Tintri (TNTRQ) 10-Q 14 Sep 17 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jul. 31, 2017	Sep. 05, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 31, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	TNTR
Entity Registrant Name	Tintri, Inc.
Entity Central Index Key	1,554,875
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		31,324,097

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 72,691	$ 48,048
Short-term investments	7,926	0
Accounts receivable, net	18,946	30,749
Inventories, net	6,180	6,509
Prepaid and other current assets	4,958	6,202
Total current assets	110,701	91,508
Property and equipment, net	10,000	10,410
Other long-term assets	3,000	2,984
Total assets	123,701	104,902
Current liabilities:
Accounts payable	18,057	15,674
Accrued and other current liabilities	19,725	20,668
Deferred revenue, current	30,172	28,056
Long-term debt, current portion	18,962	0
Total current liabilities	86,916	64,398
Deferred revenue, non-current	30,463	28,389
Long-term debt	49,540	48,914
Other long-term liabilities	5,256	5,041
Total liabilities	172,175	146,742
Commitments and contingencies (Note 6)
Convertible preferred stock		257,141
Stockholders’ deficit:
Common stock	2	1
Additional paid-in capital	355,132	41,745
Notes receivables from stockholders	(744)	(1,544)
Accumulated other comprehensive loss	(337)	(466)
Accumulated deficit	(401,316)	(338,717)
Treasury stock	(1,211)
Total stockholders’ deficit	(48,474)	(298,981)
Total liabilities, convertible preferred stock and stockholders’ deficit	$ 123,701	$ 104,902

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenue:
Product	$ 26,329	$ 20,768	$ 48,716	$ 37,445
Support and maintenance	8,537	6,788	16,505	12,987
Total revenue	34,866	27,556	65,221	50,432
Cost of revenue:
Product	11,470	7,160	20,379	13,096
Support and maintenance	3,682	2,568	6,721	4,640
Total cost of revenue	15,152	9,728	27,100	17,736
Gross Profit:
Product	14,859	13,608	28,337	24,349
Support and maintenance	4,855	4,220	9,784	8,347
Total gross profit	19,714	17,828	38,121	32,696
Operating expenses:
Research and development	23,080	12,989	38,003	26,648
Sales and marketing	32,607	24,466	60,049	49,462
General and administrative	13,171	4,911	18,503	10,586
Total operating expenses	68,858	42,366	116,555	86,696
Loss from operations	(49,144)	(24,538)	(78,434)	(54,000)
Other expense, net:
Interest expense	(2,798)	(1,376)	(4,072)	(2,813)
Other income, net	413	395	455	681
Total other expense, net	(2,385)	(981)	(3,617)	(2,132)
Loss before provision for income taxes	(51,529)	(25,519)	(82,051)	(56,132)
Provision for income taxes	138	153	296	351
Net loss	(51,667)	(25,672)	(82,347)	(56,483)
Deemed dividend to Series E and E-1 Convertible Preferred Stock	0	0	(6,588)	0
Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock	26,336	0	26,336	0
Net loss attributable to common stockholders	$ (25,331)	$ (25,672)	$ (62,599)	$ (56,483)
Net loss per share attributable to common stockholders— basic and diluted	$ (2.05)	$ (7.53)	$ (7.78)	$ (16.63)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted	12,343,830	3,409,123	8,045,418	3,397,369

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (51,667)	$ (25,672)	$ (82,347)	$ (56,483)
Other comprehensive income (loss), net of taxes:
Unrealized gains on available-for-sale investments				12
Foreign currency translation adjustments	(14)	(177)	129	(104)
Comprehensive loss, net of taxes	$ (51,681)	$ (25,849)	$ (82,218)	$ (56,575)

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Cash flows from operating activities:
Net loss	$ (82,347)	$ (56,483)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,605	4,799
Stock-based compensation expense	25,918	7,441
Accretion of balloon payment	750	402
Amortization of debt issuance cost, credit facility fees and debt discounts	105	221
Other	(13)	(18)
Changes in operating assets and liabilities:
Accounts receivable	11,803	5,662
Inventories	329	(1,009)
Prepaid expenses and other assets	(887)	(2,976)
Payment of offering costs	(1,518)	(1,900)
Accounts payable	(1,583)	2,569
Deferred revenue	4,190	3,540
Accrued and other liabilities	(1,807)	(1,760)
Net cash used in operating activities	(41,455)	(39,512)
Cash flows from investing activities:
Purchase of property and equipment	(2,054)	(2,331)
Purchase of investments	(7,926)	(8,423)
Proceeds from maturities of investments	0	40,810
Net cash provided by (used in) investing activities	(9,980)	30,056
Cash flows from financing activities:
Payment on capital lease financing	(172)	(112)
Proceeds from revolving line of credit	5,000	6,962
Proceeds from term loan	15,000	0
Proceeds from initial public offering, net of underwriting discounts and commissions	55,804	0
Proceeds from repayment of employee notes receivable	0	67
Proceeds from exercise of stock options	470	696
Net cash provided by financing activities	76,102	7,613
Foreign exchange impact on cash and cash equivalents	(24)	(62)
Net increase (decrease) in cash and cash equivalents	24,643	(1,905)
Cash and cash equivalents, beginning of period	48,048	50,716
Cash and cash equivalents, end of period	72,691	48,811
Supplemental disclosures of cash flow information:
Cash paid for income taxes	63	513
Cash paid for interest	3,276	1,906
Supplemental disclosures of noncash investing and financing activities:
Convertible preferred stock warrants issued in connection with debt financing	277	0
Common stock warrants issued to Series E-2 and F-2 Holders	14,641	0
Reclassification of convertible preferred stock warrant liability to additional paid in capital	375	0
Conversion of convertible preferred stock to common stock, net of issuance costs	263,729	0
Offering costs included in accounts payable	2,850	632
Vesting of early exercised options	345	33
Assets acquired through accounts payable	776	563
Vesting of stock options exercised with notes receivable	231	279
Transfer of inventory to sales demonstration equipment	373	174
Transfer of inventory to internal use equipment	105	155
Deemed dividend to series E and E-1 Convertible Preferred Stock	6,588	0
Deemed capital contribution from Series E, E-1 and F Convertible Preferred Stock	26,336	0
Repurchase of common stock by way of note forgiveness	1,211	0
Repayment of executive employee promissory notes through repurchase of common stock	$ 7,899	$ 0

