Document and Entity Information Statement [Table] Legal Entity [Axis] Class of Stock [Axis] Statement [Line Items] Document Type Document Quarterly Report Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Amendment Description Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Public Float Condensed Consolidated Balance Sheets Condensed Consolidated Balance Sheet Assets [Abstract] Assets Assets: Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Debt Securities, Available-for-sale, Current Marketable securities Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net of allowance for doubtful accounts of $0.7 million and $1.0 million as of April 30, 2019 and January 31, 2019, respectively Capitalized Contract Cost, Net, Current Deferred contract acquisition costs, current Deferred contract acquisition costs, current Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Total property and equipment, net Capitalized Contract Cost, Net, Noncurrent Deferred contract acquisition costs, noncurrent Deferred contract acquisition costs, noncurrent Goodwill Goodwill Finite-Lived Intangible Assets, Net Intangible assets, net Intangible assets, net Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities, Redeemable Convertible Preferred Stock, and Stockholders' Deficit Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses Accrued expenses Employee-related Liabilities, Current Accrued payroll and benefits Accrued payroll and benefits Contract with Customer, Liability, Current Deferred revenue Deferred revenue, current Other Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Contract with Customer, Liability, Noncurrent Deferred revenue, noncurrent Other Liabilities, Noncurrent Other liabilities, noncurrent Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 11) Temporary Equity [Abstract] Redeemable Convertible Preferred Stock Temporary Equity, Carrying Amount, Attributable to Parent Ending Balance Beginning Balance Redeemable convertible preferred stock, $0.0005 par value; 137,419 shares authorized as of both April 30, 2019 and January 31, 2019; 131,268 shares issued and outstanding as of both April 30, 2019 and January 31, 2019; liquidation preference $545,000 as of both April 30, 2019 and January 31, 2019 Net Carrying Value Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Deficit Stockholders' Equity: Common Stock, Value, Issued Common stock, $0.0005 par value; 220,000 shares authorized as of both April 30, 2019 and January 31, 2019; 48,127, and 47,421 shares issued and outstanding as of April 30, 2019 and January 31, 2019, respectively Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Stockholders' Equity Attributable to Parent Ending Balance Beginning Balance Total stockholders' deficit Liabilities and Equity Total liabilities, redeemable convertible preferred stock, and stockholders' deficit Accounts Receivable, Allowance for Credit Loss, Current Accounts receivable, allowance for doubtful accounts Temporary Equity, Par or Stated Value Per Share Redeemable preferred stock, par value (in dollars per share) Temporary Equity, Shares Authorized Redeemable preferred stock, shares authorized (in shares) Shares Authorized (in shares) Temporary Equity, Shares Issued Redeemable preferred stock, shares issued (in shares) Shares Issued (in shares) Temporary Equity, Shares Outstanding Ending Balance (in shares) Beginning Balance (in shares) Redeemable preferred stock, shares outstanding (in shares) Shares Outstanding (in shares) Temporary Equity, Liquidation Preference Redeemable preferred stock, liquidation preference Liquidation Preference Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, shares authorized (in shares) Common Stock, Shares, Issued Common stock, shares issued (in shares) Common Stock, Shares, Outstanding Common stock, shares outstanding (in shares) Condensed Consolidated Statements of Operations Condensed Consolidated Statement of Operations Revenue. Revenue Revenue Total revenue Cost of revenue Cost of revenue Total cost of revenue Total cost of revenue Gross Profit Gross profit Operating Expenses [Abstract] Operating expenses Selling and Marketing Expense Sales and marketing Research and Development Expense Research and development General and Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Interest Expense Interest expense Other Nonoperating Income (Expense) Other income (expense), net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss before provision for income taxes Income Tax Expense (Benefit) Provision for income taxes Income tax expense Net Income (Loss) Attributable to Parent Net loss attributable to common stockholders Net loss Net loss Earnings Per Share, Basic and Diluted Net loss per share attributable to common stockholders, basic and diluted Net loss per share, basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted Weighted average common shares outstanding, basic and diluted Product and Service [Axis] Condensed Consolidated Statements of Comprehensive Loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive loss: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustments Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Unrealized loss on available-for-sale securities, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive loss Other comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive loss Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit Equity Components [Axis] Increase (Decrease) in Temporary Equity [Roll Forward] Redeemable Convertible Preferred Stock Increase (Decrease) in Stockholders' Equity [Roll Forward] Stockholders' Deficit Shares, Outstanding Ending Balance (in shares) Beginning Balance (in shares) Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative effect of accounting change Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Issuance of common stock upon exercise of options (in shares) Value of stock issued as a result of the exercise of early stock options. Stock Issued During Period Value Early Stock Options Exercised Issuance of common stock related to early exercise options Number of early