Document and Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Interactive Data Current Entity Current Reporting Status Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Common Stock, Shares Outstanding Entity Shell Company Document Fiscal Year Focus Document Fiscal Period Focus Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Public Float CONSOLIDATED BALANCE SHEETS Statement [Table] Statement [Line Items] Accounting Policies STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash Cash Cash at end of period Accounts Receivable, Net, Current Accounts receivable, net Inventory, Net Inventory Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Prepaid expenses and other current assets Assets, Current Total current assets Assets, Noncurrent [Abstract] Non-current assets: Property, Plant and Equipment, Net Property and equipment, net Property and equipment—net Inventory, Noncurrent Long-term inventory Operating Lease, Right-of-Use Asset Right-of-use assets Restricted Cash and Cash Equivalents, Noncurrent Less restricted cash Restricted cash 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 expenses and other current liabilities Accrued expenses Accrued expenses Operating Lease, Liability, Current Current portion of lease liabilities Lease liabilities Liabilities, Current Total current liabilities Liabilities, Noncurrent [Abstract] Long-term liabilities: Finance Lease, Liability, Noncurrent Long-term lease liability - less current portion Long-term Debt, Excluding Current Maturities Long-term debt Long-term debt, net Liabilities, Noncurrent Total long-term liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and Contingencies (Note 14) Accrued contingencies Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Common Stock, Value, Issued Common stock, $0.001 par value; 120,000,000 shares authorized as of December 31, 2019 and December 31, 2018; 36,086,254 and 33,863,077 shares issued and outstanding as of December 31, 2019 and December 31, 2018, respectively Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Balance as of end of period Balance as of beginning of period Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Preferred Stock, Shares Authorized Preferred stock, authorized 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, authorized Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Outstanding Common stock, shares outstanding CONSOLIDATED STATEMENTS OF OPERATIONS Revenue from Contract with Customer, Including Assessed Tax Product revenues, net Operating Expenses [Abstract] Costs and expenses: The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. Product Revenue Cost Cost of product revenues General and Administrative Expense Selling, general and administrative Research and Development Expense Research and development Research and development expenses Operating Expenses Total operating expenses Total costs and expenses Operating Income (Loss) Loss from operations Other Income and Expenses [Abstract] Other income (expense): Interest Income, Other Interest income Interest Expense Interest expense Interest expense Gain (Loss) on Extinguishment of Debt Loss of extinguishment of debt Loss on extinguishment of debt Other Operating Income (Expense), Net Total other income (expense) Total other expense Net Income (Loss) Available to Common Stockholders, Basic Net loss Net loss attributable to common stockholders Earnings Per Share, Basic and Diluted Net loss per share—basic and diluted Net loss per share—basic and diluted Net loss per share attributable to common stockholders—basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted average shares outstanding—basic and diluted CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY Increase (Decrease) in Stockholders' Equity [Roll Forward] Stockholders' Equity Shares, Outstanding Balance as of end of period (in shares) Balance as of beginning of period (in shares) Stock Issued During Period, Value, New Issues Common stock offering, net of issuance cost and underwriting fees Stock Issued During Period, Shares, New Issues Common stock offering, net of issuance cost and underwriting fees (in shares) Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering including an at-the-market offering. Stock Issued During Period Value New Issues At The Market At-the-market offering, net of sales agent commission and fees Number of new stock issued during the period from the at-the-market offering. Stock Issued During Period Shares New Issues At The Market At-the-market offering, net of sales agent commission and fees (in shares) Adjustments to Additional Paid in Capital, Warrant Issued Issuance of equity classified warrants, net of issuance cost Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Exercise of stock options (in shares) Stock Issued During Period, Value, Employee Stock Purchase Plan Issuance under employee stock purchase plan Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance under employee stock purchase plan (in shares) Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense Net Income (Loss) Attributable to Parent Net loss Expense Related to Distribution or Servicing and Underwriting Fees Underwriters discount and offering costs Sales Commissions and Fees Sales agent commission 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 cash used in operating activities: Depreciation Depreciation Amount of non-cash operating lease cost. Non Cash Operating Lease Non-cash operating lease cost Amount of amortization expense attributable to debt discount and other non-cash interest. Amortization of Debt Discounts And Other Non Cash Interest Amortization of debt discount and other non-cash interest Share-based Compensation Stock-based compensation Increase (Decrease) in Operating Capital [Abstract] Change 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 Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued expenses and other current liabilities The increase (decrease) during the reporting period in lease and noncurrent liabilities. Increase Decrease In Lease And Other Liabilities, Noncurrent Lease liabilities and other long-term liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Cash used in 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 Initial Public Offering Net proceeds Proceeds from common stock offerings, net of underwriters' discounts and offering cost Proceeds from Issuance