the Company for the fiscal year ending January 31, 2021, though early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements. Leases. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which modifies lease accounting for lessees to increase transparency and comparability by recording lease assets and liabilities for operating leases and disclosing key information about leasing arrangements. Since the Company anticipates losing its EGC status as of January 31, 2019, it expects to adopt the new lease standard for its interim results for the period ending April 30, 2019, though early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements. Revenue Recognition. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which amends the existing accounting standard for revenue recognition. ASU 2014-09 is based on principles that govern the recognition of revenue at an amount to which an entity expects to be entitled when products are transferred to customers. Subsequently, the FASB has issued the following pronouncements related to ASU 2014-09: ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations ; ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing ; ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients ; and ASU 2016-20, Technical Corrections and Improvements to Topic 606 , which clarifies narrow aspects of ASC 606 or corrects unintended application of the guidance. The Company must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 with ASU 2014-09 (collectively, the “new revenue standard”). The Company currently plans to adopt the new revenue standard using the full retrospective transition method for its annual results for the fiscal year ending January 31, 2019. While the Company continues to assess the potential impacts of the new revenue standard, the Company currently expects unearned subscription revenue to decline upon adoption. Currently, as the Company’s subscription offerings include software term licenses and post-contract customer support for which the Company has not established vendor specific objective evidence (“VSOE”), the entire subscription fee is recognized ratably over the term of the contract. However, under the new revenue standard, the requirement for VSOE for undelivered elements is eliminated and, as a result, the Company is required to identify all performance obligations in a contract and recognize revenue based on each performance obligation separately. The Company currently expects that the portion related to the software term license deliverable will be recognized upon delivery, which may result in greater fluctuations in its consolidated financial statements. The Company is in the process of determining the revenue recognition impact for the other deliverables of each contract. The Company continues to evaluate the effect that the new revenue standard will have on its consolidated financial statements and related disclosures. Its preliminary assessments, including whether the Company will use the full retrospective or the modified retrospective transition method, are subject to change.
Net Loss per Share	The Company calculates basic net loss per share by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. Diluted net loss per share is computed by giving effect to all potentially dilutive common stock equivalents outstanding for the period, including stock options and restricted stock units. Prior to the Company’s closing of its initial public offering in October 2017, the Company calculated basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for companies with participating securities. The Company considered all series of redeemable convertible preferred stock to have been participating securities as the holders were entitled to receive non-cumulative dividends on a pari passu basis in the event that a dividend had been paid on common stock. For further details on the Company’s historical participating securities, including warrants to purchase redeemable convertible preferred stock and common stock, refer to the Company’s 2018 Form 10-K, specifically in Part II, Item 8, Financial Statements and Supplementary Data under the Notes to Consolidated Financial Statements. Under the two-class method, basic net loss per share attributable to common stockholders was calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less shares subject to repurchase. The net loss attributable to common stockholders was not allocated to the redeemable convertible preferred stock as the holders of redeemable convertible preferred stock did not have a contractual obligation to share in losses. Diluted net loss per share attributable to common stockholders was computed by giving effect to all potentially dilutive common stock equivalents outstanding for the period. For purposes of this calculation, redeemable convertible preferred stock, stock options to purchase common stock, early exercised stock options, and warrants to purchase redeemable convertible preferred stock and common stock were considered common shares equivalents, but had been excluded from the calculation of diluted net loss per share attributable to common stockholders as their effect was antidilutive. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been antidilutive due to the net loss reported for each period presented. The rights, including the liquidation and dividend rights, of the holders of Class A and Class B common stock are identical, except with respect to voting. 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 10 votes per share. As the liquidation and dividend rights are identical for Class A and Class B common stock, the undistributed earnings are allocated on a proportionate basis and the resulting net loss per share will, therefore, be the same for both Class A and Class B common stock on an individual or combined basis.
Income Taxes	The Company assesses uncertain tax positions in accordance with ASC 740-10, Accounting for Uncertainties in Tax .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of financial assets and liabilities measured at fair value on a recurring basis	The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of July 31, 2018 and January 31, 2018 , and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands): Fair Value Measurement at July 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets: Cash and cash equivalents: Money market funds $ 92,173 $ — $ — $ 92,173 Short-term investments: U.S. government treasury securities 399,906 — — 399,906 Total financial assets $ 492,079 $ — $ — $ 492,079 Fair Value Measurement at January 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets: Cash and cash equivalents: Money market funds $ 45,918 $ — $ — $ 45,918 Short-term investments: U.S. government treasury securities 217,072 — — 217,072 Total financial assets $ 262,990 $ — $ — $ 262,990

