Coupa Software (COUP) 10-Q 6 Jun 18 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Apr. 30, 2018	Jun. 04, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q1
Trading Symbol	COUP
Entity Registrant Name	Coupa Software Incorporated
Entity Central Index Key	1,385,867
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		56,999,455

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 430,030	$ 412,903
Accounts receivable, net of allowances	47,052	61,366
Prepaid expenses and other current assets	11,497	10,952
Deferred commissions, current portion	4,883	3,756
Total current assets	493,462	488,977
Property and equipment, net	5,411	5,186
Deferred commissions, net of current portion	12,541	3,896
Goodwill	44,410	44,410
Intangible assets, net	18,946	20,020
Other assets	5,326	9,961
Total assets	580,096	572,450
Current liabilities:
Accounts payable	1,875	1,342
Accrued expenses and other current liabilities	28,573	26,643
Deferred revenue, current portion	120,458	125,714
Total current liabilities	150,906	153,699
Convertible senior notes, net (Note 8)	165,758	163,010
Deferred revenue, net of current portion	1,428	2,316
Other liabilities	12,874	12,880
Total liabilities	330,966	331,905
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock, $0.0001 par value per share; 25,000,000 shares authorized at April 30, 2018 and January 31, 2018; zero shares issued and outstanding at April 30, 2018 and January 31, 2018, respectively
Common stock, $0.0001 par value per share; 625,000,000 shares authorized at April 30, 2018 and January 31, 2018; 56,857,119 and 55,712,342 shares issued and outstanding at April 30, 2018 and January 31, 2018, respectively	6	6
Additional paid-in capital	463,911	445,318
Accumulated other comprehensive loss	(258)	(298)
Accumulated deficit	(214,529)	(204,481)
Total stockholders’ equity	249,130	240,545
Total liabilities and stockholders’ equity	$ 580,096	$ 572,450

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Apr. 30, 2018	Jan. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	625,000,000	625,000,000
Common stock, shares issued	56,857,119	55,712,342
Common stock, shares outstanding	56,857,119	55,712,342

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Revenues:
Revenues	$ 56,352,000	$ 41,137,000
Cost of revenues:
Cost of revenues	18,125,000	13,497,000
Gross profit	38,227,000	27,640,000
Operating expenses:
Research and development	13,201,000	9,171,000
Sales and marketing	24,660,000	20,679,000
General and administrative	12,435,000	8,177,000
Total operating expenses	50,296,000	38,027,000
Loss from operations	(12,069,000)	(10,387,000)
Interest expense	(2,973,000)
Interest income and other, net	78,000	433,000
Loss before provision for income taxes	(14,964,000)	(9,954,000)
Provision for income taxes	490,000	84,000
Net loss	$ (15,454,000)	$ (10,038,000)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.28)	$ (0.20)
Weighted-average number of shares used in computing net loss per share attributable to common stockholders, basic and diluted	55,873	50,577
Subscription services
Revenues:
Revenues	$ 49,966,000	$ 35,664,000
Cost of revenues:
Cost of revenues	11,174,000	7,996,000
Professional Services and Other
Revenues:
Revenues	6,386,000	5,473,000
Cost of revenues:
Cost of revenues	$ 6,951,000	$ 5,501,000

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Income Statement [Abstract]
Net loss	$ (15,454)	$ (10,038)
Other comprehensive gain in relation to defined benefit plans, net of tax	40
Comprehensive loss	$ (15,414)	$ (10,038)

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Cash flows from operating activities
Net loss	$ (15,454)	$ (10,038)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	2,015	1,536
Amortization of deferred commissions	1,192	1,040
Amortization of debt discount and issuance costs	2,748
Stock-based compensation	11,312	5,277
Other non-cash items		105
Changes in operating assets and liabilities:
Accounts receivable	14,314	12,570
Prepaid expenses and other current assets	(1,679)	(336)
Other assets	161	(660)
Deferred commissions	(1,927)	(887)
Accounts payable	534	31
Accrued expenses and other liabilities	3,822	529
Deferred revenue	(4,402)	(2,224)
Net cash provided by operating activities	12,636	6,943
Cash flows from investing activities
Acquisitions, net of cash acquired	(1,178)	(140)
Purchases of property and equipment	(1,124)	(996)
Net cash used in investing activities	(2,302)	(1,136)
Cash flows from financing activities
Payment of issuance costs for the issuance of senior convertible notes	(639)
Proceeds from issuance of common stock, net of underwriting discounts, commissions and offering costs		23,040
Proceeds from the exercise of common stock options	3,295	4,527
Proceeds from issuance of common stock for employee stock purchase plan	4,137	3,026
Net cash provided by financing activities	6,793	30,593
Net increase in cash, cash equivalents, and restricted cash	17,127	36,400
Cash, cash equivalents, and restricted cash at beginning of year	412,976	201,972
Cash, cash equivalents, and restricted cash at end of period	430,103	238,372
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	430,030	238,121
Restricted cash included in prepaid expenses and other current assets		251
Restricted cash included in other assets	73
Cash, cash equivalents, and restricted cash at end of period	430,103	238,372
Supplemental disclosure of cash flow data
Cash paid for income taxes	287	97
Supplemental disclosure of non-cash investing and financing activities
Vesting of early exercised stock options	91	172
Property and equipment included in accounts payable and accrued expenses and other current liabilities	$ 95	89
Offering costs included in accounts payable and accrued expenses and other current liabilities		$ 777

Organization and Description of

Organization and Description of Business	3 Months Ended
	Apr. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Description of Business	Note 1. Organization and Description of Business Coupa Software Incorporated (the “Company”) was incorporated in the state of Delaware in 2006. The Company provides a comprehensive, cloud-based business spend management (or BSM) platform that provides greater visibility into and control over how companies spend money. The BSM platform enables businesses to achieve savings that drive profitability. The Company is based in San Mateo, California .

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Apr. 30, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	Note 2. Significant Accounting Policies Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared using accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended January 31, 2018 filed with the SEC on March 28, 2018 (the “Form 10-K”). The consolidated financial statements include the results of the Company and its wholly owned subsidiaries. All significant intercompany transactions and balances have been eliminated during consolidation. The 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 GAAP on an annual reporting basis. Certain amounts in the condensed consolidated financial statements and notes to the condensed consolidated financial statements for the prior period have been reclassified to conform to the presentation for the three months ended April 30, 2018. Net operating results have not been affected by these reclassifications. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results to be expected for the full fiscal year or any other period. There have been no changes to our significant accounting policies described in the Form 10-K for the year ended January 31, 2018 except for changes applied due to the adoption of ASU No. 2014-09, Revenue from Contracts with Customers. Refer to “Recently Adopted Accounting Pronouncements.” Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, management evaluates its significant estimates including, but not limited to, the valuation of accounts receivable, the lives of tangible and intangible assets, stock-based compensation, the valuation of acquired intangible assets and the recoverability or impairment of tangible and intangible assets, including goodwill, stock-based compensation, revenue recognition, the valuation of acquired assets and liabilities assumed, convertible senior notes fair value, the benefit period of deferred commissions, and provisions for income taxes. Management bases its estimates on historical experience and on various other market-specific and relevant assumptions that management believes to be reasonable under the circumstances. Actual results could differ from those estimates and such differences could be material to the financial position and results of operations. Concentration of Risk Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash and cash equivalents and accounts receivable. Cash deposits may, at times, exceed amounts insured by the Federal Deposit Insurance Corporation and the Securities Investor Protection Corporation. The Company has not experienced any losses on its deposits of cash and cash equivalents to date. Comprehensive Loss Comprehensive loss is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company’s comprehensive loss consists of net loss and other comprehensive loss. Other comprehensive loss represents net deferred gains and losses and prior service costs and credits for defined benefit pension plans. Revenue Recognition The Company derives its revenues primarily from subscription services fees and professional services fees. Revenues are recognized when control of these services are transferred to the Company’s customers in an amount that reflects the consideration expected to be entitled to in exchange for those services. Revenues are recognized net of applicable taxes imposed on the related transaction. The Company’s revenue recognition policy follows guidance from Accounting Standards Codification 606, Revenue from Contracts with Customers (Topic 606) . The Company determines revenue recognition through the following five-step framework: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, the Company satisfies a performance obligation. Subscription Services Revenues The Company offers subscriptions to its cloud-based business spend management platform, including procurement, invoicing and expense management. Subscription services revenues consist primarily of fees to provide the Company’s customers access to its cloud-based platform, which includes routine customer support. Subscription service contracts do not provide customers with the right to take possession of the software, are non-cancelable, and do not contain general rights of return. Revenues are recognized ratably over the contractual term of the arrangement, beginning on the date that the service is made available to the customer. Subscription contracts typically have a term of three years with invoicing occurring in annual installments at the beginning of each year in the subscription period. Professional Services Revenues The Company offers professional services which include deployment services, optimization services, and training. Professional services are generally sold on a fixed-fee or time-and-materials basis. For services billed on a fixed-fee basis, invoicing typically occurs in advance, and revenue is recognized over time based on the proportion performed. For services billed on a time-and-materials basis, revenue is recognized over time as services are performed. Refer to Note 13, “Significant Customers and Geographic Information” for additional information on disaggregated revenue during the period. Significant Judgments The Company’s contracts with customers often include promises to transfer multiple products and services to a customer. For these contracts, the Company accounts for individual performance obligations separately if they are distinct. Subscription services and professional services are both distinct performance obligations that are accounted for separately. In contracts with multiple performance obligations, the transaction price is allocated to separate performance obligations on a relative standalone selling price basis. The determination of standalone selling price (“SSP”) for each distinct performance obligations requires judgment. The Company determines SSP for performance obligatons based on overall pricing objectives, which take into consideration market conditions and entity-specific factors. This includes a review of historical data related to the size of arrangements, the cloud applications being sold, customer demographics and the numbers and types of users within the arrangements. The Company uses a range of amounts to estimate SSP for performance obligations. There is typically more than one SSP for individual products and services due to the stratification of those products and services by information such as size and type of customer. Contract Balances The timing of revenue recognition may differ from the timing of invoicing for contracts with customers. The Company records a receivable when revenue is recognized prior to invoicing, or deferred revenue when revenue is recognized subsequent to invoicing. Subscription services and certain professional services arrangements are commonly billed in advance which results in a deferred revenue balance amortized as revenue is recognized over time. However, other professional services arrangements, primarily those recognized on a time-and-materials basis, are billed in arrears following services that have been rendered. This may result in revenue recognition greater than invoiced amounts which results in a receivable balance. Receivables represent an unconditional right to payment. As of April 30, 2018 and January 31, 2018, the balance of accounts receivable, net of the allowance for doubtful accounts, was $47.1 million and $61.4 million, respectively. Of these balances, $1.0 million and $1.2 million represent unbilled receivable amounts as of April 30, 2018 and January 31, 2018, respectively. When the timing of revenue recognition differs from the timing of invoicing, the Company uses judgment to determine whether the contract includes a significant financing component requiring adjustment to the transaction price. Various factors are considered in this determination including the duration of the contract, payment terms, and other circumstances. Generally, the Company determined that contracts do not include a significant financing component. At any point in the contract term, transaction price may be allocated to performance obligations that are unsatisfied or are partially unsatisfied. These amounts relate to remaining performance obligations on non-cancelable contracts which include both the deferred revenue balance and amounts that will be invoiced and recognized as revenue in future periods. As of April 30, 2018, approximately $340.8 million of revenue is expected to be recognized from remaining performance obligations, a majority of which is related to multi-year subscription arrangements. The Company expects to recognize revenue on approximately three fourths of these remaining performance obligations within the next 24 months and the remainder thereafter. The Company applies the practical expedient to exclude remaining performance obligations that are part of contracts with an original expected duration of one year or less. During the three months ended April 30, 2018, the revenue recognized from performance obligations satisfied in prior periods was not material. Accounts Receivable and Allowance for Doubtful Accounts The Company extends credit to its customers in the normal course of business, and does not require cash collateral or other security to support the collection of customer receivables. The Company estimates the amount of uncollectible accounts receivable at the end of each reporting period based on the aging of the receivable balance, historical experience, and communications with customers, and provides a reserve when needed. Accounts receivable are written off when deemed uncollectible. The allowance for doubtful accounts was not material at April 30, 2018 and January 31, 2018. Deferred Revenue Deferred revenue consists of customer billings or payments received in advance of the recognition of revenue and is recognized as revenue as the revenue recognition criteria are met. The Company generally invoices its customers annually for the forthcoming year of service. Accordingly, the Company’s deferred revenue balance does not include revenue for future years of multiple year non-cancellable contracts that have not yet been billed. During the three months ended April 30, 2018, the Company recognized revenue of $47.8 million that was included in the deferred revenue balance as of January 31, 2018. Deferred Commissions Commissions are earned by sales personnel upon the execution of the sales contract by the customer, and commission payments are made shortly after they are earned. Commission costs can be associated specifically with subscription and professional services arrangements. Commissions earned by the Company’s sales personnel are considered incremental and recoverable costs of obtaining a contract with a customer. These costs are deferred and then amortized over a period of benefit of five years. The Company determined the period of benefit by taking into consideration its past experience with customers, present value of future cash flows, industry peers and other available information. The current portion of deferred commissions was $4.9 million and $3.8 million at April 30, 2018 and January 31, 2018, respectively. The noncurrent portion of deferred commissions was $12.5 million and $3.9 million at April 30, 2018 and January 31, 2018, respectively. For the three months ended April 30, 2018, $1.2 million of deferred commissions were amortized to sales and marketing expense in the accompanying condensed consolidated statements of operations. Recently Adopted Accounting Pronouncements Revenue from Contracts with Customers In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) which provided a comprehensive model for entities to use in accounting for revenue arising from contracts with customers. Revenue Recognition Topic 606 also includes Subtopic 340-40 which provides accounting guidance for incremental costs of obtaining a contract with a customer. The Company refers to Topic 606 and Subtopic 340-40 collectively as the “new revenue standard.” The Company adopted the new revenue standard effective on February 1, 2018 using the modified retrospective method applied to all contracts not completed as of the adoption date. Results for reporting periods beginning on February 1, 2018 are presented under the new revenue standard, while comparative results have not been restated. The primary impact of adopting the new revenue standard relates to Subtopic 340-40 and the deferral of incremental commission costs to obtain contracts with customers. Under Topic 605, the Company deferred only direct and incremental commission costs to obtain a contract and amortized those costs over the non-cancelable contract term. Under the new revenue standard, the Company defers all incremental commission costs to obtain the contract. The Company amortizes these costs over a period of benefit of five years. The adoption of the new revenue standard also removed the limitation on contingent revenue under Topic 605 which impacted revenue recognition and is reflected in the changes to the Company’s revenue recognition accounting policy. The following table summarizes the cumulative impact of adoption of the new revenue standard for revenue recognition on line items within the Condensed Consolidated Balance Sheets (in thousands): As of January 31, 2018 As Previously Reported Adjustments for the New Revenue Standard As Adjusted Assets Deferred commissions, current portion $ 3,756 $ 778 $ 4,534 Deferred commissions, net of current portion 3,896 8,257 12,153 Liabilities and Stockholders’ Equity Deferred revenue, current portion 125,714 (1,732 ) 123,982 Deferred revenue, net of current portion 2,316 (10) 2,306 Accumulated deficit (204,481 ) 10,777 (215,258) The impact of adoption on the condensed consolidated statements of operations and condensed consolidated statements of cash flows for the three months ended April 30, 2018 was immaterial. The impact to sales and marketing expense within the condensed consolidated statements of operations was a decrease of approximately $808,000 due to deferred commission costs that would have been expensed prior to adoption of the new standard. The following table summarizes the effects of the new revenue standard for revenue recognition on line items within the Condensed Consolidated Balance Sheets (in thousands): As of April 30, 2018 Prior to Adoption of the New Revenue Standard Adjustments for the New Revenue Standard As Adjusted Assets Deferred commissions, current portion $ 3,797 $ 1,086 $ 4,883 Deferred commissions, net of current portion 3,784 8,757 12,541 Liabilities and Stockholders’ Equity Deferred revenue, current portion 122,139 (1,681 ) 120,458 Deferred revenue, net of current portion 1,435 (7 ) 1,428 Accumulated deficit (202,998 ) 11,531 (214,529) In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash In March 2017, the FASB issued ASU No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (Topic 715) In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting New Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, Leases In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260)-Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part I) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception (“ASU 2017-11”). The amendments in Part I ASU 2017-11 change the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. When determining whether certain financial instruments should be classified as liabilities or equity instruments a down round feature no longer precludes equity classification when assessing whether the instrument is indexed to an entity’s own stock. The amendments in Part II of ASU 2017-11recharacterize the indefinite deferral of certain provisions of Topic 480 with a scope exception and do not have an accounting effect. This accounting standard update is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods. The Company is currently evaluating the impact of adopting ASU 2017-11 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 The Company is currently evaluating the impact of adopting ASU 2018-02 on its consolidated financial statements.

Business Combinations

Business Combinations	3 Months Ended
	Apr. 30, 2018
Business Combinations [Abstract]
Business Combinations	Note 3. Business Combinations Simeno Holdings AG On December 1, 2017, the Company acquired all of the issued and outstanding capital stock held by of Simeno Holdings AG (“Simeno”), a Switzerland based cross-catalog search and catalog management company. The acquisition was accounted for as a business combination and, accordingly, the total fair value of purchase consideration was allocated to the tangible and intangible assets acquired and liabilities assumed based on their fair values on the acquisition date. The total purchase consideration was $8.7 million in cash, of which $1.5 million is being held until the second anniversary after closing of the acquisition. In addition, approximately $8.0 million in the form of 221,257 shares of the Company’s common stock was issued to the selling shareholder of Simeno and this stock is subject to service vesting conditions including continued employment with the Company. The value assigned to the common stock issued will be recorded as post-acquisition compensation expense over the requisite service period and has been excluded from the purchase consideration. The major classes of assets and liabilities to which the Company has allocated the fair value of purchase consideration were as follows: (in thousands): December 1, 2017 Cash and cash equivalents $ 747 Accounts receivable 1,912 Intangible assets 3,820 Other assets 331 Deferred tax assets, net 285 Goodwill 7,264 Accounts payable and other liabilities (1,405 ) Pension plan obligation (4,226 ) Total consideration $ 8,728 The Company continues to collect information and reevaluate the estimates and assumptions and records any adjustments to the Company’s preliminary estimates to goodwill provided that the Company is within the measurement period. The goodwill recognized was primarily attributed to increased synergies that are expected to be achieved from the integration of Simeno and is not expected to be deductible for income tax purposes. The Company determined the fair values of intangible assets acquired and liabilities assumed with the assistance of third party valuation consultants. Based on this valuation, the intangible assets acquired are (in thousands): Fair Value Useful life (in Years) Developed technology $ 2,300 4 Customer relationships 1,520 4 Total intangible assets $ 3,820 Simeno maintained a pension plan covering employees in Switzerland pursuant to the requirements of Swiss pension law, which has been assumed by the Company upon the completion of the acquisition. The pension plan is accounted for as a defined benefit pension plan, which requires the Company to recognize the underfunded status of the plan as a liability in the consolidated balance sheets and changes in the funded status of defined benefit pension plan through other comprehensive income (loss). As of the acquisition date in December 2017, the Company recorded net liabilities of $4.2 million on its consolidated balance sheet in connection with this pension plan. The changes in the funded status of the defined benefit plan for the quarter ended April 30, 2018 was not material. The Company incurred costs related to this acquisition of approximately $445,000 during the year ended January 31, 2018 and no significant costs were incurred during the three month ended April 30, 2018. All acquisition related costs were expensed as incurred and have been recorded in general and administrative expenses in the accompanying consolidated statements of operations. Trade Extensions TradeExt AB On May 3, 2017, the Company acquired substantially all of the issued and outstanding capital stock held by shareholders of Trade Extensions TradeExt AB (“Trade Extensions”), a Swedish corporation. The acquisition enabled the Company to broaden its cloud platform for business spend, particularly in the area of strategic sourcing. Upon the closing of the acquisition, the Company paid aggregate consideration of approximately $40.9 million in cash, of which $7.2 million is being held in escrow for 18 months after the transaction closing date. In addition, approximately $4.1 million in the form of 148,476 shares of the Company’s common stock was issued to certain key employees of Trade Extensions, which stock is subject to service vesting conditions including continued employment with the Company. The value assigned to the common stock issued will be recorded as post-acquisition compensation expense and has been excluded from the purchase consideration. The major classes of assets and liabilities to which the Company has allocated the fair value of purchase consideration were as follows: (in thousands): May 3, 2017 Cash and cash equivalents $ 2,016 Accounts receivable 1,172 Intangible assets 12,960 Other assets 2,086 Goodwill 30,840 Accounts payable and other liabilities (8,125 ) Total consideration $ 40,949 Other assets include indemnification assets totaling $1.4 million due to assumed liability for which the seller is responsible. The goodwill recognized was primarily attributed to increased synergies that are expected to be achieved from the integration of Trade Extensions and is not expected to be deductible for income tax purposes. The Company determined the fair values of intangible assets acquired with the assistance of third party valuation consultants. Based on this valuation, the intangible assets acquired are (in thousands): Fair Value Useful life (in Years) Developed technology $ 9,700 7 Customer relationships 3,100 5 Trademarks 160 1 Total intangible assets $ 12,960 The Company incurred costs related to this acquisition of approximately $526,000 during the year ended January 31, 2018. All acquisition related costs were expensed as incurred and have been recorded in general and administrative expenses in the accompanying consolidated statements of operations.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Apr. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 4 . Fair Value Measurements Fair value is the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Subsequent changes in fair value of these financial assets and liabilities are recognized in earnings or other comprehensive income when they occur. When determining the fair value measurements for assets and liabilities which are required to be recorded at fair The Company applies the following fair value hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: • Level 1 - Quoted prices in active markets for identical assets or liabilities. • Level 2 - Observable inputs other than quoted price in active markets for identical assets or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially full term of assets or liabilities. • Level 3 - Inputs that are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the assets or liabilities. The following table summarizes the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis (in thousands): Level 1 Level 2 Level 3 Total April 30, 2018 Money market funds (1) $ 406,132 $ — $ — $ 406,132 January 31, 2018 Money market funds (1) 389,357 — — 389,357 (1) Included in cash and cash equivalents. The Company carries the convertible senior notes at face value less unamortized discount and issuance costs on its consolidated balance sheet, and presents the fair value for required disclosure purposes only. As of April 30, 2018, the fair value of the Convertible Notes was $280.6 million, which was determined on the basis of market prices observable for similar instruments and is considered Level 2 in the fair value hierarchy. As of January 31, 2018, the fair value of the Convertible Notes approximated its carrying amount at that time. For further information on the Convertible Notes see Note 8.

Property and Equipment, Net

Property and Equipment, Net	3 Months Ended
	Apr. 30, 2018
Property Plant And Equipment [Abstract]
Property and Equipment, Net	Note 5 . Property and Equipment, net Property and equipment consisted of the following (in thousands): April 30, January 31, 2018 2018 Furniture and equipment $ 2,162 $ 1,897 Software development costs 17,529 16,574 Leasehold improvements 709 557 Construction in progress 25 149 Total property and equipment 20,425 19,177 Less: accumulated depreciation and amortization (15,014 ) (13,991 ) Property and equipment, net $ 5,411 $ 5,186 Depreciation and amortization expense related to property and equipment, excluding software development costs, was approximately $196,000 and $115,000 for the three months ended April 30, 2018 and 2017, respectively. Amortization expense related to software development costs was approximately $826,000 and $989,000 for the three months ended April 30, 2018 and 2017, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Apr. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 6 . Goodwill and Other Intangible Assets Goodwill Goodwill was $44.4 million as of April 30, 2018 and January 31, 2018. Other Intangible Assets The following table summarizes the other intangible asset balances (in thousands): As of April 30, 2018 January 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 20,035 $ (4,937 ) 15,098 $ 19,385 $ (4,153 ) 15,232 Customer relationships 4,694 (847 ) 3,847 4,694 (597 ) 4,097 Trademarks 160 (159 ) 1 160 (119 ) 41 In-process research and development — — — 650 — 650 Total other intangible assets $ 24,889 $ (5,943 ) $ 18,946 $ 24,889 $ (4,869 ) $ 20,020 Amortization expense related to other intangible assets was approximately $1.1 million and $485,000 for the three months ended April 30, 2018 and 2017, respectively. As of April 30, 2018, the future amortization expense of other intangible assets is as follows (in thousands): Year Ending January 31, 2019 (remaining nine months) $ 3,271 2020 4,283 2021 4,264 2022 3,839 2023 1,546 Thereafter 1,743 Total $ 18,946

Common Stock and Stockholders'

Common Stock and Stockholders' Equity	3 Months Ended
	Apr. 30, 2018
Equity [Abstract]
Common Stock and Stockholders' Equity	Note 7 . Common Stock and Stockholders’ Equity Common Stock Each share of common stock has the right to one vote. Preferred Stock As of April 30, 2018 2016 Equity Incentive Plan The 2016 Equity Incentive Plan (the “2016 Plan”) was approved by the Company’s stockholders in September 2016. The 2016 Plan provides for the grant of incentive stock options, nonstatutory stock options, restricted stock, restricted stock units, stock appreciation rights and performance cash awards. Awards could be granted under the 2016 Plan beginning on the effective date of the registration statement, October 5, 2016. The 2016 Plan replaced the Company’s 2006 Stock Plan; however, awards outstanding under the 2006 Stock Plan will continue to be governed by their existing terms. As of April 30, 2018, the Company had 6,213,870 shares of its common stock available for future issuance under the 2016 Plan. The number of shares reserved for issuance under the 2016 Plan will automatically increase on the first day of each fiscal year during the term of the 2016 Plan by a number of shares equal to 5% of its outstanding shares of common stock on the last day of the prior fiscal year. The number and class of shares reserved under the Company’s 2016 Plan will be adjusted in the event of a stock split, stock dividend or other changes in its capitalization. The following table summarizes stock option activity under the Company’s 2006 Stock Plan and the 2016 Plan during the three months ended April 30, 2018 (aggregate intrinsic value in thousands): Options Outstanding Outstanding Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual (in Years) Aggregate Intrinsic Value Balance at January 31, 2018 9,301,253 $ 7.19 7.30 $ 288,713 Option grants 553,697 $ 48.47 — — Options exercised (781,109 ) $ 4.22 — — Options forfeited (80,841 ) $ 9.19 — — Balance at April 30, 2018 8,993,000 $ 9.97 7.30 $ 328,495 Vested and expected to vest at April 30, 2018 8,993,000 $ 9.97 7.30 $ 328,495 Exercisable at April 30, 2018 5,432,755 $ 5.75 6.72 $ 220,679 The options exercisable as of April 30, 2018 include options that are exercisable prior to vesting. The aggregate intrinsic value of options vested and exercisable as of April 30, 2018 is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of April 30, 2018. The aggregate intrinsic value of exercised options was $32.1 million and $27.7 million for the three months ended April 30, 2018 and 2017, respectively, and is calculated based on the difference between the exercise price and the fair value of the Company’s common stock as of the exercise date. The weighted-average grant date fair value of options granted was $21.56 and $11.04 per share for the three months ended April 30, 2018 and 2017, respectively. Early Exercises of Stock Options Certain option grants under the 2006 Stock Plan are allowed to be exercised prior to vesting. The unvested shares of common stock exercised are subject to the Company’s right to repurchase at the lower of the original exercise price or the fair market value of the share at the time the repurchase right is exercised. Early exercises of options are not deemed to be substantive exercises for accounting purposes and accordingly, amounts received for early exercises are initially recorded in accrued expenses and other current liabilities and reclassified to additional paid-in capital as the underlying shares vest. At April 30, 2018, the Company had $243,000 recorded in accrued expenses and other current liabilities related to early exercises of stock options, and the related number of unvested shares subject to repurchase was 38,189. Restricted Stock Units (“RSUs”) The following table summarizes the activity related to the Company’s RSUs: Number of RSUs Outstanding Weighted-Average Grant Date Fair Value Awarded and unvested at January 31, 2018 1,971,778 $ 27.14 Awards granted 1,420,032 $ 48.03 Awards vested (115,833 ) $ 24.46 Awards forfeited (97,404 ) $ 30.52 Awarded and unvested at April 30, 2018 3,178,573 $ 36.47 2016 Employee Stock Purchase Plan The Board of Directors adopted the 2016 Employee Stock Purchase Plan (the “ESPP”) in September 2016 and it has been approved by the Company’s stockholders. The ESPP allows eligible employees to purchase shares of common stock through payroll deductions and is intended to qualify under Section 423 of the Internal Revenue Code. As of April 30, 2018, the Company had 1,188,527 shares of its common stock available for future issuance under the ESPP. The number of shares reserved for issuance under the ESPP will automatically increase on the first day of each fiscal year during the term of the ESPP by a number of shares equal to the least of (i) 1% of its outstanding shares of common stock on the last day of the prior fiscal year, (ii) 1,250,000 shares or (iii) a lesser number of shares determined by the Board of Directors. The number and class of shares reserved under the ESPP will be adjusted in the event of a stock split, stock dividend or other changes in its capitalization. Each offering period will last a number of months determined by the administrator, up to a maximum of 27 months. The initial offering period began on the effective date of the Company’s initial public offering, October 5, 2016, and ends on September 15, 2018, and new 24 month offering periods will begin on each March 16 and September 16 thereafter. Currently each offering period consists of four consecutive purchase periods, of approximately six months duration, at the end of which payroll contributions are used to purchase shares of the Company’s common stock. Participants may purchase the Company’s common stock through payroll deductions, up to a maximum of 15% of their eligible compensation. Participants may withdraw from the ESPP and receive a refund of their accumulated payroll contributions at any time prior to a purchase date. Unless changed by the administrator, the purchase price for each share of common stock purchased under the ESPP will be 85% of the lower of the fair market value per share on the first day of the applicable offering period (or, in the case of the initial offering period, the price at which one share of common stock is offered to the public in its initial public offering) or the fair market value per share on the applicable purchase date. As of April 30, 2018, Market-based Options In September 2016, the Board of Directors of the Company granted 544,127 stock options to the Chief Executive Officer (the “2016 CEO Grant”) under the 2006 Stock Plan with an exercise price of $13.04 per share is eligible to vest based on the achievement of market capital appreciation targets after the consummation of the initial public offering, as well as continuous service over a four-year period following the grant date. an exercise price of $48.47 per share is eligible to vest based on the achievement a stock price appreciation target as well as continuous service over a four-year period following the grant date. As of April 30, 2018 April 30, 2018 Stock-based Compensation The Company’s total stock-based compensation expense as of the dates indicated was as follows (in thousands): Three Months Ended April 30, 2018 2017 Cost of revenue: Subscription services $ 831 $ 355 Professional services and other 946 563 Research and development 2,547 1,152 Sales and marketing 2,970 1,600 General and administrative 4,018 1,607 Total $ 11,312 $ 5,277 Stock-based compensation capitalized in capitalized software development costs was approximately $349,000 at April 30, 2018. Of the total stock-based compensation expense, costs recognized for options granted to non-employees were immaterial for all periods presented. As of April 30, 2018, there was approximately $24.9 million of total unrecognized compensation cost related to unvested stock options granted to employees and non-employee service providers under the Company’s 2006 Stock Plan and 2016 Equity Incentive Plan. This unrecognized compensation cost is expected to be recognized over an estimated weighted-average amortization period of approximately two years. As of April 30, 2018, there was approximately $108.2 million of total unrecognized compensation cost related to unvested restricted stock units granted to employees under the 2016 Equity Incentive Plan. This unrecognized compensation cost is expected to be recognized over an estimated weighted-average amortization period of approximately three years. The fair values of the Company’s stock options granted during the three months ended April 30, 2018 and 2017 were estimated using the following assumptions: Three Months Ended April 30, 2018 2017 Employee Stock Options: Expected term (in years) 6.02 6 Volatility 42.2% 46.0% Risk-free interest rate 2.8% 2.0% - 2.2% Dividend yield - - Employee Stock Purchase Plan: Expected term (in years) 0.5 - 2.0 0.5 - 2.0 Volatility 31.1% - 34.1% 39.3% - 42.6% Risk-free interest rate 2.0% - 2.3% 0.9% - 1.4% Dividend yield - - Market-based Award Expected term (in years) 7.07 - Volatility 43.7% - Risk-free interest rate 2.8% - Dividend yield - - These assumptions and estimates are as follows: • Fair Value of Common Stock . Prior to the initial public offering, the fair value of the shares of common stock underlying stock options was established by the Company’s Board of Directors, which was responsible for these estimates, and was based in part upon a valuation provided by a third-party valuation firm. Because there had been no public market for the Company’s common stock prior to the initial public offering, the Board of Directors considered this independent valuation and other factors, including, but not limited to, revenue growth, the current status of the technical and commercial success of its operations, its financial condition, the stage of development and competition to establish the fair value of the Company’s common stock at the time of grant of the option. After the initial public offering, the Company used the publicly quoted price as reported on the Nasdaq Global Select Market as the fair value of its common stock. • Expected Term . The expected term represents the weighted-average period that the stock options are expected to remain outstanding. To determine the expected term, the Company generally applies the simplified approach in which the expected term of an award is presumed to be the mid-point between the vesting date and the expiration date of the award as the Company does not have sufficient historical exercise data to provide a reasonable basis for an estimate of expected term. The expected term for the employee stock purchase plan ranges from six months, the length of one purchase period, to two years, the length of one offering period. • Risk-Free Interest Rate . The Company bases the risk-free interest rate on the yields of U.S. Treasury securities with maturities approximately equal to the term of employee stock option awards. • Expected Volatility . As the Company does not have an extensive trading history for its common stock, the expected volatility for its common stock has been estimated by taking the historic price volatility for industry peers based on daily price observations over a period equivalent to the expected term of the stock option awards. Industry peers consist of several public companies in its industry.