of Secured Debt Proceeds from venture debt, net of debt issuance costs of $0 and $50 Proceeds from Issuance of Long-term Debt Proceeds from issuance of debt and warrants, net of debt issuance costs of $0 and $3,073 Term loan The amount of cash outflow of principal on venture debt facility. Payment of Principal on Venture Debt Facility Payment of principal and prepayment penalty on venture debt Finance Lease, Principal Payments Payment of principal on finance lease Proceeds from Stock Options Exercised Proceeds from exercise of stock options and issuance of common stock under 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 decrease in cash and restricted cash: Cash and Cash Equivalents, at Carrying Value Cash and restricted cash at end of period Cash and restricted cash at beginning of period Cash and restricted cash at end of period n/a Reconciliation Of Cash And Restricted Cash [Abstract] Reconciliation of cash and restricted cash: Supplemental Cash Flow Information [Abstract] Non-cash investing and financing activities: Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-use asset obtained in exchange for finance lease obligation Future cash outflow to pay for purchases of fixed assets that have occurred with liability recorded in accrued expenses. Capital Expenditures Incurred but Not yet Paid, Accrued Expenses Purchases of property and equipment in accrued expenses Future cash outflow to pay for purchases of fixed assets that have occurred with liability recorded in accounts payable. Capital Expenditures Incurred but Not yet Paid, Accounts Payable Purchases of property and equipment in accounts payable No definition available. Supplemental Disclosure [Abstract] Supplemental disclosure: Interest Paid, Net Cash paid for interest Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-use assets obtained in exchange of operating lease obligations Debt Issuance Costs, Net Unamortized debt discount and issuance cost Debt issuance costs Nature of business Business Description and Basis of Presentation [Text Block] Nature of business Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Inventory Inventory Disclosure [Text Block] Inventory Prepaid Expenses and Other Current Assets Other Current Assets [Text Block] Prepaid Expenses and Other Current Assets Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Property and Equipment, Net Accrued Expenses Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Accrued Expenses Lease Lessee, Operating Leases [Text Block] Lease Debt Debt Disclosure [Text Block] Debt Warrants The entire disclosure for information about preferred stock warrants. Preferred Stock Warrants [Text Block] Warrants Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Fair Value of Financial Instruments Common and Preferred Stock Stockholders' Equity Note Disclosure [Text Block] Common and Preferred Stock Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stock-based Compensation Income Taxes Income Tax Disclosure [Text Block] Income Taxes Commitments and Contingencies. Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Defined Contribution Plan Pension and Other Postretirement Benefits Disclosure [Text Block] Defined Contribution Plan Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Selected Quarterly Financial Data (Unaudited) Subsequent Events Subsequent Events [Text Block] Subsequent Events Consolidation, Policy [Policy Text Block] Principles of consolidation Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Reclassification, Policy [Policy Text Block] Reclassifications Use of Estimates, Policy [Policy Text Block] Use of Estimates Revenue from Contract with Customer [Policy Text Block] Product Revenues, Net Receivables, Policy [Policy Text Block] Accounts Receivable, net The cost of product revenues consists primarily of materials, third-party manufacturing costs, freight and distribution costs, royalty expense, allocation of labor, quality control and assurance, spoilage and other manufacturing overhead costs. Cost of Product Revenues [Policy Text Block] Cost of Product Revenues Concentration Risk, Credit Risk, Policy [Policy Text Block] Cash and Concentration of Credit Risk Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Inventory, Policy [Policy Text Block] Inventory Lessee, Leases [Policy Text Block] Leases Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment, net Intangible Assets, Finite-Lived, Policy [Policy Text Block] Patent Costs Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment of Long-Lived Assets Segment Reporting, Policy [Policy Text Block] Segment Information Research and Development Expense, Policy [Policy Text Block] Research and Development Costs Disclosure of accounting policy for accrued expenses. Accrued Expenses [Policy Text Block] Accrued Expenses Share-based Compensation, Forfeitures [Policy Text Block] Stock-Based Compensation Disclosure of accounting policy for common stock valuation. Common Stock Valuation [Policy Text Block] Common Stock Valuation Prior to the IPO Income Tax, Policy [Policy Text Block] Income Taxes Earnings Per Share, Policy [Policy Text Block] Net Loss per Share Comprehensive Income, Policy [Policy Text Block] Comprehensive Loss New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Schedule of co-pay assistance program (the “co-pay program”), which is intended to provide financial assistance to patients who may or may not be covered by commercial insurance or who opt out of Medicare Part D programs. Product Revenue Provision And Allowance Categories [Table Text Block] Schedule of co-pay assistance program Schedule of Inventory, Current [Table Text Block] Schedule of Inventory Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Schedule of prepaid expenses and other current assets Property, Plant and Equipment [Table Text Block] Schedule of property and equipment, net Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Schedule of accrued expenses Lease, Cost [Table Text Block] Schedule of components of lease expense and related cash flows Finance Lease, Liability, Maturity [Table Text Block] Schedule of maturities of finance lease liability Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Schedule of carrying value of debt Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of maturities of long-term debt Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Schedule of outstanding warrants