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	6 Months Ended
	Jul. 31, 2018
Debt Disclosure [Abstract]
Convertible debt schedules	The net carrying amount of the liability component of the Notes was as follows (in thousands): July 31, 2018 Principal $ 300,000 Unamortized debt discount (83,135 ) Unamortized debt issuance costs (6,312 ) Net carrying amount $ 210,553 The net carrying amount of the equity component of the Notes was as follows (in thousands): July 31, 2018 Debt discount for conversion option $ 84,168 Issuance costs (2,485 ) Net carrying amount $ 81,683
Interest expense related to Notes	The following table sets forth the interest expense related to the Notes (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Contractual interest expense $ 200 $ — $ 200 $ — Amortization of debt discount 1,034 — 1,034 — Amortization of issuance costs 60 — 60 — Total $ 1,294 $ — $ 1,294 $ —

Equity Incentive Plans and Em21

Equity Incentive Plans and Employee Stock Purchase Plan (Tables)	6 Months Ended
	Jul. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of stock option activity	The following table summarizes stock option activity for the six months ended July 31, 2018 (in thousands, except share and per share data and years): Shares Weighted- Weighted- Aggregate Balance - January 31, 2018 12,637,435 $ 7.63 7.72 $ 246,227 Stock options granted — — Stock options exercised (1,191,587 ) 6.78 Stock options forfeited and expired (519,506 ) 8.25 Balance - July 31, 2018 10,926,342 7.69 7.22 507,216 Vested and exercisable - January 31, 2018 5,540,858 6.33 6.63 115,122 Vested and exercisable - July 31, 2018 5,948,032 $ 6.62 6.42 $ 282,477
Schedule of restricted stock unit activity	The following table summarizes RSU activity for the six months ended July 31, 2018 : Shares Weighted-Average Grant Date Fair Value per RSU Unvested - January 31, 2018 245,746 $ 26.20 RSUs granted 1,351,332 41.38 RSUs vested (75,603 ) 50.34 RSUs forfeited and canceled (30,327 ) 34.96 Unvested - July 31, 2018 1,491,148 $ 38.56
Schedule of stock-based compensation expense recognized in consolidated statements of operations	Total stock-based compensation expense recognized in the Company’s interim unaudited condensed consolidated statements of operations is as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Cost of revenue—subscription $489 $170 $ 848 $ 321 Cost of revenue—services 281 98 465 170 Sales and marketing 2,129 1,482 4,347 2,697 Research and development 2,904 1,322 5,110 2,567 General and administrative 3,206 1,845 5,816 3,616 Total stock-based compensation expense $ 9,009 $ 4,917 $ 16,586 $ 9,371

Net Loss per Share (Tables)

Net Loss per Share (Tables)	6 Months Ended
	Jul. 31, 2018
Earnings Per Share [Abstract]
Schedule of basic and diluted earnings (loss) per share	The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders (in thousands, except share and per share data): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Numerator: Net loss $ (31,246 ) $ (26,079 ) $ (60,410 ) $ (45,769 ) Denominator: Weighted-average shares used to compute net loss per share, basic and diluted 51,185,258 13,600,435 50,784,422 13,386,109 Net loss per share, basic and diluted $ (0.61 ) $ (1.92 ) $ (1.19 ) $ (3.42 )
Schedule of antidilutive securities excluded from computation of earnings per share	The following weighted-average outstanding potentially dilutive common shares were excluded from the computation of diluted net loss per share for the periods presented because the impact of including them would have been antidilutive: Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Redeemable convertible preferred stock (as converted) — 26,920,022 — 26,910,099 Redeemable convertible preferred stock warrants (as converted) — 34,424 — 44,514 Common stock warrants — 122,043 — 122,043 Stock options to purchase Class A common stock 3,361,686 2,453,654 3,450,512 1,681,243 Stock options to purchase Class B common stock 8,271,986 9,689,809 8,636,638 10,015,105 Unvested restricted stock units 1,441,964 — 1,044,241 — Early exercised stock options 132,297 268,516 172,778 199,722

