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[Abstract] Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Effective interest rate during the period (percent) Debt Instrument, Interest Rate During Period General and administrative General and Administrative Expense [Member] Principles of Consolidation Consolidation, Policy [Policy Text Block] Expected term (years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Thereafter Operating Leases, Future Minimum Payments, Due After Year Four Operating Leases, Future Minimum Payments, Due After Year Four Money market funds Money market funds Money Market Funds [Member] Shares subject to repurchase Share Subject To Repurchase [Member] Share Subject To Repurchase [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Unamortized debt discount and issuance cost Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Schedule of Marketable Securities Marketable Securities [Table Text Block] Proceeds from issuance of common stock under employee stock purchase plan Proceeds from Stock Plans Statement [Table] Statement [Table] Recently Adopted Accounting Pronouncement and Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Black-Scholes option-pricing model assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Cover [Abstract] Cost of goods sold Cost of Sales [Member] Allocated public offering costs Allocated Public Offering Costs Allocated Public Offering Costs The Company and Nature of Business Nature of Operations [Text Block] Prepayment Penalty, 49-60 Months Prepayment Penalty, 49-60 Months [Member] Prepayment Penalty, 49-60 Months [Member] Related Party Transaction Related Party Transactions Disclosure [Text Block] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]