Share-based Payment Arrangement [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] Award Type [Domain] Award Type [Domain] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Canceled and forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending balance (in shares) Weighted- Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 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 Canceled and forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Ending balance (in dollars per share) Accounting Policies [Abstract] Schedule of Revenue by Geography Revenue from External Customers by Geographic Areas [Table Text Block] Schedule of Property and Equipment Useful Lives Property, Plant and Equipment [Table Text Block] Earnings Per Share [Abstract] Schedule of Basic and Diluted Net Loss per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Diluted Net Loss per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Warranty term (in years) Standard Product Warranty Term Standard Product Warranty Term Sales credit reserve term (in years) Sales Credit Reserve Period Sales Credit Reserve Period Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-based Payment Arrangement, Option, Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Exercise Price Range [Domain] Exercise Price Range [Domain] $0.84-$2.11 Options Tranche One [Member] Options Tranche One [Member] $3.24-$3.98 Options Tranche Two [Member] Options Tranche Two [Member] $4.32-$5.94 Options Tranche Three [Member] Options Tranche Three [Member] $6.84-$7.92 Options Tranche Four [Member] Options Tranche Four [Member] $17.72-$18.96 Options Tranche Five [Member] Options Tranche Five [Member] $19.02-$22.00 Options Tranche Six [Member] Options Tranche Six [Member] Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Exercise price, lower limit (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Exercise price, upper limit (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Options outstanding, number of shares (in shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Options outstanding, average remaining contractual life (years) Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term Options outstanding, weighted-average exercise price (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price Options vested and exercisable, number of shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Options vested and exercisable, weighted-average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Stock Options Share-based Payment Arrangement, Option [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Black-Scholes option-pricing model assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility, minimum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected volatility, maximum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Risk-free interest rate, minimum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rate, maximum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Dividend yield (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Equity [Abstract] Common stock authorized (in shares) Common Stock, Shares Authorized Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock issued (in shares) Common Stock, Shares, Issued Common stock outstanding (in shares) Common Stock, Shares, Outstanding Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock issued (in shares) Preferred Stock, Shares Issued Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Property and Equipment, Net Schedule of Accrued Liabilities and Other Schedule of Accrued Liabilities [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Debt Disclosure [Abstract] Maturities of Long-term Debt [Abstract] Maturities of Long-term Debt [Abstract] 2020 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2021 Long-term Debt, Maturities, Repayments of Principal in Year Two 2022 Long-term Debt, Maturities, Repayments of Principal in Year Three Total minimum principal payments Long-term Debt, Gross Income Tax Disclosure [Abstract] Deferred Tax Assets Deferred Tax Assets, Net of Valuation Allowance [Abstract] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Research and development credits Deferred Tax Assets, in Process Research and Development Accruals and reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Depreciation and amortization Deferred Tax Assets, Depreciation And Amortization Deferred Tax Assets, Depreciation And Amortization Total deferred tax assets Deferred Tax Assets, Gross Less: Valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax asset, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance The Company and Nature of Business Nature of Operations [Text Block] Uncertain income tax positions [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Balance at beginning of the year Unrecognized Tax Benefits Increases related to current year's tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Balance at end of the year Schedule of Components of Loss Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Components of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Summary of Changes in Valuation Allowance Summary of Valuation Allowance [Table Text Block] Schedule of Uncertain Income Tax Positions Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Term Loan Secured Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Pharmakon Term Loan Pharmakon Term Loan [Member] Pharmakon Term Loan [Member] Debt, Prepayment Penalty, Period [Axis] Debt, Prepayment Penalty, Period [Axis] Debt, Prepayment Penalty, Period [Axis] Debt, Prepayment Penalty, Period [Domain] Debt, Prepayment Penalty, Period [Domain] [Domain] for Debt, Prepayment Penalty, Period [Axis] Prepayment Penalty, 31-48 Months Prepayment Penalty, 31-48 Months [Member] Prepayment Penalty, 31-48 Months [Member] Prepayment Penalty, 49-60 Months Prepayment Penalty, 49-60 Months [Member] Prepayment Penalty, 49-60 Months [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Term loan proceeds Proceeds from Issuance of Long-term Debt Debt issuance costs Debt Issuance Costs, Gross Debt period payment, interest only period Debt Instrument, Periodic Payment, Interest Only Period Debt Instrument, Periodic Payment, Interest Only Period Fixed interest rate (percent) Debt Instrument, Interest Rate, Stated Percentage Debt closing fee percentage (percent) Debt Instrument, Closing Fee Percentage Debt Instrument, Closing Fee Percentage Debt instrument fee amount Debt Instrument, Fee Amount Debt prepayment penalty percentage (percent) Debt Instrument, Prepayment Penalty Percentage Debt Instrument, Prepayment Penalty Percentage Effective interest rate during the period (percent) Debt Instrument, Interest Rate During Period Debt covenant minimum cash balance Debt Instrument, Covenant, Minimum Cash Balance Debt Instrument, Covenant, Minimum Cash Balance Other Liabilities Disclosure [Abstract] Schedule of Warrants Issued and Outstanding Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Schedule of Aggregate Future Minimum Lease Payments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Debt Securities, Available-for-sale Accounts receivable, net of allowance for doubtful accounts of $238 and $263, respectively Accounts Receivable, after Allowance for Credit Loss, Current Inventory Inventory, Net Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Long-term investments Debt Securities, Available-for-sale, Noncurrent Property and equipment, net Property, Plant and Equipment, Net Other non-current 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 liabilities and other Accrued Liabilities, Current Current portion of long-term borrowings Long-term Debt, Current Maturities Total current liabilities Liabilities, Current Long-term borrowings Long-term Debt, Excluding Current Maturities Other long-term liabilities Other Liabilities, Noncurrent TOTAL LIABILITIES Liabilities Commitments and contingencies (Note 6) Commitments and Contingencies STOCKHOLDERS’ EQUITY Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding Preferred Stock, Value, Issued Common stock, $0.0001 par value; 100,000,000 shares authorized; 25,163,803 and 24,450,757 shares issued and outstanding, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) TOTAL STOCKHOLDERS’ EQUITY Stockholders' Equity Attributable to Parent TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity 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 and office equipment Computer And Office Equipment [Member] Computer And Office Equipment [Member] Machinery and equipment Machinery and Equipment [Member] Furniture and fixtures Furniture and Fixtures [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Estimated useful life Property, Plant and Equipment, Useful Life Principal outstanding Less: unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Outstanding debt, net of debt issuance costs Long-term Debt Cash and marketable securities Cash, Cash Equivalents, and Short-term Investments Accumulated deficit Net loss Net Income (Loss) Attributable to Parent Warrants Other Liabilities Disclosure [Text Block] Advertising expenses Advertising Expense Fair Value Disclosures [Abstract] Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Outstanding Borrowings Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Annual Future Minimum Principal Payments Under Loan Agreements Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Debt Covenant EBITDA Targets Schedule Of Debt Covenant EBITDA And Net Revenue Targets [Table Text Block] Debt Covenant EBITDA and Net Revenue Targets [Table Text Block] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Preferred Stock Warrants Warrants Liability [Member] Warrants Liability [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Redeemable Convertible Preferred Stock Redeemable Preferred Stock [Member] Common Stock Common Class A [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] IPO IPO [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Reverse stock split ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Number of shares issued in IPO (in shares) Sale of Stock, Number of Shares Issued in Transaction IPO share price (in dollars per share) Sale of Stock, Price Per Share Net proceeds from IPO Sale of Stock, Consideration Received on Transaction Common stock issued upon conversion of redeemable