Business Overview

Business Overview	6 Months Ended
	Jul. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business Overview	(1) Business Overview Description of Business Tintri, Inc. (Tintri or the Company) was incorporated in the state of Delaware in 2008 and is headquartered in Mountain View, California. The Company develops and markets an enterprise cloud platform combining cloud management software technology and a range of all-flash storage systems, for virtualized and cloud environments. Initial Public Offering In July 2017, the Company completed its initial public offering (“IPO”), in which it sold 8,572,000 shares of common stock. The shares were sold at an IPO price of $7.00 per share for net proceeds of $55.8 million, after deducting underwriting discounts and commissions of $4.2 million. Immediately prior to the closing of the Company’s IPO, all shares of the Company’s then-outstanding convertible preferred stock automatically converted into an aggregate 17,992,973 shares of common stock in accordance with the terms of each series of preferred stock. Following the completion of the IPO, the IPO underwriters exercised an over-allotment option to purchase an additional 1,000,000 shares of common stock from the Company in August 2017. The additional shares were sold at the IPO price of $7.00 per share for net proceeds of $6.5 million, after deducting underwriting discounts and commissions of $0.5 million. Unaudited Interim Condensed Consolidated Financial Information The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and applicable rules and regulations of the Securities and Exchange Commission (the SEC) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s prospectus (the Prospectus) filed pursuant to Rule 424(b) under the Securities Exchange Act of 1933, as amended, with the SEC on June 30, 2017. The condensed consolidated balance sheet as of January 31, 2017, included herein was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by U.S. GAAP on an annual reporting basis. 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 and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full fiscal year 2018 or any future period. Liquidity The Company has experienced negative cash flows from operations since its inception and expects negative cash flows from operations to continue for the foreseeable future. Net losses incurred during the past three fiscal years ended January 31, 2015, 2016 and 2017 amounted to $69.7 million, $101.0 million and $105.8 million, respectively, and $82.3 million for the six months ended July 31, 2017. Unless and until the Company is able to generate sufficient revenue from sales of its products and services to generate positive cash flows from operations, it expects such losses to continue. The Company is also subject to certain financial covenants related to its debt facilities that, if breached, could result in the debt becoming immediately due and payable in the event the lenders choose to declare an event of default. The Company may not have sufficient liquidity to repay amounts outstanding under its debt facilities should they become immediately due and payable. Historically, the Company has funded a significant portion of its operations through the issuance of equity and debt. In fiscal 2016, the Company raised $124.6 million in gross proceeds (Note 7) related to the sale of convertible preferred stock. The Company has also entered into credit facilities, under which the Company had borrowed an aggregate of $69.0 million as of July 31, 2017, and a Note Purchase Agreement (Note 5). In July 2017, the Company completed its IPO, in which it raised $55.8 million, after deducting underwriting discounts and commission. In August 2017, the Company sold an additional 1,000,000 shares of its common stock in connection with the IPO underwriters exercising an over-allotment option, pursuant to which the Company received net proceeds of $6.5 million, after deducting underwriting discounts and commissions. The Company expects that this additional financing from its IPO, combined with its plans for continued revenue growth, its existing cash and cash equivalents and short-term investments, and its Note Purchase Agreement and credit facilities will provide sufficient liquidity for the Company to meet its obligations and debt financial covenants through at least September 14, 2018. Until the Company can generate positive cash flows from operations, it expects to continue to finance its operations with additional debt or equity financing and/or work with its lenders to amend certain financial covenants. The Company’s ability to raise additional liquidity is subject to a number of uncertainties, including, but not limited to, the market demand for the Company’s common or preferred stock, the Company’s financial performance and outlook, the market demand for the Company’s products and services, negative economic developments, adverse market conditions, significant delays in launch of new products and lack of market acceptance of new products. If the Company is not able to raise additional capital or access its debt facilities in sufficient amounts to fund its operations, it would have a material adverse effect on the Company’s business, operating results and financial condition.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jul. 31, 2017
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	(2) Basis of Presentation and Summary of Significant Accounting Policies Principles of consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Use of Estimates The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Such estimates include, but are not limited to, the determination of the fair value of deliverables included in multiple element revenue arrangements, valuation of inventories, warranty liability, the useful lives of property and equipment, fair value of the Company’s common stock, value of convertible preferred stock warrant liability, the value of stock options granted, accounting for income taxes, including the valuation reserve on deferred tax assets and accounting for uncertain tax positions, and contingencies. Actual results could differ materially from these estimates. Management evaluates these estimates and assumptions on an ongoing basis using historical experience and other factors and makes adjustments when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could materially differ from those estimates and assumptions. Concentrations The Company’s financial instruments that are exposed to concentrations of credit risk are primarily cash and cash equivalents, investments, and accounts receivable. Cash and cash equivalents, and investments are maintained primarily at one financial institution, and deposits will generally exceed the amount of insurance provided on such deposits. Risks associated with cash and cash equivalents, and investments are mitigated by banking with a creditworthy institution. The Company has not experienced any losses on its deposits of cash and cash equivalents or its investments. The Company sells its products primarily through channel partners and distributors (collectively, Partners), and occasionally directly to customers. The Company’s accounts receivable are unsecured and represent amounts due to the Company based on contractual obligations of the Company’s Partners and direct customers. The Company mitigates credit risk with respect to accounts receivable by performing ongoing credit evaluations of its Partners and direct customers to assess the probability of collection based on a number of factors, including, but not limited to, past transaction experience with its Partners and direct customers, evaluation of their credit history, limiting the credit extended, and review of the invoicing terms of the contract. The Company generally does not require its Partners and direct customers to provide collateral to support accounts receivable. The Company records an allowance for doubtful accounts for those receivables that are determined not to be collectible. For each Partner or direct customer greater than 10%, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows: Revenue for the Three Months Ended July 31, Revenue for the Six Months Ended July 31, Accounts as of January 31, Accounts Receivable as of July 31, 2016 2017 2016 2017 2017 2017 Partner A * 24% * 22% 16% 29% Partner B * 19% * 10% * 12% * Represents less than 10%. The Company outsources substantially all of its manufacturing to one independent contract manufacturer. The inability of the manufacturer or supplier to fulfill the Company’s supply or quality requirements or performance failures of the Company’s products could result in lost sales and damage to the Company’s end-customer relationships, which would adversely impact the Company’s business, financial condition and operating results. Foreign Currency Translation and Transactions The financial position and operating results of the Company’s international subsidiaries in the United Kingdom (U.K.), Japan, Australia, Ireland and Singapore have been measured using their respective local currency as the functional currency. Assets and liabilities are translated into U.S. dollars at the exchange rate in effect on the respective consolidated balance sheet date. Revenue and expenses are translated into U.S. dollars using average exchange rates for the corresponding period. Translation adjustments are recorded within other comprehensive loss as a separate component of stockholders’ deficit. There is no income tax effect of currency translation adjustments related to foreign subsidiaries as the Company has no present intention of remitting the undistributed earnings of its foreign subsidiaries. Gains and losses from the remeasurement of foreign currency-denominated balances into the functional currency are included in Other income, net in the Company’s consolidated statements of operations. Remeasurement gains and losses were immaterial for the three and six months ended July 31, 2016 and 2017. Fair Value of Financial Instruments The carrying value of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, investments, accounts payable and accrued and other current liabilities, approximates fair value due to the short period of time to maturity, receipt or payment. The carrying amount of the Company’s revolving line of credit and term loan approximates its fair value as the stated interest rates approximate market rates currently available to the Company. Cash and Cash Equivalents The Company considers all highly liquid investments, such as money market funds, with original maturities of 90 days or less at date of purchase, to be cash equivalents. Cash and cash equivalents consist principally of checking account deposits and money market funds. Accounts Receivable Accounts receivable are recorded at the invoiced amounts and do not bear interest. The Company maintains an allowance for doubtful accounts for estimated losses inherent in its accounts receivable portfolio and an allowance for returns. An allowance for doubtful accounts is determined based on the aging of the Company’s trade receivables, historical experience, and management judgment. The Company writes off trade receivables against the allowance when management determines a balance is uncollectible and no longer actively pursues collection of the receivable. An allowance for returns is determined based on historical returns and management judgment. As of January 31, 2017 and July 31, 2017, allowance for doubtful accounts was $0.1 million and $0, respectively. Allowance for returns was $0.3 million and $0.4 million as of January 31, 2017 and July 31, 2017, respectively. Inventories Inventories consist primarily of raw materials related to component parts and finished goods. Finished goods include inventory held for sale, service inventory held at third-party service inventory depots in support of customer service agreements, and customer evaluation inventory. The following is a summary of the Company’s inventories by major category (in thousands): As of January 31, As of July 31, 2017 2017 Raw materials $ 264 $ 229 Finished goods 6,245 5,951 $ 6,509 $ 6,180 Inventory values are stated at the lower of cost (on a first-in, first-out method), or market value. A provision is recorded to adjust inventory to its estimated realizable value when inventory is determined to be in excess of anticipated demand or obsolete. Specifically, customer support inventory is written down to its net realizable value based upon the estimated loss of utility starting from the date the customer support inventory is placed in the third-party service inventory depots through the estimated period of service obligation fulfillment; and customer evaluation inventory is periodically reviewed and reserved for excess and obsolescence. The Company recorded inventory writedowns of $0.6 million and $0.9 million for the six months ended July 31, 2016 and 2017, respectively, of which $0 and $0.2 million, respectively, were recorded in cost of product revenue and $0.6 million and $0.7 million, respectively, were recorded in cost of support and maintenance revenue in the consolidated statements of operations. Inventory writedowns for the three months ended July 31, 2016 and 2017 were $0.4 million and $0.5 million, respectively, of which $0 and $0.1 million, respectively, were recorded in cost of product revenue and $0.4 million and $0.4 million, respectively, were recorded in cost of support and maintenance revenue in the consolidated statements of operations. Investments The Company’s primary objectives of its investment activities are to preserve principal, provide liquidity, and maximize income without significantly increasing risk. Some of the securities the Company invests in are subject to interest risk. To minimize this risk, the Company maintains its portfolio of cash, cash equivalents, short-term and long-term investments in a variety of securities, which may include commercial paper, money market funds, U.S. government and agency securities, and corporate debt securities. The Company classifies its investments as available-for-sale at the time of purchase since it is intended that these investments are available for current operations, and include these investments on the accompanying consolidated balance sheets as either short-term or long-term investments depending on their maturity. Investments not considered cash equivalents and with maturities of one year or less from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments. Investments are reported at fair value and are subject to periodic impairment review. Unrealized gains and losses related to changes in the fair value of these securities are recognized in accumulated other comprehensive loss net of tax, unless they are determined to be other-than-temporary impairments. The ultimate value realized on these securities is subject to market price volatility until they are sold. Investments are considered impaired when a decline in fair value is judged to be other-than-temporary. The Company consults with investment managers and considers available quantitative and qualitative evidence in evaluating potential impairment of investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, the Company evaluates, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and the Company’s intent and ability to hold the investment to maturity. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established. Property and Equipment, Net Property and equipment, including leasehold improvements, are stated at cost, less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets. Depreciation on property and equipment, excluding leasehold improvements and sales demonstration equipment, ranges from 24 to 60 months. Sales demonstration equipment is depreciated over the estimated useful lives of the respective assets, which range up to 24 months. Leasehold improvements are amortized over the shorter of the estimated useful lives of the respective assets or the remaining property lease terms, which range up to eight years. Upon the retirement or disposition of property and equipment, the related costs and accumulated depreciation are removed and any related gain or loss is recorded in the consolidated statements of operations as an operating expense. Impairment of Long-Lived Assets The Company evaluates events and changes in circumstances that could indicate carrying amounts of long-lived assets, consisting of property and equipment, may not be recoverable. When such events or changes in circumstances occur, the Company assesses the recoverability of long-lived assets by determining whether or not the carrying value of such assets will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of an asset, the Company records an impairment charge for the amount by which the carrying amount of the asset exceeds the fair value of the asset. When the Company determines that the useful lives of assets are shorter than was originally estimated, the Company accelerates the rate of depreciation over the assets’ new, shorter useful lives. Through July 31, 2017, the Company did not write down any of its long-lived assets as a result of impairment. Warranties The Company provides a one-year warranty for hardware components covering material defects in materials and workmanship. In addition, the Company provides a 90-day warranty on the software in its products for nonconformance with documented specifications. With respect to the hardware warranty obligation, the Company’s contract manufacturer is generally required to repair or replace defective hardware resulting from defective workmanship within one year of shipment. Furthermore, the Company’s support contracts provide for the same parts replacement that end-users are entitled to under the warranty program, except that replacement parts are delivered according to targeted response times to minimize disruption to the end-users’ critical business applications. Substantially all end-users purchase support contracts. Given that substantially all products are sold together with support contracts, the Company has limited exposure related to warranty costs and therefore no warranty reserve has been recorded. Revenue Recognition The Company generates revenue from sales of enterprise cloud platform solutions and related support and maintenance. The Company derives revenue primarily from two sources: (i) Product revenue, which includes hardware and perpetual software license revenue and (ii) Support and maintenance revenue, which includes support, installation services and training. Revenue is recognized when all of the following criteria are met: persuasive evidence of an arrangement exists; the product or service has been delivered; the sales price is fixed or determinable; and collection is reasonably assured. The Company defines each of the four criteria above as follows: • Persuasive Evidence of an Arrangement Exists. The Company uses stand-alone purchase orders, signed sales quotations or purchase orders pursuant to the terms and conditions of a master sales agreement to support the evidence of an arrangement with Partners and direct customers. • Delivery has Occurred. The Company uses shipping documentation to verify delivery of products. Provided that all other revenue recognition criteria have been met, the Company typically recognizes product revenue upon shipment, as title and risk of loss are transferred at that time. Products are typically shipped directly by the Company to Partners and direct customers. Support and maintenance revenue is recognized over time as the services are delivered. The Company generally does not have significant obligations for future performance, such as rights of return or pricing credits, associated with the sales of its products. It is the Company’s practice to identify an end user prior to shipment to a Partner. • The Sales Price is Fixed or Determinable. The Company assesses whether the fee is fixed or determinable based on the payment terms associated with the transaction. If the terms are extended beyond the Company’s normal payment terms, the Company will recognize revenue as the payments become due. Payments from Partners are not contingent on the Partners’ receiving payment from the end-users. • Collection is Reasonably Assured. The Company assesses probability of collection on an individual basis. The Company’s Partners or customers are subjected to a credit review process that evaluates their financial condition and ability to pay. Support and maintenance revenue includes arrangements for software and technical support for the Company’s products. While purchasing support and maintenance is not mandatory, substantially all products shipped have been purchased together with a support contract. Support is offered under renewable, fee-based contracts and includes technical support, hardware repair and replacement parts, and software patches, bug fixes, updates, and upgrades. Support and maintenance revenue is initially deferred and recognized ratably over the life of the contract, with the related expenses, including the write down of customer support inventory to its net realizable value, recognized as incurred. Support and maintenance contracts range from one to five years. Unearned support revenue is included in deferred revenue. Professional service revenue primarily consists of fees the Company earns related to installation. While installation services are not contractually mandatory, customers occasionally purchase such services. The Company generally recognizes revenue from installation services upon delivery or completion of performance. Installation services are typically short term in nature. To date, revenue arising from installation service has been insignificant. The Company reports revenue net of sales taxes. Shipping charges billed to customers are included in product revenue and the related shipping and handling costs are included in cost of product revenue. Multiple Element Arrangements The Company’s offering consists of hardware products containing software components that function together to provide the essential functionality of the product. Therefore, the Company’s hardware products (inclusive of the core software) are considered non-software deliverables and are not subject to industry-specific software revenue recognition guidance. The Company’s product revenue also includes revenue from the sale of stand-alone software products. Stand-alone software may operate on the Company’s hardware product, but is not considered essential to the functionality of the hardware and is subject to the industry-specific software revenue recognition guidance. The Company’s typical multiple element arrangement includes hardware product (including the essential software) and support. The Company may also sell stand-alone software as part of its multiple element arrangements. The Company considers each of these deliverables to be separate units of accounting based on whether the delivered items have stand-alone value. The Company has determined that each unit of accounting has stand-alone value because they are sold separately by the Company or, for hardware products, because the customers can resell them to others on a stand-alone basis. For certain arrangements with multiple deliverables, the Company allocates the arrangement fee to the non-software element based upon the relative selling price of such element and, if software and software-related elements such as support for the software element are also included in the arrangement, the Company allocates the arrangement fee to those software and software-related elements as a group. After such allocations are made, the amount of the arrangement fee allocated to the software and software-related elements is accounted for using the residual method. When applying the relative selling price method, the Company determines the selling price for each element using vendor-specific objective evidence (VSOE) of selling price, if it exists, or if not, third-party evidence (TPE) of selling price, if it exists. If neither VSOE nor TPE of selling price exist for an element, the Company uses its best estimated selling price (BESP) for that element. The revenue allocated to each element is then recognized when the basic revenue recognition criteria are met for that element. When an arrangement includes stand-alone software products and related support, consideration is allocated to the software deliverable as described above. The Company uses the residual method to recognize revenue related to this consideration when a product agreement includes one or more elements to be delivered at a future date and VSOE of the fair value of all undelivered elements exists. In the majority of the Company’s contracts, the only element that remains undelivered at the time of delivery of the product is support services. Under the residual method, the VSOE of fair value of the undelivered elements is deferred and the remaining portion of the contract fee is recognized upfront as product revenue. If evidence of the VSOE of fair value of the undelivered elements does not exist, all revenue is deferred and recognized at the earlier of (i) when delivery of those elements occurs or (ii) when fair value can be established unless support services is the only undelivered element, in which case, the entire arrangement fee is recognized ratably over the contractual period of the support services. VSOE of fair value for elements of an arrangement is based upon the normal pricing and discounting practices for those deliverables when sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices for a deliverable fall within a reasonably narrow pricing range, evidenced by a substantial majority of such historical stand-alone transactions falling within a reasonably narrow range. The Company is not able to determine TPE for its products or services. TPE is determined based on competitor prices for similar deliverables when sold separately. Generally, the Company’s go-to-market strategy differs from that of its peers and its offerings contain a significant level of differentiation such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, the Company is unable to reliably determine what similar competitor products’ selling prices are on a stand-alone basis. When the Company is unable to establish the selling price of its deliverables using VSOE or TPE, the Company uses BESP in its allocation of arrangement consideration. The objective of BESP is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. The Company determines BESP for the purposes of allocating the arrangement by reviewing market factors including, but not limited to, pricing practices including discounting, the geographies in which the Company offers its products and services, and the type of customer (i.e., Partners or direct customers). Additionally, the Company considers historical transactions, including transactions whereby the deliverable was sold on a stand-alone basis. Deferred revenue consists of billings or payments received in advance of revenue recognition and primarily relates to support and maintenance. Deferred revenue that will be recognized during the twelve-month period following the balance sheet date is recorded as Deferred revenue, current and the remaining portion is recorded as Deferred revenue, non-current. Research and Development Research and development expense consists of personnel costs, including stock-based compensation expense, for the Company’s research and development personnel and product development costs, including engineering services, development software and hardware tools, depreciation of capital equipment, facility costs, and information technology spend. Research and development costs are expensed as incurred. All costs incurred in the research and development of the Company’s software products are expensed as incurred until technological feasibility has been established. As of January 31, 2017 and July 31, 2017, there were no capitalized computer software development costs as the time between technological feasibility and general release is short. Advertising Costs Advertising costs are expensed as incurred and are included in sales and marketing expense. Advertising costs for the six months ended July 31, 2016 and 2017 were $0.4 million and $1.9 million, respectively. Advertising costs for the three months ended July 31, 2016 and 2017 were $0.2 million and $0.9 million, respectively. Commission Costs Commission costs are expensed as incurred and are included in sales and marketing expense. Stock-Based Compensation Stock Options The Company measures and recognizes compensation expense for all stock-based awards made to employees based on estimated fair values on the date of grant. Stock-based awards consist of stock options. The Company uses the Black-Scholes option pricing model to estimate the value of stock-based compensation expense for all stock options. The related stock-based compensation expense is recognized on a straight-line basis, over the period in which an employee is required to provide service in exchange for the stock-based award, which is generally four years. Restricted Stock Units Stock-based compensation expense is measured and recognized in the financial statements based on the fair value of the Company’s common stock on the date of grant. Stock-based compensation expense is recognized over the requisite service period, and upon performance conditions being met. Income Taxes The Company recognizes income taxes under the asset-and-liability method. The Company recognizes deferred income tax assets and liabilities for the expected future consequences of temporary differences between the financial reporting and tax bases of assets and liabilities. These differences are measured using the enacted statutory tax rates that are expected to apply to taxable income for the years in which differences are expected to reverse. The Company recognizes the effect on deferred income taxes of a change in tax rates in income in the period that includes the enactment date. The Company records a valuation allowance to reduce its deferred tax assets to the net amount that the Company believes is more likely than not to be realized. The Company considers all available evidence, both positive and negative, including historical levels of income, expectations and risks associated with estimates of future taxable income, and ongoing tax planning strategies in assessing the need for a valuation allowance. Realization of deferred tax assets is dependent upon the generation of future taxable income, if any, the timing and amount of which are uncertain. Due to the history of losses the Company has generated in the past, the Company believes that it is not more likely than not that the deferred tax assets will be realized as of July 31, 2017. Accordingly, the Company has recorded a full valuation allowance on its net deferred tax assets. The Company recognizes tax benefits from uncertain tax positions only if they believe that it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. The Company makes adjustments to these reserves when facts and circumstances change, such as the closing of a tax audit or the refinement of an estimate. The provision for income taxes includes the effects of any reserves that are considered appropriate, as well as the related net interest and penalties. The Company expects to permanently reinvest undistributed earnings in foreign subsidiaries outside of the United States to fund future foreign operations. The Company projects that it will have sufficient cash flow in the United States and will not need to repatriate the foreign earnings to finance our domestic operations. If the Company were to distribute these earnings to the United States, it would be subject to U.S. income taxes, less any allowable foreign tax credits, and foreign withholding taxes. The Company has not recorded a deferred tax liability on any portion of our undistributed earnings in foreign subsidiaries. If the Company were to repatriate these earnings to the United States, any associated income tax liability would be insignificant. Recently Issued and Not Yet Adopted Accounting Pronouncements In August 2016, the Financial Accounting Standard Board (FASB) issued Accounting Standards Update (ASU) No. 2016-15, Classification of Certain Cash Receipts and Cash Payments In February 2016, FASB issued ASU No. 2016-02, Leases. In May 2014, FASB issued ASU, 2014-09, Revenue from Contracts with Customers The Company has engaged third party service providers to assist in its evaluation and system implementation. Furthermore, the Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new standard. While the Company continues to assess the potential impact of the new standard, including the areas described above, it has not yet quantified the impact the new standard may have on its consolidated financial statements.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jul. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	(3) Fair Value Measurements We categorize assets and liabilities recorded at fair value on our consolidated balance sheets based on the accounting guidance framework for measuring fair value on either a recurring or nonrecurring basis, whereby inputs used in valuation techniques are assigned a hierarchical level. Fair value is defined as 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. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. GAAP describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, to measure the fair value: • Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs are quoted prices for similar assets and liabilities in active markets; or quoted prices for identical assets or liabilities in less active markets; or benchmark yields, reported trades, broker/dealer quotes or inputs other than quoted prices that are observable for the assets or liabilities, either directly or indirectly through market corroboration, for substantially the full term of the financial instruments. The valuation techniques leverage an independent professional pricing service that uses calculated prices whereby securities with short maturities and infrequent secondary market trades are typically priced via mathematical calculations, cross-market approach, and model valuation methods, which are corroborated by market data. • Level 3—Inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation. Fair value estimates are made at a specific point in time based on relevant market information and information about the financial or nonfinancial asset or liability. These estimates are subjective in nature and involve uncertainties or significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates. The following table presents the fair value of the Company’s financial assets and liabilities using the above input categories as of January 31, 2017 and July 31, 2017 (in thousands): As of January 31, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 31,468 $ — $ — $ 31,468 Total cash equivalents 31,468 — — 31,468 Total assets measured at fair value $ 31,468 — — $ 31,468 Convertible preferred warrants: Series E Convertible Preferred Stock warrants (1) $ — $ — $ 568 $ 568 Total convertible preferred stock warrants — — 568 568 Total liabilities measured at fair value $ — $ — $ 568 $ 568 As of July 31, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 36,678 $ — $ — $ 36,678 Corporate debt securities — 11,954 — 11,954 Total cash equivalents 36,678 11,954 — 48,632 Short-term investments: Corporate debt securities — 5,931 — 5,931 U.S. government and agency securities — 1,995 — 1,995 Total short-term investments — 7,926 — 7,926 Total assets measured at fair value $ 36,678 $ 19,880 $ — $ 56,558 (1) Series E Convertible Preferred Stock Convertible Preferred Stock warrant liability is included in Other long-term liabilities in the accompanying consolidated balance sheet. Immediately prior to the closing of the IPO, all convertible preferred stock warrants automatically converted into common stock warrants. A summary of the changes in the fair value of the Company’s convertible preferred stock warrant liability is as follows (in thousands): January 31, July 31, 2017 2017 Convertible preferred stock warrant liability—beginning balance $ 532 $ 568 Change in fair value* 36 (470 ) Issuance of convertible preferred stock warrants — 277 Reclassification of convertible preferred stock warrant liability to additional paid in capital — (375 ) Convertible preferred stock warrant liability—ending balance $ 568 $ — * Recorded in the consolidated statements of operations within Other income, net. The Company did not have any material financial assets or liabilities for which fair value is determined using Level 3 inputs other than convertible preferred stock warrants and common stock warrants, which are discussed further in Note 7 Convertible Preferred Stock Common Stock,

Balance Sheet Components

Balance Sheet Components	6 Months Ended
	Jul. 31, 2017
Balance Sheet Components Disclosure [Abstract]
Balance Sheet Components	(4) Balance Sheet Components Short Term Investments The Company did not have any investments as of January 31, 2017. Unrealized gains or losses from the Company’s short-term investments were immaterial as of July 31, 2017. There was no other-than-temporary impairment for these investments as of July 31, 2017. The following table summarizes the fair value of the Company’s available for sale investments as of July 31, 2017 (in thousands): As of July 31, 2017 Carrying Amount Fair Value Due within one year $ 7,926 $ 7,926 Total $ 7,926 $ 7,926 Property and Equipment, net Property and equipment, net consist of the following (in thousands): As of January 31, As of July 31, 2017 2017 Computer equipment $ 17,431 $ 19,508 Leasehold improvements 5,941 5,944 Sales demonstration equipment 5,903 6,098 Beta equipment 1,060 1,516 Furniture and fixtures 1,550 1,657 Software 649 660 Construction in progress 39 77 Total property and equipment 32,573 35,460 Less accumulated depreciation and amortization (22,163 ) (25,460 ) Total property and equipment, net $ 10,410 $ 10,000 Depreciation and amortization expense related to property and equipment for the six months ended July 31, 2016 and 2017 was $4.8 million and $3.6 million, respectively. Depreciation and amortization expense related to property and equipment for the three months ended July 31, 2016 and 2017 was $2.5 million and $1.7 million, respectively. At the beginning of the year ended January 31, 2016, the Company substantially ceased its customer evaluation inventory program and initiated its sales demonstration equipment program. As a result, evaluation units in the Company’s sales demonstration equipment program are subject to depreciation over their useful life on a straight line basis. For the six months ended July 31, 2016 and 2017, depreciation expense for sales demonstration equipment was $1.7 million and $0.7 million, respectively, and is included in sales and marketing expense in the consolidated statements of operations. For the three months ended July 31, 2016 and 2017, depreciation expense for sales demonstration equipment was $0.9 million and $0.3 million, respectively, and is included in sales and marketing expense in the consolidated financial statements. Accrued and Other Current Liabilities Accrued and other current liabilities consist of the following (in thousands): As As of July 31, 2017 2017 Accrued sales and use taxes payable $ 1,697 $ 1,830 Accrued sales commissions 4,706 2,325 Accrued bonus 2,427 2,416 Accrued vacation 3,561 4,018 Other accruals 8,277 9,136 Total accrued and other current liabilities $ 20,668 $ 19,725