Segments and Geographic Reven23

Segments and Geographic Revenue (Tables)	6 Months Ended
	Jul. 31, 2018
Segment Reporting [Abstract]
Schedule of total revenue by geographic areas	The following table sets forth the Company’s total revenue by geographic area based on the customers’ location (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2018 2017 2018 2017 Americas $ 38,313 $ 24,518 $ 69,588 $ 46,920 Europe, Middle East and Africa 16,215 9,993 30,615 18,922 Asia Pacific 2,962 1,089 5,509 2,148 Total $ 57,490 $ 35,600 $ 105,712 $ 67,990

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Accounting Policies [Abstract]
Related party transactions	$ 0	$ 0	$ 0	$ 0
Amounts payable to or receivable from related parties	$ 0		$ 0		$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Financial Assets and Liabilities (Details) - Recurring - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Short-term investments:
Total financial assets	$ 492,079	$ 262,990
Level 1
Short-term investments:
Total financial assets	492,079	262,990
Level 2
Short-term investments:
Total financial assets	0	0
Level 3
Short-term investments:
Total financial assets	0	0
U.S. government treasury securities
Short-term investments:
Short-term investments:	399,906	217,072
U.S. government treasury securities | Level 1
Short-term investments:
Short-term investments:	399,906	217,072
U.S. government treasury securities | Level 2
Short-term investments:
Short-term investments:	0	0
U.S. government treasury securities | Level 3
Short-term investments:
Short-term investments:	0	0
Money Market Funds
Cash and cash equivalents:
Cash and cash equivalents:	92,173	45,918
Money Market Funds | Level 1
Cash and cash equivalents:
Cash and cash equivalents:	92,173	45,918
Money Market Funds | Level 2
Cash and cash equivalents:
Cash and cash equivalents:	0	0
Money Market Funds | Level 3
Cash and cash equivalents:
Cash and cash equivalents:	$ 0	$ 0

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details)	2 Months Ended	6 Months Ended
	Jul. 31, 2018USD ($)day$ / shares	Jul. 31, 2018USD ($)$ / shares	Jul. 31, 2017USD ($)	Jun. 30, 2018USD ($)
Debt Instrument [Line Items]
Proceeds from borrowings on convertible senior notes, net of issuance costs	$ 291,100,000	$ 293,161,000	$ 0
Convertible debt, conversion ratio	14.6738
Convertible debt, conversion ratio denominator	$ 1,000	$ 1,000
Initial conversion price (in dollars per share) | $ / shares	$ 68.15	$ 68.15
Consecutive threshold trading days | day	30
Threshold percentage of stock price trigger	130.00%
Carrying amount of convertible debt equity component	$ 84,200,000	$ 84,200,000
Fair value of convertible debt	$ 308,900,000	308,900,000
Minimum
Debt Instrument [Line Items]
Threshold trading days | day	20
Redemption Period 1
Debt Instrument [Line Items]
Consecutive threshold trading days | day	30
Threshold percentage of stock price trigger	130.00%
Redemption Period 1 | Minimum
Debt Instrument [Line Items]
Threshold trading days | day	20
Redemption Period 2
Debt Instrument [Line Items]
Convertible debt, conversion ratio denominator	$ 1,000	$ 1,000
Threshold trading days | day	5
Consecutive threshold trading days | day	5
Redemption Period 2 | Maximum
Debt Instrument [Line Items]
Trading price as a percentage of stock price and debt conversion rate	98.00%	98.00%
Convertible Debt
Debt Instrument [Line Items]
Face amount of debt	$ 50,000,000	$ 50,000,000		$ 250,000,000
Interest rate	0.75%	0.75%		0.75%
Convertible debt, conversion ratio denominator	$ 100	$ 100
Percentage of principal amount redeemed	100.00%
Debt issuance costs	$ 8,800,000	$ 8,800,000
Effective interest rate	7.03%	7.03%
Convertible Debt | Convertible Senior Notes, Liability Component
Debt Instrument [Line Items]
Debt issuance costs	$ 6,312,000	$ 6,312,000
Convertible Debt | Convertible Senior Notes, Equity Component
Debt Instrument [Line Items]
Carrying amount of convertible debt equity component	84,168,000	84,168,000
Debt issuance costs	$ 2,485,000	$ 2,485,000

