Subsequent Event [Abstract] Subsequent Event [Abstract] Subsequent Events [Text Block] Subsequent Events [Text Block] Segment Reporting [Abstract] Information about Geographic Areas Segment Reporting Disclosure [Text Block] Accounting Policies [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Net Loss Per Share Earnings Per Share, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Lessee, Leases [Policy Text Block] Lessee, Leases [Policy Text Block] Equity [Abstract] 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Term Loan Agreement Term Loan Agreement [Member] Term Loan Agreement [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] At The Market Equity Offering At The Market Equity Offering [Member] At The Market Equity Offering [Member] Public Stock Offering Public Stock Offering [Member] Public Stock Offering [Member] Selling Stockholder [Member] Selling Stockholder [Member] Selling Stockholder [Member] Over-Allotment Option [Member] Over-Allotment Option [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Debt Instrument, Redemption Price, Percentage Debt Instrument, Redemption Price, Percentage Upfront Fee Of Aggregate Principal Amount, Percentage Upfront Fee Of Aggregate Principal Amount, Percentage Upfront Fee Of Aggregate Principal Amount, Percentage Proceeds from sale of common stock, net Proceeds from Issuance of Common Stock Shares sold in offering Sale of Stock, Number of Shares Issued in Transaction Total gross proceeds from stock offering Sale Of Stock, Gross Consideration Received On Transaction Sale Of Stock, Gross Consideration Received On Transaction Aggregate net proceeds from stock offering Sale of Stock, Consideration Received on Transaction Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Description of Business Business Description and Basis of Presentation [Text Block] Leases [Abstract] Operating lease cost Operating Lease, Cost Operating cash flows from operating leases Operating Lease, Payments Weighted Average Remaining Lease Term (years) Operating Lease, Weighted Average Remaining Lease Term Weighted Average Discount Rate Operating Lease, Weighted Average Discount Rate, Percent Earnings Per Share [Abstract] Summary of Shares Underlying Outstanding Options and Warrants were Excluded from Computation of Basic and Diluted Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Corporate debt securities Corporate Debt Securities [Member] U.S. government-related debt securities US Government Agencies Debt Securities [Member] Asset-backed Securities [Member] Asset-backed Securities [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Amortized cost Available-for-sale Securities, Amortized Cost Basis Gross unrealized gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross unrealized losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair value Available-for-sale Securities, Current Significant Accounting Policies [Table] Significant Accounting Policies [Table] A summary of information pertaining to the Basis of Presentation and Summary of Significant Accounting Policies disclosure as a whole for which no other established gaap taxonomy identified hypercube is available. Maximum Maximum [Member] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Extended line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Extended warranty period Extended Product Warranty Period The extended product warranty liability period. Does not include increases or decreases in the standard warranty liability. Standard warranty period Standard Product Warranty Period The standard product warranty liability period. Does not include increases or decreases in an extended warranty liability. Risks and Uncertainties [Abstract] Concentration of Risks Concentration Risk Disclosure [Text Block] Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Total product and service revenue Product And Service [Member] Product And Service [Member] Collaboration revenue Collaboration [Member] Collaboration [Member] Statement [Line Items] Statement [Line Items] Revenue: Revenues [Abstract] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Total revenue Revenues Costs and expenses: Costs and Expenses [Abstract] Cost of product and service revenue Cost of Revenue Research and development Research and Development Expense Selling, general and administrative Selling, General and Administrative Expense Total costs and expenses Costs and Expenses Loss from operations Operating Income (Loss) Other income (expense): Other Income and Expenses [Abstract] Interest income Investment Income, Interest Interest expense Investment Income, Investment Expense Other income (expense), net Other Nonoperating Income (Expense) Total other income (expense), net Nonoperating Income (Expense) Net loss before provision for income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for income tax Income Tax Expense (Benefit) Net loss Net Income (Loss) Attributable to Parent Net loss per share - basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Weighted average shares used in computing basic and diluted net loss per share (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Concentration Risk [Table] Concentration Risk [Table] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Lam Research Corporation Lam Research Corporation [Member] Lam Research Corporation Merck Sharp & Dohme Corp. Merck Sharp And Dohme Corporation [Member] Merck Sharp And Dohme Corporation [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Total revenue Sales Revenue, Net [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk percentage Concentration Risk, Percentage Deferred Revenue Disclosure [Abstract] Collaboration Agreements Collaborative Arrangement Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Inventory Disclosure [Abstract] Inventory Inventory Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Money market fund Money Market Funds [Member] 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] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Short-term investments Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value Financial Instruments, Owned, Mortgages, Mortgage-backed and Asset-backed Securities, at Fair Value Total Assets, Fair Value Disclosure Operating Leases Lessee, Operating Leases [Text Block] Debt Disclosure [Abstract] Long-term Debt Debt Disclosure [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Debt Instrument [Line Items] Borrowings under term loan agreements Loans Payable Borrowings Under Term Loan Agreements Borrowings Under Term Loan Agreements Borrowings Under Term Loan Agreements Paid-in-Kind Interest Paid-in-Kind Interest Unamortized debt discounts Unamortized Debt Issuance Expense Long-term debt, net of discounts Long-term Debt and Capital Lease Obligations Revenue from Contract with Customer [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Total Products And Services Total Products And Services [Member] Total Products And Services [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Operating Leases, After Adoption of 842: Operating Lease Liabilities, Payments Due [Abstract] Remainder of 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total future minimum lease payments Lessee, Operating Lease, Liability, Payments, Due Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total Operating Lease, Liability Operating Leases, Before Adoption of 842: Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2020 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years 2023 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future minimum lease payments Operating Leases, Future Minimum Payments Due Statement of Financial Position [Abstract] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Calculated under Revenue Guidance in Effect before Topic 606 Calculated under Revenue Guidance in Effect before Topic 606 [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Total revenue Net loss Deferred revenue, current portion Deferred Revenue, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Statement of Comprehensive Income [Abstract] Change in unrealized gain (loss) on short-term investments Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, Net, Current Inventory, net Inventory, Net Prepaid expenses and other Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Operating lease right-of-use assets Operating Lease, Right-of-Use Asset 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 liabilities Accrued Liabilities, Current Accrued compensation and other employee benefits Employee-related Liabilities, Current Customer deposits Customer Deposits, Current Deferred rent, current portion Deferred Rent Credit, Current Operating lease liabilities, current portion Operating Lease, Liability, Current Total current liabilities Liabilities, Current Deferred revenue, net of current portion Deferred Revenue, Noncurrent Deferred rent and other long-term liabilities Deferred Rent Credit And Liabilities, Other Than Long-term Debt, Noncurrent Deferred Rent Credit And Liabilities, Other Than Long-term Debt, Noncurrent Long-term debt, net of discounts Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Total liabilities Liabilities Commitment and contingencies Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.0001 par value, 15,000 shares authorized; none issued Preferred Stock, Value, Issued Common stock, $0.0001 par value, 150,000 shares authorized; 35,044 and 30,913 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated other comprehensive income (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 Components of Borrowings, Including Current Portion Schedule of Debt [Table Text Block] Scheduled Future Principal Payments under Outstanding Debt Obligations Schedule of Maturities of Long-term Debt [Table Text Block] Raw materials Inventory, Raw Materials, Net of Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Inventory, net Classification of Revenue by Geography Revenue from External Customers by Geographic Areas [Table Text Block] Maturing in one year or less Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value Maturing in one to three years Available For Sale Securities Debt Maturities After One Through Three Years Fair Value Available for sale securities debt maturities after one through three years fair value. Total available-for-sale securities Debt Securities, Available-for-sale Short-term Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Number of sales forces Number Of Sales Forces Number of Sales Forces Number of reportable segment Number of Reportable Segments Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Schedule of Collaborative Arrangements and Non-collaborative Arrangement Transactions [Table] Type of Arrangement and Non-arrangement Transactions [Axis] Type of Arrangement and Non-arrangement Transactions [Axis] Arrangements and Non-arrangement Transactions [Domain] Arrangements and Non-arrangement Transactions [Domain] Collaborative Arrangement Collaborative Arrangement [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Celgene Corporation Celgene Corporation [Member] Celgene Corporation [Member] Deferred Revenue Arrangement