Document and entity information. Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Statement [Line Items] 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 Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement of Financial Position [Abstract] Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Accounts Receivable, Net, Current Accounts receivable, net Due from Related Parties, Current Amounts due from related parties Due from related party Inventory, Net Inventory Total inventory Processing cost Prepaid Expense and Other Assets, Current 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 Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Total intangible assets, net Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities, Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Total accrued liabilities Due to Related Parties, Current Amounts due to related parties Deferred Revenue, Current Deferred income on shipments to distributors Derivative Liability, Current Derivative liability Notes Payable, Related Parties, Current Convertible promissory notes payable-related party Debt instrument, carrying value Long-term Debt, Current Maturities Current portion of long-term debt Net carrying value of debt, Current Portion Liabilities, Current Total current liabilities Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Noncurrent Redeemable convertible preferred stock warrant liability Deferred Revenue, Noncurrent Deferred revenue Long-term Debt, Excluding Current Maturities Long-term debt, net of current portion Net carrying value of debt, Long-term debt Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Temporary Equity, Carrying Amount, Attributable to Parent Balance Balance Carrying Value Redeemable convertible preferred stock, $0.0001 par value per share; zero and 68,080,000 shares authorized as of December 31, 2016 and 2015, zero and 2,486,199 shares issued and outstanding as of December 31, 2016 and 2015 Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity (deficit): Preferred Stock, Value, Issued Preferred stock, $0.0001 par value per share; 5,000,000 and zero shares authorized as of December 31, 2016 and 2015 , zero shares issued and outstanding as of December 31, 2016 and 2015 Common Stock, Value, Issued Common stock, $0.0001 par value per share; 100,000,000 and 175,000,000 shares authorized as of December 31, 2016 and 2015, 12,498,128 and 3,015,281 shares issued and outstanding as of December 31, 2016 and 2015 Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity (deficit) Liabilities and Equity Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) Temporary Equity, Par or Stated Value Per Share Redeemable convertible preferred stock, par value Temporary Equity, Shares Authorized Redeemable convertible preferred stock, shares authorized Shares Authorized Temporary Equity, Shares Issued Redeemable convertible preferred stock, shares issued Temporary Equity, Shares Outstanding Balance (in shares) Balance (in shares) Redeemable convertible preferred stock, shares outstanding Shares Issued and Outstanding Preferred Stock, Par Value Preferred stock, par value Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Common Stock, Par or Stated Value Per Share Common stock, par value 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] Sales Revenue, Goods, Net Product sales (including related party sales of $2,378 and $3,472 and $3,191 for the years ended December 31, 2016, 2015 and 2014) Licenses Revenue Licensing and royalty revenue Revenue, Net Total revenue Total revenue Cost of Goods Sold Cost of sales Gross Profit Gross profit Gross profit Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development Research and development expense General and Administrative Expense General and administrative Selling and Marketing Expense Sales and marketing Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Interest Expense Interest expense Other Nonoperating Income (Expense) Other income (expense), net Net Income (Loss) Attributable to Parent Net loss Net loss and comprehensive loss Earnings Per Share, Basic and Diluted Net loss per common share, basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted-average common shares outstanding used to calculate net loss per common share, basic and diluted Weighted-average shares used to compute net loss per common share, basic and diluted Revenue from Related Parties Related party sales Statement of Stockholders' Equity [Abstract] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Shares, Outstanding Balance (in shares) Balance (in shares) Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of redeemable convertible preferred stock to common stock Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of convertible securities Conversion of redeemable convertible preferred stock to common stock (in shares) Debt Conversion, Converted Instrument, Amount Conversion of convertible promissory notes Debt Conversion, Converted Instrument, Shares Issued Conversion of convertible promissory notes (in shares) Represents the amount of increase in additional paid in capital (APIC) resulting from reclassification of convertible preferred stock warrant liability. Adjustments To Additional Paid In Capital Reclassification Of Convertible Preferred Stock Warrant Liability Reclassification of redeemable convertible preferred stock warrant liability to additional paid in capital Reclassification to additional paid-in capital Stock Issued During Period, Value, New Issues Issuance of common stock Stock Issued During Period, Shares, New Issues Issuance of Series B redeemable convertible stock (in shares) Number of shares sold Stock issued during period (in shares) Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of Options, Options exercised Issuance of common stock upon exercise of stock options (in shares) Represents the amount of increase in additional paid in capital (APIC) resulting from vesting of common stock. Adjustments To Additional Paid In Capital Share Based Compensation Vesting Of Common Stock Compensation expense related to vesting of common stock issued to GLOBAL FOUNDRIES Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense Temporary Equity [Abstract] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Redeemable Convertible Preferred Stock Temporary Equity, Stock Issued During Period, Value, New Issues Issuance of Series B redeemable convertible stock Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss on disposal of property and equipment Share-based Compensation Stock-based compensation Fair Value Adjustment of Warrants Change in fair value of redeemable convertible preferred stock warrant liability Loss from remeasurement Derivative, Gain (Loss) on Derivative, Net Change in fair value of derivative liability Amortization of Debt Issuance Costs and Discounts Non-cash interest expense Compensation expense related to vesting of common stock. Compensation Expense Related To Vesting of Common Stock Compensation expense related to vesting of common stock to GLOBALFOUNDRIES Non-cash compensation expense (income) Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Due from Related Parties, Current Amounts due from related parties Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Inventories Inventory Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities Increase (Decrease) in Due to Related Parties, Current Amounts due to related parties Increase (Decrease) in Deferred Revenue Deferred income on shipments to distributors The increase (decrease) during the reporting period, excluding the portion taken into income, in the long-term liability reflecting revenue yet to be earned for which cash or other forms of consideration was received or recorded as a receivable. Increase (Decrease) in Deferred Revenue, Noncurrent Deferred revenue Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cash flows from investing activities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from financing activities Proceeds from Related Party Debt Proceeds from convertible promissory notes-related party Proceeds from Issuance of Debt Proceeds from debt Repayments of Debt Payments on debt Payments of Debt Issuance Costs Payments of debt issuance costs Repayments of Long-term Capital Lease Obligations Payments on capital lease obligation Proceeds from Issuance of Convertible Preferred Stock Proceeds from issuance of convertible preferred stock Proceeds from Stock Options Exercised Proceeds from exercise of stock options Proceeds from Issuance of Common Stock Proceeds from issuance of common stock Proceeds from Issuance Initial Public Offering Net proceeds from initial public offering Proceeds from issuance of common stock in connection with initial public offering, net of offering costs Proceeds from Issuance of Private Placement Net proceeds from issuance of common stock in private placement Net proceeds from issuance of common stock in private placement, net of issuance costs Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplementary cash flow information: The amount of cash paid for interest, excluding related party interest, during the period. Interest Paid Excluding Related Party Interest Interest Paid The amount of cash paid for related party interest. Interest Paid, Related Party Interest paid to related party Noncash Investing and Financing Items [Abstract] Non-cash investing and financing activities: Capital Lease Obligations Incurred Purchase of property and equipment under capital lease obligations Debt Conversion, Original Debt, Amount Conversion of convertible promissory notes into common stock Non-cash issuance of warrants in connection with debt. Noncash Issuance Of Warrants In Connection With Debt Issuance of warrants with debt Conversion of Stock, Amount Converted Conversion of redeemable preferred stock into common stock Organization and Operations Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization and Operations Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Balance Sheet Components Commitments and Contingencies. Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Debt and Related Warrants Debt and Capital Leases Disclosures [Text Block] Debt and Related Warrants Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) Stockholders' Equity Note Disclosure [Text Block] Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation 401 (k) Plan Pension and Other Postretirement Benefits Disclosure [Text Block] 401 (k) Plan Related Party Transactions Related Party Transactions Disclosure [Text Block] Related Party Transactions Geographic Information Segments Segment Reporting Disclosure [Text Block] Geographic Information Income Taxes Income Tax Disclosure [Text Block] Income Taxes Net Loss Per Share Earnings Per Share [Text Block] Net Loss Per Share Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Selected Quarterly Financial Data (Unaudited) Subsequent Events Subsequent Events [Text Block] Subsequent Events Use of Estimates, Policy [Policy Text Block] Use of Estimates Segment Reporting, Policy [Policy Text Block] Segments Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Trade and Other Accounts Receivable, Policy [Policy Text Block] Accounts Receivable Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Inventory, Policy [Policy Text Block] Inventory Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment of Long-lived Assets Intangible Assets, Finite-Lived, Policy [Policy Text Block] Intangible Assets Stockholders' Equity Note, Redeemable Preferred Stock, Issue, Policy [Policy Text Block] Redeemable Convertible Preferred Stock Warrant Liability Revenue Recognition, Policy [Policy Text Block] Revenue Recognition Standard Product Warranty, Policy [Policy Text Block] Product Warranty Research and Development Expense, Policy [Policy Text Block] Research and Development Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Stock-based Compensation Income Tax, Policy [Policy Text Block] Income Taxes Comprehensive Income, Policy [Policy Text Block] Comprehensive Loss Earnings Per Share, Policy [Policy Text Block] Net Loss per Common Share New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Financial Instrument [Axis] Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Financial Instruments [Domain] Derivative [Member] Derivative Liability