Convertible Senior Notes - Sche

Convertible Senior Notes - Schedule of Net Carrying Amount of the Liability Component of the Notes (Details) - Convertible Debt $ in Thousands	Jul. 31, 2018USD ($)
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (8,800)
Convertible Senior Notes, Liability Component
Debt Instrument [Line Items]
Principal	300,000
Unamortized debt discount	(83,135)
Unamortized debt issuance costs	(6,312)
Net carrying amount	$ 210,553

Convertible Senior Notes - Sc28

Convertible Senior Notes - Schedule of Net Carrying Amount of the Equity Component of the Notes (Details) $ in Thousands	Jul. 31, 2018USD ($)
Debt Instrument [Line Items]
Debt discount for conversion option	$ 84,200
Convertible Debt
Debt Instrument [Line Items]
Unamortized debt issuance costs	(8,800)
Convertible Senior Notes, Equity Component | Convertible Debt
Debt Instrument [Line Items]
Debt discount for conversion option	84,168
Unamortized debt issuance costs	(2,485)
Net carrying amount	$ 81,683

Convertible Senior Notes - Sc29

Convertible Senior Notes - Schedule of Interest Expense for the Notes (Details) - Convertible Debt - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Debt Instrument [Line Items]
Contractual interest expense	$ 200	$ 0	$ 200	$ 0
Amortization of debt discount	1,034	0	1,034	0
Amortization of issuance costs	60	0	60	0
Total	$ 1,294	$ 0	$ 1,294	$ 0

Convertible Senior Notes - Capp

Convertible Senior Notes - Capped Calls (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	2 Months Ended	6 Months Ended
	Jul. 31, 2018	Jul. 31, 2018
Option Indexed to Issuer's Equity [Line Items]
Purchase of capped calls	$ 37,100	$ 37,086
Capped Calls
Option Indexed to Issuer's Equity [Line Items]
Strike price (in dollars per share)	$ 68.15
Cap price (in dollars per share)	$ 106.90
Capped Calls | Class A Common Stock
Option Indexed to Issuer's Equity [Line Items]
Underlying capped calls (in shares)	4.4

Commitments and Contingencies (

Commitments and Contingencies (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Operating leases, rent expense	$ 3,100,000	$ 2,100,000	$ 6,200,000	$ 4,200,000
Accrual for contingencies	$ 0		$ 0		$ 0

Equity Incentive Plans and Em32

Equity Incentive Plans and Employee Stock Purchase Plan - Stock Options (Details) - Employee Stock Option	6 Months Ended
	Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
One Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage	25.00%
13 to 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage	75.00%

Equity Incentive Plans and Em33

Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2018	Jan. 31, 2018
Shares
Balance - beginning of period (in shares)	12,637,435
Stock options granted (in shares)	0
Stock options exercised (in shares)	(1,191,587)
Stock options forfeited and expired (in shares)	(519,506)
Balance - end of period (in shares)	10,926,342	12,637,435
Vested and exercisable (in shares)	5,948,032	5,540,858
Weighted- Average Exercise Price Per Share
Balance - beginning of period (in dollars per share)	$ 7.63
Stock options granted (in dollars per share)	0
Stock options exercised (in dollars per share)	6.78
Stock options forfeited and expired (in dollars per share)	8.25
Balance - end of period (in dollars per share)	7.69	$ 7.63
Vested and exercisable (in dollars per share)	$ 6.62	$ 6.33
Weighted- Average Remaining Contractual Term (In Years)
Balance	7 years 2 months 19 days	7 years 8 months 19 days
Vested and exercisable	6 years 5 months 1 day	6 years 7 months 17 days
Aggregate Intrinsic Value
Balance	$ 507,216	$ 246,227
Vested and exercisable	$ 282,477	$ 115,122

Equity Incentive Plans and Em34

Equity Incentive Plans and Employee Stock Purchase Plan - Restricted Stock Units, Additional Information (Details) - Restricted Stock Units (RSUs)	6 Months Ended
	Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
One Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Vesting rights percentage	25.00%
13 to 36 Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage	75.00%

Equity Incentive Plans and Em35

Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - $ / shares	6 Months Ended
	Jul. 31, 2018	Jan. 31, 2018
Shares
Unvested - beginning of period (in dollars per share)	245,746
RSUs granted (in shares)	1,351,332
RSUs vested (in shares)	(75,603)
RSUs forfeited and canceled (in shares)	(30,327)
Unvested - end of period (in dollars per share)	1,491,148
Weighted-Average Grant Date Fair Value per RSU
Unvested (in dollars per share)	$ 38.56	$ 26.20
RSUs granted (in dollars per share)	41.38
RSUs vested (in dollars per share)	50.34
RSUs forfeited and canceled (in dollars per share)	$ 34.96

