Summary of Significant Accounting Policies	9 Months Ended
Oct. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). Therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related footnotes included in the Company’s final prospectus for its IPO dated as of October 18, 2017 and filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, on October 19, 2017. Interim Unaudited Condensed Consolidated Financial Statements The accompanying interim condensed consolidated balance sheets as of October 31, 2017, the interim condensed consolidated statements of operations and of comprehensive loss for the three and nine months ended October 31, 2016 and 2017, and the interim condensed consolidated statement of cash flows and the interim condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity (deficit) for the nine months ended October 31, 2017 are unaudited. The interim unaudited condensed consolidated financial statements have been prepared on a basis consistent with the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s financial position as of October 31, 2017, its results of operations and of comprehensive loss for the three and nine months ended October 31, 2017 and 2016, and its statement of cash flows for the nine months ended October 31, 2017 and 2016 and its statement of redeemable convertible preferred stock and stockholders’ equity (deficit) for the nine months ended October 31, 2017. The financial data and the other financial information disclosed in the notes to these condensed consolidated financial statements related to the three- and nine-month periods are also unaudited. The results of operations for the three and nine months ended October 31, 2017 are not necessarily indicative of the results to be expected for the fiscal year ending January 31, 2018 or for any other future year or interim period. Use of Estimates The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, revenue recognition, allowances for doubtful accounts, stock-based compensation, fair value of common stock and redeemable convertible preferred stock warrants prior to the IPO, legal contingencies, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, and accounting for income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events. Actual results could differ from those estimates. Emerging Growth Company Status As an “emerging growth company” (“EGC”), the Jump-start Our Business Start-ups Act (“JOBS Act”), allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make the Company’s common stock less attractive to investors. Significant Accounting Policies There have been no changes to the Company’s significant accounting policies described in the Company’s final prospectus for its IPO dated as of October 18, 2017 and filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, on October 19, 2017. Recently Adopted Accounting Pronouncements Stock-Based Compensation. Starting February 1, 2016, the Company elected to early adopt Accounting Standards Update (“ASU”) No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvement to Employee Share-based Payment Accounting, which would among other items, provide an accounting policy election to account for forfeitures as they occur, rather than to account for them based on an estimate of expected forfeitures and modifies financial statement presentation of excess tax benefits or deficiencies. The Company elected to account for forfeitures as they occur and therefore, stock-based compensation expense for the three and nine months ended October 31, 2017 and 2016 has been calculated based on actual forfeitures in the unaudited condensed consolidated statements of operations. The cumulative effect of this change increased the accumulated deficit and decreased additional paid-in capital as of February 1, 2016 by $1.5 million. In addition, the effect on the Company’s historical consolidated financial statements was limited to an immaterial cumulative-effect adjustment for previously unrecognized excess tax benefits as a deferred tax asset with an offset to opening accumulated deficit, which was fully offset by a valuation allowance. Consolidated Statements of Cash Flows. Starting February 1, 2016, the Company elected to early adopt ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments and ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. ASU No. 2016-15 eliminates the diversity in practice related to the classification of certain cash receipts and payments for debt prepayment or extinguishment costs, the maturing of a zero-coupon bond, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, distributions from certain equity method investees and beneficial interests obtained in a financial asset securitization. ASU No. 2016-18 requires that the statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted ASU No. 2016-15 and ASU No. 2016-18 using the retrospective transition method and adjusted the consolidated statements of cash flows in all comparative periods presented. New Accounting Pronouncements Not Yet Adopted Stock-Based Compensation. In May 2017, the Financial Accounting Standards Board (“FASB”), issued ASU 2017-09, Compensation—Stock Compensation (Topic 718). The amendments in the update provide guidance on types of changes to the terms or conditions of share-based payment awards, which would be required to apply modification accounting under Accounting Standards Codification (“ASC”) 718. The new guidance becomes effective for the Company for the fiscal year ending January 31, 2018, though early adoption is permitted. The Company is currently evaluating whether this standard will have a material impact on its consolidated financial statements. Goodwill Impairment. In January 2017, the FASB issued ASU 2017-04—Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard will simplify the measurement of goodwill by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for the Company for the fiscal year ending January 31, 2022, though early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements. Leases. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which modifies lease accounting for lessees to increase transparency and comparability by recording lease assets and liabilities for operating leases and disclosing key information about leasing arrangements. Depending on when the Company loses its EGC status, it may be required to adopt the new lease standard as early as its interim results for the period ending April 30, 2019, but no later than for its annual results for the fiscal year ending January 31, 2021, though early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements. Revenue Recognition. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which amends the existing accounting standard for revenue recognition. ASU 2014-09 is based on principles that govern the recognition of revenue at an amount to which an entity expects to be entitled when products are transferred to customers. Subsequently, the FASB has issued the following pronouncements related to ASU 2014-09: ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations; ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing; ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients; and ASU 2016-20, Technical Corrections and Improvements to Topic 606, which clarifies narrow aspects of ASC 606 or corrects unintended application of the guidance. The Company must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 with ASU 2014-09 (collectively, the “new revenue standard”). The Company plans to adopt the new revenue standard using the full retrospective transition method when it becomes effective for the Company. Depending on when the Company loses its EGC status, it may be required to adopt the new revenue standard as early as its annual results for the fiscal year ending January 31, 2019, but no later than for its annual results for the fiscal year ending January 31, 2020, though early adoption is permitted. While the Company continues to assess the potential impacts of the new revenue standard, the Company currently expects unearned subscription revenue to decline significantly upon adoption. Currently, as the Company’s subscription offerings include software term licenses and post-contract customer support for which the Company has not established vendor specific objective evidence (“VSOE”), the entire subscription fee is recognized ratably over the term of the contract. However, under the new revenue standard, the requirement for VSOE for undelivered elements is eliminated and, as a result, the Company is required to identify all deliverables in a contract and recognize revenue based on each deliverable separately. The Company currently expects that the portion related to the software term license deliverable will be recognized upon delivery. The Company is in the process of determining the revenue recognition impact for the other deliverables of each contract. The Company continues to evaluate the effect that the new revenue standard will have on its consolidated financial statements and related disclosures, and preliminary assessments are subject to change.

Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and accounts have been eliminated. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). Therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related footnotes included in the Company’s final prospectus for its IPO dated as of October 18, 2017 and filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, on October 19, 2017.

Interim Unaudited Condensed Consolidated Financial Statements

The accompanying interim condensed consolidated balance sheets as of October 31, 2017, the interim condensed consolidated statements of operations and of comprehensive loss for the three and nine months ended October 31, 2016 and 2017, and the interim condensed consolidated statement of cash flows and the interim condensed consolidated statement of redeemable convertible preferred stock and stockholders’ equity (deficit) for the nine months ended October 31, 2017 are unaudited. The interim unaudited condensed consolidated financial statements have been prepared on a basis consistent with the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary to state fairly the Company’s financial position as of October 31, 2017, its results of operations and of comprehensive loss for the three and nine months ended October 31, 2017 and 2016, and its statement of cash flows for the nine months ended October 31, 2017 and 2016 and its statement of redeemable convertible preferred stock and stockholders’ equity (deficit) for the nine months ended October 31, 2017. The financial data and the other financial information disclosed in the notes to these condensed consolidated financial statements related to the three- and nine-month periods are also unaudited. The results of operations for the three and nine months ended October 31, 2017 are not necessarily indicative of the results to be expected for the fiscal year ending January 31, 2018 or for any other future year or interim period.

Use of Estimates

The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Such estimates include, but are not limited to, revenue recognition, allowances for doubtful accounts, stock-based compensation, fair value of common stock and redeemable convertible preferred stock warrants prior to the IPO, legal contingencies, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, and accounting for income taxes. The Company bases these estimates on historical and anticipated results, trends and various other assumptions that it believes are reasonable under the circumstances, including assumptions as to future events. Actual results could differ from those estimates.

Emerging Growth Company Status

As an “emerging growth company” (“EGC”), the Jump-start Our Business Start-ups Act (“JOBS Act”), allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use this extended transition period under the JOBS Act. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make the Company’s common stock less attractive to investors.

Significant Accounting Policies

There have been no changes to the Company’s significant accounting policies described in the Company’s final prospectus for its IPO dated as of October 18, 2017 and filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act of 1933, as amended, on October 19, 2017.

