Document and entity information. Document And Entity Information Statement [Table] Statement [Line Items] Statement 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 Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Condensed Balance Sheets Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Accounts Receivable, Net, Current Accounts receivable, net Inventory, Net Inventory Total inventory Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Total current assets Property, Plant and Equipment, Net Property and equipment, net Other Assets, Noncurrent Other assets Assets Total 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 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 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 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; no shares issued and outstanding as of September 30, 2018 and December 31, 2017 Common Stock, Value, Issued Common stock, $0.0001 par value per share; 100,000,000 shares authorized; 17,065,846 and 12,817,201 shares issued and outstanding as of September 30, 2018 and December 31, 2017 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 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 Condensed Statements of Operations and Comprehensive Loss Revenues Total revenue Cost of Goods and Services Sold Cost of sales Total 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 Loss from operations Interest Expense Interest expense Other Nonoperating Income (Expense) Other income, net Gain (Loss) on Extinguishment of Debt Loss on extinguishment of debt Gain on extinguishment of debt Net Income (Loss) Attributable to Parent Net loss Net loss and comprehensive loss Net loss and comprehensive loss Earnings Per Share, Basic and Diluted Net loss per common 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 Condensed Statement of Cash Flows Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from 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 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 the non-cash difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. Non Cash Gain (Loss) on Extinguishment of Debt Non-cash loss on extinguishment of debt 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 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 a Contract with Customer Liability Deferred income on shipments to distributors The increase (decrease) in shipping terms. Increase Decrease in Shipping Terms Shipping term reversal 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 Issuance of Common Stock Proceeds from the issuance of common stock, net of offering costs 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 Shares under Incentive and Share-based Compensation Plans, Including Stock Options Proceeds from exercise of stock options and purchase of shares in employee stock purchase plan 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 Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Supplemental Cash Flow Information [Abstract] Supplementary cash flow information: Interest Paid, Net Interest paid Noncash Investing and Financing Items [Abstract] Non-cash investing and financing activities: Liabilities Assumed Purchase of property and equipment in accounts payable Non-cash issuance of warrants in connection with debt. Noncash Issuance Of Warrants In Connection With Debt Issuance of warrants with debt 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 Revenue Revenue from Contract with Customer [Text Block] Revenue 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 Debt and Capital Leases Disclosures [Text Block] Debt Stockholders’ Equity Stockholders' Equity Note Disclosure [Text Block] Stockholders’ Equity Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Compensation na Significant Agreements The entire disclosure for significant arrangements. Significant Arrangements [Text Block] Significant Agreements 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 Trade and Other Accounts Receivable, Policy [Policy Text Block] Accounts receivable, net 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 from Contract with Customer [Policy Text Block] Revenue Recognition Earnings Per Share, Policy [Policy Text Block] Net Loss per Common Share Reclassification, Policy [Policy Text Block] Prior Period Reclassifications New Accounting Pronouncements, Policy [Policy Text Block] Recently Adopted Pronouncements and Recently Issued Pronouncements Tabular disclosure of accounts receivable net. Schedule of Accounts Receivable Net [Table Text Block] Schedule of accounts receivable net 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 New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of impact of adopting Topic 606 Disaggregation of Revenue [Table Text Block] Schedule of disaggregation of revenue 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 Debt Schedule of Maturities of Long-term Debt [Table Text Block] Summary of Principal Repayments of Credit Facility Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Stock Option Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Restricted Stock Unit 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 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 Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts receivable, net Accounts Receivable, Gross Trade accounts receivable Unbilled Contracts Receivable Unbilled accounts receivable Allowance for Doubtful Accounts Receivable Allowance for accounts receivable Accounts Receivable, Net Accounts receivable, net 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 Customer E. Customer E [Member] Customer E Customer F. Customer F [Member] Customer F Customer G. Customer G [Member] Customer G Customer H. Customer H [Member] Customer H Customer I. Customer I [Member] Customer I Range [Axis] Range [Member] Range [Domain] Maximum [Member] Maximum Concentration Risk [Line Items] Concentration risk Concentration Risk, Percentage Concentration risk percentage Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Fair Value Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Measurements Recurring [Member] Recurring 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