share options (or share units) exercised during the current period. Stock Issued During Period Shares Early Stock Options Exercised Issuance of common stock related to early exercise options (in shares) Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock awards Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of restricted stock awards (in shares) Amount of increase to additional paid-in capital (APIC) for vesting of early exercised options. Adjustments to Additional Paid in Capital Share Based Compensation Vesting of Early Exercised Options Vesting of early exercised options APIC, Share-based Payment Arrangement, Increase for Cost Recognition Stock-based compensation expense Amount of increase to additional paid-in capital (APIC) for recognition of capitalized cost for award under share-based payment arrangement. Adjustments to Additional Paid in Capital Capitalized Share Based Compensation Requisite Service Period Recognition Value Capitalized stock-based compensation Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Operating activities Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Amount of depreciation and amortization excluding amortization of intangible assets and deferred contract acquisition costs. Depreciation And Amortization Excluding Intangible Assets And Deferred Contract Acquisition Costs Depreciation and amortization Amortization of Intangible Assets Amortization of intangible assets Amount of amortization of deferred contract acquisition costs recognized in the income statement. Amortization of Deferred Contract Acquisition Costs Amortization of deferred contract acquisition costs Fair Value Adjustment of Warrants Change in fair value of redeemable convertible preferred stock warrant liability Accounts Receivable, Credit Loss Expense (Reversal) Allowance for doubtful accounts Share-based Payment Arrangement, Noncash Expense Stock-based compensation expense Accretion (Amortization) of Discounts and Premiums, Investments Accretion of marketable securities purchased at a discount Other Noncash Income (Expense) Other Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities Increase (Decrease) in Accounts Receivable Accounts receivable Amount of increase (decrease) in deferred contract acquisition costs. Increase Decrease in Deferred Contract Acquisition Costs Deferred contract acquisition costs Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses and other current liabilities Increase (Decrease) in Employee Related Liabilities Accrued payroll and benefits Increase (Decrease) in Contract with Customer, Liability Deferred revenue Increase (Decrease) in Other Noncurrent Liabilities Other liabilities, noncurrent Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Investing activities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments to Develop Software Capitalized internal-use software Payments to Acquire Debt Securities, Available-for-sale Purchases of marketable securities Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from sales of marketable securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Maturities of marketable securities Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Financing activities Repayments of Related Party Debt Repayment of notes receivable from related parties Proceeds from (Repayments of) Related Party Debt Repayment of notes receivable from related parties The cash outflows for the payment of indemnity holdback. Payments of Indemnity Holdback Payments of indemnity holdback Payments of Stock Issuance Costs Payments of deferred offering costs Proceeds from Stock Options Exercised Proceeds from issuance of common stock upon exercise of stock options Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Effect of foreign exchange rates on cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents, end of period Cash and cash equivalents, beginning of period Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information: Interest Paid, Excluding Capitalized Interest, Operating Activities Interest paid Income Taxes Paid, Net Income taxes paid Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental disclosure of non-cash investing and financing activities: Escrow Deposit Disbursements Related to Property Acquisition Indemnity holdback consideration associated with business combinations Represents the amount of contingent consideration associated with business combination. Contingent Consideration Associated With Business Combinations Contingent consideration associated with business combinations Represents the amount of net change in deferred offering costs, accrued but not paid. Net Change In Deferred Offering Costs, Accrued But Not Paid Net change in deferred offering costs, accrued but not paid Capital Expenditures Incurred but Not yet Paid Net change in property and equipment included in accounts payable and accrued expenses Description of Business and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Description of Business and Basis of Presentation Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Fair Value Measurements and Marketable Securities Fair Value Disclosures [Text Block] Fair Value Measurements and Marketable Securities Balance Sheet Components The entire disclosure for balance sheet components of the entity. Balance Sheet Components. Balance Sheet Components Secured Revolving Credit Facility Debt Disclosure [Text Block] Secured Revolving Credit Facility Income Taxes Income Tax Disclosure [Text Block] Income Taxes Redeemable Convertible Preferred Stock The entire disclosure for temporary equity. Temporary Equity Disclosure [Text Block] Redeemable Convertible Preferred Stock Common Stock Stockholders' Equity Note Disclosure [Text Block] Common Stock Stock-Based Compensation Share-based Payment Arrangement [Text Block] Stock-Based Compensation Revenue, Deferred Revenue and Remaining Performance Obligations Revenue from Contract with Customer [Text Block] Revenue, Deferred Revenue and Remaining Performance Obligations Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Geographic Information