Convertible Senior Notes

Convertible Senior Notes	3 Months Ended
	Apr. 30, 2018
Debt Disclosure [Abstract]
Convertible Senior Notes	Note 8. Convertible Senior Notes In January 2018, the Company entered into a Purchase Agreement (the “Purchase Agreement”) with certain counterparties relating to the Company’s sale of $230.0 million aggregate principle amount of its 0.375% Convertible Senior Notes due 2023 (the “Convertible Notes”) to the counterparties in a private placement in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”), and for initial resale by the Initial Purchasers to qualified institutional buyers pursuant to the exemption from registration provided by Rule 144A under the Securities Act. The Convertible Notes consisted of a $200.0 million initial placement and an overallotment option that provided the initial purchasers of the Convertible Notes with the option to purchase an additional $30.0 million of the Convertible Notes, which was exercised in full by the counterparties prior to the Convertible Notes issuance. On January 17, 2018, for a total of $230.0 million, the Convertible Notes were issued in accordance with an Indenture (the “Indenture”) between the Company and Wilmington Trust, National Association, as trustee. The net proceeds from the issuance of the Convertible Notes are $200.4 million, net of debt issuance costs, including the underwriting discount and the cash used to purchase the capped call, discussed below. The Convertible Notes are senior, unsecured obligations of the Company, and interest is payable semi-annually in cash at a rate of 0.375% per annum on January 15 and July 15 of each year, beginning on July 15, 2018. The Convertible Notes will mature on January 15, 2023 unless redeemed, repurchased or converted prior to such date. Prior to the close of business on the business day immediately preceding October 15, 2022, the Convertible Notes are convertible at the option of holders during certain periods, upon satisfaction of certain conditions. On or after October 15, 2022, the Convertible Notes are convertible at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. The Convertible Notes will have an initial conversion rate of 22.4685 shares of common stock per $1,000 principal (equivalent to an initial conversion price of approximately $44.5068 per share of its common stock). The conversion rate is subject to customary adjustments for certain events as described in the Indenture. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of its common stock or a combination of cash and shares of its common stock, at its election. It is the Company’s current intent to settle conversions of the Convertible Notes through combination settlement, which involves repayment of the principal portion in cash and any excess of the conversion value over the principal amount in shares of its common stock. Holders may convert their Convertible Notes, at their option, prior to the close of business on the business day immediately preceding October 15, 2022, in multiples of $1,000 principal amount, only under the following circumstances: • during any fiscal quarter commencing after the fiscal quarter ending on April 30, 2018 (and only during such fiscal quarter), if the last reported sale price of its 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 calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; • 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 Convertible Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sales price of the Company’s common stock and the conversion rate on each such trading day; • after the Company’s issuance of a notice of redemption and prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or • upon the occurrence of specified corporate events, as defined in the Indenture. If the Company undergoes a fundamental change, as described in the Indenture, subject to certain conditions, holders may require the Company to repurchase for cash all or any portion of their Convertible Notes. The fundamental change repurchase price is equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest up to, but excluding, the fundamental change repurchase date. If holders elect to convert their Convertible Notes in connection with a make-whole fundamental change, as described in the Indenture, the Company will, to the extent provided in the Indenture, increase the conversion rate applicable to the Convertible Notes. The Convertible Notes are the Company’s senior unsecured obligations and rank senior in right of payment to any of its indebtedness that is expressly subordinated in right of payment to the Convertible Notes, and equal in right of payment to any of its indebtedness that is not so subordinated. The Convertible Notes are effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) and any preferred equity of its current or future subsidiaries. The Indenture contains customary events of default with respect to the Convertible Notes and provides that upon certain events of default occurring and continuing, the Trustee may, and the Trustee at the request of holders of at least 25% in principal amount of the Convertible Notes shall, declare all principal and accrued and unpaid interest, if any, of the Convertible Notes to be due and payable. In case of certain events of bankruptcy, insolvency or reorganization, involving us or a significant subsidiary, all of the principal of and accrued and unpaid interest on the Convertible Notes will automatically become due and payable. In accounting for the issuance of the Convertible Notes, the Company separated the Convertible Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. 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 Convertible Notes as a whole. The difference between the principal amount of the Convertible Notes and the liability component, equal to $62.3 million (the “debt discount”), is amortized to interest expense using the effective interest method over the term of the Convertible Notes. The equity component of the Convertible Notes will not be remeasured as long as it continues to meet the conditions for equity classification. The Company incurred $7.0 million of transaction costs related to the issuance of the Convertible Notes. The Company allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Convertible Notes. Issuance costs attributable to the liability component are being amortized to interest expense over the term of the Convertible Notes using the effective interest method, and issuance costs attributable to the equity component are included along with the equity component in stockholders' equity. The Convertible Notes consisted of the following (in thousands): April 30, 2018 January 31, 2018 Liability: Principal $ 230,000 $ 230,000 Less: debt discount, net of amortization (64,242 ) (66,990 ) Net carrying amount $ 165,758 $ 163,010 Equity $ 60,470 $ 60,470 As of April 30 and January 31, 2018, the debt discount on the Convertible Notes will be amortized over the remaining period of approximately 4.7 years and 5.0 years, respectively. The following table sets forth interest expense recognized related to the Convertible Notes for the three months ended April 30, 2018 (dollars in thousands): Amount Contractual interest expense $ 249 Amortization of debt issuance costs 207 Amortization of debt discount 2,541 Total $ 2,997 Effective interest rate of the liability component 7.66 % As of April 30, 2018, the if-converted value of the Company’s Convertible Notes exceeded the principal amount by $9.6 million. As of January 31, 2018, the if-converted value of the Company's Convertible Notes did not exceed the principal amount. Capped Call In conjunction with the issuance of the Convertible Notes, the Company purchased the Capped Call options on the Company’s stock with certain counterparties at a price of $23.3 million. The Capped Call exercise price is equal to the Convertible Note’s initial conversion price and the cap price is $63.821 per share, subject to certain adjustments under the terms of the capped call transactions. The Capped Call options are exercisable on the same date when the conversion option is exercised. By entering into the Capped Call, the Company expects to reduce the potential dilution to its common stock (or, in the event the conversion is settled in cash, to reduce its cash payment obligation) in the event that at the time of conversion its stock price exceeds the conversion price under the Convertible Notes. The cost of the capped call is not expected to be tax deductible as the Company did not elect to integrate the capped call into the Convertible Notes for tax purposes. The cost of the capped call was recorded as a reduction of the Company’s additional paid-in capital in the accompanying Consolidated Financial Statements.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Apr. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 9 . Commitments and Contingencies Commitments The Company leases office space under non-cancelable operating leases with various expiration dates through April 2024. Rent expense, which is being recognized on a straight-line basis over the lease term, was approximately $1.8 million and $1.0 million for the three months ended April 30, 2018 and 2017, respectively. The difference between the lease payments made and the lease expense recognized to date using the straight-line method is recorded as prepaid expenses and other current assets or accrued expenses and other current liabilities in the accompanying consolidated balance sheet. Additionally, the Company has current contractual purchase obligations for hosting services that support business operations. Future minimum payments by year for the Company’s non-cancelable leases and purchase obligations as of April 30, 2018 are as follows (in thousands): Year Ending January 31, 2019 (remaining nine months) $ 8,904 2020 6,344 2021 6,300 2022 6,219 2023 5,670 Thereafter 6,084 Total $ 39,521 Contingencies The Company may become involved in legal proceedings or be subject to claims arising in the ordinary course of business. Although the results of litigation and claims cannot be predicted with certainty, the Company currently believes that the final outcome of these ordinary course matters will not have a material adverse effect on the Company’s business, operating results, financial condition or cash flows. The Company accrues estimates for resolution of legal and other contingencies when losses are probable and estimable. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors. Warranties and Indemnifications The Company’s cloud-based software platform and applications are typically warranted against material decreases in functionality and to perform in a manner consistent with general industry standards and in accordance with the Company’s on-line documentation under normal use and circumstances. The Company includes service level commitments to its customers, typically regarding certain levels of uptime reliability and performance. If the Company fails to meet those levels, customers can receive credits and in some cases, terminate their relationship with the Company. To date, the Company has not incurred any material costs as a result of such commitments. The Company generally agrees to defend and indemnify its customers against legal claims that the Company’s platform infringes certain patents, copyrights or other intellectual property rights of third parties. To date, the Company has not been required to make any material payment resulting from such infringement claims and has not recorded any related liabilities.

Income Taxes

Income Taxes	3 Months Ended
	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Note 10 . Income Taxes The Company is subject to federal and various state income taxes in the United States as well as income taxes in foreign jurisdictions in which it conducts business. Earnings from non-U.S. activities are subject to local country income tax. The Company does not provide for federal income taxes on the undistributed earnings of its foreign subsidiaries as such earnings are reinvested indefinitely. The Company recorded a tax provision of approximately $490,000 and $84,000 for the three months ended April 30, 2018 and 2017, respectively, representing effective tax rates of (3.27)% and (1.84)% respectively. The increase in the provision for income taxes during the three months ended April 30, 2018 compared to the three months ended April 30, 2017, was primarily due to an increase in the provision for foreign taxes. The difference between the U.S. federal statutory tax rate of 21% and the Company’s effective tax rate in all periods presented is primarily due to a full valuation allowance related to the Company’s U.S. and Canada deferred tax assets offset by foreign tax expense on the Company’s profitable foreign operations. The Company's material income tax jurisdictions are the United States (federal) and California. As a result of net operating loss carryforwards, the Company is subject to audits for tax years 2006 and forward for federal purposes and 2009 and forward for California purposes. There are tax years which remain subject to examination in various other state and foreign jurisdictions that are not material to the Company's financial statements. 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, the transition of U.S. international taxation from a worldwide tax system to a territorial system, and a one-time transition tax on the mandatory deemed repatriation of cumulative foreign earnings as of January 31, 2018. As a result of the reduction in the U.S. corporate income tax rate from 35% to 21% under the Tax Act, the Company revalued its ending net deferred tax assets at January 31, 2018, which were fully offset by a valuation allowance. The Tax Act provided for a one-time deemed mandatory repatriation of post-1986 undistributed foreign subsidiary earnings and profits, or E&P, through the year ended December 31, 2017. The Company has calculated its best estimate of the impact of the Tax Act in its year end income tax provision in accordance with its understanding of the Tax Act and guidance available as of the date of this filing. Based on the preliminary calculation, the effects of the transition tax have been offset by the Company’s available tax credits in the United States. As the Company completes the analysis of the Tax Act, collects and prepares necessary data, and interprets any additional guidance, the Company may make adjustments to its initial assessment. Pursuant to Staff Accounting Bulletin No. 118, adjustments to the provisional amounts recorded by the Company as of January 31, 2018 that are identified within a subsequent measurement period of up to one year from the enactment date will be included as an adjustment to tax expense from continuing operations in the period the amounts are determined.

Net Loss per Share Attributable

Net Loss per Share Attributable to Common Stockholders	3 Months Ended
	Apr. 30, 2018
Earnings Per Share [Abstract]
Net Loss per Share Attributable to Common Stockholders	Note 11 . Net Loss per Share Attributable to Common Stockholders Basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, without consideration for potentially dilutive securities as they do not share in losses. During periods when the Company is in a net loss position, basic net loss per share attributable to common stockholders is the same as diluted net loss per share attributable to common stockholders as the effects of potentially dilutive securities are antidilutive given the net loss of the Company. The following table sets forth the computation of the basic and diluted net loss per share attributable to common stockholders during the three months ended April 30, 2018 and 2017 (in thousands, except per share amounts): Three Months Ended April 30, 2018 2017 Numerator: Net loss attributable to common stockholders $ (15,454 ) $ (10,038 ) Denominator: Weighted-average common shares outstanding 55,873 50,577 Net loss per share attributable to common stockholders, basic and diluted $ (0.28 ) $ (0.20 ) 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 for all periods 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: As of April 30, 2018 2017 Options to purchase common stock 8,993,000 11,796,698 RSUs 3,178,573 1,589,620 Unvested common shares subject to repurchase 410,839 293,731 Shares committed under the ESPP 74,602 66,266 Total 12,657,014 13,746,315 Additionally, approximately 5.2 million shares underlying the conversion option in the Convertible Notes are not considered in the calculation of diluted net loss per share as the effect would be anti-dilutive. The Company uses the treasury stock method for calculating any potential dilutive effect of the conversion option on diluted net income per share, if applicable. During the three months ended April 30, 2018, the average market price of the Company’s common stock exceeded the conversion price of the Convertible Notes of $44.51 per share. However, the conversion option is not included in the dilutive per share calculation as the Company is in a net loss position and the inclusion would be anti-dilutive.

