Entity Central Index Key Tax cuts and jobs act of 2017 incomplete accounting change in tax rate non cash deferred tax expense. Document and entity information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Preferred stock warrant liabilities. Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable, net Receivables Net Current Inventory Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Other assets Other Assets Noncurrent TOTAL ASSETS Assets LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) Liabilities And Stockholders Equity [Abstract] CURRENT LIABILITIES: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued and other liabilities Accrued Liabilities And Other Liabilities Deferred revenue Deferred Revenue Current Current portion of long-term debt, net of discount of $270 and $551 as of December 31, 2017 and 2016 Long Term Debt Current Total current liabilities Liabilities Current Other long-term liabilities Other Liabilities Noncurrent Preferred stock warrant liabilities Preferred Stock Warrant Liabilities Long-term debt, net of discount of $29 and $299 as of December 31, 2017 and 2016 Long Term Debt Noncurrent TOTAL LIABILITIES Liabilities Commitments and Contingencies (Note 6) Commitments And Contingencies Convertible preferred stock, $0.0001 par value; no and 236,154,444 shares authorized as of December 31, 2017 and 2016; no and 21,142,295 shares issued and outstanding as of December 31, 2017 and 2016; aggregate liquidation preference of no and $142,231 as of December 31, 2017 and 2016 Temporary Equity Carrying Amount Attributable To Parent STOCKHOLDERS’ EQUITY (DEFICIT): Stockholders Equity [Abstract] Preferred stock, $0.0001 par value: 10,000,000 and no shares authorized as of December 31, 2017 and 2016; no shares issued and outstanding as of December 31, 2017 and 2016 Preferred Stock Value Common stock, $0.0001 par value: 300,000,000 and 350,490,000 shares authorized as of December 31, 2017 and 2016; 28,940,282 and 1,615,495 shares issued and outstanding as of December 31, 2017 and 2016 Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit TOTAL STOCKHOLDERS’ EQUITY (DEFICIT) Stockholders Equity TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) Liabilities And Stockholders Equity Current portion of long-term debt, discount Debt Instrument Unamortized Discount Current Long-term debt, discount Debt Instrument Unamortized Discount Noncurrent Temporary equity liquidation preference par or stated value per share. Convertible preferred stock at liquidation preference par value Temporary Equity Liquidation Preference Par Or Stated Value Per Share Convertible preferred stock, shares authorized Temporary Equity Shares Authorized Convertible preferred stock, shares issued Temporary Equity Shares Issued Convertible preferred stock, shares outstanding Temporary Equity Shares Outstanding Aggregate liquidation preference Temporary Equity Liquidation Preference Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Consolidated Statements of Operations Data: Net Income Loss [Abstract] Revenue, net Revenues Cost of revenue Cost Of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense Sales and marketing Selling And Marketing Expense General and administrative General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Other income (expense), net: Nonoperating Income Expense [Abstract] Interest expense Interest Income Expense Nonoperating Net Gain on sale of investment Available For Sale Securities Gross Realized Gain Loss Net Other income (expense) Other Nonoperating Income Expense Total other income (expense), net Nonoperating Income Expense Net loss before provision for income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net loss Net Income Loss Net loss per share, basic and diluted Earnings Per Share Basic And Diluted Weighted-average shares used in computing net loss per share, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Statement Of Income And Comprehensive Income [Abstract] Net loss Other comprehensive income (loss): Other Comprehensive Income Loss Tax [Abstract] Cumulative translation adjustment Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax Comprehensive loss Comprehensive Income Net Of Tax Temporary equity stock issued during period shares new issues. Stock issued during period value reverse stock split. Reclassification of preferred stock warrant liabilities to additional paid in capital. Stock issued during period shares conversion of convertible preferred stock. Stock issued during period value conversion of convertible preferred stock. Stock issued during period value warrants exercised. Stock issued during period shares warrants exercised. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Convertible Preferred Stock Convertible Preferred Stock [Member] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Beginning balance, value Beginning balance, shares Beginning balance, value Beginning balance, shares Shares Outstanding Issuance of common stock pursuant to stock option exercises of vested options Stock Issued During Period Value Stock Options Exercised Issuance of common stock pursuant to stock option exercises of vested options, shares Stock Issued During Period Shares Stock Options Exercised Issuance of Series C convertible preferred stock for cash, net of issuance costs, value Temporary Equity Stock Issued During Period Value New Issues Issuance of Series C convertible preferred stock for cash, net of issuance costs, shares Temporary Equity Stock Issued During Period Shares New Issues Vesting of shares purchased under an early exercise of stock options Adjustments To Additional Paid In Capital Sharebased Compensation And Exercise Of Stock Options Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Adjustment for fractional shares from reverse stock split, shares Stock Issued During Period Shares Reverse Stock Splits Reclassification of preferred stock warrant liabilities to additional paid in capital Reclassification Of Preferred Stock Warrant Liabilities To Additional Paid In Capital Conversion of convertible notes to