Debt Obligations

Debt Obligations	6 Months Ended
	Jul. 31, 2017
Debt Disclosure [Abstract]
Debt Obligations	(5) Debt Obligations Debt obligations, net of debt discount and deferred financing costs, consist of the following (in thousands): As of January 31, As of July 31, 2017 2017 Revolving line of credit $ 13,962 $ 18,962 Term loan 34,952 49,540 Total debt 48,914 68,502 Less current portion of debt — (18,962 ) Total long-term portion of debt $ 48,914 $ 49,540 As of July 31, 2017, the Company has a credit facility with TriplePoint that provides up to $60.0 million of available funds. This credit facility is secured by a security interest, junior to the SVB facility described below, on substantially all of the Company’s assets, including its intellectual property, and contains certain customary non-financial restrictive covenants. As of July 31, 2017, $50.0 million was outstanding under this facility. Of such amount, $15.0 million bears interest at 9.0% per year and becomes due in February 2019. The other $35.0 million bears interest at 11.25% per year and becomes due in February 2019. I f the Company on or before February 2019 prepays a minimum of $20.0 million of the total $50.0 million of principal outstanding under this facility and pays an amortization fee to TriplePoint and complies with certain other conditions, the maturity of the remaining $30.0 million outstanding principal balance will be extended to August 2020, subject to the Company making equal monthly amortizing payments of principal and interest through the extended maturity date, calculated at an interest rate equal to 1.50% higher than the rate that previously applied The Company also has a revolving line of credit with SVB, from which an amount based on a percentage of qualifying accounts receivable is available for the Company to borrow, up to a total of $20.0 million. This facility is secured by a security interest, senior to the TriplePoint facility described above, on substantially all of the Company’s assets, including its intellectual property, and is subject to certain financial covenants. This facility is scheduled to expire in May 2018. As of July 31, 2017, $19.0 million was outstanding under this facility, which bears weighted average interest of 4.84% per year. As of January 31, 2017 and July 31, 2017, the Company was in compliance with all of the covenants contained in its credit facility with SVB. Amortization of credit facility fees and debt issuance cost to interest expense under the line of credit and the credit facility was $0.2 million and $ 0.1 0.1 0.1 2.1 In May 2017, the Company entered into a Note Purchase Agreement with certain of its stockholders pursuant to which such stockholders have agreed to purchase from the Company, and the Company has agreed to sell to such stockholders, one or more subordinated convertible promissory notes (Convertible Promissory Notes) having a maximum aggregate principal amount of $25.0 million. Subject to the terms and conditions set forth in the Note Purchase Agreement, the Convertible Promissory Notes may be issued and sold in one or more tranches (each a Tranche) in aggregate amounts to be determined by the Company pursuant to approval of a majority of the members of the Company’s board of directors. Within 30 days of the Company providing a written notice to the relevant stockholders that the Company intends to draw funds under a Tranche, the stockholders shall purchase the required Convertible Promissory Notes. In June 2017, the Company entered into an amendment to the Note Purchase Agreement with certain of its stockholders. Pursuant to the amendment, the obligations of the Company to issue and the stockholders to purchase Convertible Promissory Notes will expire upon the earlier to occur of December 31, 2019 or a change of control of the Company. If and when issued, the Convertible Promissory Notes will have an interest rate of 8% per annum and will mature 18 months from the date of issuance. In addition, at any time on or after December 1, 2019, at the Company’s election, pursuant to the approval of a majority of the members of the Company’s board of directors, the Convertible Promissory Notes will convert into shares of the Company’s common stock at the IPO price of $7.00 per share, provided that any Convertible Promissory Notes issued to entities affiliated with one of the Company’s existing stockholders that is a party to the Note Purchase Agreement will be converted at the average price of the Company’s common stock on the NASDAQ Stock Market over the 30-day period preceding the conversion. As of July 31, 2017, no Notes have been issued and sold under the Note Purchase Agreement. As of January 31, 2017 and July 31, 2017, scheduled principal payments on the outstanding borrowings are as follows (in thousands): As of January 31, 2017: Fiscal 2019 $ 48,962 Total 48,962 Less debt discount (48 ) Less current portion — Non-current portion $ 48,914 As of July 31, 2017: Fiscal 2019 $ 18,962 Fiscal 2020 50,000 Total 68,962 Less debt discount (460 ) Less current portion (18,962 ) Non-current portion $ 49,540

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	(6) Commitments and Contingencies Leases The Company has entered into various noncancelable operating lease agreements and capital lease agreements for its offices and equipment with lease periods expiring between fiscal 2018 and 2023. Certain of these arrangements have escalating rent payment provisions and optional renewal clauses. The Company is also committed to pay a portion of the actual operating expenses under certain of these operating lease agreements. As of January 31, 2017 and July 31, 2017, future minimum lease payments under noncancelable operating leases were as follows (in thousands): As of January 31, 2017: 2018 $ 7,121 2019 7,019 2020 7,127 2021 7,021 2022 7,068 Thereafter 3,984 Committed gross lease payments 39,340 Less proceeds from sublease rental (4,244 ) Net operating lease obligation $ 35,096 As of July 31, 2017: Remaining Fiscal 2018 $ 3,678 2019 7,068 2020 7,135 2021 7,021 2022 7,068 Thereafter 3,984 Committed gross lease payments 35,954 Less proceeds from sublease rental (3,655 ) Net operating lease obligation $ 32,299 The Company recognizes rent expense under its operating leases on a straight-line basis. Rent expense totaled $2.3 million and $3.1 million for the six months ended July 31, 2016 and 2017, respectively and was $1.1 million and $1.6 million for the three months ended July 31, 2016 and 2017, respectively. As of January 31, 2017 and July 31, 2017, future minimum lease payments under noncancelable capital leases were as follows (in thousands): As of January 31, 2017: 2018 $ 216 2019 96 2020 77 Total 389 Interest (20 ) Total $ 369 As of July 31, 2017: Remaining Fiscal 2018 $ 67 2019 96 2020 77 Total 240 Interest (12 ) Total $ 228 Contingencies The Company may, from time to time, become a party to various legal proceedings arising in the ordinary course of business. The Company investigates these claims as they arise. The Company does not believe, based on current knowledge, that any of the current claims will have a material adverse effect on its consolidated financial position, results of operations, or cash flows. Indemnification Some of the Company’s contracts require the Company to indemnify its customers, distributors, or other business partners against certain risks, including in some cases against any third-party claims asserting infringement of certain intellectual property rights. The Company’s exposure under these indemnification provisions is generally limited to the total amount paid by the customer or business partner under the agreement. However, certain agreements include indemnification provisions that could potentially expose the Company to losses in excess of the amount received under the agreement. In addition, the Company has agreed to indemnify its directors, officers, and certain key employees against any liabilities that they may incur while serving in good faith in their respective capacities. To date, there have been no claims under any indemnification provisions. Purchase Commitments During the normal course of business, in order to manage manufacturing lead times and help ensure adequate component supply, the Company provides rolling forecasts to its contract manufacturer of the monthly purchase requirements, a certain amount of which are purchase commitments that the contract manufacturer relies upon to procure components used to build finished products. The Company records a charge to cost of product revenue for firm, non-cancelable and unconditional purchase commitments with its contract manufacturer for non-standard components when and if quantities exceed the Company’s future demand forecasts. As of January 31, 2017, the Company had approximately $13.5 million of purchase commitments with its contract manufacturer. As of July 31, 2017 the Company had approximately $24.4 million of purchase commitments with its contract manufacturer.

Convertible Preferred Stock

Convertible Preferred Stock	6 Months Ended
	Jul. 31, 2017
Equity [Abstract]
Convertible Preferred Stock	(7) Convertible Preferred Stock Prior to the closing of Company’s IPO, the Company’s convertible preferred stock was issuable in series. The number of authorized, issued, and outstanding shares of convertible preferred stock, the issuance date, net proceeds and the aggregate liquidation preferences for the convertible preferred stock as of January 31, 2017 and immediately prior to the automatic conversion of the convertible preferred stock into common stock were as follows (in thousands, except share data): Date issued Number of shares authorized Shares issued and outstanding Liquidation preference A August 2008 1,533,329 1,533,329 $ 4,600 B July 2009 2,119,997 2,119,997 12,000 C May 2011 1,312,311 1,312,311 18,100 D July 2012 1,092,149 1,092,149 25,000 E January 2014 1,681,912 1,641,662 71,377 E-1 January 2014 83,333 83,333 3,623 F July 2015 2,828,185 2,828,185 124,554 Total outstanding as of January 31, 2017 10,651,216 10,610,966 259,254 F February 2017 28,383 — — Total outstanding immediately prior to the closing of the Company’s IPO 10,679,599 10,610,966 $ 259,254 In April 2017, the Company amended its Certificate of Incorporation to modify the automatic conversion terms that would apply to shares of Series E and E-1 Convertible Preferred Stock in the event that the Company completes a Qualified IPO in which the per share public offering price is less than the Series E and E-1 Convertible Preferred Stock purchase price of $43.47828 per share. In lieu of holders of the Series E and E-1 Convertible Preferred Stock having an election to receive cash in such circumstances, under the amended Certificate of Incorporation, the holders of Series E and E-1 Convertible Preferred Stock will have similar rights as the holders of Series F Convertible Preferred Stock if the per share public offering price in a Qualified IPO is less than 1.1x the Series E and E-1 Convertible Preferred purchase price, or $47.826108. As a result of this modification to Series E and E-1 Convertible Preferred Stock, the Company recorded a deemed dividend to Series E and E-1 Convertible Preferred Stock of $6.6 million resulting in a charge to accumulated deficit. In June 2017, the Company amended its Certificate of Incorporation to eliminate certain variable rate adjustments to the conversion ratios of the Series E, E-1 and F Convertible Preferred Stock and replaced them with certain fixed conversion ratios for purposes of the IPO. Pursuant to these fixed conversion ratios, an additional 7,382,007 shares of common stock were issued to holders of Series E, E-1 and F Convertible Preferred Stock, as well as holders of shares of E-2 and F-2 Convertible Preferred Stock that were created in June 2017, who are referred to as the Series E-2 and F-2 Holders, upon the conversion of their shares immediately prior to the closing of the IPO. As an integral part of the foregoing transactions, the Company issued warrants to purchase up to 1,666,665 shares of common stock to the Series E-2 and F-2 Holders. The warrants are exercisable for ten years from the date of grant and have an exercise price of $16.44 per share, which represents 1.2x the fair value of the Company’s common stock as of the date of grant. The issuance of additional shares of common stock upon conversion of the Series E, E-1, E-2, F, and F-2 Convertible Preferred Stock and the issuance of the common stock warrants are considered parts of a single, integrated transaction and was accounted for as an extinguishment of the originally issued Series E, E-1, and F Convertible Preferred Stock. The resulting gain on extinguishment was $26.3 million, which includes an amount of $14.6 million attributable to the warrants, and was recorded as a contribution of capital. Immediately prior to the closing of the Company’s IPO, all shares of the Company’s then-outstanding convertible preferred stock, as shown in the table above, automatically converted into 17,992,973 shares of common stock in accordance with the terms of each series of preferred stock. In addition, immediately prior to the closing of the Company’s IPO, all convertible preferred stock warrants automatically converted into common stock warrants. Accordingly, the Company revalued the convertible preferred stock warrants and reclassified the outstanding preferred stock warrant liability balance to additional paid-in capital with no further remeasurements as the common stock warrants are now deemed permanent equity. As a result of the automatic conversion, 68,633 shares of convertible preferred stock warrants converted into an aggregate 205,897 shares of common stock warrants. Of the 205,897 shares of common stock warrants, 34,058 shares will not be exercisable until such time that additional loan amount of $10.0 million under the New Facility Agreement is drawn.