Business Segment Information

Business Segment Information	3 Months Ended
	Apr. 30, 2018
Segment Reporting [Abstract]
Business Segment Information	Note 12. Business Segment Information The Company’s chief operating decision maker is the Chief Executive Officer (“CEO”). The CEO reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluating the Company’s financial performance. Accordingly, the Company has determined that it operates in a single reporting segment: cloud platform.

Significant Customers and Geogr

Significant Customers and Geographic Information	3 Months Ended
	Apr. 30, 2018
Geographic Areas Revenues From External Customers [Abstract]
Significant Customers and Geographic Information	Note 13 . Significant Customers and Geographic Information No customer balance comprised 10% or more of total accounts receivable at April 30, 2018 or January 31, 2018. During the three months ended April 30, 2018 and 2017, revenues by geographic area, based on billing addresses of the customers, were as follows (in thousands): Three Months Ended April 30, 2018 2017 United States $ 34,475 $ 27,311 Foreign countries 21,877 13,826 Total revenues $ 56,352 $ 41,137 No single foreign country represented more than 10% of the Company’s revenues in any period. Additionally, no single customer represented more than 10% of the Company’s revenues in any period.

Related Parties

Related Parties	3 Months Ended
	Apr. 30, 2018
Related Party Transactions [Abstract]
Related Parties	Note 14. Related Parties One of the Company’s customers, T. Rowe Associates, Inc., is an investment adviser of certain of the Company’s stockholders. The Company recognized subscription revenue from this customer of approximately $153,000 and $130,000 for the three months ended April 30, 2018, respectively. The Company had no outstanding receivables from this customer as of April 30, 2018 or January 31, 2018.

Significant Accounting Polici21

Significant Accounting Policies (Policies)	3 Months Ended
	Apr. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared using accounting principles generally accepted in the United States of America (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended January 31, 2018 filed with the SEC on March 28, 2018 (the “Form 10-K”). The consolidated financial statements include the results of the Company and its wholly owned subsidiaries. All significant intercompany transactions and balances have been eliminated during consolidation. The 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 GAAP on an annual reporting basis. Certain amounts in the condensed consolidated financial statements and notes to the condensed consolidated financial statements for the prior period have been reclassified to conform to the presentation for the three months ended April 30, 2018. Net operating results have not been affected by these reclassifications. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results to be expected for the full fiscal year or any other period. There have been no changes to our significant accounting policies described in the Form 10-K for the year ended January 31, 2018 except for changes applied due to the adoption of ASU No. 2014-09, Revenue from Contracts with Customers. Refer to “Recently Adopted Accounting Pronouncements.”
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, management evaluates its significant estimates including, but not limited to, the valuation of accounts receivable, the lives of tangible and intangible assets, stock-based compensation, the valuation of acquired intangible assets and the recoverability or impairment of tangible and intangible assets, including goodwill, stock-based compensation, revenue recognition, the valuation of acquired assets and liabilities assumed, convertible senior notes fair value, the benefit period of deferred commissions, and provisions for income taxes. Management bases its estimates on historical experience and on various other market-specific and relevant assumptions that management believes to be reasonable under the circumstances. Actual results could differ from those estimates and such differences could be material to the financial position and results of operations.
Concentration of Risk	Concentration of Risk Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash and cash equivalents and accounts receivable. Cash deposits may, at times, exceed amounts insured by the Federal Deposit Insurance Corporation and the Securities Investor Protection Corporation. The Company has not experienced any losses on its deposits of cash and cash equivalents to date.
Comprehensive Loss	Comprehensive Loss Comprehensive loss is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company’s comprehensive loss consists of net loss and other comprehensive loss. Other comprehensive loss represents net deferred gains and losses and prior service costs and credits for defined benefit pension plans.
Revenue Recognition	Revenue Recognition The Company derives its revenues primarily from subscription services fees and professional services fees. Revenues are recognized when control of these services are transferred to the Company’s customers in an amount that reflects the consideration expected to be entitled to in exchange for those services. Revenues are recognized net of applicable taxes imposed on the related transaction. The Company’s revenue recognition policy follows guidance from Accounting Standards Codification 606, Revenue from Contracts with Customers (Topic 606) . The Company determines revenue recognition through the following five-step framework: • Identification of the contract, or contracts, with a customer; • Identification of the performance obligations in the contract; • Determination of the transaction price; • Allocation of the transaction price to the performance obligations in the contract; and • Recognition of revenue when, or as, the Company satisfies a performance obligation. Subscription Services Revenues The Company offers subscriptions to its cloud-based business spend management platform, including procurement, invoicing and expense management. Subscription services revenues consist primarily of fees to provide the Company’s customers access to its cloud-based platform, which includes routine customer support. Subscription service contracts do not provide customers with the right to take possession of the software, are non-cancelable, and do not contain general rights of return. Revenues are recognized ratably over the contractual term of the arrangement, beginning on the date that the service is made available to the customer. Subscription contracts typically have a term of three years with invoicing occurring in annual installments at the beginning of each year in the subscription period. Professional Services Revenues The Company offers professional services which include deployment services, optimization services, and training. Professional services are generally sold on a fixed-fee or time-and-materials basis. For services billed on a fixed-fee basis, invoicing typically occurs in advance, and revenue is recognized over time based on the proportion performed. For services billed on a time-and-materials basis, revenue is recognized over time as services are performed. Refer to Note 13, “Significant Customers and Geographic Information” for additional information on disaggregated revenue during the period. Significant Judgments The Company’s contracts with customers often include promises to transfer multiple products and services to a customer. For these contracts, the Company accounts for individual performance obligations separately if they are distinct. Subscription services and professional services are both distinct performance obligations that are accounted for separately. In contracts with multiple performance obligations, the transaction price is allocated to separate performance obligations on a relative standalone selling price basis. The determination of standalone selling price (“SSP”) for each distinct performance obligations requires judgment. The Company determines SSP for performance obligatons based on overall pricing objectives, which take into consideration market conditions and entity-specific factors. This includes a review of historical data related to the size of arrangements, the cloud applications being sold, customer demographics and the numbers and types of users within the arrangements. The Company uses a range of amounts to estimate SSP for performance obligations. There is typically more than one SSP for individual products and services due to the stratification of those products and services by information such as size and type of customer. Contract Balances The timing of revenue recognition may differ from the timing of invoicing for contracts with customers. The Company records a receivable when revenue is recognized prior to invoicing, or deferred revenue when revenue is recognized subsequent to invoicing. Subscription services and certain professional services arrangements are commonly billed in advance which results in a deferred revenue balance amortized as revenue is recognized over time. However, other professional services arrangements, primarily those recognized on a time-and-materials basis, are billed in arrears following services that have been rendered. This may result in revenue recognition greater than invoiced amounts which results in a receivable balance. Receivables represent an unconditional right to payment. As of April 30, 2018 and January 31, 2018, the balance of accounts receivable, net of the allowance for doubtful accounts, was $47.1 million and $61.4 million, respectively. Of these balances, $1.0 million and $1.2 million represent unbilled receivable amounts as of April 30, 2018 and January 31, 2018, respectively. When the timing of revenue recognition differs from the timing of invoicing, the Company uses judgment to determine whether the contract includes a significant financing component requiring adjustment to the transaction price. Various factors are considered in this determination including the duration of the contract, payment terms, and other circumstances. Generally, the Company determined that contracts do not include a significant financing component. At any point in the contract term, transaction price may be allocated to performance obligations that are unsatisfied or are partially unsatisfied. These amounts relate to remaining performance obligations on non-cancelable contracts which include both the deferred revenue balance and amounts that will be invoiced and recognized as revenue in future periods. As of April 30, 2018, approximately $340.8 million of revenue is expected to be recognized from remaining performance obligations, a majority of which is related to multi-year subscription arrangements. The Company expects to recognize revenue on approximately three fourths of these remaining performance obligations within the next 24 months and the remainder thereafter. The Company applies the practical expedient to exclude remaining performance obligations that are part of contracts with an original expected duration of one year or less. During the three months ended April 30, 2018, the revenue recognized from performance obligations satisfied in prior periods was not material.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts The Company extends credit to its customers in the normal course of business, and does not require cash collateral or other security to support the collection of customer receivables. The Company estimates the amount of uncollectible accounts receivable at the end of each reporting period based on the aging of the receivable balance, historical experience, and communications with customers, and provides a reserve when needed. Accounts receivable are written off when deemed uncollectible. The allowance for doubtful accounts was not material at April 30, 2018 and January 31, 2018.
Deferred Revenue	Deferred Revenue Deferred revenue consists of customer billings or payments received in advance of the recognition of revenue and is recognized as revenue as the revenue recognition criteria are met. The Company generally invoices its customers annually for the forthcoming year of service. Accordingly, the Company’s deferred revenue balance does not include revenue for future years of multiple year non-cancellable contracts that have not yet been billed. During the three months ended April 30, 2018, the Company recognized revenue of $47.8 million that was included in the deferred revenue balance as of January 31, 2018.
Deferred Commissions	Deferred Commissions Commissions are earned by sales personnel upon the execution of the sales contract by the customer, and commission payments are made shortly after they are earned. Commission costs can be associated specifically with subscription and professional services arrangements. Commissions earned by the Company’s sales personnel are considered incremental and recoverable costs of obtaining a contract with a customer. These costs are deferred and then amortized over a period of benefit of five years. The Company determined the period of benefit by taking into consideration its past experience with customers, present value of future cash flows, industry peers and other available information. The current portion of deferred commissions was $4.9 million and $3.8 million at April 30, 2018 and January 31, 2018, respectively. The noncurrent portion of deferred commissions was $12.5 million and $3.9 million at April 30, 2018 and January 31, 2018, respectively. For the three months ended April 30, 2018, $1.2 million of deferred commissions were amortized to sales and marketing expense in the accompanying condensed consolidated statements of operations.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Revenue from Contracts with Customers In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) which provided a comprehensive model for entities to use in accounting for revenue arising from contracts with customers. Revenue Recognition Topic 606 also includes Subtopic 340-40 which provides accounting guidance for incremental costs of obtaining a contract with a customer. The Company refers to Topic 606 and Subtopic 340-40 collectively as the “new revenue standard.” The Company adopted the new revenue standard effective on February 1, 2018 using the modified retrospective method applied to all contracts not completed as of the adoption date. Results for reporting periods beginning on February 1, 2018 are presented under the new revenue standard, while comparative results have not been restated. The primary impact of adopting the new revenue standard relates to Subtopic 340-40 and the deferral of incremental commission costs to obtain contracts with customers. Under Topic 605, the Company deferred only direct and incremental commission costs to obtain a contract and amortized those costs over the non-cancelable contract term. Under the new revenue standard, the Company defers all incremental commission costs to obtain the contract. The Company amortizes these costs over a period of benefit of five years. The adoption of the new revenue standard also removed the limitation on contingent revenue under Topic 605 which impacted revenue recognition and is reflected in the changes to the Company’s revenue recognition accounting policy. The following table summarizes the cumulative impact of adoption of the new revenue standard for revenue recognition on line items within the Condensed Consolidated Balance Sheets (in thousands): As of January 31, 2018 As Previously Reported Adjustments for the New Revenue Standard As Adjusted Assets Deferred commissions, current portion $ 3,756 $ 778 $ 4,534 Deferred commissions, net of current portion 3,896 8,257 12,153 Liabilities and Stockholders’ Equity Deferred revenue, current portion 125,714 (1,732 ) 123,982 Deferred revenue, net of current portion 2,316 (10) 2,306 Accumulated deficit (204,481 ) 10,777 (215,258) The impact of adoption on the condensed consolidated statements of operations and condensed consolidated statements of cash flows for the three months ended April 30, 2018 was immaterial. The impact to sales and marketing expense within the condensed consolidated statements of operations was a decrease of approximately $808,000 due to deferred commission costs that would have been expensed prior to adoption of the new standard. The following table summarizes the effects of the new revenue standard for revenue recognition on line items within the Condensed Consolidated Balance Sheets (in thousands): As of April 30, 2018 Prior to Adoption of the New Revenue Standard Adjustments for the New Revenue Standard As Adjusted Assets Deferred commissions, current portion $ 3,797 $ 1,086 $ 4,883 Deferred commissions, net of current portion 3,784 8,757 12,541 Liabilities and Stockholders’ Equity Deferred revenue, current portion 122,139 (1,681 ) 120,458 Deferred revenue, net of current portion 1,435 (7 ) 1,428 Accumulated deficit (202,998 ) 11,531 (214,529) In October 2016, the FASB issued ASU No. 2016-16, Intra-Entity Transfers of Assets Other Than Inventory In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash In March 2017, the FASB issued ASU No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (Topic 715) In May 2017, the FASB issued ASU 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting
New Accounting Pronouncements Not Yet Adopted	New Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, Leases In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment In July 2017, the FASB issued ASU 2017-11, Earnings Per Share (Topic 260)-Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part I) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception (“ASU 2017-11”). The amendments in Part I ASU 2017-11 change the classification analysis of certain equity-linked financial instruments (or embedded features) with down round features. When determining whether certain financial instruments should be classified as liabilities or equity instruments a down round feature no longer precludes equity classification when assessing whether the instrument is indexed to an entity’s own stock. The amendments in Part II of ASU 2017-11recharacterize the indefinite deferral of certain provisions of Topic 480 with a scope exception and do not have an accounting effect. This accounting standard update is effective for annual periods beginning after December 15, 2018, and interim periods within those annual periods. The Company is currently evaluating the impact of adopting ASU 2017-11 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 The Company is currently evaluating the impact of adopting ASU 2018-02 on its consolidated financial statements.

Significant Accounting Polici22

Significant Accounting Policies (Tables)	3 Months Ended
	Apr. 30, 2018
ASU 2014-09
Summary of Effects of New Revenue Standard for Revenue Recognition on Condensed Consolidated Balance Sheets Line Items	The following table summarizes the cumulative impact of adoption of the new revenue standard for revenue recognition on line items within the Condensed Consolidated Balance Sheets (in thousands): As of January 31, 2018 As Previously Reported Adjustments for the New Revenue Standard As Adjusted Assets Deferred commissions, current portion $ 3,756 $ 778 $ 4,534 Deferred commissions, net of current portion 3,896 8,257 12,153 Liabilities and Stockholders’ Equity Deferred revenue, current portion 125,714 (1,732 ) 123,982 Deferred revenue, net of current portion 2,316 (10) 2,306 Accumulated deficit (204,481 ) 10,777 (215,258) The following table summarizes the effects of the new revenue standard for revenue recognition on line items within the Condensed Consolidated Balance Sheets (in thousands): As of April 30, 2018 Prior to Adoption of the New Revenue Standard Adjustments for the New Revenue Standard As Adjusted Assets Deferred commissions, current portion $ 3,797 $ 1,086 $ 4,883 Deferred commissions, net of current portion 3,784 8,757 12,541 Liabilities and Stockholders’ Equity Deferred revenue, current portion 122,139 (1,681 ) 120,458 Deferred revenue, net of current portion 1,435 (7 ) 1,428 Accumulated deficit (202,998 ) 11,531 (214,529)

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Apr. 30, 2018
Simeno
Summary of Major Classes of Assets and Liabilities Allocated the Fair Value of Purchase Consideration	The major classes of assets and liabilities to which the Company has allocated the fair value of purchase consideration were as follows: (in thousands): December 1, 2017 Cash and cash equivalents $ 747 Accounts receivable 1,912 Intangible assets 3,820 Other assets 331 Deferred tax assets, net 285 Goodwill 7,264 Accounts payable and other liabilities (1,405 ) Pension plan obligation (4,226 ) Total consideration $ 8,728
Summary of Intangible Assets Acquired Based on Valuation	The Company determined the fair values of intangible assets acquired and liabilities assumed with the assistance of third party valuation consultants. Based on this valuation, the intangible assets acquired are (in thousands): Fair Value Useful life (in Years) Developed technology $ 2,300 4 Customer relationships 1,520 4 Total intangible assets $ 3,820
Trade Extensions
Summary of Major Classes of Assets and Liabilities Allocated the Fair Value of Purchase Consideration	The major classes of assets and liabilities to which the Company has allocated the fair value of purchase consideration were as follows: (in thousands): May 3, 2017 Cash and cash equivalents $ 2,016 Accounts receivable 1,172 Intangible assets 12,960 Other assets 2,086 Goodwill 30,840 Accounts payable and other liabilities (8,125 ) Total consideration $ 40,949
Summary of Intangible Assets Acquired Based on Valuation	The Company determined the fair values of intangible assets acquired with the assistance of third party valuation consultants. Based on this valuation, the intangible assets acquired are (in thousands): Fair Value Useful life (in Years) Developed technology $ 9,700 7 Customer relationships 3,100 5 Trademarks 160 1 Total intangible assets $ 12,960

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Apr. 30, 2018
Fair Value Disclosures [Abstract]
Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis (in thousands): Level 1 Level 2 Level 3 Total April 30, 2018 Money market funds (1) $ 406,132 $ — $ — $ 406,132 January 31, 2018 Money market funds (1) 389,357 — — 389,357 (1) Included in cash and cash equivalents.

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	3 Months Ended
	Apr. 30, 2018
Property Plant And Equipment [Abstract]
Property and Equipment	Property and equipment consisted of the following (in thousands): April 30, January 31, 2018 2018 Furniture and equipment $ 2,162 $ 1,897 Software development costs 17,529 16,574 Leasehold improvements 709 557 Construction in progress 25 149 Total property and equipment 20,425 19,177 Less: accumulated depreciation and amortization (15,014 ) (13,991 ) Property and equipment, net $ 5,411 $ 5,186

Goodwill and Other Intangible26

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Apr. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Other Intangible Asset Balances	The following table summarizes the other intangible asset balances (in thousands): As of April 30, 2018 January 31, 2018 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Developed technology $ 20,035 $ (4,937 ) 15,098 $ 19,385 $ (4,153 ) 15,232 Customer relationships 4,694 (847 ) 3,847 4,694 (597 ) 4,097 Trademarks 160 (159 ) 1 160 (119 ) 41 In-process research and development — — — 650 — 650 Total other intangible assets $ 24,889 $ (5,943 ) $ 18,946 $ 24,889 $ (4,869 ) $ 20,020
Future Amortization Expense of Other Intangible Assets	As of April 30, 2018, the future amortization expense of other intangible assets is as follows (in thousands): Year Ending January 31, 2019 (remaining nine months) $ 3,271 2020 4,283 2021 4,264 2022 3,839 2023 1,546 Thereafter 1,743 Total $ 18,946

Common Stock and Stockholders27

Common Stock and Stockholders' Equity (Tables)	3 Months Ended
	Apr. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity	The following table summarizes stock option activity under the Company’s 2006 Stock Plan and the 2016 Plan during the three months ended April 30, 2018 (aggregate intrinsic value in thousands): Options Outstanding Outstanding Stock Options Weighted- Average Exercise Price Weighted- Average Remaining Contractual (in Years) Aggregate Intrinsic Value Balance at January 31, 2018 9,301,253 $ 7.19 7.30 $ 288,713 Option grants 553,697 $ 48.47 — — Options exercised (781,109 ) $ 4.22 — — Options forfeited (80,841 ) $ 9.19 — — Balance at April 30, 2018 8,993,000 $ 9.97 7.30 $ 328,495 Vested and expected to vest at April 30, 2018 8,993,000 $ 9.97 7.30 $ 328,495 Exercisable at April 30, 2018 5,432,755 $ 5.75 6.72 $ 220,679
Summary of Activity Related to RSUs	The following table summarizes the activity related to the Company’s RSUs: Number of RSUs Outstanding Weighted-Average Grant Date Fair Value Awarded and unvested at January 31, 2018 1,971,778 $ 27.14 Awards granted 1,420,032 $ 48.03 Awards vested (115,833 ) $ 24.46 Awards forfeited (97,404 ) $ 30.52 Awarded and unvested at April 30, 2018 3,178,573 $ 36.47
Total Stock-Based Compensation Expense	The Company’s total stock-based compensation expense as of the dates indicated was as follows (in thousands): Three Months Ended April 30, 2018 2017 Cost of revenue: Subscription services $ 831 $ 355 Professional services and other 946 563 Research and development 2,547 1,152 Sales and marketing 2,970 1,600 General and administrative 4,018 1,607 Total $ 11,312 $ 5,277
Assumptions used to Estimate Fair Values of Stock Options Granted	The fair values of the Company’s stock options granted during the three months ended April 30, 2018 and 2017 were estimated using the following assumptions: Three Months Ended April 30, 2018 2017 Employee Stock Options: Expected term (in years) 6.02 6 Volatility 42.2% 46.0% Risk-free interest rate 2.8% 2.0% - 2.2% Dividend yield - - Employee Stock Purchase Plan: Expected term (in years) 0.5 - 2.0 0.5 - 2.0 Volatility 31.1% - 34.1% 39.3% - 42.6% Risk-free interest rate 2.0% - 2.3% 0.9% - 1.4% Dividend yield - - Market-based Award Expected term (in years) 7.07 - Volatility 43.7% - Risk-free interest rate 2.8% - Dividend yield - -

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	3 Months Ended
	Apr. 30, 2018
Debt Instruments [Abstract]
Schedule of Components of Convertible Senior Notes	The Convertible Notes consisted of the following (in thousands): April 30, 2018 January 31, 2018 Liability: Principal $ 230,000 $ 230,000 Less: debt discount, net of amortization (64,242 ) (66,990 ) Net carrying amount $ 165,758 $ 163,010 Equity $ 60,470 $ 60,470
Summary of Interest Expense Recognized Related to Convertible Notes	The following table sets forth interest expense recognized related to the Convertible Notes for the three months ended April 30, 2018 (dollars in thousands): Amount Contractual interest expense $ 249 Amortization of debt issuance costs 207 Amortization of debt discount 2,541 Total $ 2,997 Effective interest rate of the liability component 7.66 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Apr. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Payments for Non-cancellable Leases and Purchase Obligations	Future minimum payments by year for the Company’s non-cancelable leases and purchase obligations as of April 30, 2018 are as follows (in thousands): Year Ending January 31, 2019 (remaining nine months) $ 8,904 2020 6,344 2021 6,300 2022 6,219 2023 5,670 Thereafter 6,084 Total $ 39,521

Net Loss per Share Attributab30

Net Loss per Share Attributable to Common Stockholders (Tables)	3 Months Ended
	Apr. 30, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders	The following table sets forth the computation of the basic and diluted net loss per share attributable to common stockholders during the three months ended April 30, 2018 and 2017 (in thousands, except per share amounts): Three Months Ended April 30, 2018 2017 Numerator: Net loss attributable to common stockholders $ (15,454 ) $ (10,038 ) Denominator: Weighted-average common shares outstanding 55,873 50,577 Net loss per share attributable to common stockholders, basic and diluted $ (0.28 ) $ (0.20 )
Potentially Dilutive Securities Not Included in 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: As of April 30, 2018 2017 Options to purchase common stock 8,993,000 11,796,698 RSUs 3,178,573 1,589,620 Unvested common shares subject to repurchase 410,839 293,731 Shares committed under the ESPP 74,602 66,266 Total 12,657,014 13,746,315

Significant Customers and Geo31

Significant Customers and Geographic Information (Tables)	3 Months Ended
	Apr. 30, 2018
Geographic Areas Revenues From External Customers [Abstract]
Revenues by Geographic Area	During the three months ended April 30, 2018 and 2017, revenues by geographic area, based on billing addresses of the customers, were as follows (in thousands): Three Months Ended April 30, 2018 2017 United States $ 34,475 $ 27,311 Foreign countries 21,877 13,826 Total revenues $ 56,352 $ 41,137

Significant Accounting Polici32

Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Significant Accounting Policies [Line Items]
Subscriptions revenue contracts term	3 years
Accounts receivable, net of allowances	$ 47,052,000		$ 61,366,000
Unbilled receivables	1,000,000		1,200,000
Revenue recognized from deferred revenue	$ 47,800,000
Deferred commission, amortization period	5 years
Deferred commissions, current portion	$ 4,883,000		3,756,000
Deferred commissions, noncurrent portion	12,541,000		3,896,000
Amortization of deferred commissions	1,192,000	$ 1,040,000
Sales and marketing expense	(24,660,000)	$ (20,679,000)
ASU 2014-09
Significant Accounting Policies [Line Items]
Deferred commissions, current portion			4,534,000
Deferred commissions, noncurrent portion			12,153,000
ASU 2014-09 | Adjustments for the New Revenue Standard
Significant Accounting Policies [Line Items]
Deferred commissions, current portion	1,086,000		778,000
Deferred commissions, noncurrent portion	8,757,000		$ 8,257,000
Sales and marketing expense	808,000
ASU 2016-16 | Deferred Tax Charge
Significant Accounting Policies [Line Items]
Reduction of deferred tax charge	$ 5,600,000
Maximum
Significant Accounting Policies [Line Items]
Payment terms of customers	30 days

Significant Accounting Polici33

Significant Accounting Policies - Additional Information (Details1) $ in Millions	Apr. 30, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-31
Significant Accounting Policies [Line Items]
Revenue expected to be recognized from remaining performance obligation with in next 24 months	75.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: (nil)
Significant Accounting Policies [Line Items]
Revenue expected to be recognized from remaining performance obligation	$ 340.8

Significant Accounting Polici34

Significant Accounting Policies - Summary of Effects of New Revenue Standard for Revenue Recognition on Condensed Consolidated Balance Sheets Line Items (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Assets
Deferred commissions, current portion	$ 4,883	$ 3,756
Deferred commissions, net of current portion	12,541	3,896
Liabilities and Stockholders’ Equity
Deferred revenue, current portion	120,458	125,714
Deferred revenue, net of current portion	1,428	2,316
Accumulated deficit	(214,529)	(204,481)
ASU 2014-09
Assets
Deferred commissions, current portion		4,534
Deferred commissions, net of current portion		12,153
Liabilities and Stockholders’ Equity
Deferred revenue, current portion		123,982
Deferred revenue, net of current portion		2,306
Accumulated deficit		(215,258)
ASU 2014-09 | Adjustments for the New Revenue Standard
Assets
Deferred commissions, current portion	1,086	778
Deferred commissions, net of current portion	8,757	8,257
Liabilities and Stockholders’ Equity
Deferred revenue, current portion	(1,681)	(1,732)
Deferred revenue, net of current portion	(7)	(10)
Accumulated deficit	11,531	$ 10,777
ASU 2014-09 | Prior to Adoption of the New Revenue Standard
Assets
Deferred commissions, current portion	3,797
Deferred commissions, net of current portion	3,784
Liabilities and Stockholders’ Equity
Deferred revenue, current portion	122,139
Deferred revenue, net of current portion	1,435
Accumulated deficit	$ (202,998)

Business Combinations - Additio

Business Combinations - Additional Information (Details) - USD ($)	Dec. 01, 2017	May 03, 2017	Apr. 30, 2018	Jan. 31, 2018
Simeno
Acquired Finite Lived Intangible Assets [Line Items]
Business acquisition, effective date of acquisition	Dec. 1, 2017
Business acquisition consideration paid in cash	$ 8,700,000
Amount held in escrow deposit	1,500,000
Stock issued during period, value acquisitions	$ 8,000,000
Number of common stock issued under purchase consideration	221,257
Pension plan obligation	$ 4,226,000
Acquisition related costs			$ 0	$ 445,000
Trade Extensions
Acquired Finite Lived Intangible Assets [Line Items]
Business acquisition, effective date of acquisition		May 3, 2017
Business acquisition consideration paid in cash		$ 40,900,000
Amount held in escrow deposit		7,200,000
Stock issued during period, value acquisitions		$ 4,100,000
Number of common stock issued under purchase consideration		148,476
Acquisition related costs				$ 526,000
Escrow deposit held in period		18 months
Trade Extensions | Other assets
Acquired Finite Lived Intangible Assets [Line Items]
Business combination, indemnification assets		$ 1,400,000

Business Combinations - Summary

Business Combinations - Summary of Major Classes of Assets and Liabilities Allocated the Purchase Price (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018	Dec. 01, 2017	May 03, 2017
Business Acquisition [Line Items]
Goodwill	$ 44,410	$ 44,410
Simeno
Business Acquisition [Line Items]
Cash and cash equivalents			$ 747
Accounts receivable			1,912
Intangible assets			3,820
Other assets			331
Deferred tax assets, net			285
Goodwill			7,264
Accounts payable and other liabilities			(1,405)
Pension plan obligation			(4,226)
Total consideration			$ 8,728
Trade Extensions
Business Acquisition [Line Items]
Cash and cash equivalents				$ 2,016
Accounts receivable				1,172
Intangible assets				12,960
Other assets				2,086
Goodwill				30,840
Accounts payable and other liabilities				(8,125)
Total consideration				$ 40,949

Business Combinations - Summa37

Business Combinations - Summary of Intangible Assets Acquired Based on Valuation (Details) - USD ($) $ in Thousands	Dec. 01, 2017	May 03, 2017
Simeno
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets, Fair Value	$ 3,820
Simeno | Developed technology
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets, Fair Value	$ 2,300
Useful life (in Years)	4 years
Simeno | Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets, Fair Value	$ 1,520
Useful life (in Years)	4 years
Trade Extensions
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets, Fair Value		$ 12,960
Trade Extensions | Developed technology
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets, Fair Value		$ 9,700
Useful life (in Years)		7 years
Trade Extensions | Customer relationships
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets, Fair Value		$ 3,100
Useful life (in Years)		5 years
Trade Extensions | Trademarks
Acquired Finite Lived Intangible Assets [Line Items]
Intangible Assets, Fair Value		$ 160
Useful life (in Years)		1 year

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair value measurements recurring - Money market funds - USD ($) $ in Thousands		Apr. 30, 2018	Jan. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Money market funds	[1]	$ 406,132	$ 389,357
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Money market funds	[1]	$ 406,132	$ 389,357
[1]	Included in cash and cash equivalents.

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) $ in Millions	Apr. 30, 2018USD ($)
Fair Value Disclosures [Abstract]
Fair value of convertible notes	$ 280.6

Property and Equipment, Net - P

Property and Equipment, Net - Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 20,425	$ 19,177
Less: accumulated depreciation and amortization	(15,014)	(13,991)
Property and equipment, net	5,411	5,186
Furniture and equipment
Property Plant And Equipment [Line Items]
Total property and equipment, gross	2,162	1,897
Software development costs
Property Plant And Equipment [Line Items]
Total property and equipment, gross	17,529	16,574
Leasehold improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	709	557
Construction in progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 25	$ 149

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Property Plant And Equipment [Abstract]
Depreciation and amortization expense excluding software development costs	$ 196,000	$ 115,000
Amortization expense related to software development costs	$ 826,000	$ 989,000

Goodwill and Other Intangible42

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 44,410,000		$ 44,410,000
Amortization expense related to other intangible assets	$ 1,100,000	$ 485,000

Goodwill and Other Intangible43

Goodwill and Other Intangible Assets - Summary of Other Intangible Asset Balances (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 24,889	$ 24,889
Accumulated Amortization	(5,943)	(4,869)
Net Carrying Amount	18,946	20,020
Developed technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	20,035	19,385
Accumulated Amortization	(4,937)	(4,153)
Net Carrying Amount	15,098	15,232
Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,694	4,694
Accumulated Amortization	(847)	(597)
Net Carrying Amount	3,847	4,097
Trademarks
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	160	160
Accumulated Amortization	(159)	(119)
Net Carrying Amount	$ 1	41
In-process research and development
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		650
Net Carrying Amount		$ 650

Goodwill and Other Intangible44

Goodwill and Other Intangible Assets - Future Amortization Expense of Other Intangible Assets (Details) $ in Thousands	Apr. 30, 2018USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2019 (remaining nine months)	$ 3,271
2,020	4,283
2,021	4,264
2,022	3,839
2,023	1,546
Thereafter	1,743
Total	$ 18,946

Common Stock and Stockholders45

Common Stock and Stockholders' Equity - Additional Information (Details)	1 Months Ended		3 Months Ended		147 Months Ended
	Mar. 31, 2018$ / sharesshares	Sep. 30, 2016$ / sharesshares	Apr. 30, 2018USD ($)VotePeriod$ / sharesshares	Apr. 30, 2017USD ($)$ / shares	Apr. 30, 2018USD ($)Vote$ / sharesshares	Jan. 31, 2018$ / sharesshares
Class Of Stock [Line Items]
Common stock voting rights			Each share of common stock has the right to one vote.
Number of common stock voting rights | Vote			1		1
Dividends declared | $					$ 0
Dividends paid | $					$ 0
Preferred stock, shares authorized			25,000,000		25,000,000	25,000,000
Preferred stock, par value | $ / shares			$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares issued			0		0	0
Preferred stock, shares outstanding			0		0	0
Aggregate intrinsic value of exercised options | $			$ 32,100,000	$ 27,700,000
Weighted-average grant date fair value of options granted | $ / shares			$ 21.56	$ 11.04
Number of unvested shares subject to repurchase due to early exercises of options			38,189		38,189
Stock-based compensation expense recognized for market-based awards | $			$ 11,312,000	$ 5,277,000
Capitalized Software Development Costs
Class Of Stock [Line Items]
Stock-based compensation capitalized in capitalized software development costs | $			$ 349,000
2016 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Common stock available for future issuance			1,188,527		1,188,527
Increase in number of shares reserved for issuance as percentage of outstanding shares of common stock on last day of prior fiscal year			1.00%
Increase in common stock reserved for issuance			1,250,000		1,250,000
Duration of maximum offering period			27 months
Initial offering period end date			Sep. 15, 2018
Duration of new offering period			24 months
Number of consecutive purchase periods | Period			4
Duration of consecutive purchase period			6 months
Maximum percentage of eligible compensation for participants to purchase common stock through payroll deductions			15.00%		15.00%
Purchase price for each share of common stock as percentage of lower of fair market value per share on first day of applicable offering period			85.00%
Number of shares of common stock purchased			689,807
Total unrecognized compensation cost | $			$ 4,400,000		$ 4,400,000
Total unrecognized compensation cost, weighted-average amortization period			1 year
Accrued Expenses and Other Current Liabilities
Class Of Stock [Line Items]
Early exercises of stock options | $			$ 243,000		$ 243,000
2016 Equity Incentive Plan
Class Of Stock [Line Items]
Common stock available for future issuance			6,213,870		6,213,870
Increase in number of shares reserved for issuance as percentage of outstanding shares of common stock on last day of prior fiscal year			5.00%
2016 Equity Incentive Plan | Restricted Stock Units (RSUs)
Class Of Stock [Line Items]
Total unrecognized compensation cost, weighted-average amortization period			3 years
Total unrecognized compensation cost related to unvested restricted stock units | $			$ 108,200,000		$ 108,200,000
2006 Stock Plan | Market-based Options | Chief Executive Officer
Class Of Stock [Line Items]
Number of stock options granted		544,127
Stock options granted, exercise price | $ / shares		$ 13.04
Stock option vesting period		4 years
Stock option, number of shares vested and exercisable			215,383		215,383
Stock-based compensation expense recognized for market-based awards | $			$ 642,000	322,000
2016 Equity Plan | Market-based Options | Chief Executive Officer
Class Of Stock [Line Items]
Number of stock options granted	334,742
Stock options granted, exercise price | $ / shares	$ 48.47
Stock option vesting period	4 years
Stock option, number of shares vested and exercisable			0		0
Stock-based compensation expense recognized for market-based awards | $			$ 642,000	$ 322,000
2006 Stock Plan and 2016 Equity Incentive Plan
Class Of Stock [Line Items]
Number of stock options granted			553,697
Stock options granted, exercise price | $ / shares			$ 48.47
Total unrecognized compensation cost related to unvested stock options | $			$ 24,900,000		$ 24,900,000
2006 Stock Plan and 2016 Equity Incentive Plan | Employee Stock Options
Class Of Stock [Line Items]
Total unrecognized compensation cost, weighted-average amortization period			2 years