convertible preferred stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Number of warrants converted (in shares) Class Of Warrant Or Right, Number Of Warrants Or Rights Converted Class of Warrant or Right, Number of Warrants or Rights Converted Warrants to purchase shares of stock (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Adjustments to additional paid-in capital related to warrants Adjustments to Additional Paid in Capital, Warrant Issued Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Standard payment terms per agreements (in days) Revenue Recognition, Standard Payment Terms Revenue Recognition, Standard Payment Terms Borrowings Debt Disclosure [Text Block] Investments, Debt and Equity Securities [Abstract] Marketable Securities [Table] Marketable Securities [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Money market funds Money Market Funds [Member] U.S. treasury securities US Treasury Securities [Member] Corporate bonds Corporate Debt Securities [Member] Commercial paper Commercial Paper [Member] Marketable Securities [Line Items] Marketable Securities [Line Items] Cash equivalents Cash Equivalents, at Carrying Value [Abstract] Carrying Value Cash Equivalents, at Carrying Value Short-term investments Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Amortized Cost Available For Sale Debt Securities, Current, Amortized Cost Basis Available For Sale Debt Securities, Current, Amortized Cost Basis Unrealized Gains Available For Sale Debt Securities, Current, Accumulated Gross Unrealized Gain Before Tax Available For Sale Debt Securities, Current, Accumulated Gross Unrealized Gain Before Tax Unrealized Losses Available For Sale Debt Securities, Current, Accumulated Gross Unrealized Loss Before Tax Available For Sale Debt Securities, Current, Accumulated Gross Unrealized Loss Before Tax Aggregate Fair Value Debt Securities, Available-for-sale, Current Long-term investments Debt Securities, Available For Sale, Noncurrent [Abstract] Debt Securities, Available For Sale, Noncurrent [Abstract] Amortized Cost Available For Sale Debt Securities, Noncurrent, Amortized Cost Basis Available For Sale Debt Securities, Noncurrent, Amortized Cost Basis Unrealized Gains Available For Sale Debt Securities, Noncurrent, Accumulated Gross Unrealized Gain Before Tax Available For Sale Debt Securities, Noncurrent, Accumulated Gross Unrealized Gain Before Tax Unrealized Losses Available For Sale Debt Securities, Noncurrent, Accumulated Gross Unrealized Loss Before Tax Available For Sale Debt Securities, Noncurrent, Accumulated Gross Unrealized Loss Before Tax Aggregate Fair Value Total marketable securities, Amortized Cost Marketable Securities, Amortized Cost Total amortized cost for marketable securities included in cash equivalents and investments. Total marketable securities, Unrealized Gains Marketable Securities, Accumulated Gross Unrealized Gain, Before Tax Marketable Securities, Accumulated Gross Unrealized Gain, Before Tax Total marketable securities, Unrealized Losses Marketable Securities, Accumulated Gross Unrealized Loss, Before Tax Marketable Securities, Accumulated Gross Unrealized Loss, Before Tax Total marketable securities, Aggregate Fair Value Marketable Securities, Fair Value Total aggregate fair value for marketable securities included in cash equivalents and investments. Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options canceled and forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Ending balance (in shares) Options vested and exercisable (in shares) Options vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options canceled and forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Ending balance (in dollars per share) Options vested and exercisable (in dollars per share) Options vested and expected to vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted-Average Remaining Contractual Life and Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted-average remaining contractual life, options outstanding (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted-average remaining contractual life, options vested and exercisable (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Weighted-average remaining contractual life, options vested and expected to vest (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value, options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, options vested and exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Aggregate intrinsic value, options vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Schedule of Marketable Securities Marketable Securities [Table Text Block] Stock-Based Compensation Share-based Payment Arrangement [Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Domestic Tax Authority [Member] State State and Local Jurisdiction [Member] Income Tax Disclosure [Line Items] Operating Loss Carryforwards [Line Items] Decrease in net deferred tax asset position due to change in tax rate Increase (Decrease) In Net Deferred Tax Asset Position, Change In Enacted Tax Rate Increase (Decrease) In Net Deferred Tax Asset Position, Change In Enacted Tax Rate Net operating loss carryforwards Operating Loss Carryforwards Credit carryforwards Tax Credit Carryforward, Amount Limited net operating loss carryforwards Operating Loss Carryforwards, Limited Operating Loss Carryforwards, Limited Accrued interest related to unrecognized tax benefits Unrecognized Tax Benefits, Interest on Income Taxes Accrued Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Follow-on public offering Follow On Public Offering [Member] Follow On Public Offering [Member] Underwriters option Over-Allotment Option [Member] Secondary offering by selling shareholders Secondary Offering [Member] Secondary Offering [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] SeaSpine Affiliated Entity [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Joint development agreement Development Agreement [Member] Development Agreement [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Number of shares sold (in shares) Public offering price (in dollars per share) Net proceeds from sale of stock Approximate monthly payments due per agreement Related Party Transaction, Monthly Payments Due To Related Party Per Agreement Related Party Transaction, Monthly Payments Due To Related Party Per Agreement Term of agreement (in years) Related Party Transaction, Term Of Agreement Related Party Transaction, Term Of Agreement Schedule of Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Options by Range of Exercise Price Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Schedule of Valuation Assumptions Related to Stock Option Awards Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Restricted Stock Unit Activity Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Schedule of Valuation Assumptions Related to ESPP Purchase Rights Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] Schedule of Stock-Based Compensation Expense Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Number of reportable segments Number of Reportable Segments Number of operating segments Number of Operating Segments Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES International Non-US [Member] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Revenue Revenues Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Construction in progress Construction in Progress [Member] Leasehold improvements Leasehold Improvements [Member] Property and Equipment, Net Property and equipment, gross Property, Plant and Equipment, Gross Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Depreciation expense Depreciation ESPP Purchase Rights ESPP Purchase Rights [Member] ESPP Purchase Rights [Member] Expected volatility (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Statement of Cash Flows [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] 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] Stock-based compensation Share-based Payment Arrangement, Noncash Expense Depreciation and amortization Depreciation, Depletion and Amortization Accretion on marketable securities Accretion (Amortization) of Discounts and Premiums, Investments Amortization of debt issuance costs Amortization of Debt Issuance Costs Change in fair value of redeemable convertible preferred stock warrants Fair Value Adjustment of Warrants Loss on sale and disposal of property and 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 Inventory Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities and other Increase (Decrease) in Accrued Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Maturities of marketable securities Proceeds from Sale and Maturity of Marketable Securities Purchases of marketable securities Payments to Acquire Marketable Securities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from initial public offering, net of underwriting discounts and commissions Proceeds from Issuance Initial Public Offering Proceeds from the exercise of common stock options Proceeds from Stock Options Exercised Proceeds from issuance of common stock under employee stock purchase plan Proceeds from Stock Plans Repurchase of unvested early exercised stock options Payments for Repurchase of Common Stock Payments of public offering costs Payments of Stock Issuance Costs Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents at Cash and Cash Equivalents [Abstract] Beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents End of year Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Supplemental disclosure of non-cash information Noncash Investing and Financing Items [Abstract] Conversion of redeemable convertible preferred stock to common stock Conversion of Stock, Amount Converted Conversion of preferred stock warrants to common stock warrants Net Exercise Of Common Warrants Net Exercise of Common Warrants Vesting of early exercised stock options Vesting Of Early Exercised Stock Options Vesting of Early Exercised Stock Options Purchases of property and equipment included in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Public offering costs included in accounts payable Initial Public Offering Costs Incurred But Not Yet Paid Initial Public Offering Costs Incurred But Not Yet Paid Class of Warrant or Right [Table] Class of Warrant or Right [Table] Warrants Issued 3/1/2017 Warrants Issued March First Twenty Seventeen [Member] Warrants Issued March First Twenty Seventeen [Member] Warrants Issued 7/22/2013 Warrants Issued July Twenty-Second Twenty Thirteen [Member] Warrants Issued July Twenty-Second Twenty Thirteen [Member] Warrants Issued 11/26/2014 Warrants Issued November Twenty-Sixth Twenty Fourteen [Member] Warrants Issued November Twenty-Sixth Twenty Fourteen [Member] Warrants Issued 10/20/2015 Warrants Issued October Twentieth Twenty Fifteen [Member] Warrants Issued October Twentieth Twenty Fifteen [Member] Warrants Issued 11/9/2015 Warrants Issued November Ninth Twenty Fifteen [Member] Warrants Issued November Ninth Twenty Fifteen [Member] Warrants Issued 12/22/2016 Warrants Issued December Twenty-Second Twenty Sixteen [Member] Warrants Issued December Twenty-Second Twenty Sixteen [Member] Common Stock Warrants Common Stock Warrants [Member] Common Stock Warrants [Member] Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] Number of Shares Underlying Warrants (in shares) Price per Share (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Fair Value Warrants Outstanding, Fair Value On Date Of Issuance Or Conversion Warrants Outstanding, Fair Value On Date Of Issuance Or Conversion Net Loss Per Share of Common Stock Earnings Per Share [Text Block] Subsequent Events Subsequent Events [Text Block] Common and Preferred Stock Stockholders' Equity Note Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Segments Segment Reporting, Policy [Policy Text Block] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value Measurement, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Marketable Securities Marketable Securities, Policy [Policy Text Block] Accounts Receivable and Allowance for Doubtful Accounts Receivable [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Warranty Program Standard Product Warranty, Policy [Policy Text Block] Medical Device Excise Tax Medical Device Excise Tax Policy [Policy Text Block] Medical Device Excise Tax Policy [Policy Text Block] Research and Development Research and Development Expense, Policy [Policy Text Block] Advertising Expenditures Advertising Cost [Policy Text Block] Loss Contingency Commitments and Contingencies, Policy [Policy Text Block] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Net Loss per Share of Common Stock Earnings Per Share, Policy [Policy Text Block] Comprehensive Loss Comprehensive Income, Policy [Policy Text Block] Public Offering Costs Stockholders' Equity, Policy [Policy Text Block] Warrants Warrants, Classified As Equity And Liabilities [Policy Text Block] Warrants, Classified As Equity And Liabilities [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Aggregate Future Minimum Lease Payments Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2020 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2021 Operating Leases, Future Minimum Payments, Due in Two Years 2022 Operating Leases, Future 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Fromer Chiropractic Inc. 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related costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Unrealized gain on marketable securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Stockholders' equity (deficit), ending balance (in shares) Stockholders' equity (deficit), ending balance 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 Restricted stock units Shares subject to repurchase Share Subject To Repurchase [Member] Share Subject To Repurchase [Member] ESPP purchase rights Employee Stock Purchase Plan Shares [Member] Employee Stock Purchase Plan Shares [Member] Common stock warrants Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock equivalents excluded from the computation of diluted net loss per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Income Taxes Income Tax Disclosure [Text Block] Changes in Valuation Allowance Income Taxes Valuation Allowance [Roll Forward] Income Taxes Valuation Allowance [Roll Forward] Valuation allowance, beginning balance Additions during the period Valuation allowance, ending balance Income Statement [Abstract] Cost of goods sold Cost of Goods and Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Sales and marketing Selling and Marketing Expense Research and development Research and Development Expense General and administrative General and Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income (Loss) Interest and other income (expense), net: Other Income and Expenses [Abstract] Interest income Investment Income, Interest Interest expense Interest Expense Other expense, net Other Nonoperating Income (Expense) Net loss Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Unrealized gain of marketable securities Changes in foreign currency translation Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Net loss per share, basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Weighted-average number of common shares used to compute basic and diluted net loss per share (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Cover page. 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