Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Statement [Line Items] Document Type Document Type Document Annual Report Document Period End Date Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One 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 Filer Category Entity Small Business Entity Emerging Growth Company ICFR Auditor Attestation Flag Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Public Float CONSOLIDATED 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 Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Operating Lease, Right-of-Use Asset Operating lease assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and Stockholders' Equity (Deficit) Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses and other current liabilities Total Operating Lease, Liability, Current Current operating lease liabilities Operating lease liabilities Notes Payable, Current Less: current portion Notes payable, net of discount, current Liabilities, Current Total current liabilities Operating Lease, Liability, Noncurrent Operating lease liabilities, net of current portion Noncurrent operating lease liabilities Derivative Liability, Noncurrent Derivative liability Deferred revenue, net of current portion Deferred revenue Notes Payable, Noncurrent Notes payable, net of discount Long-term notes payable Convertible Debt, Noncurrent 2026 convertible notes, net Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies (Note 15) Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity (deficit): Preferred Stock, Value, Issued Preferred stock, $0.0001 par value; 5,000,000 shares authorized and no shares issued or outstanding at December 31, 2020 and December 31, 2019", respectively Common Stock, Value, Issued Common stock, $0.0001 par value; 100,000,000 shares authorized and 75,996,732 and 50,333,559 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated deficit Stockholders' Equity Attributable to Parent Balance Balance Total stockholders' equity (deficit) Liabilities and Equity Total liabilities and stockholders' equity (deficit) Preferred Stock, Par or Stated Value Per Share Preferred stock, par value 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 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 CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS Revenues [Abstract] Revenue: Revenue, Product and Service [Extensible List] Revenue, Product and Service [Extensible List] Revenue from Contract with Customer, Excluding Assessed Tax Total revenue, net Operating Expenses [Abstract] Costs and operating expenses: Cost, Product and Service [Extensible List] Cost of Revenue Cost of product revenue Research and Development Expense. Research and development Selling and Marketing Expense. Selling and marketing General and Administrative Expense. General and administrative Costs and Expenses Total costs and operating expenses Operating Income (Loss) Loss from operations Nonoperating Income (Expense) [Abstract] Other income (expense): Investment Income, Net Interest income Interest Expense Interest expense Derivative, Gain (Loss) on Derivative, Net Change in fair value of derivative liability Change in fair value of derivative liability Other Nonoperating Income (Expense) Other income (expense), net Nonoperating Income (Expense) Total 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 share, basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average common shares outstanding, basic and diluted CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-in Capital Retained Earnings [Member] Accumulated Deficit Increase (Decrease) in Stockholders' Equity [Roll Forward] Stockholders' Equity (Deficit) Shares, Outstanding Balance, shares Balance, 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 Shares Issuable Under Options, Exercised Issuance of common stock upon exercise of stock options, shares Stock Issued During Period, Value, Employee Stock Purchase Plan Issuance of common stock in connection with employee stock purchase plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock in connection with employee stock purchase plan, shares Stock Issued During Period, Value, New Issues Issuance of common stock upon public offering, net of issuance costs Stock Issued During Period, Shares, New Issues Issuance of common stock upon public offering, net of issuance costs, shares Number of shares issued Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense CONSOLIDATED STATEMENTS 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 Share-based Compensation Stock-based compensation expense Amortization of Debt Issuance Costs Non-cash interest expense Depreciation, Depletion and Amortization Depreciation and amortization expense Gain (Loss) on Disposition of Property Plant Equipment Loss on disposal of property and equipment Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Inventories Inventory The increase (decrease) during the reporting period in the aggregate amount of operating lease assets. Increase (Decrease) In Operating Lease Assets Operating lease assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued expenses Increase (Decrease) in Contract with Customer, Liability Deferred revenue The amount of increase (decrease) in operating lease liabilities. Increase (Decrease) In Operating Lease Liability Operating lease liabilities 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 Convertible Debt Proceeds from issuance of 2026 convertible notes, net of issuance costs Proceeds from Stock Options Exercised Proceeds from exercise of stock options Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options Proceeds from issuance of common stock pursuant to employee stock purchase plan The cash inflow from the Paycheck Protection Program Loan. Proceeds from Paycheck Protection Program Loan Proceeds from the Paycheck Protection Program Loan The cash outflow for the repayment of the Paycheck Protection Program Loan. Repayment of Paycheck Protection Program Loan Repayment of the Paycheck Protection Program Loan Proceeds from Issuance of Common Stock Net proceeds from issuance of common stock Proceeds from issuance of common stock upon public offering, net Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by financing activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash at beginning of period Total cash, cash equivalents and restricted cash as shown on the statements of cash flows Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information: Interest Paid Cash paid for interest Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental disclosure of non-cash investing and financing activities: Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Additional right of use asset and related lease liability Capital Expenditures Incurred but Not yet Paid Additions to property and equipment included in accounts payable and accrued expenses at balance sheet dates The amount of derivative liability in connection with issuance of senior convertible notes. Derivative Liability In Connection With Issuance Of Senior Convertible Notes Derivative liability in connection with issuance of 2026 convertible notes Future cash outflow for stock issuance costs, included in accounts payable and accrued expenses at the end of the period. Stock Issuance Costs Incurred but not yet Paid Public offering costs included in accounts payable and accrued expenses at balance sheet dates Nature of the Business and Basis of Presentation Business Description and Basis of Presentation [Text Block] Nature of the Business and Basis of Presentation Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Fair Value of Financial Assets and Liabilities Fair Value Disclosures [Text Block] Fair Value of Financial Assets and Liabilities Derivative Liability Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Liability Convertible Debt [Abstract]. Convertible Notes The entire disclosure for the senior convertible notes payable. Senior Convertible Notes Payable [Text Block] Convertible Notes Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Property and Equipment, net Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Expenses No definition available. Collaboration Agreement Collaborative Arrangement Disclosure [Text Block] Collaboration Agreement Notes Payable The entire disclosure for notes payable. Notes Payable Disclosure [Text Block] Notes payable Warrants The entire disclosure for information about warrants. Warrants Disclosure [Text Block] Warrants Preferred Stock Disclosure [Abstract] Preferred Stock Preferred Stock [Text Block] Preferred Stock Common Stock Disclosure [Abstract] Common Stock The entire disclosure for common stock. Common Stock [Text Block] Common Stock Stock-Based Awards Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-Based Awards Net Loss Per Share Earnings Per Share [Text Block] Net Loss Per Share Commitments and Contingencies. Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Leases Lessee, Operating Leases [Text Block] Leases Income Taxes Income Tax Disclosure [Text Block] Income Taxes 401(k) Savings Plan Compensation and Employee Benefit Plans [Text Block] 401(k) Savings Plan Related Party Transactions Related Party Transactions Disclosure [Text Block] Related Party Transactions Restructuring and Other Costs Restructuring and Related Activities Disclosure [Text Block] Restructuring and Other Costs Subsequent Events Subsequent Events [Text Block] Subsequent Events Basis of Accounting, Policy [Policy Text Block] Basis of Presentation and Principles of Consolidation Use of Estimates, Policy [Policy Text Block] Use of Estimates Cash and Cash Equivalents, Policy [Policy Text Block] Cash Equivalents Inventory, Policy [Policy Text Block] Inventory