Equity Incentive Plans and Em36

Equity Incentive Plans and Employee Stock Purchase Plan - Employee Stock Purchase Plan (Details) - shares	1 Months Ended	3 Months Ended	6 Months Ended
	Oct. 31, 2017	Jul. 31, 2018	Jul. 31, 2018
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under the Employee Stock Purchase Plan (in shares)		275,874
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee contribution rate	15.00%
Duration of separate offering periods	6 months
Purchase price of common stock, as a percent			85.00%
Employee Stock Purchase Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares)	1,500,000

Equity Incentive Plans and Em37

Equity Incentive Plans and Employee Stock Purchase Plan - Stock-based Compensation Expense Recognized in Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 9,009	$ 4,917	$ 16,586	$ 9,371
Cost of revenue—subscription
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	489	170	848	321
Cost of revenue—services
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	281	98	465	170
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2,129	1,482	4,347	2,697
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2,904	1,322	5,110	2,567
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 3,206	$ 1,845	$ 5,816	$ 3,616

Net Loss per Share - Additional

Net Loss per Share - Additional Information (Details)	6 Months Ended
	Jul. 31, 2018vote$ / shares
Class of Stock [Line Items]
Initial conversion price (in dollars per share) | $ / shares	$ 68.15
Class A Common Stock
Class of Stock [Line Items]
Number of votes per share	1
Class B Common Stock
Class of Stock [Line Items]
Number of votes per share	10

Net Loss per Share - Schedule o

Net Loss per Share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Earnings Per Share [Abstract]
Net loss	$ (31,246)	$ (26,079)	$ (60,410)	$ (45,769)
Weighted-average shares used to compute net loss per share, basic and diluted (in shares)	51,185,258	13,600,435	50,784,422	13,386,109
Net loss per share, basic and diluted (in dollars per share)	$ (0.61)	$ (1.92)	$ (1.19)	$ (3.42)

Net Loss per Share - Schedule40

Net Loss per Share - Schedule of Antidilutive Securities Excluded from the Computation of Diluted Net Loss per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Redeemable convertible preferred stock (as converted)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	26,920,022	0	26,910,099
Redeemable convertible preferred stock warrants (as converted)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	34,424	0	44,514
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	122,043	0	122,043
Stock options to purchase common stock | Class A Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	3,361,686	2,453,654	3,450,512	1,681,243
Stock options to purchase common stock | Class B Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	8,271,986	9,689,809	8,636,638	10,015,105
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,441,964	0	1,044,241	0
Early exercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	132,297	268,516	172,778	199,722

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 246,000	$ 252,000	$ 713,000	$ 481,000
Unrecognized tax benefits	4,300,000		4,300,000
Unrecognized tax benefits that would impact effective tax rate	0		0
Decrease in unrecognized tax benefits is reasonably possible	$ 0		$ 0

Segments and Geographic Reven42

Segments and Geographic Revenue - Additional Information (Details) - segment	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Segment Reporting [Abstract]
Number of operating segments			1
Geographic Concentration Risk | Revenue, Net | United States
Concentration Risk [Line Items]
Concentration risk, percentage	63.00%	65.00%	62.00%	65.00%
Geographic Concentration Risk | Revenue, Net | United Kingdom
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%	10.00%	10.00%	10.00%

Segments and Geographic Reven43

Segments and Geographic Revenue - Schedule of total revenue by geographic areas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	$ 57,490	$ 35,600	$ 105,712	$ 67,990
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	38,313	24,518	69,588	46,920
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	16,215	9,993	30,615	18,922
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total	$ 2,962	$ 1,089	$ 5,509	$ 2,148

Subsequent Events (Details)

Subsequent Events (Details)	1 Months Ended
	Dec. 31, 2017ft²
Subsequent Events [Abstract]
Rentable office space (in sq ft)	106,230

Uncategorized Items - mdb-20180

Label	Element	Value
Restricted Cash, Current	us-gaap_RestrictedCashCurrent	$ 518,000
Restricted Cash, Current	us-gaap_RestrictedCashCurrent	$ 518,000