Type [Axis] Deferred Revenue Arrangement Type [Axis] Deferred Revenue [Domain] Deferred Revenue [Domain] Upfront Payment Arrangement Up-front Payment Arrangement [Member] Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] Maximum amount of royalties payable (ratio) Maximum Amount Of Royalties Payable, Ratio To License And Service Revenue Maximum Amount Of Royalties Payable, Ratio To License And Service Revenue Maximum number of employees Reimbursement Of Counterparty Costs, Maximum Number Of Employees Reimbursement Of Counterparty Costs, Maximum Number Of Employees Number of warrants, outstanding Class of Warrant or Right, Outstanding Exercise price of warrants Exercise Price Of Common Stock Warrants Exercise Price Of Common Stock Warrants Issued warrants, value Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants Proceeds from collaborators Proceeds from Collaborators Deferred revenue recorded under collaboration agreement Deferred Revenue Estimated deferred revenue recognized within one year Collaborative agreement period Collaborative Agreement Period Of Contract Collaborative Agreement Period Of Contract Customer deposits Other Liabilities, Current nstg_ReimbursementOfCounterpartyCosts nstg_ReimbursementOfCounterpartyCosts nstg_ReimbursementOfCounterpartyCosts Amounts due for services provided Collaborative Agreement, Accrued Cost Collaborative Agreement, Accrued Cost Payments for services provided Payments For Collaborative Agreement Payments For Collaborative Agreement Number of warrants exercised Class Of Warrant Or Right, Number Of Warrants Or Rights Exercised Class Of Warrant Or Right, Number Of Warrants Or Rights Exercised Maximum success-based milestone payments Revenue Recognition, Milestone Method, Revenue Recognized Collaboration agreement upfront payment Deferred Revenue, Additions Americas Americas [Member] Europe and Middle East Europe And Middle East [Member] Europe And Middle East [Member] Asia Pacific Asia Pacific [Member] Instruments Product, Instruments [Member] Product, Instruments [Member] Consumables Product, Consumables [Member] Product, Consumables [Member] In vitro diagnostic kits Product, In Vitro Diagnostic Kits [Member] Product, In Vitro Diagnostic Kits [Member] Total product revenue Product [Member] Service revenue Service [Member] Net Loss Per Share Earnings Per Share [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] 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] Options to purchase common stock Employee Stock Option [Member] Restricted stock units Restricted Stock Units (RSUs) [Member] Common stock warrants Warrant [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Statement of Cash Flows [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Right-of-use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Operating activities Net Cash Provided by (Used in) Continuing Operations [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] Depreciation and amortization Depreciation, Depletion and Amortization Amortization of right-of-use assets Operating Lease, Right-Of-Use Assets, Amortization Operating Lease, Right-Of-Use Assets, Amortization Stock-based compensation expense Allocated Share-based Compensation Expense Amortization of premium on short-term investments Investment Income, Net, Amortization of Discount and Premium Amortization of deferred financing costs Interest Accrued On Long Term Notes Interest expense incurred, not yet paid, on all other long-term debt, which may include (1) interest on long-term notes, and (2) amortization of issuance costs not otherwise separately disclosed. Conversion of accrued interest to long-term debt Conversion Of Accrued Interest To Long Term Debt Conversion Of Accrued Interest To Long Term Debt Provision for bad debts Provision for Doubtful Accounts Inventory Write-down Inventory Write-down 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 Increase (Decrease) in Accrued Liabilities Accrued compensation and other employee benefits Increase (Decrease) in Employee Related Liabilities Customer deposits Increase (Decrease) in Customer Deposits Deferred revenue Increase (Decrease) in Deferred Revenue Operating lease liabilities Increase (Decrease) In Operating Lease Liabilities Increase (Decrease) In Operating Lease Liabilities Deferred rent and other liabilities Increase (Decrease) In Deferred Rent And Other Operating Liabilities Increase (Decrease) in Deferred Rent and Other Operating Liabilities Net 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 Proceeds from sale of short-term investments Proceeds from Sale of Short-term Investments Proceeds from maturity of short-term investments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Purchases of short-term investments Payments to Acquire Available-for-sale Securities Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of common stock warrants Proceeds from Issuance of Warrants Tax withholdings related to net share settlements of restricted stock units Restricted Stock, Value, Shares Issued Net of Tax Withholdings Proceeds from issuance of common stock for employee stock purchase plan Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options Proceeds from exercise of stock options Proceeds from Stock Options Exercised Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash, cash equivalents Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value [Abstract] Beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents End of period Cash and cash equivalents Company's Available-for-Sale Securities by Level within Fair Value Hierarchy