Common Stock

Common Stock	6 Months Ended
	Jul. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Common Stock	(8) Common Stock Shares Reserved for Future Issuance As of January 31, 2017 and July 31, 2017 the Company had reserved the following shares of authorized but unissued common stock: As of January 31, As of July 31, 2017 2017 (in shares) Convertible preferred stock 10,610,966 — Options and RSUs outstanding and shares available for grant 5,814,388 12,083,108 Convertible preferred stock warrants 40,250 — Common stock warrants 25,000 1,897,562 Total 16,490,604 13,980,670 Stock Plan 2008 Stock Plan . In 2008, the Company adopted the 2008 Stock Plan (the 2008 Plan). Under the 2008 Plan, as amended, 7,688,078 shares of common stock were reserved for the issuance of incentive stock options (ISOs), nonstatutory stock options (NSOs), and stock purchase rights to employees, directors, and consultants of the Company as of January 31, 2017. Options may be granted with exercise prices at no less than 100% of the fair value of the common stock on the date of grant. ISOs granted under the 2008 Plan generally vest 25% after the completion of one year of service and then vest in equal monthly installments over the next 36 months of service and expire ten years from the date of grant. NSOs vest according to the specific agreement and expire ten years from the date of grant. Early Exercise of Stock Options . The Company’s 2008 Plan allows select employees to exercise options prior to vesting. The Company has a right to repurchase unvested shares acquired upon early exercise of options at the original exercise price upon termination of employment. The repurchase rights will lapse in accordance with the original vesting schedule of the option. Early exercises of options are not deemed to be substantive exercises for accounting purposes and, accordingly, amounts received for early exercises are recorded as a liability included in other long-term liabilities. These amounts are reclassified to common stock as the underlying options vest. As of January 31, 2017 and July 31, 2017, shares held by employees that were subject to repurchase were 49,234 and 57,461, respectively, with an aggregate purchase price of $0.5 million and $0.5 million, respectively. Repurchase of Common Stock . In 2013, one executive and one non-executive employee exercised stock options early in exchange for full-recourse notes in an amount of $2.2 million bearing annual interest of 1.62% to 1.64% payable to the Company. In addition, one executive employee exercised stock options early in exchange for a partial recourse promissory note in an amount of $6.6 million bearing interest of 1.92% payable to the Company. In May 2017, the executive employee with the full-recourse promissory note was issued 88,520 shares (“Additional Options) of fully vested and exercisable options. In June 2017, the outstanding principal and interest balance of $1.0 million was repaid in full by the executive employee through the Company’s repurchase of 88,520 shares of the executive employee’s common stock. The shares were valued at $13.68 per share, which is the fair market value of the Company’s common stock as determined by the Company’s compensation committee on the date of the repurchase. The Company deems the issuance of 88,520 Additional Options, and its purchase of the shares of common stock issued pursuant to the note, in lieu of forgiving the executive employee’s loan altogether, as a stock repurchase. The Company recorded additional stock-based compensation expense of $0.5 million during the three months ended July 31, 2017, representing the extent that the fair value of the 88,250 Additional Options and the value of the loan forgiven exceeds the fair value of the 88,520 shares of common stock repurchased. In May 2017, the executive employee with the partial recourse promissory note was issued 501,104 Additional Options that are fully vested and exercisable on the date of the grant. In June 2017, the outstanding principal and interest balance of $6.9 million was repaid in full by the executive employee through the Company’s repurchase of 501,104 shares of the executive employee’s common stock. The shares were valued at $13.68 per share, which is the fair market value of the Company’s common stock as determined by the Company’s compensation committee on the date of the repurchase. The repayment of the promissory note through the Company’s repurchase of all 501,104 shares purchased under the note, and the issuance of the 501,104 Additional Options, is treated as a modification of the promissory note. The Company did not record any additional compensation for the modification as the fair value of these Additional Options did not exceed the fair value of the promissory note. 2017 Equity Incentive Plan. In May 2017, the Company adopted the 2017 Equity Incentive Plan (the 2017 Plan) and approved the termination of the 2008 Plan, effective concurrently upon the closing of the Company’s IPO. Under the 2017 Plan, 4,537,000 shares of common stock were reserved for the issuance of incentive stock options (ISOs), nonstatutory stock options (NSOs), restricted stock, stock appreciation rights and performance awards to employees and directors of the Company. Options may be granted with exercise prices at no less than 100% of the fair value of the common stock on the date of grant. In addition, shares subject to outstanding awards granted under the 2008 Plan that expire or otherwise terminate without having been exercised in full or are forfeited to the Company due to failure to vest, will be allocated to the 2017 Plan reserve. Options may be granted with exercise prices at no less than 100% of the fair value of the common stock on the date of grant. ISOs and NSOs granted under the 2017 Plan generally will vest 25% after the completion of on year of service and then vest in equal monthly installments over the next 36 months of service and expire ten years from the date of grant. NSOs vest according to the specific agreement and expire ten years from the date of grant. Stock-Based Compensation The following is a summary of shares available for grant under the Company’s stock plans for the year ended January 31, 2017 and the six months ended July 31, 2017: Outstanding—January 31, 2016 156,417 Authorized 1,405,316 Options and RSUs granted (1,240,032 ) Options and RSUs canceled 738,891 Outstanding—January 31, 2017 1,060,592 Authorized 7,024,194 Options and RSUs granted (6,957,545 ) Options and RSUs canceled 3,462,345 Outstanding—July 31, 2017 4,589,586 The following is a summary of stock option activity under the 2008 Plan for the year ended January 31, 2017 and for the six months ended July 31, 2017: Options Outstanding Number of shares underlying outstanding options Weighted- average exercise price Weighted- average remaining contractual term Aggregate Intrinsic Value (in years) (in thousands) Outstanding—January 31, 2016 4,421,035 $ 16.34 8.2 $ 59,882 Options granted 920,147 $ 30.25 Options exercised (168,380 ) $ 13.63 Options canceled (704,841 ) $ 19.35 Outstanding—January 31, 2017 4,467,961 $ 18.83 7.5 $ 60,756 Options granted 1,473,046 $ 17.58 Options exercised (720,985 ) $ 9.53 Options canceled (162,495 ) $ 21.76 Outstanding—July 31, 2017 5,057,527 $ 12.78 8.0 $ 891 Vested and exercisable January 31, 2017 2,380,167 $ 13.55 6.8 $ 44,719 July 31, 2017 2,737,763 $ 12.03 7.4 $ 891 Vested and Expected to Vest January 31, 2017 (1) 4,174,361 $ 18.54 7.5 $ 57,552 July 31, 2017 5,057,527 $ 12.78 8.0 $ 891 (1) The expected to vest options are a result of applying the forfeiture rate assumptions to unvested options outstanding. The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying options and the fair value of the common stock for options that had exercise prices that were lower than the fair value per share of the common stock. The aggregate intrinsic value of stock options exercised for the six months ended July 31, 2016 and 2017 was $0.9 million and $0.6 million, respectively. The aggregate intrinsic value of stock options exercised for the three months ended July 31, 2016 and 2017 was $0.3 million and $0, respectively. The weighted-average grant date fair value of options granted during the six months ended July 31, 2016 and 2017 was $17.52 and $8.28 per share, respectively. The weighted-average grant date fair value of options granted during the three months ended July 31, 2016 and 2017 was $18.03 and $5.92 per share, respectively. The total grant date fair value of options vested during the six months ended July 31, 2016 and 2017 was $5.5 million and $13.6 million, respectively. The total grant date fair value of options vested during the three months ended July 31, 2016 and 2017 was $2.5 million and $8.8 million, respectively. The valuation model for stock-based compensation expense requires the Company to make assumptions and judgments about the variables used in the calculation, including the expected term (weighted-average period of time that the options granted are expected to be outstanding), the expected volatility of the Company’s common stock, a risk-free interest rate and expected dividend yield. The weighted-average assumptions used to estimate the fair value of stock options granted in the following periods was: Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Risk-free interest rate 1.39 % 1.81 % 1.51 % 1.86 % Expected term (in years) 6.02 5.31 6.06 5.45 Expected volatility 64.70 % 46.05 % 63.11 % 47.96 % Dividend yield - - - - The fair value of each grant of stock options was determined using the Black-Scholes option-pricing model. The inputs used in the Black-Scholes option-pricing model is subjective and generally requires significant judgment to determine. All stock-based payment awards are amortized on a straight-line basis over the requisite service periods of the awards, which are generally the vesting periods. Compensation expense related to options granted to non-employees is recognized as the equity instruments vest, and such options are revalued at each reporting date. As a result, compensation expense related to unvested options granted to non-employees fluctuates as the fair value of the Company’s common stock fluctuates. Restricted Stock Units The Company grants RSUs to its executives, employees, and members of the Board. The Board determines the vesting conditions for RSUs and the period over which the RSUs will vest and be settled. RSUs convert into common stock upon vesting and settlement. Performance RSUs . The Company grants RSUs that contain vesting requirements that must be satisfied on or before the expiration date of the RSUs in order for an RSU to vest (in whole or in part): (i) a time and service-based requirement and (ii) performance conditions (altogether, PSUs). The time and service-based requirement is met by the recipient’s continuing employment and service with the Company from grant date through the applicable date. In general, the time and service-based requirement is two years. The performance conditions consist of the occurrence of a liquidity event and, in some instances, individual performance conditions by the recipient. The liquidity event performance condition is not satisfied unless and until the earlier to occur of (i) a change of control or (ii) the first date following the expiration of all lockup and blackout periods following an IPO; in either case, prior to the expiration date of the PSU and subject to the recipient’s continuing employment and service with the Company through the applicable date. Stock-based compensation expense is measured and recognized in the financial statements based on the fair value of the Company’s common stock on the date of the grant. Stock-based compensation expense is recognized, net of estimated and actual forfeitures, over the requisite service period of the award, and upon performance conditions being met. A summary of the RSU activity during the six months ended July 31, 2017 is presented below: Shares Weighted average grant date fair value per share Outstanding January 31, 2017 285,835 $ 30.60 Awarded 2,193,088 $ 19.41 Released - - Forfeited (42,928 ) $ 29.45 Outstanding July 31, 2017 2,435,995 $ 20.55 Employee Stock Purchase Plan In May 2017, the Board of the Company authorized and approved a 2017 Employee Stock Purchase Plan (the “ESPP”). A total of 907,000 shares of common stock were initially reserved for issuance under the ESPP. The number of shares of common stock available for sale under the ESPP will also include an annual increase on the first day of each fiscal year beginning in fiscal 2019, equal to the lesser of: 907,000 shares, 1% of the outstanding shares of classes of common stock as of the last day of the Company’s immediately preceding fiscal year, or such other amount as may be determined by the Board. The ESPP allows eligible employees to purchase shares of the Company’s common stock at a discount through payroll deductions of up to 15% of eligible compensation, subject to caps of $25,000 of value in any calendar year and 2,000 shares on any purchase date. The ESPP provides for 24-month offering periods generally beginning March and September of each year, with the exception of the initial offering period which commenced on June 29, 2017. Each offering period consists of four six-month purchase periods with the initial offering period having its first purchase on March 20, 2018. On each purchase date, participating employees will purchase common stock at a price per share equal to 85% of the lesser of the fair market value of the Company’s common stock on (i) the first trading day of the applicable offering period and (2) the last trading day of each purchase period in the applicable offering period. If the stock price of the Company's common stock on any purchase date in an offering period is less than the stock price on the first trading day of that offering period, participants will be withdrawn from the current offering period following their purchase of shares on the purchase date and will be automatically re-enrolled in a new offering period. For the first offering period, which began on June 29, 2017, the fair market value of the common stock used for the first offering period was $7.00, the IPO price of the Company’s common stock. The Company uses the Black-Scholes option-pricing model to determine the fair value of shares purchased under the ESPP with the following weighted average assumptions on the date of the grant: Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Risk-free interest rate n/a 1.24 % n/a 1.24 % Expected term (in years) n/a 1.44 n/a 1.44 Expected volatility n/a 43.00 % n/a 43.00 % Dividend yield n/a - n/a - Stock-Based Compensation Expense Total stock-based compensation expense recognized for stock award in the consolidated statements of operations is as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Stock-based compensation: Cost of product revenue 67 690 129 761 Cost of support and maintenance revenue 96 538 172 653 Research and development 1,384 8,380 2,860 9,656 Sales and marketing 1,027 4,638 2,250 5,682 General and administrative 1,069 8,207 2,030 9,166 Total stock-based compensation expense 3,643 22,453 7,441 25,918 Total stock-based compensation expense recognized for stock awards in the consolidated statements of operations by type of awards is as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Stock-based compensation: Stock options (1) 3,643 9,865 7,441 13,330 RSUs - 12,398 - 12,398 ESPP - 190 - 190 Total stock-based compensation expense 3,643 22,453 7,441 25,918 (1) In May 2017, the Company repriced each outstanding and unexercised stock option held by current service providers with an exercise price in excess of $13.68 per share (each, an "Eligible Option"), to a new exercise price of $13.68 per share, which is no less than the fair market value of the Company's common stock as determined by the Company's compensation committee on the date of repricing. Eligible Options covering 3,291,783 shares of the Company's common stock with a weighted average exercise price of $24.31 were repriced. Additional stock-based compensation expense related to this repricing is $7.3 million, of which $2.6 million was recognized immediately on the date of repricing for Eligible Options that have vested. As of July 31, 2017, the total unrecognized stock-based compensation expense related to the outstanding stock awards was $73.9 million, which is expected to be recognized over a weighted-average period of 2.2 years. Common Stock Warrants In connection with the Loan and Security Agreement with SVB, the Company issued immediately exercisable and fully vested warrants to purchase 4,167 shares of common stock. The fair value of the warrant was $27,000 and was recorded in other income (expense), net in the consolidated statements of operations. In July 2013, upon drawing down on the term loan, the Company issued the lender a warrant to purchase an additional 20,833 shares of common stock. The warrants have an exercise price of $7.80. The warrants expire in May 2023. The Company determined the fair value of the additional common stock warrants on the date of issuance to be $0.1 million, which was recorded as a debt discount. The debt discount was amortized to interest expense over the loan term using the effective-interest rate method. In connection with the total term loan balance being repaid during the year ended January 31, 2015, the unamortized debt discount of $0.1 million was written off. In June 2017, the Company amended its certificate of incorporation to eliminate certain variable rate adjustments to the conversion ratios of the Series E, E-1 and F Convertible Preferred Stock and replaced them with certain fixed conversion ratios. As an integral part of the transaction, the Company issued warrants to purchase up to 1,666,665 shares of common stock to the Series E-2 and F-2 Holders. The warrants will become exercisable for ten years from the date of grant and have an exercise price of $16.44 per share. The warrants may be exercised on a cashless basis. The warrants from this arrangement remain outstanding as of July 31, 2017. In addition, immediately prior to the closing of the Company’s IPO, all convertible preferred stock warrants automatically converted into common stock warrants. Accordingly, the Company revalued the convertible preferred stock warrants and reclassified the outstanding preferred stock warrant liability balance to additional paid-in capital with no further remeasurements as the common stock warrants are now deemed permanent equity. As a result of the automatic conversion, 68,633 shares of convertible preferred stock warrants converted into an aggregate 205,897 shares of common stock warrants. Of the 205,897 shares of common stock warrants, 34,058 shares will not be exercisable until such time that additional loan amount of $10.0 million under the New Facility Agreement is drawn

401(k) Plan

401(k) Plan	6 Months Ended
	Jul. 31, 2017
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
401(k) Plan	(9) 401(k) Plan The Company maintains a tax-qualified retirement plan, or the 401(k) plan. Participants are able to defer eligible compensation up to applicable annual Internal Revenue Code limits. All participants’ interests in their deferrals are 100% vested when contributed. The 401(k) plan allows the Company to make matching contributions and profit sharing contributions to eligible participants. No contributions were made for the six months ended July 31, 2016 and 2017.

Net Loss per Share Attributable

Net Loss per Share Attributable to Common Stockholders	6 Months Ended
	Jul. 31, 2017
Earnings Per Share [Abstract]
Net Loss Per Share Attributable To Common Stockholders	(10) Net Loss Per Share Attributable To Common Stockholders Basic and diluted net loss per share attributable to common stockholders is presented in conformity with the two-class method required for participating securities. The Company’s convertible preferred stock that was outstanding prior to the closing of the IPO is considered a participating security with respect to the periods during which it was outstanding. Participating securities do not have a contractual obligation to share in the Company’s losses. As such, for the periods the Company incurs net losses, there is no impact on the calculated net loss per share attributable to common stockholders in applying the two-class method. Basic net loss per share attributable to common stockholders is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period. The diluted net loss per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, participating securities, stock options to purchase common stock, RSUs, warrants to purchase common stock and convertible preferred stock are considered to be common stock equivalents and have been excluded from the calculation of diluted net loss per share attributable to common stockholders, as their effect is antidilutive. The computation of basic and diluted net loss per share is as follows (in thousands, except share and per share data): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Numerator: Net loss $ (25,672 ) $ (51,667 ) $ (56,483 ) $ (82,347 ) Deemed dividend to Series E and E-1 Convertible Preferred Stock - - - (6,588 ) Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock - 26,336 - 26,336 Net loss attributable to common stockholders $ (25,672 ) $ (25,331 ) $ (56,483 ) $ (62,599 ) Denominator: Weighted-average common shares outstanding 3,498,767 12,405,014 3,487,074 8,095,084 Weighted-average unvested common shares subject to repurchase (89,644 ) (61,184 ) (89,705 ) (49,666 ) Weighted-average shares—basic and diluted 3,409,123 12,343,830 3,397,369 8,045,418 Net loss per share attributable to common stockholders— basic and diluted $ (7.53 ) $ (2.05 ) $ (16.63 ) $ (7.78 ) The potential absolute shares of common stock that were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive are as follows: As of July 31, 2016 2017 (in shares) Convertible preferred stock (on an if-converted basis) 10,610,966 - Stock options and RSUs 4,326,500 7,493,522 Early exercised stock options 84,008 57,461 Convertible preferred stock warrants 40,250 - Common stock warrants 25,000 1,897,562 Total 15,086,724 9,448,545

Income Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	(11) Income Taxes During the three and six months ended July 31, 2017, the Company’s provision for income taxes of $0.1 million and $0.3 million, respectively, was primarily attributable to foreign income tax provision in profitable foreign jurisdictions in which it conducts business. The Company’s provision for income taxes for the three and six months ended July 31, 2016 was $0.2 million and $0.4 million, respectively, and was primarily attributable to foreign income tax expense in profitable foreign jurisdictions in which it conducts business.

Segment Information

Segment Information	6 Months Ended
	Jul. 31, 2017
Segment Reporting [Abstract]
Segment Information	(12) Segment Information The Company’s chief operating decision maker is a group which is comprised of its Chief Executive Officer and Chief Financial Officer. This group reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. Accordingly, the Company has a single reportable segment. The following table sets forth revenue by geographic area by customer location (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 United States $ 18,868 $ 25,934 $ 33,453 $ 48,597 EMEA 4,332 5,406 8,097 9,138 Rest of the World 4,356 3,526 8,882 7,486 Total revenue $ 27,556 $ 34,866 $ 50,432 $ 65,221 As of January 31, 2017 and July 31, 2017, $10.2 million and $9.8 million, respectively, of the Company’s long-lived assets were located in the United States.

Related Party and Other Transac

Related Party and Other Transactions	6 Months Ended
	Jul. 31, 2017
Related Party Transactions [Abstract]
Related Party and Other Transactions	(13) Related-Party and Other Transactions In 2013, one executive and one non-executive employee exercised stock options early in exchange for full-recourse promissory notes in an amount of $2.2 million bearing annual interest of 1.62% to 1.64% payable to the Company. These notes are secured by the underlying shares purchased and such unvested shares can be repurchased by the Company upon employee termination at the original issuance price. The promissory note and accrued interest for the non-executive will become due and payable in full beginning in August 2018 , but will become due earlier if the non-executive terminates services. The Company is recording the notes receivable balance within equity with a corresponding entry to additional paid-in capital upon the vesting of these shares. In June 2017, the outstanding principal and interest balance of $1.0 million was repaid in full by the executive employee through the Company’s repurchase of 88,520 shares of the executive employee’s common stock. Employee notes receivable as of January 31, 2017 and July 31, 2017 was $1.5 million and $0.7 million, respectively. In 2013, one executive employee exercised stock options early in exchange for a promissory note in an amount of $6.6 million bearing interest of 1.92% payable to the Company. This note is secured by the underlying shares purchased and such unvested shares can be repurchased by the Company upon employee termination at the original issuance price. Because the Company only has partial recourse under the promissory note, the Company deemed the exercise of the stock options to be nonsubstantive. As such, the note receivable is not reflected in these consolidated financial statements and the related stock transaction will be recorded at the time the note receivable is settled in cash. In June 2017, the outstanding principal and interest balance of $6.9 million was repaid in full by the executive employee through the Company’s repurchase of 501,104 shares of the executive employee’s common stock. In July 2015, certain executives of the Company participated in the Series F financing round, and acquired 11,353 shares of Series F Convertible Preferred Stock with an aggregate value of $0.5 million. In June 2017, the Company amended its certificate of incorporation to eliminate certain variable rate adjustments to the conversion ratios of the Series E, E-1 and F Convertible Preferred Stock and replaced them with certain fixed conversion rations. Pursuant to these fixed conversion rations, the executives who participated in the series F financing round were issued additional shares of common stock immediately prior the closing of the Company’s IPO.

Subsequent Events

Subsequent Events	6 Months Ended
	Jul. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	(14) Subsequent Events On June 29, 2017, the Company entered into an underwriting agreement (the “Underwriting Agreement”) with Morgan Stanley & Co. LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated (the “Underwriters”), relating to the Company’s IPO. The Company granted the Underwriters a 30-day option to purchase up to an additional 1,285,800 shares, solely to cover over-allotments. The Underwriters exercised their over-allotment option and the second closing of the IPO took place on August 1, 2017, at which time the Company sold 1,000,000 shares of common stock. In September 2017, the Company approved grants of options under the 2017 Plan to certain eligible employees to purchase a total of 58,966 shares, and grants of PSUs under the 2017 Plan to certain eligible employees covering a total of 3,662,534 shares. The total grant date fair value for these options is $0.1 million and is $16.3 million for these PSUs. Expensing for these PSUs will commence upon grant and continue through the final vesting date.

Basis of Presentation and Sum20

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jul. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	Principles of consolidation The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Such estimates include, but are not limited to, the determination of the fair value of deliverables included in multiple element revenue arrangements, valuation of inventories, warranty liability, the useful lives of property and equipment, fair value of the Company’s common stock, value of convertible preferred stock warrant liability, the value of stock options granted, accounting for income taxes, including the valuation reserve on deferred tax assets and accounting for uncertain tax positions, and contingencies. Actual results could differ materially from these estimates. Management evaluates these estimates and assumptions on an ongoing basis using historical experience and other factors and makes adjustments when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could materially differ from those estimates and assumptions.
Concentrations	Concentrations The Company’s financial instruments that are exposed to concentrations of credit risk are primarily cash and cash equivalents, investments, and accounts receivable. Cash and cash equivalents, and investments are maintained primarily at one financial institution, and deposits will generally exceed the amount of insurance provided on such deposits. Risks associated with cash and cash equivalents, and investments are mitigated by banking with a creditworthy institution. The Company has not experienced any losses on its deposits of cash and cash equivalents or its investments. The Company sells its products primarily through channel partners and distributors (collectively, Partners), and occasionally directly to customers. The Company’s accounts receivable are unsecured and represent amounts due to the Company based on contractual obligations of the Company’s Partners and direct customers. The Company mitigates credit risk with respect to accounts receivable by performing ongoing credit evaluations of its Partners and direct customers to assess the probability of collection based on a number of factors, including, but not limited to, past transaction experience with its Partners and direct customers, evaluation of their credit history, limiting the credit extended, and review of the invoicing terms of the contract. The Company generally does not require its Partners and direct customers to provide collateral to support accounts receivable. The Company records an allowance for doubtful accounts for those receivables that are determined not to be collectible. For each Partner or direct customer greater than 10%, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows: Revenue for the Three Months Ended July 31, Revenue for the Six Months Ended July 31, Accounts as of January 31, Accounts Receivable as of July 31, 2016 2017 2016 2017 2017 2017 Partner A * 24% * 22% 16% 29% Partner B * 19% * 10% * 12% * Represents less than 10%. The Company outsources substantially all of its manufacturing to one independent contract manufacturer. The inability of the manufacturer or supplier to fulfill the Company’s supply or quality requirements or performance failures of the Company’s products could result in lost sales and damage to the Company’s end-customer relationships, which would adversely impact the Company’s business, financial condition and operating results.
Foreign Currency Translation and Transactions	Foreign Currency Translation and Transactions The financial position and operating results of the Company’s international subsidiaries in the United Kingdom (U.K.), Japan, Australia, Ireland and Singapore have been measured using their respective local currency as the functional currency. Assets and liabilities are translated into U.S. dollars at the exchange rate in effect on the respective consolidated balance sheet date. Revenue and expenses are translated into U.S. dollars using average exchange rates for the corresponding period. Translation adjustments are recorded within other comprehensive loss as a separate component of stockholders’ deficit. There is no income tax effect of currency translation adjustments related to foreign subsidiaries as the Company has no present intention of remitting the undistributed earnings of its foreign subsidiaries. Gains and losses from the remeasurement of foreign currency-denominated balances into the functional currency are included in Other income, net in the Company’s consolidated statements of operations. Remeasurement gains and losses were immaterial for the three and six months ended July 31, 2016 and 2017.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying value of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, investments, accounts payable and accrued and other current liabilities, approximates fair value due to the short period of time to maturity, receipt or payment. The carrying amount of the Company’s revolving line of credit and term loan approximates its fair value as the stated interest rates approximate market rates currently available to the Company.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments, such as money market funds, with original maturities of 90 days or less at date of purchase, to be cash equivalents. Cash and cash equivalents consist principally of checking account deposits and money market funds.
Accounts Receivable	Accounts Receivable Accounts receivable are recorded at the invoiced amounts and do not bear interest. The Company maintains an allowance for doubtful accounts for estimated losses inherent in its accounts receivable portfolio and an allowance for returns. An allowance for doubtful accounts is determined based on the aging of the Company’s trade receivables, historical experience, and management judgment. The Company writes off trade receivables against the allowance when management determines a balance is uncollectible and no longer actively pursues collection of the receivable. An allowance for returns is determined based on historical returns and management judgment. As of January 31, 2017 and July 31, 2017, allowance for doubtful accounts was $0.1 million and $0, respectively. Allowance for returns was $0.3 million and $0.4 million as of January 31, 2017 and July 31, 2017, respectively.
Inventories	Inventories Inventories consist primarily of raw materials related to component parts and finished goods. Finished goods include inventory held for sale, service inventory held at third-party service inventory depots in support of customer service agreements, and customer evaluation inventory. The following is a summary of the Company’s inventories by major category (in thousands): As of January 31, As of July 31, 2017 2017 Raw materials $ 264 $ 229 Finished goods 6,245 5,951 $ 6,509 $ 6,180 Inventory values are stated at the lower of cost (on a first-in, first-out method), or market value. A provision is recorded to adjust inventory to its estimated realizable value when inventory is determined to be in excess of anticipated demand or obsolete. Specifically, customer support inventory is written down to its net realizable value based upon the estimated loss of utility starting from the date the customer support inventory is placed in the third-party service inventory depots through the estimated period of service obligation fulfillment; and customer evaluation inventory is periodically reviewed and reserved for excess and obsolescence. The Company recorded inventory writedowns of $0.6 million and $0.9 million for the six months ended July 31, 2016 and 2017, respectively, of which $0 and $0.2 million, respectively, were recorded in cost of product revenue and $0.6 million and $0.7 million, respectively, were recorded in cost of support and maintenance revenue in the consolidated statements of operations. Inventory writedowns for the three months ended July 31, 2016 and 2017 were $0.4 million and $0.5 million, respectively, of which $0 and $0.1 million, respectively, were recorded in cost of product revenue and $0.4 million and $0.4 million, respectively, were recorded in cost of support and maintenance revenue in the consolidated statements of operations.
Investments	Investments The Company’s primary objectives of its investment activities are to preserve principal, provide liquidity, and maximize income without significantly increasing risk. Some of the securities the Company invests in are subject to interest risk. To minimize this risk, the Company maintains its portfolio of cash, cash equivalents, short-term and long-term investments in a variety of securities, which may include commercial paper, money market funds, U.S. government and agency securities, and corporate debt securities. The Company classifies its investments as available-for-sale at the time of purchase since it is intended that these investments are available for current operations, and include these investments on the accompanying consolidated balance sheets as either short-term or long-term investments depending on their maturity. Investments not considered cash equivalents and with maturities of one year or less from the consolidated balance sheet date are classified as short-term investments. Investments with maturities greater than one year from the consolidated balance sheet date are classified as long-term investments. Investments are reported at fair value and are subject to periodic impairment review. Unrealized gains and losses related to changes in the fair value of these securities are recognized in accumulated other comprehensive loss net of tax, unless they are determined to be other-than-temporary impairments. The ultimate value realized on these securities is subject to market price volatility until they are sold. Investments are considered impaired when a decline in fair value is judged to be other-than-temporary. The Company consults with investment managers and considers available quantitative and qualitative evidence in evaluating potential impairment of investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, the Company evaluates, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and the Company’s intent and ability to hold the investment to maturity. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.
Property and Equipment, Net	Property and Equipment, Net Property and equipment, including leasehold improvements, are stated at cost, less accumulated depreciation and amortization. Depreciation is computed using the straight-line method over the estimated useful lives of the related assets. Depreciation on property and equipment, excluding leasehold improvements and sales demonstration equipment, ranges from 24 to 60 months. Sales demonstration equipment is depreciated over the estimated useful lives of the respective assets, which range up to 24 months. Leasehold improvements are amortized over the shorter of the estimated useful lives of the respective assets or the remaining property lease terms, which range up to eight years. Upon the retirement or disposition of property and equipment, the related costs and accumulated depreciation are removed and any related gain or loss is recorded in the consolidated statements of operations as an operating expense.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company evaluates events and changes in circumstances that could indicate carrying amounts of long-lived assets, consisting of property and equipment, may not be recoverable. When such events or changes in circumstances occur, the Company assesses the recoverability of long-lived assets by determining whether or not the carrying value of such assets will be recovered through undiscounted expected future cash flows. If the total of the future undiscounted cash flows is less than the carrying amount of an asset, the Company records an impairment charge for the amount by which the carrying amount of the asset exceeds the fair value of the asset. When the Company determines that the useful lives of assets are shorter than was originally estimated, the Company accelerates the rate of depreciation over the assets’ new, shorter useful lives. Through July 31, 2017, the Company did not write down any of its long-lived assets as a result of impairment.
Warranties	Warranties The Company provides a one-year warranty for hardware components covering material defects in materials and workmanship. In addition, the Company provides a 90-day warranty on the software in its products for nonconformance with documented specifications. With respect to the hardware warranty obligation, the Company’s contract manufacturer is generally required to repair or replace defective hardware resulting from defective workmanship within one year of shipment. Furthermore, the Company’s support contracts provide for the same parts replacement that end-users are entitled to under the warranty program, except that replacement parts are delivered according to targeted response times to minimize disruption to the end-users’ critical business applications. Substantially all end-users purchase support contracts. Given that substantially all products are sold together with support contracts, the Company has limited exposure related to warranty costs and therefore no warranty reserve has been recorded.
Revenue Recognition	Revenue Recognition The Company generates revenue from sales of enterprise cloud platform solutions and related support and maintenance. The Company derives revenue primarily from two sources: (i) Product revenue, which includes hardware and perpetual software license revenue and (ii) Support and maintenance revenue, which includes support, installation services and training. Revenue is recognized when all of the following criteria are met: persuasive evidence of an arrangement exists; the product or service has been delivered; the sales price is fixed or determinable; and collection is reasonably assured. The Company defines each of the four criteria above as follows: • Persuasive Evidence of an Arrangement Exists. The Company uses stand-alone purchase orders, signed sales quotations or purchase orders pursuant to the terms and conditions of a master sales agreement to support the evidence of an arrangement with Partners and direct customers. • Delivery has Occurred. The Company uses shipping documentation to verify delivery of products. Provided that all other revenue recognition criteria have been met, the Company typically recognizes product revenue upon shipment, as title and risk of loss are transferred at that time. Products are typically shipped directly by the Company to Partners and direct customers. Support and maintenance revenue is recognized over time as the services are delivered. The Company generally does not have significant obligations for future performance, such as rights of return or pricing credits, associated with the sales of its products. It is the Company’s practice to identify an end user prior to shipment to a Partner. • The Sales Price is Fixed or Determinable. The Company assesses whether the fee is fixed or determinable based on the payment terms associated with the transaction. If the terms are extended beyond the Company’s normal payment terms, the Company will recognize revenue as the payments become due. Payments from Partners are not contingent on the Partners’ receiving payment from the end-users. • Collection is Reasonably Assured. The Company assesses probability of collection on an individual basis. The Company’s Partners or customers are subjected to a credit review process that evaluates their financial condition and ability to pay. Support and maintenance revenue includes arrangements for software and technical support for the Company’s products. While purchasing support and maintenance is not mandatory, substantially all products shipped have been purchased together with a support contract. Support is offered under renewable, fee-based contracts and includes technical support, hardware repair and replacement parts, and software patches, bug fixes, updates, and upgrades. Support and maintenance revenue is initially deferred and recognized ratably over the life of the contract, with the related expenses, including the write down of customer support inventory to its net realizable value, recognized as incurred. Support and maintenance contracts range from one to five years. Unearned support revenue is included in deferred revenue. Professional service revenue primarily consists of fees the Company earns related to installation. While installation services are not contractually mandatory, customers occasionally purchase such services. The Company generally recognizes revenue from installation services upon delivery or completion of performance. Installation services are typically short term in nature. To date, revenue arising from installation service has been insignificant. The Company reports revenue net of sales taxes. Shipping charges billed to customers are included in product revenue and the related shipping and handling costs are included in cost of product revenue.
Multiple Element Arrangements	Multiple Element Arrangements The Company’s offering consists of hardware products containing software components that function together to provide the essential functionality of the product. Therefore, the Company’s hardware products (inclusive of the core software) are considered non-software deliverables and are not subject to industry-specific software revenue recognition guidance. The Company’s product revenue also includes revenue from the sale of stand-alone software products. Stand-alone software may operate on the Company’s hardware product, but is not considered essential to the functionality of the hardware and is subject to the industry-specific software revenue recognition guidance. The Company’s typical multiple element arrangement includes hardware product (including the essential software) and support. The Company may also sell stand-alone software as part of its multiple element arrangements. The Company considers each of these deliverables to be separate units of accounting based on whether the delivered items have stand-alone value. The Company has determined that each unit of accounting has stand-alone value because they are sold separately by the Company or, for hardware products, because the customers can resell them to others on a stand-alone basis. For certain arrangements with multiple deliverables, the Company allocates the arrangement fee to the non-software element based upon the relative selling price of such element and, if software and software-related elements such as support for the software element are also included in the arrangement, the Company allocates the arrangement fee to those software and software-related elements as a group. After such allocations are made, the amount of the arrangement fee allocated to the software and software-related elements is accounted for using the residual method. When applying the relative selling price method, the Company determines the selling price for each element using vendor-specific objective evidence (VSOE) of selling price, if it exists, or if not, third-party evidence (TPE) of selling price, if it exists. If neither VSOE nor TPE of selling price exist for an element, the Company uses its best estimated selling price (BESP) for that element. The revenue allocated to each element is then recognized when the basic revenue recognition criteria are met for that element. When an arrangement includes stand-alone software products and related support, consideration is allocated to the software deliverable as described above. The Company uses the residual method to recognize revenue related to this consideration when a product agreement includes one or more elements to be delivered at a future date and VSOE of the fair value of all undelivered elements exists. In the majority of the Company’s contracts, the only element that remains undelivered at the time of delivery of the product is support services. Under the residual method, the VSOE of fair value of the undelivered elements is deferred and the remaining portion of the contract fee is recognized upfront as product revenue. If evidence of the VSOE of fair value of the undelivered elements does not exist, all revenue is deferred and recognized at the earlier of (i) when delivery of those elements occurs or (ii) when fair value can be established unless support services is the only undelivered element, in which case, the entire arrangement fee is recognized ratably over the contractual period of the support services. VSOE of fair value for elements of an arrangement is based upon the normal pricing and discounting practices for those deliverables when sold separately. In determining VSOE, the Company requires that a substantial majority of the selling prices for a deliverable fall within a reasonably narrow pricing range, evidenced by a substantial majority of such historical stand-alone transactions falling within a reasonably narrow range. The Company is not able to determine TPE for its products or services. TPE is determined based on competitor prices for similar deliverables when sold separately. Generally, the Company’s go-to-market strategy differs from that of its peers and its offerings contain a significant level of differentiation such that the comparable pricing of products with similar functionality cannot be obtained. Furthermore, the Company is unable to reliably determine what similar competitor products’ selling prices are on a stand-alone basis. When the Company is unable to establish the selling price of its deliverables using VSOE or TPE, the Company uses BESP in its allocation of arrangement consideration. The objective of BESP is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. The Company determines BESP for the purposes of allocating the arrangement by reviewing market factors including, but not limited to, pricing practices including discounting, the geographies in which the Company offers its products and services, and the type of customer (i.e., Partners or direct customers). Additionally, the Company considers historical transactions, including transactions whereby the deliverable was sold on a stand-alone basis. Deferred revenue consists of billings or payments received in advance of revenue recognition and primarily relates to support and maintenance. Deferred revenue that will be recognized during the twelve-month period following the balance sheet date is recorded as Deferred revenue, current and the remaining portion is recorded as Deferred revenue, non-current.
Research and Development	Research and Development Research and development expense consists of personnel costs, including stock-based compensation expense, for the Company’s research and development personnel and product development costs, including engineering services, development software and hardware tools, depreciation of capital equipment, facility costs, and information technology spend. Research and development costs are expensed as incurred. All costs incurred in the research and development of the Company’s software products are expensed as incurred until technological feasibility has been established. As of January 31, 2017 and July 31, 2017, there were no capitalized computer software development costs as the time between technological feasibility and general release is short.
Advertising Costs	Advertising Costs Advertising costs are expensed as incurred and are included in sales and marketing expense. Advertising costs for the six months ended July 31, 2016 and 2017 were $0.4 million and $1.9 million, respectively. Advertising costs for the three months ended July 31, 2016 and 2017 were $0.2 million and $0.9 million, respectively.
Commission Costs	Commission Costs Commission costs are expensed as incurred and are included in sales and marketing expense.
Stock-Based Compensation	Stock-Based Compensation Stock Options The Company measures and recognizes compensation expense for all stock-based awards made to employees based on estimated fair values on the date of grant. Stock-based awards consist of stock options. The Company uses the Black-Scholes option pricing model to estimate the value of stock-based compensation expense for all stock options. The related stock-based compensation expense is recognized on a straight-line basis, over the period in which an employee is required to provide service in exchange for the stock-based award, which is generally four years. Restricted Stock Units Stock-based compensation expense is measured and recognized in the financial statements based on the fair value of the Company’s common stock on the date of grant. Stock-based compensation expense is recognized over the requisite service period, and upon performance conditions being met.
Income Taxes	Income Taxes The Company recognizes income taxes under the asset-and-liability method. The Company recognizes deferred income tax assets and liabilities for the expected future consequences of temporary differences between the financial reporting and tax bases of assets and liabilities. These differences are measured using the enacted statutory tax rates that are expected to apply to taxable income for the years in which differences are expected to reverse. The Company recognizes the effect on deferred income taxes of a change in tax rates in income in the period that includes the enactment date. The Company records a valuation allowance to reduce its deferred tax assets to the net amount that the Company believes is more likely than not to be realized. The Company considers all available evidence, both positive and negative, including historical levels of income, expectations and risks associated with estimates of future taxable income, and ongoing tax planning strategies in assessing the need for a valuation allowance. Realization of deferred tax assets is dependent upon the generation of future taxable income, if any, the timing and amount of which are uncertain. Due to the history of losses the Company has generated in the past, the Company believes that it is not more likely than not that the deferred tax assets will be realized as of July 31, 2017. Accordingly, the Company has recorded a full valuation allowance on its net deferred tax assets. The Company recognizes tax benefits from uncertain tax positions only if they believe that it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. The Company makes adjustments to these reserves when facts and circumstances change, such as the closing of a tax audit or the refinement of an estimate. The provision for income taxes includes the effects of any reserves that are considered appropriate, as well as the related net interest and penalties. The Company expects to permanently reinvest undistributed earnings in foreign subsidiaries outside of the United States to fund future foreign operations. The Company projects that it will have sufficient cash flow in the United States and will not need to repatriate the foreign earnings to finance our domestic operations. If the Company were to distribute these earnings to the United States, it would be subject to U.S. income taxes, less any allowable foreign tax credits, and foreign withholding taxes. The Company has not recorded a deferred tax liability on any portion of our undistributed earnings in foreign subsidiaries. If the Company were to repatriate these earnings to the United States, any associated income tax liability would be insignificant.
Recently Issued and Not Yet Adopted Accounting Pronouncements	Recently Issued and Not Yet Adopted Accounting Pronouncements In August 2016, the Financial Accounting Standard Board (FASB) issued Accounting Standards Update (ASU) No. 2016-15, Classification of Certain Cash Receipts and Cash Payments In February 2016, FASB issued ASU No. 2016-02, Leases. In May 2014, FASB issued ASU, 2014-09, Revenue from Contracts with Customers The Company has engaged third party service providers to assist in its evaluation and system implementation. Furthermore, the Company has made and will continue to make investments in systems to enable timely and accurate reporting under the new standard. While the Company continues to assess the potential impact of the new standard, including the areas described above, it has not yet quantified the impact the new standard may have on its consolidated financial statements.