common stock, value Stock Issued During Period Value Conversion Of Convertible Securities Conversion of convertible notes to common stock, shares Stock Issued During Period Shares Conversion Of Convertible Securities Conversion of preferred stock to common stock upon initial public offering, value Stock Issued During Period Value Conversion Of Convertible Preferred Stock Conversion of preferred stock to common stock upon initial public offering, shares Stock Issued During Period Shares Conversion Of Convertible Preferred Stock Issuance of common stock in connection with initial public offering, net of issuance costs, value Stock Issued During Period Value New Issues Issuance of common stock in connection with initial public offering, net of issuance costs, shares Stock Issued During Period Shares New Issues Issuance of common stock upon exercise of common stock warrants, shares Stock Issued During Period Shares Warrants Exercised Other comprehensive income (loss) Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Ending balance, value Ending balance, shares Ending balance, value Ending balance, shares Adjustment for fractional shares from reverse stock split, value Stock Issued During Period Value Reverse Stock Split Issuance of common stock upon exercise of common stock warrants, value Stock Issued During Period Value Warrants Exercised Temporary equity stock issuance costs. Stock issuance costs. Issuance of Series C convertible preferred stock for cash, issuance costs Temporary Equity Stock Issuance Costs Issuance of common stock in connection with initial public offering, issuance costs Stock Issuance Costs Proceeds from (payments for) issuance of convertible preferred stock. Noncash or part noncash vesting of shares purchased under an early exercise of stock options. Noncash or part noncash reclassification of preferred stock warrant liabilities to equity. Noncash or part noncash conversion of convertible notes and accrued interest into common stock. Noncash or part non-cash lease incentive. Statement Of Cash Flows [Abstract] Series C Preferred Stock Series C Preferred Stock [Member] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Loss on disposal of property and equipment Gain Loss On Sale Of Property Plant Equipment Amortization of debt issuance costs Amortization Of Financing Costs Stock-based compensation Allocated Share Based Compensation Expense Changes in fair value of preferred stock warrant liabilities Fair Value Adjustment Of Warrants Gain on sale of investment Non-cash interest expense on convertible notes Interest Expense Subordinated Notes And Debentures Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Inventory Increase Decrease In Inventories Prepaid expenses and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Accrued and other liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Net cash used in operating activities Net Cash Provided By Used In Operating Activities Continuing Operations CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Proceeds from sale of property and equipment Proceeds From Sale Of Property Plant And Equipment Proceeds from sale of investment Proceeds From Sale Of Available For Sale Securities Purchases of property and equipment Payments To Acquire Property Plant And Equipment Net cash provided by (used in) investing activities Net Cash Provided By Used In Investing Activities Continuing Operations CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Proceeds from issuance of common stock upon initial public offering, net Proceeds From Issuance Initial Public Offering Proceeds from convertible notes Proceeds From Issuance Of Debt Proceeds from issuance of Series C convertible preferred stock, net Proceeds From Payments For Issuance Of Convertible Preferred Stock Proceeds from exercised stock options Proceeds From Stock Options Exercised Proceeds from long-term debt, net Proceeds From Issuance Of Long Term Debt Principal payments on long-term debt Repayments Of Long Term Debt Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid Cash paid for interest Interest Paid SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Vesting of shares purchased under an early exercise of stock options Noncash Or Part Noncash Vesting Of Shares Purchased Under An Early Exercise Of Stock Options Issuance of preferred stock warrants in connection with long-term debt Debt Conversion Converted Instrument Amount1 Conversion of preferred stock into common stock Conversion Of Stock Amount Converted1 Reclassification of preferred stock warrant liabilities to equity Noncash Or Part Noncash Reclassification Of Preferred Stock Warrant Liabilities To Equity Conversion of convertible notes and accrued interest into common stock Noncash Or Part Noncash Conversion Of Convertible Notes And Accrued Interest Into Common Stock Non-cash lease incentive Noncash Or Part Noncash Lease Incentive Organization Consolidation And Presentation Of Financial Statements [Abstract] Nature of Operations Nature Of Operations Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Earnings Per Share [Abstract] Net Loss per Share Earnings Per Share [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Balance sheet components. Balance Sheet Components [Abstract] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Debt Disclosure [Text Block] Temporary Equity Disclosure [Abstract] Preferred Stock Preferred Stock [Text Block] Preferred and common stock warrants. Equity [Abstract] Preferred and Common Stock Warrants Preferred And Common Stock Warrants [Text Block] Common stock reserved for issuance. Common Stock Reserved For Issuance Common Stock Reserved For Issuance [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Stock Option Plan Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Segment Reporting [Abstract] Geographic Information Segment Reporting Disclosure [Text Block] Quarterly Financial Data [Abstract] Selected Quarterly Financial Data Quarterly Financial Information [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Liquidity. Liquidity Liquidity Policy [Text Block]