Fair Value, by Balance Sheet Grouping [Table Text Block] Statement of Changes in Stockholders' Equity [Abstract] Statement of Changes in Stockholders' Equity [Abstract] Accumulated Deficit Retained Earnings [Member] Other Comprehensive Loss AOCI Attributable to Parent [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Stock Issued During Period, Value, New Issues Stock Issued During Period, Value, New Issues Shares, Outstanding Shares, Outstanding Stockholders' Equity Attributable to Parent Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Adjustments to Additional Paid in Capital, Warrant Issued Adjustments to Additional Paid in Capital, Warrant Issued Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock Issued During Period, Value, Stock Options Exercised Stock Issued During Period, Value, Stock Options Exercised Stock Issued During Period, Shares, Employee Stock Purchase Plans Stock Issued During Period, Shares, Employee Stock Purchase Plans Stock Issued During Period, Value, Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Value, Restricted Stock Award, Gross Stock Issued During Period, Value, Restricted Stock Award, Gross Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Remainder of 2018 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five Long-term Debt, Maturities, Repayments of Principal after Year Five Long-term Debt, Maturities, Repayments of Principal after Year Five Total long-term debt and lease financing obligations Long-term Debt Cumulative impact of new standard Contract liabilities Contract with Customer, Liability Performance obligation satisfied in previous period Contract with Customer, Performance Obligation Satisfied in Previous Period Cash payments received form customers Contract With Customer, Liability, Increase From Cash Receipts Contract With Customer, Liability, Increase From Cash Receipts Contract assets Contract with Customer, Asset, Net Components of Lease Cost and Other Information Lease, Cost [Table Text Block] Schedule of Future Minimum Lease Payments, After Adoption Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Lease Payments, Before Adoption Lessee, Operating Lease, Liability, Maturity [Table Text Block] Short-Term Investments Available-for-Sale Securities Available-for-sale Securities [Table Text Block] Fair Values of Available-for-Sale Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Document And Entity Information [Abstract] Document And Entity Information. Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol 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 Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Europe & Middle East EMEA [Member] Line of Credit Facility [Table] Line of Credit Facility [Table] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period One [Member] Debt Instrument, Redemption, Period Two [Member] Debt Instrument, Redemption, Period Two [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Prime Rate Prime Rate [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] CRG Servicing LLC Amended And Restated Loan Agreement [Member] CRG Servicing LLC Amended And Restated Loan Agreement [Member] CRG Servicing LLC Amended And Restated Loan Agreement [Member] Secured Revolving Loan Facility Secured Revolving Loan Facility [Member] Secured Revolving Loan Facility [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of Credit Facility, Commitment Fee Percentage Line of Credit Facility, Commitment Fee Percentage Interest Expense Interest Expense Credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Variable rate Debt Instrument, Basis Spread on Variable Rate Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt Unused borrowing capacity, amount Debt Instrument, Unused Borrowing Capacity, Amount Percentage of accrue interest Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Percentage of deferred payment Deferred Payment Obligation Accrued Interest Rate Payment-in-kind percentage as agreed upon in the financing agreement to defer interest payments. Interest deferral period Debt Instrument, Interest Deferral Period Debt Instrument, Interest Deferral Period Long term liability Long-term Line of Credit, Noncurrent Minimum liquidity Minimum Liquidity Covenant Amount Minimum Liquidity Covenant Amount Annual revenue requirements Long-term Line of Credit Long-term Line of Credit Proceeds from (Repayments of) Debt Proceeds from (Repayments of) Debt Long-term Debt, Gross Long-term Debt, Gross Repayments of Debt Repayments of Debt Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Warrants Issued with Debt Warrants Issued with Debt Warrants Issued with Debt Class of Warrant or Right, Exercise Price of Warrants or Rights Class of Warrant or Right, Exercise Price of Warrants or Rights Class Of Warrant Or Right, Number Of Securities Called By Warrants Or Rights, Future Draw, Percentage Of Diluted Shares Outstanding Class Of Warrant Or Right, Number Of Securities Called By Warrants Or Rights, Future Draw, Percentage Of Diluted Shares Outstanding Class Of Warrant Or Right, Number Of Securities Called By Warrants Or Rights, Future Draw, Percentage Of Diluted Shares Outstanding Premium on Exercise Price of Additional Warrants, Debt Premium on Exercise Price of Additional Warrants, Debt Premium on Exercise Price of Additional Warrants, Debt Warrants Not Settleable in Cash, Fair Value Disclosure Warrants Not Settleable in Cash, Fair Value Disclosure Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Line of Credit Facility, Current Borrowing Capacity Line of Credit Facility, Current Borrowing Capacity