Common Stock and Stockholders46

Common Stock and Stockholders' Equity - Summary of Stock Option Activity (Details) - 2006 Stock Plan and 2016 Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options, Outstanding, Beginning Balance	9,301,253
Stock Options, grants	553,697
Stock Options, exercised	(781,109)
Stock Options, forfeited	(80,841)
Stock Options, Outstanding, Ending Balance	8,993,000	9,301,253
Stock Options, Vested and expected to vest	8,993,000
Stock Options, Exercisable	5,432,755
Weighted-Average Exercise Price, Options Outstanding, Beginning Balance	$ 7.19
Weighted-Average Exercise Price, Option grants	48.47
Weighted-Average Exercise Price, Options exercised	4.22
Weighted-Average Exercise Price, Options forfeited	9.19
Weighted-Average Exercise Price, Options Outstanding, Ending Balance	9.97	$ 7.19
Weighted-Average Exercise Price, Vested and expected to vest	9.97
Weighted-Average Exercise Price, Exercisable	$ 5.75
Weighted-Average Remaining Contractual Life (in Years), Options Outstanding	7 years 3 months 18 days	7 years 3 months 18 days
Weighted-Average Remaining Contractual Life (in Years), Vested and expected to vest	7 years 3 months 18 days
Weighted-Average Remaining Contractual Life (in Years), Exercisable	6 years 8 months 19 days
Aggregate Intrinsic Value, Options Outstanding	$ 328,495	$ 288,713
Aggregate Intrinsic Value, Vested and expected to vest	328,495
Aggregate Intrinsic Value, Exercisable	$ 220,679

Common Stock and Stockholders47

Common Stock and Stockholders' Equity - Summary of Activity Related to RSUs (Details) - 2016 Equity Incentive Plan - Restricted Stock Units (RSUs)	3 Months Ended
	Apr. 30, 2018$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs Outstanding, Awarded and unvested, Beginning balance | shares	1,971,778
Number of RSUs Outstanding, Awards granted | shares	1,420,032
Number of RSUs Outstanding, Awards vested | shares	(115,833)
Number of RSUs Outstanding, Awards forfeited | shares	(97,404)
Number of RSUs Outstanding, Awarded and unvested, Ending balance | shares	3,178,573
Weighted-Average Grant Date Fair Value, Awarded and unvested, Beginning balance | $ / shares	$ 27.14
Weighted-Average Grant Date Fair Value, Awards granted | $ / shares	48.03
Weighted-Average Grant Date Fair Value, Awards vested | $ / shares	24.46
Weighted-Average Grant Date Fair Value, Awards forfeited | $ / shares	30.52
Weighted-Average Grant Date Fair Value, Awarded and unvested, Ending balance | $ / shares	$ 36.47

Common Stock and Stockholders48

Common Stock and Stockholders' Equity - Total Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 11,312	$ 5,277
Subscription services
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	831	355
Professional services and other
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	946	563
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,547	1,152
Sales and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	2,970	1,600
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 4,018	$ 1,607

Common Stock and Stockholders49

Common Stock and Stockholders' Equity - Assumptions used to Estimate Fair Values of Stock Options Granted (Details)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 years 7 days	6 years
Volatility	42.20%	46.00%
Risk-free interest rate	2.80%
Risk-free interest rate, minimum		2.00%
Risk-free interest rate, maximum		2.20%
Market-based Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	7 years 25 days
Volatility	43.70%
Risk-free interest rate	2.80%
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility, minimum	31.10%	39.30%
Volatility, maximum	34.10%	42.60%
Risk-free interest rate, minimum	2.00%	0.90%
Risk-free interest rate, maximum	2.30%	1.40%
Employee Stock Purchase Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 months	6 months
Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	2 years	2 years

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2018USD ($)d$ / shares	Apr. 30, 2018USD ($)$ / shares	Jan. 31, 2018USD ($)$ / shares	Jan. 17, 2018USD ($)
Debt Instrument [Line Items]
Multiples of principal amount	$ 1,000,000,000		$ 1,000,000,000
0.375% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Debt instrument, Principal amount	230,000,000	$ 230,000,000	$ 230,000,000
Debt instrument, Issued amount				$ 230,000,000
Net proceeds from issuance of convertible notes	$ 200,400,000
Debt instrument, Interest payment terms		interest is payable semi-annually in cash at a rate of 0.375% per annum on January 15 and July 15 of each year, beginning on July 15, 2018.
Debt instrument, Frequency of periodic payment		semi-annually
Debt Instrument, Date of first required payment	Jul. 15, 2018
Debt instrument, Maturity date	Jan. 15, 2023
Debt Instrument, Convertible terms		Prior to the close of business on the business day immediately preceding October 15, 2022, the Convertible Notes are convertible at the option of holders during certain periods, upon satisfaction of certain conditions. On or after October 15, 2022, the Convertible Notes are convertible at any time until the close of business on the second scheduled trading day immediately preceding the maturity date.
Debt instrument, Initial conversion rate of shares of common stock per $1,000 principal	22.4685
Debt instrument, Initial conversion price per share | $ / shares	$ 44.5068		$ 44.5068
Debt instrument, fundamental change, repurchase price, equals to principal amount of convertible notes	100.00%		100.00%
Debt discount	$ 62,300,000		$ 62,300,000
Transaction costs related to convertible notes	7,000,000		$ 7,000,000
Debt discount on convertible notes of remaining amortization period		4 years 8 months 12 days	5 years
0.375% Convertible Senior Notes Due 2023 | Capped Call Options
Debt Instrument [Line Items]
Purchase price of capped call options		$ 23,300,000
Capped call exercise price | $ / shares		63.821
0.375% Convertible Senior Notes Due 2023 | Minimum
Debt Instrument [Line Items]
Debt instrument, Principal amount	$ 0	$ 9,600,000	$ 0
Percentage of principal amount shall be declare as due and payable upon certain events of default	25.00%		25.00%
0.375% Convertible Senior Notes Due 2023 | Conversion Notes Holders Conversion Rights, Circumstances 1
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading/business days | d	20
Debt instrument, convertible, threshold consecutive trading days | d	30
Debt instrument, convertible, threshold percentage of sales price of common stock	130.00%
0.375% Convertible Senior Notes Due 2023 | Conversion Notes Holders Conversion Rights, Circumstances 2
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading/business days | d	5
Debt instrument, convertible, threshold consecutive trading days | d	5
Debt instrument, convertible, threshold percentage of sales price of common stock	98.00%
0.375% Convertible Senior Notes Due 2023 | Private Placement
Debt Instrument [Line Items]
Debt instrument, Principal amount	$ 230,000,000		$ 230,000,000
Debt instrument, Interest rate	0.375%		0.375%
0.375% Convertible Senior Notes Due 2023 | Initial Placement
Debt Instrument [Line Items]
Debt instrument, Principal amount	$ 200,000,000		$ 200,000,000
0.375% Convertible Senior Notes Due 2023 | Overallotment Option
Debt Instrument [Line Items]
Debt instrument, Principal amount	$ 30,000,000		$ 30,000,000

Convertible Senior Notes - Sche

Convertible Senior Notes - Schedule of Components of Convertible Senior Notes (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Liability:
Net carrying amount	$ 165,758	$ 163,010
0.375% Convertible Senior Notes Due 2023
Liability:
Principal	230,000	230,000
Less: debt discount, net of amortization	(64,242)	(66,990)
Net carrying amount	165,758	163,010
Equity	$ 60,470	$ 60,470

Convertible Senior Notes - Summ

Convertible Senior Notes - Summary of Interest Expense Recognized Related to Convertible Notes (Details) - 0.375% Convertible Senior Notes Due 2023 $ in Thousands	3 Months Ended
	Apr. 30, 2018USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 249
Amortization of debt issuance costs	207
Amortization of debt discount	2,541
Total	$ 2,997
Effective interest rate of the liability component	7.66%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Non-cancelable operating leases expiration dates	through April 2024
Rent expense	$ 1.8	$ 1

Commitments and Contingencies54

Commitments and Contingencies - Future Minimum Payments for Non-cancellable Leases and Purchase Obligations (Details) $ in Thousands	Apr. 30, 2018USD ($)
Commitments And Contingencies Disclosure [Abstract]
2019 (remaining nine months)	$ 8,904
2,020	6,344
2,021	6,300
2,022	6,219
2,023	5,670
Thereafter	6,084
Total	$ 39,521

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 490,000	$ 84,000
Effective tax rate	(3.27%)	(1.84%)
U.S. federal statutory tax rate	21.00%		35.00%
Income tax examination, description	As a result of net operating loss carryforwards, the Company is subject to audits for tax years 2006 and forward for federal purposes and 2009 and forward for California purposes.

Net Loss per Share Attributab56

Net Loss per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Numerator:
Net loss attributable to common stockholders	$ (15,454)	$ (10,038)
Denominator:
Weighted-average common shares outstanding	55,873	50,577
Net loss per share attributable to common stockholders, basic and diluted	$ (0.28)	$ (0.20)

Net Loss per Share Attributab57

Net Loss per Share Attributable to Common Stockholders - Potentially Dilutive Securities Not Included in Diluted per Share Calculations (Details) - shares	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	12,657,014	13,746,315
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	8,993,000	11,796,698
RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	3,178,573	1,589,620
Unvested common shares subject to repurchase
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	410,839	293,731
Shares committed under the ESPP
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	74,602	66,266

Net Loss per Share Attributab58

Net Loss per Share Attributable to Common Stockholders - Additional Information (Details) shares in Millions	3 Months Ended
	Apr. 30, 2018$ / sharesshares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Additionally shares underlying conversion option | shares	5.2
Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Convertible, conversion price per share | $ / shares	$ 44.51

Significant Customers and Geo59

Significant Customers and Geographic Information - Additional Information (Details) - Customer	Apr. 30, 2018	Jan. 31, 2018	Jan. 31, 2017
Accounts Receivable | Customer
Concentration Risk [Line Items]
Number of customers comprising 10% or more of total accounts receivable	0	0
Revenue | Customer
Concentration Risk [Line Items]
Number of customers comprising more than 10% of revenues	0		0
Revenue | Geographic Concentration Risk | Foreign Countries
Concentration Risk [Line Items]
Number of customers comprising more than 10% of revenues	0		0

Significant Customers and Geo60

Significant Customers and Geographic Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	$ 56,352	$ 41,137
United States
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	34,475	27,311
Foreign Countries
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	$ 21,877	$ 13,826

Related Parties - Additional In

Related Parties - Additional Information (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Related Party Transaction [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 56,352,000	$ 41,137,000
Outstanding receivables	47,052,000		$ 61,366,000
Subscription
Related Party Transaction [Line Items]
Revenue from contract with customer, excluding assessed tax	49,966,000	35,664,000
T. Rowe Associates, Inc.
Related Party Transaction [Line Items]
Outstanding receivables	0		$ 0
T. Rowe Associates, Inc. | Subscription
Related Party Transaction [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 153,000	$ 130,000