Basis of Presentation and Sum21

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jul. 31, 2017
Accounting Policies [Abstract]
Schedules of Concentration of Revenue and Accounts Receivable	For each Partner or direct customer greater than 10%, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows: Revenue for the Three Months Ended July 31, Revenue for the Six Months Ended July 31, Accounts as of January 31, Accounts Receivable as of July 31, 2016 2017 2016 2017 2017 2017 Partner A * 24% * 22% 16% 29% Partner B * 19% * 10% * 12% * Represents less than 10%.
Summary of Inventories by Major Category	The following is a summary of the Company’s inventories by major category (in thousands): As of January 31, As of July 31, 2017 2017 Raw materials $ 264 $ 229 Finished goods 6,245 5,951 $ 6,509 $ 6,180

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	The following table presents the fair value of the Company’s financial assets and liabilities using the above input categories as of January 31, 2017 and July 31, 2017 (in thousands): As of January 31, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 31,468 $ — $ — $ 31,468 Total cash equivalents 31,468 — — 31,468 Total assets measured at fair value $ 31,468 — — $ 31,468 Convertible preferred warrants: Series E Convertible Preferred Stock warrants (1) $ — $ — $ 568 $ 568 Total convertible preferred stock warrants — — 568 568 Total liabilities measured at fair value $ — $ — $ 568 $ 568 As of July 31, 2017 Level 1 Level 2 Level 3 Total Cash equivalents: Money market funds $ 36,678 $ — $ — $ 36,678 Corporate debt securities — 11,954 — 11,954 Total cash equivalents 36,678 11,954 — 48,632 Short-term investments: Corporate debt securities — 5,931 — 5,931 U.S. government and agency securities — 1,995 — 1,995 Total short-term investments — 7,926 — 7,926 Total assets measured at fair value $ 36,678 $ 19,880 $ — $ 56,558 (1) Series E Convertible Preferred Stock Convertible Preferred Stock warrant liability is included in Other long-term liabilities in the accompanying consolidated balance sheet. Immediately prior to the closing of the IPO, all convertible preferred stock warrants automatically converted into common stock warrants.
Summary of Changes in Fair Value of Convertible Preferred Stock Warrant Liability	A summary of the changes in the fair value of the Company’s convertible preferred stock warrant liability is as follows (in thousands): January 31, July 31, 2017 2017 Convertible preferred stock warrant liability—beginning balance $ 532 $ 568 Change in fair value* 36 (470 ) Issuance of convertible preferred stock warrants — 277 Reclassification of convertible preferred stock warrant liability to additional paid in capital — (375 ) Convertible preferred stock warrant liability—ending balance $ 568 $ — * Recorded in the consolidated statements of operations within Other income, net.

Balance Sheet Components (Table

Balance Sheet Components (Tables)	6 Months Ended
	Jul. 31, 2017
Balance Sheet Components Disclosure [Abstract]
Summary of Fair Value of Available for Sale Investments	The following table summarizes the fair value of the Company’s available for sale investments as of July 31, 2017 (in thousands): As of July 31, 2017 Carrying Amount Fair Value Due within one year $ 7,926 $ 7,926 Total $ 7,926 $ 7,926
Schedule of Property and Equipment, Net	Property and equipment, net consist of the following (in thousands): As of January 31, As of July 31, 2017 2017 Computer equipment $ 17,431 $ 19,508 Leasehold improvements 5,941 5,944 Sales demonstration equipment 5,903 6,098 Beta equipment 1,060 1,516 Furniture and fixtures 1,550 1,657 Software 649 660 Construction in progress 39 77 Total property and equipment 32,573 35,460 Less accumulated depreciation and amortization (22,163 ) (25,460 ) Total property and equipment, net $ 10,410 $ 10,000
Schedule of Accrued and Other Current Liabilities	Accrued and other current liabilities consist of the following (in thousands): As As of July 31, 2017 2017 Accrued sales and use taxes payable $ 1,697 $ 1,830 Accrued sales commissions 4,706 2,325 Accrued bonus 2,427 2,416 Accrued vacation 3,561 4,018 Other accruals 8,277 9,136 Total accrued and other current liabilities $ 20,668 $ 19,725

Debt Obligations (Tables)

Debt Obligations (Tables)	6 Months Ended
	Jul. 31, 2017
Debt Disclosure [Abstract]
Summary of Debt Obligations, Net of Debt Discount and Deferred Financing Costs	Debt obligations, net of debt discount and deferred financing costs, consist of the following (in thousands): As of January 31, As of July 31, 2017 2017 Revolving line of credit $ 13,962 $ 18,962 Term loan 34,952 49,540 Total debt 48,914 68,502 Less current portion of debt — (18,962 ) Total long-term portion of debt $ 48,914 $ 49,540
Scheduled Principal Payments on Outstanding Borrowings	As of January 31, 2017 and July 31, 2017, scheduled principal payments on the outstanding borrowings are as follows (in thousands): As of January 31, 2017: Fiscal 2019 $ 48,962 Total 48,962 Less debt discount (48 ) Less current portion — Non-current portion $ 48,914 As of July 31, 2017: Fiscal 2019 $ 18,962 Fiscal 2020 50,000 Total 68,962 Less debt discount (460 ) Less current portion (18,962 ) Non-current portion $ 49,540

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments under Noncancelable Operating Leases	As of January 31, 2017 and July 31, 2017, future minimum lease payments under noncancelable operating leases were as follows (in thousands): As of January 31, 2017: 2018 $ 7,121 2019 7,019 2020 7,127 2021 7,021 2022 7,068 Thereafter 3,984 Committed gross lease payments 39,340 Less proceeds from sublease rental (4,244 ) Net operating lease obligation $ 35,096 As of July 31, 2017: Remaining Fiscal 2018 $ 3,678 2019 7,068 2020 7,135 2021 7,021 2022 7,068 Thereafter 3,984 Committed gross lease payments 35,954 Less proceeds from sublease rental (3,655 ) Net operating lease obligation $ 32,299
Schedule of Future Minimum Lease Payments under Noncancelable Capital Leases	As of January 31, 2017 and July 31, 2017, future minimum lease payments under noncancelable capital leases were as follows (in thousands): As of January 31, 2017: 2018 $ 216 2019 96 2020 77 Total 389 Interest (20 ) Total $ 369 As of July 31, 2017: Remaining Fiscal 2018 $ 67 2019 96 2020 77 Total 240 Interest (12 ) Total $ 228

Convertible Preferred Stock (Ta

Convertible Preferred Stock (Tables)	6 Months Ended
	Jul. 31, 2017
Equity [Abstract]
Schedule of Conversion of Convertible Preferred Stock into Common Stock	Prior to the closing of Company’s IPO, the Company’s convertible preferred stock was issuable in series. The number of authorized, issued, and outstanding shares of convertible preferred stock, the issuance date, net proceeds and the aggregate liquidation preferences for the convertible preferred stock as of January 31, 2017 and immediately prior to the automatic conversion of the convertible preferred stock into common stock were as follows (in thousands, except share data): Date issued Number of shares authorized Shares issued and outstanding Liquidation preference A August 2008 1,533,329 1,533,329 $ 4,600 B July 2009 2,119,997 2,119,997 12,000 C May 2011 1,312,311 1,312,311 18,100 D July 2012 1,092,149 1,092,149 25,000 E January 2014 1,681,912 1,641,662 71,377 E-1 January 2014 83,333 83,333 3,623 F July 2015 2,828,185 2,828,185 124,554 Total outstanding as of January 31, 2017 10,651,216 10,610,966 259,254 F February 2017 28,383 — — Total outstanding immediately prior to the closing of the Company’s IPO 10,679,599 10,610,966 $ 259,254

Common Stock (Tables)

Common Stock (Tables)	6 Months Ended
	Jul. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Reserved Shares of Authorized but Unissued Common Stock	As of January 31, 2017 and July 31, 2017 the Company had reserved the following shares of authorized but unissued common stock: As of January 31, As of July 31, 2017 2017 (in shares) Convertible preferred stock 10,610,966 — Options and RSUs outstanding and shares available for grant 5,814,388 12,083,108 Convertible preferred stock warrants 40,250 — Common stock warrants 25,000 1,897,562 Total 16,490,604 13,980,670
Schedule of Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options Granted	The weighted-average assumptions used to estimate the fair value of stock options granted in the following periods was: Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Risk-free interest rate 1.39 % 1.81 % 1.51 % 1.86 % Expected term (in years) 6.02 5.31 6.06 5.45 Expected volatility 64.70 % 46.05 % 63.11 % 47.96 % Dividend yield - - - -
Summary of Restricted Stock Unit Activity	A summary of the RSU activity during the six months ended July 31, 2017 is presented below: Shares Weighted average grant date fair value per share Outstanding January 31, 2017 285,835 $ 30.60 Awarded 2,193,088 $ 19.41 Released - - Forfeited (42,928 ) $ 29.45 Outstanding July 31, 2017 2,435,995 $ 20.55
Schedule of Total Stock-Based Compensation Expense Recognized	Total stock-based compensation expense recognized for stock award in the consolidated statements of operations is as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Stock-based compensation: Cost of product revenue 67 690 129 761 Cost of support and maintenance revenue 96 538 172 653 Research and development 1,384 8,380 2,860 9,656 Sales and marketing 1,027 4,638 2,250 5,682 General and administrative 1,069 8,207 2,030 9,166 Total stock-based compensation expense 3,643 22,453 7,441 25,918 Total stock-based compensation expense recognized for stock awards in the consolidated statements of operations by type of awards is as follows (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Stock-based compensation: Stock options (1) 3,643 9,865 7,441 13,330 RSUs - 12,398 - 12,398 ESPP - 190 - 190 Total stock-based compensation expense 3,643 22,453 7,441 25,918 (1) In May 2017, the Company repriced each outstanding and unexercised stock option held by current service providers with an exercise price in excess of $13.68 per share (each, an "Eligible Option"), to a new exercise price of $13.68 per share, which is no less than the fair market value of the Company's common stock as determined by the Company's compensation committee on the date of repricing. Eligible Options covering 3,291,783 shares of the Company's common stock with a weighted average exercise price of $24.31 were repriced. Additional stock-based compensation expense related to this repricing is $7.3 million, of which $2.6 million was recognized immediately on the date of repricing for Eligible Options that have vested.
2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Schedule of Black-Scholes Option-pricing Model to Determine Fair Value of Shares Purchased under ESPP with Weighted Average Assumptions on Date of Grant	The Company uses the Black-Scholes option-pricing model to determine the fair value of shares purchased under the ESPP with the following weighted average assumptions on the date of the grant: Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Risk-free interest rate n/a 1.24 % n/a 1.24 % Expected term (in years) n/a 1.44 n/a 1.44 Expected volatility n/a 43.00 % n/a 43.00 % Dividend yield n/a - n/a -
2008 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Shares Available for Grant under Stock Plans	The following is a summary of shares available for grant under the Company’s stock plans for the year ended January 31, 2017 and the six months ended July 31, 2017: Outstanding—January 31, 2016 156,417 Authorized 1,405,316 Options and RSUs granted (1,240,032 ) Options and RSUs canceled 738,891 Outstanding—January 31, 2017 1,060,592 Authorized 7,024,194 Options and RSUs granted (6,957,545 ) Options and RSUs canceled 3,462,345 Outstanding—July 31, 2017 4,589,586
Summary of Stock Option Activity	The following is a summary of stock option activity under the 2008 Plan for the year ended January 31, 2017 and for the six months ended July 31, 2017: Options Outstanding Number of shares underlying outstanding options Weighted- average exercise price Weighted- average remaining contractual term Aggregate Intrinsic Value (in years) (in thousands) Outstanding—January 31, 2016 4,421,035 $ 16.34 8.2 $ 59,882 Options granted 920,147 $ 30.25 Options exercised (168,380 ) $ 13.63 Options canceled (704,841 ) $ 19.35 Outstanding—January 31, 2017 4,467,961 $ 18.83 7.5 $ 60,756 Options granted 1,473,046 $ 17.58 Options exercised (720,985 ) $ 9.53 Options canceled (162,495 ) $ 21.76 Outstanding—July 31, 2017 5,057,527 $ 12.78 8.0 $ 891 Vested and exercisable January 31, 2017 2,380,167 $ 13.55 6.8 $ 44,719 July 31, 2017 2,737,763 $ 12.03 7.4 $ 891 Vested and Expected to Vest January 31, 2017 (1) 4,174,361 $ 18.54 7.5 $ 57,552 July 31, 2017 5,057,527 $ 12.78 8.0 $ 891 (1) The expected to vest options are a result of applying the forfeiture rate assumptions to unvested options outstanding.

Net Loss per Share Attributab28

Net Loss per Share Attributable to Common Stockholders (Tables)	6 Months Ended
	Jul. 31, 2017
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Net Loss Per Share	The computation of basic and diluted net loss per share is as follows (in thousands, except share and per share data): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 Numerator: Net loss $ (25,672 ) $ (51,667 ) $ (56,483 ) $ (82,347 ) Deemed dividend to Series E and E-1 Convertible Preferred Stock - - - (6,588 ) Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock - 26,336 - 26,336 Net loss attributable to common stockholders $ (25,672 ) $ (25,331 ) $ (56,483 ) $ (62,599 ) Denominator: Weighted-average common shares outstanding 3,498,767 12,405,014 3,487,074 8,095,084 Weighted-average unvested common shares subject to repurchase (89,644 ) (61,184 ) (89,705 ) (49,666 ) Weighted-average shares—basic and diluted 3,409,123 12,343,830 3,397,369 8,045,418 Net loss per share attributable to common stockholders— basic and diluted $ (7.53 ) $ (2.05 ) $ (16.63 ) $ (7.78 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The potential absolute shares of common stock that were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive are as follows: As of July 31, 2016 2017 (in shares) Convertible preferred stock (on an if-converted basis) 10,610,966 - Stock options and RSUs 4,326,500 7,493,522 Early exercised stock options 84,008 57,461 Convertible preferred stock warrants 40,250 - Common stock warrants 25,000 1,897,562 Total 15,086,724 9,448,545

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jul. 31, 2017
Segment Reporting [Abstract]
Schedule of Revenue by Geographic Area	The following table sets forth revenue by geographic area by customer location (in thousands): Three Months Ended July 31, Six Months Ended July 31, 2016 2017 2016 2017 United States $ 18,868 $ 25,934 $ 33,453 $ 48,597 EMEA 4,332 5,406 8,097 9,138 Rest of the World 4,356 3,526 8,882 7,486 Total revenue $ 27,556 $ 34,866 $ 50,432 $ 65,221

Business Overview - Additional

Business Overview - Additional Information (Details) - USD ($)	Aug. 01, 2017	Jul. 31, 2017	Jun. 30, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Proceeds from initial public offering, net of underwriting discounts and commissions						$ 55,804,000	$ 0
Conversion of convertible preferred stock			7,382,007
Net loss				$ 51,667,000	$ 25,672,000	82,347,000	$ 56,483,000	$ 105,800,000	$ 101,000,000	$ 69,700,000
Gross proceeds related to sale of convertible preferred stock								$ 124,600,000
Line of credit facility, outstanding borrowings		$ 50,000,000		50,000,000		50,000,000
Revolving Credit Facility and Term Loan
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Line of credit facility, outstanding borrowings		$ 69,000,000		$ 69,000,000		$ 69,000,000
Common Stock | IPO
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares issued		8,572,000
Shares price		$ 7		$ 7		$ 7
Proceeds from initial public offering, net of underwriting discounts and commissions		$ 55,800,000
Underwriting discounts and commissions		$ 4,200,000
Conversion of convertible preferred stock		17,992,973				17,992,973
Common Stock | Over-allotment Option | Subsequent Event
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of shares issued	1,000,000
Shares price	$ 7
Proceeds from initial public offering, net of underwriting discounts and commissions	$ 6,500,000
Underwriting discounts and commissions	$ 500,000

