Document and entity information. Document And Entity Information 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 Current Reporting Status Entity Filer Category Entity Filer Category 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 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 Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders? Equity 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 Long-term Debt, Current Maturities Current portion of long-term debt Net carrying value of debt, Current Portion Liabilities, Current Total current liabilities 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 Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Preferred Stock, Value, Issued Preferred stock, $0.0001 par value per share; 5,000,000 shares authorized as of March 31, 2017 and December 31, 2016; no shares issued and outstanding as of March 31, 2017 and December 31, 2016 Common Stock, Value, Issued Common stock, $0.0001 par value per share; 100,000,000 shares authorized as of March 31, 2017 and December 31, 2016; 12,500,178 and 12,498,128 shares issued and outstanding as of March 31, 2017 and December 31, 2016 Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Preferred Stock, Par Value 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 $572, and $734 for the three months ended March 31, 2017 and 2016) Product sales Licenses Revenue Licensing and royalty revenue (including related party revenue of $569 and zero for the three months ended March 31, 2017 and 2016, respectively) Licensing and royalty revenue Revenue, Net Total revenue Cost of Goods Sold Cost of sales 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 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 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 Inventories Inventory Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets 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 Stock Options Exercised Proceeds from exercise of stock options Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash (used in) provided by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net (decrease) increase 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 Noncash Investing and Financing Items [Abstract] Non-cash investing and financing activities: Liabilities Assumed Purchase of property and equipment in accounts payable Organization and Nature of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Organization and Nature of Business 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 Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation Related Party Transactions Related Party Transactions Disclosure [Text Block] Related Party Transactions Net Loss Per Common Share Earnings Per Share [Text Block] Net Loss Per Common Share Subsequent Events Subsequent Events [Text Block] Subsequent Events Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Use of Estimates, Policy [Policy Text Block] Use of Estimates Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Revenue Recognition, Policy [Policy Text Block] Revenue Recognition Earnings Per Share, Policy [Policy Text Block] Net Loss per Common Share New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Schedule of Revenue and Accounts Receivable for Each Significant Customer Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value of Financial Assets Measured on Recurring Basis Schedule of Inventory, Current [Table Text Block] Schedule of Inventory Schedule of Accrued Liabilities [Table Text Block] Schedule of Accrued Liabilities Schedule of Debt [Table Text Block] Summary of 2015 Credit Facility Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Stock Option Activity Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of Stock-Based Compensation Expense Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Fair Value Assumptions of Stock Options Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Computation of Basic and Diluted Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Potentially Dilutive Securities Excluded from Diluted Net Loss Per Common Share Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales Revenue Net [Member] Revenue Accounts Receivable [Member] Accounts Receivable, net Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk Customer [Axis] Name Of Major Customer [Domain] Customer [Domain] Customer A. Customer A [Member] Customer A Customer B. Customer B [Member] Customer B Customer C. Customer C [Member] Customer C Customer D. Customer D [Member] Customer D Concentration Risk [Line Items] Concentration risk Concentration Risk, Percentage Concentration risk percentage Fair Value Measurements, Recurring and Nonrecurring [Table] Cash and Cash Equivalents [Axis] Restricted Cash And Cash Equivalents Cash And Cash Equivalents [Member] Cash and Cash Equivalents [Domain] Money Market Funds [Member] Money Market Funds Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Inputs Level1 [Member] Level 1 Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Cash and Cash Equivalents, Fair Value Disclosure Money market funds Assets, Fair Value Disclosure, Recurring Total assets measured at fair value Deferred Revenue and Credits, Current Deferred revenue Deferred Costs, Current Deferred cost of sales Inventory Disclosure [Abstract] Inventory Inventory, Raw Materials, Net of Reserves Raw materials Inventory, Work in Process, Net of Reserves Work-in-process Inventory, Finished Goods, Net of Reserves Finished goods Accrued Liabilities, Current [Abstract] Accrued liabilities Accrued Salaries, Current Accrued payroll-related expenses Accrued manufacturing expenses current. Accrued Manufacturing Expenses Current Accrued manufacturing-related costs Deferred licensing revenue current portion. Deferred Licensing Revenue Current Deferred licensing revenue Deferred Rent Credit, Current Deferred rent Accrued Sales Commission, Current Accrued sales commissions payable to sales representatives Other Accrued Liabilities, Current Other Lessee Leasing Arrangements, Operating Leases, Term of Contract Term of lease (in years) Area real estate property covered under the operating lease. Area Of Operating Lease Area of operating lease (in sq feet) Line of Credit Facility [Table] Line of Credit Facility [Line Items] 2015 Credit Facility Long-term debt before unamortized (discount) premium, debt issuance costs and end of term fee, current. Long Term Debt Current Gross Debt, including end of term fee, Current Portion Amount of unamortized (discount) premium, debt issuance costs and end of term fee, current. Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Current Less: Discount attributable to warrants, end of term fee and debt issuance costs, Current Portion Long-term debt before unamortized (discount) premium, debt issuance costs and end of term fee, noncurrent. Long Term Debt Noncurrent Gross Debt, including end of term fee, Long-term debt Amount of unamortized (discount) premium, debt issuance costs and end of term fee, noncurrent. Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Noncurrent Less: Discount attributable to warrants, end of term fee and debt issuance costs, Long-term debt Long-term debt before unamortized (discount) premium, debt issuance costs and end of term fee. Long Term Debt Gross Debt, including end of term fee, Total Amount of unamortized (discount) premium, debt issuance costs and end of term fee Unamortized Discount Premium And Debt Issuance Costs And End Of Term Fee Less: Discount attributable to warrants, end of term fee and debt issuance costs, Total Long-term Debt Net carrying value of debt, Total Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain]