Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss Award Timing Predetermined Award Timing Predetermined [Flag] Remainder of 2025 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Accounts payable Increase (Decrease) in Accounts Payable Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Warrants outstanding, beginning balance (in shares) Warrants outstanding, ending balance (in shares) Class of Warrant or Right, Outstanding Net loss per share, basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Issuance of common stock related to employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Adjustment to Compensation, Amount Adjustment to Compensation Amount Principles of Consolidation Consolidation, Policy [Policy Text Block] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] ESPP purchase rights Employee Stock Purchase Plan Shares [Member] Employee Stock Purchase Plan Shares [Member] TOTAL STOCKHOLDERS’ EQUITY Stockholders' equity, beginning of period Stockholders' equity, end of period Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Insider Trading Policies and Procedures [Line Items] Stock-based compensation expense Share-Based Payment Arrangement, Expense Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Common stock authorized (in shares) Common Stock, Shares Authorized Construction in progress, surgical placement instrument set Construction in Progress, Surgical Placement Instrument Set [Member] Construction in Progress, Surgical Placement Instrument Set Current assets: Assets, Current [Abstract] TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Recurring Fair Value, Recurring [Member] Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Maximum Maximum [Member] General and administrative General and Administrative Expense [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Schedule of Future Minimum Lease Payments Under Non-Cancelable Operating Leases Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Class of Warrant or Right [Axis] Class of Warrant or Right [Axis] Total operating lease liabilities Operating Lease, Liability U.S. agency bonds US Government Agencies Debt Securities [Member] Changes in foreign currency translation Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Michael Pisetsky, Trading Arrangement, Performance Based Restricted Stock Units [Member] Michael Pisetsky, Trading Arrangement, Performance Based Restricted Stock Units Entity Shell Company Entity Shell Company Other long-term liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Warrants Issued 12/22/2016 Warrants Issued December Twenty-Second Twenty Sixteen [Member] Warrants Issued December Twenty-Second Twenty Sixteen [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Schedule of Performance-based Restricted Stock Unit Activity Arrangement Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Term loan Secured Debt [Member] Operating lease liabilities, current portion Operating Lease, Liability, Current Michael Pisetsky [Member] Michael Pisetsky Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Furniture and fixtures Furniture and Fixtures [Member] Award Type [Axis] Award Type [Axis] Outstanding debt, net of debt issuance costs and unaccreted value of final payment fee Long-Term Debt TOTAL ASSETS Assets Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four 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 Geographical [Domain] Geographical [Domain] Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Expected volatility of peer companies, minimum (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Peer Companies, Minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Peer Companies, Minimum Marketable Securities [Line Items] Marketable Securities [Line Items] Third Amendment Term Loan Third Amendment Term Loan [Member] Third Amendment Term Loan Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] RSUs Restricted stock units Restricted Stock Units (RSUs) [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Marketable securities Assets, Fair Value Disclosure [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Leased assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Outstanding, beginning of period (in shares) Outstanding, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Less: Unamortized debt issuance costs and lender fees Debt Issuance Costs, Net Level 2 Fair Value, Inputs, Level 2 [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Common stock outstanding (in shares) Stockholders' equity, beginning of period (in shares) Stockholders' equity, end of period (in shares) Common Stock, Shares, Outstanding Accounts receivable credit losses Provision Accounts Receivable, Credit Loss Expense (Reversal) Schedule of Marketable Securities Marketable Securities [Table Text Block] Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Warrants Issued 3/1/2017 Warrants Issued March First Twenty Seventeen [Member] Warrants Issued March First Twenty Seventeen [Member] Supplemental disclosure of non-cash information Noncash Investing and Financing Items [Abstract] Interest income Investment Income, Interest Prepayment fee as percentage of aggregate principal amount Debt Instrument, Fee Amount As Percentage Of Aggregate Principal Debt Instrument, Fee Amount As Percentage Of Aggregate Principal United States UNITED STATES Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Michael Pisetsky, Trading Arrangement, Restricted Stock Units [Member] Michael Pisetsky, Trading Arrangement, Restricted Stock Units Issuance of common stock upon exercise of stock options, net of shares withheld Stock Issued During Period, Value, Stock Options Exercised Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Instrument trays Instrument Trays [Member] Instrument Trays Accumulated Deficit Retained Earnings [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Future principal and final fee payments Maturities of Long-Term Debt [Abstract] Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Schedule of Accrued Liabilities and Other Schedule of Accrued Liabilities [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Payment Arrangement [Abstract] Beginning of period End of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income tax provision Income Tax Expense (Benefit) Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Purchases of marketable securities Payments to Acquire Marketable Securities Marketable securities Investments, Fair Value Disclosure Preferred stock issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Options vested and exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Property and equipment, gross Property, Plant and Equipment, Gross Total marketable securities, aggregate fair value Cash, Cash Equivalents, and Short-Term Investments Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Indemnification Agreement Indemnification Agreement [Member] Interest and other income (expense), net: Other Income and Expenses [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Proceeds from the exercise of stock options Proceeds from Stock Options Exercised City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Weighted-average remaining contractual life, options vested and expected to vest Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Accrued liabilities and other Accrued liabilities and other Accrued Liabilities, Current Warrants Issued 11/9/2015 Warrants Issued November Ninth Twenty Fifteen [Member] Warrants Issued November Ninth Twenty Fifteen [Member] Outstanding, beginning of period (in shares) Outstanding, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Class of Warrant or Right [Line Items] Class of Warrant or Right [Line Items] Cash flows from investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Unrecognized compensation cost, stock options Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Aggregate Fair Value Debt Securities, Available-for-Sale, Excluding Accrued Interest Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Total lease expense Lease, Cost Cost of goods sold Cost of Sales [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Summary of Information Related to Lease Expense and Valuation of Lease Assets and Lease Liabilities Lease, Cost [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense Depreciation 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 Money market funds Money market funds Money Market Funds [Member] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property and Equipment, Net Property, Plant and Equipment [Line Items] International Non-US [Member] The Company and Nature of Business Nature of Operations [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Black-Scholes option-pricing model assumptions Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Weighted- Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Total current liabilities Liabilities, Current Individual: Individual [Axis] Research and development Research and Development Expense [Member] Net cash provided by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Prepayment fee, threshold period following closing Debt Instrument, Fee, Threshold Period Following Closing Debt Instrument, Fee, Threshold Period Following Closing Operating lease expense Operating Lease, Cost Accrued compensation and related expenses for employee payroll deductions Other Employee-related Liabilities, Current Plan Name [Domain] Plan Name [Domain] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] First Amendment Term Loan First Amendment Term Loan [Member] First Amendment Term Loan Issuance of common stock upon exercise of stock options, net of shares withheld (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Liability associated with indemnifications Estimated Litigation Liability Purchase commitments related to inventory management and training materials Purchase Obligation Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] U.S. treasury securities U.S. treasury securities US Treasury Securities [Member] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Class of Warrant or Right [Table] Class of Warrant or Right [Table] Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Depreciation and amortization Depreciation, Depletion and Amortization Other non-current assets Other Assets, Noncurrent Accrued royalty Accrued Royalties, Current Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of Future Principal and Final Fee Payments Schedule of Maturities of Long-Term Debt [Table Text Block] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Inventory, finished goods, gross Inventory, Finished Goods, Gross Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving credit facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Expected volatility of common stock, maximum (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Price per Share (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Jeffrey W. Dunn, Trading Arrangement, Common Stock [Member] Jeffrey W. Dunn, Trading Arrangement, Common Stock Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Stock-Based Incentive Compensation Plans Share-Based Payment Arrangement [Text Block] ASSETS Assets [Abstract] Long-term borrowings Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Debt Instrument [Axis] Debt Instrument [Axis] 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 Fair Value Measurement Fair Value Disclosures [Text Block] Credit Facility [Domain] Credit Facility [Domain] STOCKHOLDERS’ EQUITY Equity, Attributable to Parent [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Research and development Research and Development Expense Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Short-term investments Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Inventory, work in process, gross Inventory, Work in Process, Gross Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Schedule of Outstanding Borrowings Schedule of Long-Term Debt Instruments [Table Text Block] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Canceled and forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Options vested and exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Document Quarterly Report Document Quarterly Report Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Number of operating segments Number of Operating Segments Correlation coefficient of peer companies, minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficient Of Peer Companies, Minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficient Of Peer Companies, Minimum Amortization of discount and premium on marketable securities Accretion (Amortization) of Discounts and Premiums, Investments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted-average remaining contractual life, options outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Machinery and equipment Machinery and Equipment [Member] 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 Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Aggregate intrinsic value, options outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Issuance of common stock related to employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name Equity Award [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Aggregate principal amount Debt Instrument, Face Amount Schedule of Stock-Based Compensation Share-Based Payment Arrangement, Activity [Table Text Block] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Dividend yield (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Costs to defend lawsuits or settle claims Litigation Settlement, Fee Expense Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Aggregate Future Minimum Lease Payments Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Jeffrey W. Dunn, Trading Arrangement, Vested Options [Member] Jeffrey W. Dunn, Trading Arrangement, Vested Options Schedule of Accounts Receivable and Allowance for Credit Losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Thereafter Lessee, Operating Lease, Liability, to be Paid, After Year Four Lessee, Operating Lease, Liability, to be Paid, After Year Four Outstanding, beginning of period (in dollars per share) Outstanding, end of period (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 Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Carrying value Cash Equivalents, at Carrying Value Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Sales and marketing Selling and Marketing Expense 2026 Long-Term Debt, Maturity, Year One 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 Financial Instruments [Domain] Financial Instruments [Domain] Maturities of marketable securities Proceeds From Maturity Of Marketable Securities Proceeds From Maturity Of Marketable Securities Income Statement Location [Axis] Statement of Income Location, Balance [Axis] PSUs Performance Shares [Member] Warrants Issued 10/20/2015 Warrants Issued October Twentieth Twenty Fifteen [Member] Warrants Issued October Twentieth Twenty Fifteen [Member] Marketable Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Inventory Increase (Decrease) in Inventories Inventory Inventory, Net Minimum Minimum [Member] Accrued interest writeoff Debt Securities, Available-for-Sale, Accrued Interest Writeoff Less: Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Company Selected Measure Name Company Selected Measure Name Borrowings Debt Disclosure [Text Block] Preferred stock, $0.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Cash paid for amounts included in the measurement of operating lease liabilities Operating Lease, Payments Proceeds from issuance of common stock under employee stock purchase plan Proceeds from Stock Plans Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Common stock, $0.0001 par value; 100,000,000 shares authorized; 43,014,093 and 42,086,477 shares issued and outstanding, respectively Common Stock, Value, Issued Expected volatility of common stock, minimum (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] SVB Term Loan SVB Term Loan [Member] SVB Term Loan Weighted-average number of common shares used to compute diluted net loss per share (in shares) Weighted-average shares used to compute diluted net loss per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Segments Segment Reporting, Policy [Policy Text Block] Commitments and contingencies (Note 6) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Entity Small Business Sales and marketing Selling and Marketing Expense [Member] Schedule of Revenue by Geography Revenue from External Customers by Geographic Areas [Table Text Block] Employee stock purchase program offering period interval (in months) Share-Based Compensation Arrangement By Share-Based Payment Award, Offering Period Interval Share-Based Compensation Arrangement By Share-Based Payment Award, Offering Period Interval Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Proceeds from (repayments of) term loan Proceeds from (Repayments of) Secured Debt Preferred stock outstanding (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report 2018 ESPP 2018 Employee Stock Purchase Plan [Member] A2018 Employee Stock Purchase Plan [Member] Computer and office equipment Computer And Office Equipment [Member] Computer And Office Equipment [Member] Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Canceled and forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Income Taxes Income Tax Disclosure [Text Block] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Balance at beginning of period Balance at end of period Accounts Receivable, Allowance for Credit Loss First-Citizens Term Loan First-Citizens Term Loan [Member] First-Citizens Term Loan Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Net Loss Per Share of Common Stock Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Marketable Securities [Table] Marketable Securities [Table] Additional paid-in capital Additional Paid in Capital Cash equivalents Cash Equivalents, at Carrying Value [Abstract] Variable lease expense Variable Lease, Cost Revenue Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment 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 Name Forgone Recovery, Individual Name Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] 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 Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Purchase price of common stock as a percent of fair market value (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Accrued Liabilities and Other Accrued Liabilities, Current [Abstract] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Correlation coefficient of peer companies, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficient Of Peer Companies, Maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficient Of Peer Companies, Maximum Current liabilities: Liabilities, Current [Abstract] Weighted-Average Remaining Contractual Life and Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Total marketable securities, amortized cost Marketable Securities, Amortized Cost Total amortized cost for marketable securities included in cash equivalents and investments. Geographical [Axis] Geographical [Axis] Net unrealized loss on marketable securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax Jeffrey W. Dunn [Member] Jeffrey W. Dunn Total operating expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Risk-free interest rate, minimum (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Level 1 Fair Value, Inputs, Level 1 [Member] Accrued liabilities and other Increase (Decrease) in Accrued Liabilities Net loss per share, diluted (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net of allowance for credit losses of $911 and $588, respectively Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security Warrants Exercised (in shares) Class of Warrant or Right, Shares, Exercised Class of Warrant or Right, Shares, Exercised 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 Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Gross profit Gross Profit Schedule of Anti-dilutive Common Stock Equivalents Excluded from Computation of Diluted Net Loss per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Final payment fee Debt Instrument, Final Payment Fee Debt Instrument, Final Payment Fee Award Timing Disclosures [Line Items] Principal outstanding Total principal payments Long-Term Debt, Gross Accrued compensation and related expenses Employee-related Liabilities, Current Fair Value, Measurement Frequency [Domain] Measurement Frequency [Domain] Total operating lease payments Lessee, Operating Lease, Liability, to be Paid Extended term Lessee, Operating Lease, Renewal Term Effective interest rate during the period Debt Instrument, Interest Rate During Period Net loss Net loss Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Construction in progress Construction in Progress [Member] Others Other Accrued Liabilities, Current Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions Performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Unrealized loss on marketable securities Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Preferred stock authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Weighted-average remaining contractual life, options vested and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Issuance of common stock upon vesting of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Units Stock Issued During Period, Shares, Restricted Stock Units Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Loss from operations Operating Income (Loss) Line of credit Line of Credit [Member] Accumulated deficit Retained Earnings (Accumulated Deficit) Loss on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Financial Instrument [Axis] Financial Instrument [Axis] Adjustments to reconcile net loss to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] 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] Statement [Table] Statement [Table] Other income (expense) Other Nonoperating Income (Expense) Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Accrued rebates Accrued Rebates, Current Accrued Rebates, Current Schedule of Marketable Securities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Cash and cash equivalents at Cash and Cash Equivalents [Abstract] Common stock equivalents excluded from computation of diluted net loss per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Operating lease liabilities not commenced Unrecorded Unconditional Purchase Obligation All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag 2027 Long-Term Debt, Maturity, Year Two Accrued interest receivable Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss Prime rate adjustment Debt Instrument, Prime Rate Adjustment Debt Instrument, Prime Rate Adjustment Other Commitments [Table] Other Commitments [Table] Termination Date Trading Arrangement Termination Date Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Warrants Issued and Outstanding Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] Common stock warrants Common Stock Warrants [Member] Common Stock Warrants [Member] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Weighted-average number of common shares used to compute basic net loss per share (in shares) Weighted-average shares used to compute basic net loss per share (in shares) Weighted Average Number of Shares Outstanding, Basic Inventory reserve Inventory Write-down Cost of goods sold Cost of Product and Service Sold Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Schedule of Computation of Basic and Diluted Net Loss per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Amortization of debt issuance costs Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Warrants Issued (in shares) Class of Warrant or Right, Shares, Issued Class of Warrant or Right, Shares, Issued Expected volatility of peer companies, maximum (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Peer Companies, Maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Peer Companies, Maximum Construction in progress, software costs Construction in Progress, Software Costs [Member] Construction in Progress, Software Costs Outstanding, beginning of period (in dollars per share) Outstanding, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] 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 2029 Long-Term Debt, Maturity, Year Four Weighted average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Stock options granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Michael Pisetsky, Trading Arrangement, Common Stock [Member] Michael Pisetsky, Trading Arrangement, Common Stock Use of Estimates Use of Estimates, Policy [Policy Text Block] Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Credit losses on investments Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest Remainder of 2025 Long-Term Debt, Maturity, Remainder of Fiscal Year TOTAL LIABILITIES Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Final payment fee, percentage Line of Credit Facility, Commitment Fee Percentage Unpaid purchases of property and equipment Capital Expenditures Incurred but Not yet Paid Revolving credit facility, aggregate principal amount Line of Credit Facility, Maximum Borrowing Capacity Short-term investments Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Operating expenses: Operating Expenses [Abstract] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Warrants Expired (in shares) Class of Warrant or Right, Shares, Expired Class of Warrant or Right, Shares, Expired Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Schedule of Restricted Stock Unit Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Risk-free interest rate, maximum (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Common Stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net decrease in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Accrued professional services Accrued Professional Fees, Current