Recently Adopted Accounting Pronouncements

Stock-Based Compensation. Starting February 1, 2016, the Company elected to early adopt Accounting Standards Update (“ASU”) No. 2016-09, Compensation—Stock Compensation (Topic 718): Improvement to Employee Share-based Payment Accounting, which would among other items, provide an accounting policy election to account for forfeitures as they occur, rather than to account for them based on an estimate of expected forfeitures and modifies financial statement presentation of excess tax benefits or deficiencies. The Company elected to account for forfeitures as they occur and therefore, stock-based compensation expense for the three and nine months ended October 31, 2017 and 2016 has been calculated based on actual forfeitures in the unaudited condensed consolidated statements of operations. The cumulative effect of this change increased the accumulated deficit and decreased additional paid-in capital as of February 1, 2016 by $1.5 million. In addition, the effect on the Company’s historical consolidated financial statements was limited to an immaterial cumulative-effect adjustment for previously unrecognized excess tax benefits as a deferred tax asset with an offset to opening accumulated deficit, which was fully offset by a valuation allowance.

Consolidated Statements of Cash Flows. Starting February 1, 2016, the Company elected to early adopt ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments and ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. ASU No. 2016-15 eliminates the diversity in practice related to the classification of certain cash receipts and payments for debt prepayment or extinguishment costs, the maturing of a zero-coupon bond, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, distributions from certain equity method investees and beneficial interests obtained in a financial asset securitization. ASU No. 2016-18 requires that the statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The Company adopted ASU No. 2016-15 and ASU No. 2016-18 using the retrospective transition method and adjusted the consolidated statements of cash flows in all comparative periods presented.

New Accounting Pronouncements Not Yet Adopted

Stock-Based Compensation. In May 2017, the Financial Accounting Standards Board (“FASB”), issued ASU 2017-09, Compensation—Stock Compensation (Topic 718). The amendments in the update provide guidance on types of changes to the terms or conditions of share-based payment awards, which would be required to apply modification accounting under Accounting Standards Codification (“ASC”) 718. The new guidance becomes effective for the Company for the fiscal year ending January 31, 2018, though early adoption is permitted. The Company is currently evaluating whether this standard will have a material impact on its consolidated financial statements.

Goodwill Impairment. In January 2017, the FASB issued ASU 2017-04—Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The new standard will simplify the measurement of goodwill by eliminating step two of the two-step impairment test. Step two measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. The new guidance requires an entity to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. Additionally, an entity should consider income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The new guidance becomes effective for the Company for the fiscal year ending January 31, 2022, though early adoption is permitted. The Company does not expect the adoption of the new accounting standard to have a material impact on its consolidated financial statements.

Leases. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), which modifies lease accounting for lessees to increase transparency and comparability by recording lease assets and liabilities for operating leases and disclosing key information about leasing arrangements. Depending on when the Company loses its EGC status, it may be required to adopt the new lease standard as early as its interim results for the period ending April 30, 2019, but no later than for its annual results for the fiscal year ending January 31, 2021, though early adoption is permitted. The Company is currently evaluating adoption methods and whether this standard will have a material impact on its consolidated financial statements.

Revenue Recognition. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which amends the existing accounting standard for revenue recognition. ASU 2014-09 is based on principles that govern the recognition of revenue at an amount to which an entity expects to be entitled when products are transferred to customers. Subsequently, the FASB has issued the following pronouncements related to ASU 2014-09: ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations; ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing; ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients; and ASU 2016-20, Technical Corrections and Improvements to Topic 606, which clarifies narrow aspects of ASC 606 or corrects unintended application of the guidance. The Company must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12, and ASU 2016-20 with ASU 2014-09 (collectively, the “new revenue standard”).

The Company plans to adopt the new revenue standard using the full retrospective transition method when it becomes effective for the Company. Depending on when the Company loses its EGC status, it may be required to adopt the new revenue standard as early as its annual results for the fiscal year ending January 31, 2019, but no later than for its annual results for the fiscal year ending January 31, 2020, though early adoption is permitted. While the Company continues to assess the potential impacts of the new revenue standard, the Company currently expects unearned subscription revenue to decline significantly upon adoption. Currently, as the Company’s subscription offerings include software term licenses and post-contract customer support for which the Company has not established vendor specific objective evidence (“VSOE”), the entire subscription fee is recognized ratably over the term of the contract. However, under the new revenue standard, the requirement for VSOE for undelivered elements is eliminated and, as a result, the Company is required to identify all deliverables in a contract and recognize revenue based on each deliverable separately. The Company currently expects that the portion related to the software term license deliverable will be recognized upon delivery. The Company is in the process of determining the revenue recognition impact for the other deliverables of each contract. The Company continues to evaluate the effect that the new revenue standard will have on its consolidated financial statements and related disclosures, and preliminary assessments are subject to change.