Basis of Presentation and Sum31

Basis of Presentation and Summary of Significant Accounting Policies - Schedules of Concentration of Revenue and Accounts Receivable (Details) - Customer Concentration Risk	Jul. 31, 2017	Jan. 31, 2017	Jul. 31, 2017	Jul. 31, 2017
Revenue | Partner A
Accounting Policies [Line Items]
Concentration risk percentage			24.00%	22.00%
Revenue | Partner B
Accounting Policies [Line Items]
Concentration risk percentage			19.00%	10.00%
Accounts Receivable | Partner A
Accounting Policies [Line Items]
Concentration risk percentage	29.00%	16.00%
Accounts Receivable | Partner B
Accounting Policies [Line Items]
Concentration risk percentage	12.00%

Basis of Presentation and Sum32

Basis of Presentation and Summary of Significant Accounting Policies - Schedules of Concentration of Revenue and Accounts Receivable (Parenthetical) (Details) - Customer Concentration Risk	Jul. 31, 2017	Jan. 31, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenue | Partner A
Accounting Policies [Line Items]
Concentration risk percentage			24.00%		22.00%
Revenue | Partner A | Maximum
Accounting Policies [Line Items]
Concentration risk percentage				10.00%		10.00%
Revenue | Partner B
Accounting Policies [Line Items]
Concentration risk percentage			19.00%		10.00%
Revenue | Partner B | Maximum
Accounting Policies [Line Items]
Concentration risk percentage				10.00%		10.00%
Accounts Receivable | Partner A
Accounting Policies [Line Items]
Concentration risk percentage	29.00%	16.00%
Accounts Receivable | Partner B
Accounting Policies [Line Items]
Concentration risk percentage	12.00%
Accounts Receivable | Partner B | Maximum
Accounting Policies [Line Items]
Concentration risk percentage		10.00%

Basis of Presentation and Sum33

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	Jul. 31, 2017USD ($)	Jan. 31, 2017USD ($)	Jul. 31, 2017USD ($)	Jul. 31, 2016USD ($)	Jul. 31, 2017USD ($)Contract	Jul. 31, 2016USD ($)
Accounting Policies [Line Items]
Number of independent contract manufacturer | Contract					1
Income tax effect of currency translation adjustments related to foreign subsidiaries					$ 0
Allowance for doubtful accounts	$ 0	$ 100,000	$ 0		0
Allowance for returns	400,000	300,000
Inventory writedowns			500,000	$ 400,000	$ 900,000	$ 600,000
Warranty for hardware components					1 year
Warranty on software products					90 days
Warranty reserve	0		0		$ 0
Capitalized computer software, development costs	$ 0	$ 0	0		0
Advertising costs			900,000	200,000	$ 1,900,000	400,000
Employee is required to provide service period					4 years
Minimum
Accounting Policies [Line Items]
Estimated useful lives					24 months
Support and maintenance contracts, period					1 year
Maximum
Accounting Policies [Line Items]
Estimated useful lives					60 months
Support and maintenance contracts, period					5 years
Maximum | Sales Demonstration Equipment
Accounting Policies [Line Items]
Estimated useful lives					24 months
Maximum | Leasehold Improvements
Accounting Policies [Line Items]
Estimated useful lives					8 years
Cost of Product Revenue
Accounting Policies [Line Items]
Inventory writedowns			100,000	0	$ 200,000	0
Cost of Support and Maintenance Revenue
Accounting Policies [Line Items]
Inventory writedowns			$ 400,000	$ 400,000	$ 700,000	$ 600,000

Basis of Presentation and Sum34

Basis of Presentation and Summary of Significant Accounting Policies - Summary of Inventories by Major Category (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 229	$ 264
Finished goods	5,951	6,245
Inventories, net	$ 6,180	$ 6,509

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Short-term investments:
Total short-term investments	$ 7,926	$ 0
Recurring
Cash equivalents:
Total cash equivalents	48,632	31,468
Total assets measured at fair value	56,558	31,468
Convertible preferred warrants:
Total convertible preferred stock warrants		568
Total liabilities measured at fair value		568
Short-term investments:
Total short-term investments	7,926
Recurring | Corporate Debt Securities
Cash equivalents:
Total cash equivalents	11,954
Short-term investments:
Total short-term investments	5,931
Recurring | Series E Convertible Preferred Stock Warrants
Convertible preferred warrants:
Total convertible preferred stock warrants		568
Recurring | Money Market Funds
Cash equivalents:
Total cash equivalents	36,678	31,468
Recurring | U.S. Government and Agency Securities
Short-term investments:
Total short-term investments	1,995
Recurring | Level 1
Cash equivalents:
Total cash equivalents	36,678	31,468
Total assets measured at fair value	36,678	31,468
Recurring | Level 1 | Money Market Funds
Cash equivalents:
Total cash equivalents	36,678	31,468
Recurring | Level 2
Cash equivalents:
Total cash equivalents	11,954
Total assets measured at fair value	19,880
Short-term investments:
Total short-term investments	7,926
Recurring | Level 2 | Corporate Debt Securities
Cash equivalents:
Total cash equivalents	11,954
Short-term investments:
Total short-term investments	5,931
Recurring | Level 2 | U.S. Government and Agency Securities
Short-term investments:
Total short-term investments	$ 1,995
Recurring | Level 3
Convertible preferred warrants:
Total convertible preferred stock warrants		568
Total liabilities measured at fair value		568
Recurring | Level 3 | Series E Convertible Preferred Stock Warrants
Convertible preferred warrants:
Total convertible preferred stock warrants		$ 568

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in Fair Value of Convertible Preferred Stock Warrant Liability (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Fair Value Disclosures [Abstract]
Convertible preferred stock warrant liability—beginning balance	$ 568	$ 532
Change in fair value	(470)	36
Issuance of convertible preferred stock warrants	277
Reclassification of convertible preferred stock warrant liability to additional paid in capital	$ (375)
Convertible preferred stock warrant liability—ending balance		$ 568

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Condensed Balance Sheet Statements Captions [Line Items]
Short-term investments	$ 7,926		$ 7,926		$ 0
Other than temporary impairment on investments			0
Depreciation and amortization	1,700	$ 2,500	3,605	$ 4,799
Sales Demonstration Equipment
Condensed Balance Sheet Statements Captions [Line Items]
Depreciation expense	$ 300	$ 900	$ 700	$ 1,700

Balance Sheet Components - Summ

Balance Sheet Components - Summary of Fair Value of Available for Sale Investments (Details) $ in Thousands	Jul. 31, 2017USD ($)
Balance Sheet Components Disclosure [Abstract]
Due within one year, carrying amount	$ 7,926
Due within one year, fair value	7,926
Total, carrying amount	7,926
Total, fair value	$ 7,926

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Property Plant And Equipment [Line Items]
Total property and equipment	$ 35,460	$ 32,573
Less accumulated depreciation and amortization	(25,460)	(22,163)
Total property and equipment, net	10,000	10,410
Computer Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	19,508	17,431
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment	5,944	5,941
Sales Demonstration Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	6,098	5,903
Beta Equipment
Property Plant And Equipment [Line Items]
Total property and equipment	1,516	1,060
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment	1,657	1,550
Software
Property Plant And Equipment [Line Items]
Total property and equipment	660	649
Construction in Progress
Property Plant And Equipment [Line Items]
Total property and equipment	$ 77	$ 39

Balance Sheet Components - Sc40

Balance Sheet Components - Schedule of Accrued and Other Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Balance Sheet Components Disclosure [Abstract]
Accrued sales and use taxes payable	$ 1,830	$ 1,697
Accrued sales commissions	2,325	4,706
Accrued bonus	2,416	2,427
Accrued vacation	4,018	3,561
Other accruals	9,136	8,277
Total accrued and other current liabilities	$ 19,725	$ 20,668

Debt Obligations - Summary of D

Debt Obligations - Summary of Debt Obligations, Net of Debt Discount and Deferred Financing Costs (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 68,502	$ 48,914
Less current portion of debt	(18,962)	0
Long-term debt	49,540	48,914
Revolving Line of Credit
Debt Instrument [Line Items]
Total debt	18,962	13,962
Term Loan
Debt Instrument [Line Items]
Total debt	$ 49,540	$ 34,952

Debt Obligations - Additional I

Debt Obligations - Additional Information (Details) - USD ($)	Jul. 31, 2017	Jun. 30, 2017	May 31, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 60,000,000			$ 60,000,000		$ 60,000,000
Line of credit facility, outstanding borrowings	50,000,000			50,000,000		50,000,000
Line of credit facility with extended maturity date	$ 30,000,000			$ 30,000,000		$ 30,000,000
Line of credit facility, extended maturity month and year						2020-08
Interest rate, percentage	1.50%			1.50%		1.50%
Credit facility covenants compliance						As of January 31, 2017 and July 31, 2017, the Company was in compliance with all of the covenants contained in its credit facility with SVB.
Amortization of credit facility fees and debt issuance cost to interest expense				$ 100,000	$ 100,000	$ 100,000	$ 200,000
Credit facility fee balance	$ 0			0		0		$ 0
Debt issuance cost and discounts balance	500,000			500,000		500,000		0
Accreted balloon payment balance	$ 2,100,000			$ 2,100,000		$ 2,100,000		$ 1,400,000
Common Stock | IPO
Debt Instrument [Line Items]
Shares price	$ 7			$ 7		$ 7
Note Purchase Agreement
Debt Instrument [Line Items]
Notes issued and sold	$ 0
Note Purchase Agreement | Convertible Promissory Notes
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity			$ 25,000,000
Interest rate, percentage		8.00%
Required days of written notice			30 days
Notes expiry date						Dec. 31, 2019
Maturity period		18 months
Conversion of amount outstanding start date		Dec. 1, 2019
Period preceding conversion		30 days
Note Purchase Agreement | Convertible Promissory Notes | Common Stock | IPO
Debt Instrument [Line Items]
Shares price		$ 7
Minimum
Debt Instrument [Line Items]
Amount to be paid on or before the maturity date						$ 20,000,000
9% Line of credit facility due in February 2019
Debt Instrument [Line Items]
Amount outstanding	$ 15,000,000			$ 15,000,000		$ 15,000,000
Credit facility, bears interest rate	9.00%			9.00%		9.00%
Line of credit facility, maturity month and year						2019-02
11.25% Line of credit facility due in February 2019
Debt Instrument [Line Items]
Amount outstanding	$ 35,000,000			$ 35,000,000		$ 35,000,000
Credit facility, bears interest rate	11.25%			11.25%		11.25%
Line of credit facility, maturity month and year						2019-02
Revolving Line of Credit | SVB Credit Facility
Debt Instrument [Line Items]
Line of credit facility maximum borrowing capacity	$ 20,000,000			$ 20,000,000		$ 20,000,000
Line of credit facility, outstanding borrowings	$ 19,000,000			$ 19,000,000		$ 19,000,000
Line of credit facility expiration period						2018-05
Line of credit facility, weighted average interest rate	4.84%			4.84%		4.84%

Debt Obligations - Scheduled Pr

Debt Obligations - Scheduled Principal Payments on Outstanding Borrowings (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Debt Instruments [Abstract]
Fiscal 2,019	$ 18,962	$ 48,962
Fiscal 2,020	50,000
Total	68,962	48,962
Less debt discount	(460)	(48)
Less current portion	(18,962)	0
Non-current portion	$ 49,540	$ 48,914

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Noncancelable operating lease expiration, start year			2,018
Noncancelable operating lease expiration, end year			2,023
Noncancelable capital lease expiration, start year			2,018
Noncancelable capital lease expiration, end year			2,023
Operating leases, rent expense	$ 1.6	$ 1.1	$ 3.1	$ 2.3
Purchase commitment with contract manufacturer	$ 24.4		$ 24.4		$ 13.5

Commitments and Contingencies45

Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Noncancelable Operating Leases (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
2,018		$ 7,121
Remaining Fiscal 2018	$ 3,678
2,019	7,068	7,019
2,020	7,135	7,127
2,021	7,021	7,021
2,022	7,068	7,068
Thereafter	3,984	3,984
Committed gross lease payments	35,954	39,340
Less proceeds from sublease rental	(3,655)	(4,244)
Net operating lease obligation	$ 32,299	$ 35,096

Commitments and Contingencies46

Commitments and Contingencies - Schedule of Future Minimum Lease Payments under Noncancelable Capital Leases (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Remaining fiscal 2018	$ 67
2,018		$ 216
2,019	96	96
2,020	77	77
Total	240	389
Interest	(12)	(20)
Total	$ 228	$ 369

Convertible Preferred Stock - S

Convertible Preferred Stock - Schedule of Conversion of Convertible Preferred Stock into Common Stock (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Temporary Equity [Line Items]
Number of shares authorized	10,679,599	10,651,216
Shares issued	10,610,966	10,610,966
Shares outstanding	10,610,966	10,610,966
Liquidation preference	$ 259,254	$ 259,254
Series A Convertible Preferred Stock
Temporary Equity [Line Items]
Date issued		2008-08
Number of shares authorized		1,533,329
Shares issued		1,533,329
Shares outstanding		1,533,329
Liquidation preference		$ 4,600
Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Date issued		2009-07
Number of shares authorized		2,119,997
Shares issued		2,119,997
Shares outstanding		2,119,997
Liquidation preference		$ 12,000
Series C Convertible Preferred Stock
Temporary Equity [Line Items]
Date issued		2011-05
Number of shares authorized		1,312,311
Shares issued		1,312,311
Shares outstanding		1,312,311
Liquidation preference		$ 18,100
Series D Convertible Preferred Stock
Temporary Equity [Line Items]
Date issued		2012-07
Number of shares authorized		1,092,149
Shares issued		1,092,149
Shares outstanding		1,092,149
Liquidation preference		$ 25,000
Series E Convertible Preferred Stock
Temporary Equity [Line Items]
Date issued		2014-01
Number of shares authorized		1,681,912
Shares issued		1,641,662
Shares outstanding		1,641,662
Liquidation preference		$ 71,377
Series E-1 Convertible Preferred Stock
Temporary Equity [Line Items]
Date issued		2014-01
Number of shares authorized		83,333
Shares issued		83,333
Shares outstanding		83,333
Liquidation preference		$ 3,623
Series F Convertible Preferred Stock
Temporary Equity [Line Items]
Date issued	2017-02	2015-07
Number of shares authorized	28,383	2,828,185
Shares issued		2,828,185
Shares outstanding		2,828,185
Liquidation preference		$ 124,554

Convertible Preferred Stock - A

Convertible Preferred Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Apr. 30, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Temporary Equity [Line Items]
Series E and E-1 Convertible Preferred Stock purchase price			$ 43.47828
Series E and E-1 Convertible Preferred Stock threshold of stock price trigger			$ 47.826108
Deemed dividend to Series E and E-1 Convertible Preferred Stock			$ 6,600	$ 0	$ 0	$ (6,588)	$ 0
Conversion of convertible preferred stock		7,382,007
Number of common stock purchase		1,666,665
Warrant exercisable period		10 years
Warrant exercised price		$ 16.44
Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock				26,336	$ 0	26,336	0
Common stock warrants issued to Series E-2 and F-2 Holders						14,641	$ 0
Additional loan drawn	$ 50,000			50,000		50,000
New Facility Agreement
Temporary Equity [Line Items]
Additional loan drawn	$ 10,000			$ 10,000		$ 10,000
Common Stock | IPO
Temporary Equity [Line Items]
Conversion of convertible preferred stock	17,992,973					17,992,973
Convertible Preferred Stock Warrants
Temporary Equity [Line Items]
Conversion of convertible preferred stock						68,633
Common Stock Warrants
Temporary Equity [Line Items]
Conversion of stock	205,897			205,897		205,897
Warrants exercisable upon additional loan drawn	34,058			34,058		34,058

Common Stock - Summary of Reser

Common Stock - Summary of Reserved Shares of Authorized but Unissued Common Stock (Details) - shares	Jul. 31, 2017	Jan. 31, 2017
Class Of Stock [Line Items]
Shares reserved for future issuance	13,980,670	16,490,604
Convertible Preferred Stock
Class Of Stock [Line Items]
Shares reserved for future issuance		10,610,966
Convertible Preferred Stock Warrants
Class Of Stock [Line Items]
Shares reserved for future issuance		40,250
Options and RSUs Outstanding and Shares Available For Grant
Class Of Stock [Line Items]
Shares reserved for future issuance	12,083,108	5,814,388
Common Stock Warrants
Class Of Stock [Line Items]
Shares reserved for future issuance	1,897,562	25,000

Common Stock - Additional Infor

Common Stock - Additional Information (Details)	1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)$ / sharesshares	May 31, 2017USD ($)$ / sharesshares	Jul. 31, 2013USD ($)$ / sharesshares	Jul. 31, 2017USD ($)$ / sharesshares	Jul. 31, 2016USD ($)$ / shares	Jul. 31, 2017USD ($)$ / sharesshares	Jul. 31, 2016USD ($)$ / shares	Jan. 31, 2014USD ($)Employee	Jan. 31, 2008	Jan. 31, 2017USD ($)shares
Class Of Stock [Line Items]
Shares reserved for future issuance				13,980,670		13,980,670				16,490,604
Common stock subject to repurchase				57,461		57,461				49,234
Common stock subject to repurchase, aggregate purchase price | $				$ 500,000		$ 500,000				$ 500,000
Number of executive employees exercised stock options early | Employee								1
Number of non-executive employees exercised stock options early | Employee								1
Proceeds from exercise of stock options | $						470,000	$ 696,000
Additional stock-based compensation | $						25,918,000	7,441,000
Aggregate intrinsic value of stock options exercised | $				$ 0	$ 300,000	$ 600,000	$ 900,000
Weighted-average grant date fair value, Options granted | $ / shares				$ 5.92	$ 18.03	$ 8.28	$ 17.52
Total grant date fair value, Options vested | $				$ 8,800,000	$ 2,500,000	$ 13,600,000	$ 5,500,000
Unrecognized stock-based compensation expense | $				73,900,000		$ 73,900,000
Weighted average period over which unrecognized compensation is expected to be recognized						2 years 2 months 12 days
Number of common stock purchase	1,666,665
Warrant exercisable period	10 years
Warrant exercised price | $ / shares	$ 16.44
Conversion of convertible preferred stock	7,382,007
Additional loan drawn | $				$ 50,000,000		$ 50,000,000
Convertible Preferred Stock Warrants
Class Of Stock [Line Items]
Conversion of convertible preferred stock						68,633
Common Stock Warrants
Class Of Stock [Line Items]
Shares reserved for future issuance				1,897,562		1,897,562				25,000
Conversion of stock				205,897		205,897
Warrants exercisable upon additional loan drawn				34,058		34,058
Loan and Security Agreement
Class Of Stock [Line Items]
Number of common stock purchase						4,167
Fair value of warrant | $						$ 27,000
Warrant to purchase additional common stock			20,833
Exercise price of warrant | $ / shares			$ 7.80
Warrant expiration date						May 31, 2023
Issuance of additional common stock warrant | $			$ 100,000
Unamortized debt discount written off | $			$ 100,000
Full-recourse Promissory Note | Executive and Non-executive Employee
Class Of Stock [Line Items]
Debt instrument principal amount | $								$ 2,200,000
Full-recourse Promissory Note | Executive Employee
Class Of Stock [Line Items]
Additional options of fully vested and exercisable options issued		88,520
Proceeds from exercise of stock options | $	$ 1,000,000
Common stock repurchased	88,520
Common stock repurchased price per share | $ / shares	$ 13.68
Additional stock-based compensation | $				$ 500,000
Partial-recourse Promissory Note | Executive Employee
Class Of Stock [Line Items]
Debt instrument principal amount | $								$ 6,600,000
Debt instrument interest rate percentage								1.92%
Additional options of fully vested and exercisable options issued		501,104
Proceeds from exercise of stock options | $	$ 6,900,000
Common stock repurchased	501,104
Common stock repurchased price per share | $ / shares	$ 13.68
Additional stock-based compensation | $	$ 0
New Facility Agreement
Class Of Stock [Line Items]
Additional loan drawn | $				$ 10,000,000		$ 10,000,000
Minimum | Full-recourse Promissory Note | Executive and Non-executive Employee
Class Of Stock [Line Items]
Debt instrument interest rate percentage								1.62%
Maximum
Class Of Stock [Line Items]
Number of common stock purchase	1,666,665
Maximum | Full-recourse Promissory Note | Executive and Non-executive Employee
Class Of Stock [Line Items]
Debt instrument interest rate percentage								1.64%
Performance RSUs
Class Of Stock [Line Items]
Share-based compensation arrangement by share-based payment award, vesting period						2 years
2017 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares reserved for future issuance		907,000
Exercise price as percentage of fair market value of common stock		85.00%
Percentage of outstanding common stock		1.00%
Maximum percentage of common stock eligible to purchase through payroll deductions for employees		15.00%
Maximum number of shares available for participant to purchase during period | $		$ 25,000,000
Maximum number of shares available for participant to purchase during period		2,000
Offering period		24 months
First offering period start date		Jun. 29, 2017
2017 Employee Stock Purchase Plan | IPO
Class Of Stock [Line Items]
Share price | $ / shares		$ 7
2017 Employee Stock Purchase Plan | Maximum
Class Of Stock [Line Items]
Number of shares increased annually to common stock shares reserve for issuance		907,000
2008 Stock Plan
Class Of Stock [Line Items]
Shares reserved for future issuance										7,688,078
Additional options of fully vested and exercisable options issued				2,737,763		2,737,763				2,380,167
2008 Stock Plan | Minimum
Class Of Stock [Line Items]
Exercise price as percentage of fair market value of common stock									100.00%
2008 Stock Plan | ISOs
Class Of Stock [Line Items]
Service period									1 year
Share-based compensation arrangement by share-based payment award, vesting period									36 months
Expiration period from date of grant									10 years
2008 Stock Plan | ISOs | Completion of One Year of Service
Class Of Stock [Line Items]
Vesting rate									25.00%
2008 Stock Plan | NSOs
Class Of Stock [Line Items]
Expiration period from date of grant									10 years
2017 Equity Incentive Plan
Class Of Stock [Line Items]
Shares reserved for future issuance		4,537,000
2017 Equity Incentive Plan | Minimum
Class Of Stock [Line Items]
Exercise price as percentage of fair market value of common stock		100.00%
2017 Equity Incentive Plan | ISOs
Class Of Stock [Line Items]
Service period		1 year
Share-based compensation arrangement by share-based payment award, vesting period		36 months
Expiration period from date of grant		10 years
2017 Equity Incentive Plan | ISOs | Completion of One Year of Service
Class Of Stock [Line Items]
Vesting rate		25.00%
2017 Equity Incentive Plan | NSOs
Class Of Stock [Line Items]
Expiration period from date of grant		10 years

Common Stock - Summary of Share

Common Stock - Summary of Shares Available for Grant under Stock Plans (Details) - shares	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017
Equity [Abstract]
Outstanding—January 31, 2016	1,060,592	156,417
Authorized	7,024,194	1,405,316
Options and RSUs granted	(6,957,545)	(1,240,032)
Options and RSUs canceled	3,462,345	738,891
Outstanding—January 31, 2017	4,589,586	1,060,592

Common Stock - Summary of Stock

Common Stock - Summary of Stock Option Activity (Details) - 2008 Plan - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2017	Jan. 31, 2017		Jan. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares underlying outstanding options, beginning balance	4,467,961	4,421,035
Number of shares underlying outstanding, Options granted	1,473,046	920,147
Number of shares underlying outstanding, Options exercised	(720,985)	(168,380)
Number of shares underlying outstanding, Options canceled	(162,495)	(704,841)
Number of shares underlying outstanding options, ending balance	5,057,527	4,467,961		4,421,035
Number of shares underlying, Options vested and exercisable	2,737,763	2,380,167
Number of shares underlying, Options vested and expected to vest	5,057,527	4,174,361	[1]
Weighted average exercise price, Outstanding beginning balance	$ 18.83	$ 16.34
Weighted average exercise price, Options granted	17.58	30.25
Weighted average exercise price, Options exercised	9.53	13.63
Weighted average exercise price, Options canceled	21.76	19.35
Weighted average exercise price, Outstanding ending balance	12.78	18.83		$ 16.34
Weighted average exercise price, Options vested and exercisable	12.03	13.55
Weighted average exercise price, Vested and Expected to Vest	$ 12.78	$ 18.54	[1]
Weighted-average remaining contractual term, Options Outstanding	8 years	7 years 6 months		8 years 2 months 12 days
Weighted-average remaining contractual term, Vested and exercisable	7 years 4 months 24 days	6 years 9 months 18 days
Weighted-average remaining contractual term, Vested and Expected to Vest	8 years	7 years 6 months	[1]
Aggregate Intrinsic Value, Options Outstanding	$ 891	$ 60,756		$ 59,882
Aggregate Intrinsic Value, Vested and exercisable	891	44,719
Aggregate Intrinsic Value, Vested and Expected to Vest	$ 891	$ 57,552	[1]
[1]	The expected to vest options are a result of applying the forfeiture rate assumptions to unvested options outstanding.

Common Stock - Schedule of Weig

Common Stock - Schedule of Weighted-Average Assumptions Used to Estimate Fair Value of Stock Options Granted (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	1.81%	1.39%	1.86%	1.51%
Expected term (in years)	5 years 3 months 22 days	6 years 7 days	5 years 5 months 12 days	6 years 22 days
Expected volatility	46.05%	64.70%	47.96%	63.11%
Dividend yield	0.00%	0.00%	0.00%	0.00%

Common Stock - Summary of Restr

Common Stock - Summary of Restricted Stock Unit Activity (Details) - RSUs	6 Months Ended
	Jul. 31, 2017$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares outstanding, beginning balance | shares	285,835
Shares, Awarded | shares	2,193,088
Shares, Released | shares	0
Shares, Forfeited | shares	(42,928)
Shares outstanding, ending balance | shares	2,435,995
Weighted average grant date fair value per share, Outstanding beginning balance | $ / shares	$ 30.60
Weighted average grant date fair value per share, Awarded | $ / shares	19.41
Weighted average grant date fair value per share, Released | $ / shares	0
Weighted average grant date fair value per share, Forfeited | $ / shares	29.45
Weighted average grant date fair value per share, Outstanding ending balance | $ / shares	$ 20.55

Common Stock - Schedule of Blac

Common Stock - Schedule of Black-Scholes Option-pricing Model to Determine Fair Value of Shares Purchased under ESPP with Weighted Average Assumptions on Date of Grant (Details)	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	1.81%	1.39%	1.86%	1.51%
Expected term (in years)	5 years 3 months 22 days	6 years 7 days	5 years 5 months 12 days	6 years 22 days
Expected volatility	46.05%	64.70%	47.96%	63.11%
Dividend yield	0.00%	0.00%	0.00%	0.00%
2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	1.24%	0.00%	1.24%	0.00%
Expected term (in years)	1 year 5 months 9 days		1 year 5 months 9 days
Expected volatility	43.00%	0.00%	43.00%	0.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%

Common Stock - Schedule of Tota

Common Stock - Schedule of Total Stock-Based Compensation Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Stock-based compensation:
Total stock-based compensation expense	$ 22,453	$ 3,643	$ 25,918	$ 7,441
Cost of Product Revenue
Stock-based compensation:
Total stock-based compensation expense	690	67	761	129
Cost of Support and Maintenance Revenue
Stock-based compensation:
Total stock-based compensation expense	538	96	653	172
Research and development
Stock-based compensation:
Total stock-based compensation expense	8,380	1,384	9,656	2,860
Sales and marketing
Stock-based compensation:
Total stock-based compensation expense	4,638	1,027	5,682	2,250
General and administrative
Stock-based compensation:
Total stock-based compensation expense	$ 8,207	$ 1,069	$ 9,166	$ 2,030

Common Stock - Schedule of To57

Common Stock - Schedule of Total Stock-Based Compensation Expense Recognized by Type of Award (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Stock-based compensation:
Total stock-based compensation expense	$ 22,453	$ 3,643	$ 25,918	$ 7,441
Stock Options
Stock-based compensation:
Total stock-based compensation expense	9,865	$ 3,643	13,330	$ 7,441
RSUs
Stock-based compensation:
Total stock-based compensation expense	12,398		12,398
ESPP
Stock-based compensation:
Total stock-based compensation expense	$ 190		$ 190

Common Stock - Schedule of To58

Common Stock - Schedule of Total Stock-Based Compensation Expense Recognized by Type of Award (Parenthetical) (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Apr. 30, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Additional stock-based compensation expense		$ 22,453,000	$ 3,643,000	$ 25,918,000	$ 7,441,000
Eligible Option
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Outstanding and unexercised stock option exercise price	$ 13.68
Eligible options shares of common stock repriced	3,291,783
Eligible options repriced common stock weighted average exercise price	$ 24.31
Additional stock-based compensation expense	$ 2,600	$ 7,300
Minimum
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Outstanding and unexercised stock option exercise price						$ 13.68

401(k) Plan - Additional Inform

401(k) Plan - Additional Information (Details) - USD ($)	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
Percentage of contributions under the saving plan, vested	100.00%
Defined benefit plan, contributions by plan eligible participants	$ 0	$ 0

Net Loss Per Share Attributab60

Net Loss Per Share Attributable to Common Stockholders - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Earnings Per Share [Abstract]
Net loss		$ (51,667)	$ (25,672)	$ (82,347)	$ (56,483)	$ (105,800)	$ (101,000)	$ (69,700)
Deemed dividend to Series E and E-1 Convertible Preferred Stock	$ 6,600	0	0	(6,588)	0
Impact of adjustment to Series E, E-1 and F Convertible Preferred Stock		26,336	0	26,336	0
Net loss attributable to common stockholders		$ (25,331)	$ (25,672)	$ (62,599)	$ (56,483)
Weighted-average common shares outstanding		12,405,014	3,498,767	8,095,084	3,487,074
Weighted-average unvested common shares subject to repurchase		(61,184)	(89,644)	(49,666)	(89,705)
Weighted-average shares used in computing net loss per share attributable to common stockholders—basic and diluted		12,343,830	3,409,123	8,045,418	3,397,369
Net loss per share attributable to common stockholders— basic and diluted		$ (2.05)	$ (7.53)	$ (7.78)	$ (16.63)

Net Loss Per Share Attributab61

Net Loss Per Share Attributable to Common Stockholders - Summary of Potential Absolute Shares Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares	6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	9,448,545	15,086,724
Convertible preferred stock (on an if-converted basis)
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	0	10,610,966
Stock Options and RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	7,493,522	4,326,500
Early Exercised Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	57,461	84,008
Convertible Preferred Stock Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	0	40,250
Common Stock Warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share	1,897,562	25,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 138	$ 153	$ 296	$ 351

Segment Information - Revenue b

Segment Information - Revenue by Geographic Area by Customer Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 34,866	$ 27,556	$ 65,221	$ 50,432
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	25,934	18,868	48,597	33,453
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	5,406	4,332	9,138	8,097
Rest of the World
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 3,526	$ 4,356	$ 7,486	$ 8,882

Segment Information - Additiona

Segment Information - Additional Information (Details) - USD ($) $ in Millions	Jul. 31, 2017	Jan. 31, 2017
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 9.8	$ 10.2

Related Party and Other Trans65

Related Party and Other Transactions - Additional Information (Details) $ in Thousands	1 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017USD ($)shares	Jul. 31, 2015USD ($)shares	Jul. 31, 2017USD ($)	Jul. 31, 2016USD ($)	Jan. 31, 2014USD ($)Employee	Jan. 31, 2017USD ($)
Related Party Transaction [Line Items]
Number of executive employees exercised stock options early | Employee					1
Number of non-executive employees exercised stock options early | Employee					1
Repayment of outstanding principal and interest balance			$ 470	$ 696
Series F Convertible Preferred Stock
Related Party Transaction [Line Items]
Preferred stock shares, issued | shares		11,353
Preferred stock shares, aggregate value		$ 500
Full-recourse Promissory Note [Member] | Executive and Non-executive Employee [Member]
Related Party Transaction [Line Items]
Debt instrument principal amount					$ 2,200
Employee notes receivable			$ 700			$ 1,500
Full-recourse Promissory Note [Member] | Executive Employee [Member]
Related Party Transaction [Line Items]
Repayment of outstanding principal and interest balance	$ 1,000
Common stock repurchased | shares	88,520
Full-recourse Promissory Note [Member] | Non-executive Employee [Member]
Related Party Transaction [Line Items]
Promissory note and accrued interest payable beginning date			2018-08
Full-recourse Promissory Note [Member] | Minimum | Executive and Non-executive Employee [Member]
Related Party Transaction [Line Items]
Debt instrument interest rate percentage					1.62%
Full-recourse Promissory Note [Member] | Maximum | Executive and Non-executive Employee [Member]
Related Party Transaction [Line Items]
Debt instrument interest rate percentage					1.64%
Promissory Note [Member] | Executive Employee [Member]
Related Party Transaction [Line Items]
Debt instrument principal amount					$ 6,600
Debt instrument interest rate percentage					1.92%
Repayment of outstanding principal and interest balance	$ 6,900
Common stock repurchased | shares	501,104

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Aug. 01, 2017	Jun. 29, 2017	Sep. 30, 2017	Jul. 31, 2017	Jul. 31, 2016
Subsequent Event [Line Items]
Description of underwriting agreement		On June 29, 2017, the Company entered into an underwriting agreement (the “Underwriting Agreement”) with Morgan Stanley & Co. LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated (the “Underwriters”), relating to the Company’s IPO.
Period granted for underwriting option		30 days
Proceeds from initial public offering, net of underwriting discounts and commissions				$ 55,804	$ 0
Subsequent Event | Employee Stock Option | 2017 Equity Incentive Plan
Subsequent Event [Line Items]
Share-based compensation arrangement by share-based payment award, options, grants in period			58,966
Share-based compensation arrangement by share-based payment award options grant date fair value			100,000
Subsequent Event | PSUs | 2017 Equity Incentive Plan
Subsequent Event [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options ,grants in period			3,662,534
Share-based compensation arrangement by share-based payment award equity instruments other than options grant date fair value			16,300,000
Over-allotment Option | Common Stock
Subsequent Event [Line Items]
Number of additional shares issued		1,285,800
Over-allotment Option | Common Stock | Subsequent Event
Subsequent Event [Line Items]
Number of shares issued	1,000,000
Shares price	$ 7
Proceeds from initial public offering, net of underwriting discounts and commissions	$ 6,500
Underwriting discounts and commissions	$ 500