Document and Entity Information [Abstract] Document and Entity Information [Abstract] 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 Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Inventory Disclosure [Abstract] Shelf life of our finished goods Useful Life, Finished Goods Useful Life, Finished Goods Organization, Consolidation and Presentation of Financial Statements [Abstract] Liquidity Future Liquidity [Text Block] Future Liquidity [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Computer equipment and software Computer Equipment and Software [Member] Computer Equipment and Software [Member] Furniture and fixtures Furniture and Fixtures [Member] Machinery and equipment Machinery and Equipment [Member] Leasehold improvements Leasehold Improvements [Member] Construction in process Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Property, Plant and Equipment, Net Depreciation Depreciation Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock options Employee Stock Option [Member] Common stock warrants Warrant [Member] Convertible preferred stock Convertible Preferred Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Securites excluded from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Payables and Accruals [Abstract] Selling, general and administrative expenses Accrued Selling, General and Administrative, Current Accrued Selling, General and Administrative, Current Research and development expenses Accrued Research and Development, Current Accrued Research and Development, Current Bonus expense Accrued Bonuses, Current Payroll and benefit expenses Accrued Employee Benefits, Current Employee contributions withheld Other Employee-related Liabilities Product revenue allowances Accrued Product Allowances, Current Accrued Product Allowances, Current Interest expense Interest Payable, Current Other Other Accrued Liabilities, Current Accrued Liabilities, Current Accrued Liabilities, Current Raw materials Inventory, Raw Materials, Gross Work-in-process Inventory, Work in Process, Gross Finished goods Inventory, Finished Goods, Gross Total inventory Inventory, Net Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Service Based Stock Options Service Based Stock Options [Member] Service Based Stock Options [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Service-based stock options activity Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Shares outstanding, beginning (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Shares outstanding, ending (in shares) Exercisable at September 30, 2017 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Vested and expected to vest at September 30, 2017 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Service-based stock options weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Beginning balance, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Expired, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Forfeited, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Ending balance, Weighted average exercise price (in dollars per share) Options exercisable, Weighted average exercise price per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Vested and expected to vest, Weighted average exercise price per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Service-based stock options, additional disclosures Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Options outstanding, Weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options exercisable, Weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Vested and expected to vest, Weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Cash and cash equivalents Cash Equivalents, at Carrying Value Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Inventories Inventories [Member] Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of product sales Manufacturing [Member] Manufacturing [Member] Research and development Research and Development Expense [Member] General and administrative General and Administrative Expense [Member] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation expense Allocated Share-based Compensation Expense Statement of Comprehensive Income [Abstract] Net loss Net Income (Loss) Attributable to Parent Other comprehensive (loss) income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Retirement Benefits [Abstract] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Foreign Plan Foreign Plan [Member] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Defined contribution plan, cost Defined Contribution Plan, Cost Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Note Purchase Agreement Note Purchase Agreement [Member] Note Purchase Agreement [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Senior Notes [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Face amount Debt Instrument, Face Amount Front end fees Debt Instrument, Fee Amount, Front End Debt Instrument, Fee Amount, Front End Debt issuance costs Unamortized Debt Issuance Expense Back end fees Debt Instrument, Fee Amount, Back End Debt Instrument, Fee Amount, Back End Long-term debt, net Long-term Debt Research and Development [Abstract] Schedule of Research and Development Arrangement, Contract to Perform for Others [Table] Schedule of Research and Development Arrangement, Contract to Perform for Others [Table] Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type [Domain] Research and Development Arrangement, Contract to Perform for Others, Type [Domain] License Agreement Terms License Agreement Terms [Member] Research and Development Arrangement, Contract to Perform for Others [Line Items] Research and Development Arrangement, Contract to Perform for Others [Line Items] Aggregate cash payments received from license agreement Proceeds from License Fees Received Potential proceeds upon achievement of milestones Research and Development Arrangement, Contract to Perform for Others, Milestone Payments, Maximum Eligible Research and Development Arrangement, Contract to Perform for Others, Milestone Payments, Maximum Eligible Licensing revenues Research and Development Arrangement, Contract to Perform for Others, Compensation Earned Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Accounts receivable, net Accounts Receivable, Net, Current Grants and other receivables Receivables, Net, Current Inventory Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net Other assets Other Assets, Noncurrent Total assets Assets Liabilities and stockholders' equity Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Deferred other income Deferred Revenue, Current Total current liabilities Liabilities, Current Long-term debt, net Total liabilities Liabilities Stockholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock, $0.001 par value; 200,000,000 shares authorized at March 31, 2018 and December 31, 2017; 37,909,058 and 37,802,556 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Long-Term Debt Debt Disclosure [Text Block] Schedule of Antidilutive shares excluded from earnings per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Accrued Expenses Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Equity [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Shares authorized (in shares) Common Stock, Shares Authorized Shares issued (in shares) Common Stock, Shares, Issued Shares outstanding (in shares) Common Stock, Shares, Outstanding Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Schedule of Accrued Expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Fair value of financial instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Revenue recognition Revenue Recognition, Policy [Policy Text Block] Net income (loss) per common share Earnings Per Share, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Note Purchase Agreement - Delayed Draw Notes Note Purchase Agreement - Delayed Draw Notes [Member] Note Purchase Agreement - Delayed Draw Notes [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Unused borrowing capacity Debt Instrument, Unused Borrowing Capacity, Amount Face amount Number of trailing quarters Number Of Trailing Quarters Number Of Trailing Quarters Total debt to trailing four quarter net revenues Total Debt to Trailing Quarter Net Sales Ratio Total Debt to Trailing Quarter Net Sales Ratio Revenue, net Revenue, Net Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Interest rate floor Debt Instrument, Interest Rate Floor Debt Instrument, Interest Rate Floor Upfront fee Debt Instrument Fee, Upfront Fee Debt Instrument Fee, Upfront Fee Exit fee Debt Instrument Fee, Exit Fee Debt Instrument Fee, Exit Fee Interest expense, debt Interest Expense, Debt Amortization of debt discount Amortization of Debt Discount (Premium) Debt amortization period Debt Discount Amortization Period Debt Discount Amortization Period Interest expense, back end fees Interest Expense, Debt, Back End Fees Interest Expense, Debt, Back End Fees Debt issuance costs Debt Issuance Costs, Gross Unamortized debt issuance costs Inventory Inventory Disclosure [Text Block] Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation Share-based Compensation Amortization of debt discount and issuance costs Amortization of Debt Issuance Costs and Discounts Loss on sale of equipment Gain (Loss) on Disposition of Property Plant Equipment Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Grants and other receivables Increase (Decrease) In Grants and Other Receivables Increase (Decrease) In Grants and Other Receivables Prepaid expenses and other assets Increase (Decrease) in Deposits and Other Assets Increase (Decrease) in Deposits and Other Assets Inventory Increase (Decrease) in Inventories Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities Cash used in operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from the sale of Series D preferred stock Proceeds from Issuance of Redeemable Preferred Stock Cash paid for financing costs Payments of Financing Costs Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Effects of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net (decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, cash equivalents and restricted cash at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, cash equivalents and restricted cash at end of period Supplemental disclosure of noncash financing activities: Supplemental Cash Flow Information [Abstract] Deemed dividend Temporary Equity, Dividends, Adjustment Accretion to redemption value Temporary Equity, Accretion to Redemption Value, Adjustment Fixed asset purchases within accounts payable and accrued expenses Deferred Offering Costs WIthin Accounts Payable and Accrued Expenses Deferred Offering Costs WIthin Accounts Payable and Accrued Expenses Financing costs within accounts payable and accrued expenses Other Noncash Income (Expense) Conversion of convertible notes payable and accrued interest into Series C-2 preferred stock Conversion of Stock, Amount Issued Schedule of allocated stock-based compensation expense Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of stock option activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of fair value options using Black-Scholes pricing model Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Basis of Presentation and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] IPO IPO [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Number of shares issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Price per share (usd per share) Sale of Stock, Price Per Share Proceeds from IPO Proceeds from Issuance Initial Public Offering Fees and commissions Sale of Stock, Discounts and Commissions Sale of Stock, Discounts and Commissions Stock issuance costs Payments of Stock Issuance Costs Vote per share Vote Per Share Vote Per Share Dividends declared Common Stock, Dividends, Per Share, Declared Common stock warrants outstanding (in shares) Class of Warrant or Right, Outstanding Common stock warrant exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Property and Equipment Property, Plant and Equipment [Table Text Block] Organization and Description of Business Nature of Operations [Text Block] Stock split conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] AVP-825 License Agreement Research, Development, and Computer Software Disclosure [Text Block] Risk free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Annual dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Fair value of common stock (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Income Statement [Abstract] Net product revenues Revenues Cost of product sales Cost of Goods and Services Sold Gross margin Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research and Development Expense Selling, general and administrative Selling, General and Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income (Loss) Other (income) expense: Nonoperating Income (Expense) [Abstract] Grant and other income Revenue from Grants Interest income Investment Income, Interest Interest expense Interest Expense Foreign currency gains Foreign Currency Transaction Gain (Loss), before Tax Net loss Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Net loss per share of common stock Earnings Per Share [Abstract] basic (in USD per share) Earnings Per Share, Basic diluted (in USD per share) Earnings Per Share, Diluted Weighted average common shares outstanding Earnings Per Share, Basic, Other Disclosures [Abstract] basic (in shares) Weighted Average Number of Shares Outstanding, Basic diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2010 Stock Incentive Plan Two Thousand Ten Stock Incentive Plan [Member] Two Thousand Ten Stock Incentive Plan [Member] 2017 Plan Two Thousand Seventeen Employee Stock Purchase Plan [Member] Two Thousand Seventeen Employee Stock Purchase Plan [Member] Plan options contractual life Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Number of shares authorized under plan (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Unrecognized compensation, estimated weighted-average amortization period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Additional shares authorized each year rate Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Increment Each Year Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Increment Each Year