Equity [Abstract]
Schedule Of Equity [Table]
Schedule Of Equity [Table]
Schedule of equity.
Class of Stock
Class of Stock [Axis]
Class of Stock
Class of Stock [Domain]
Convertible preferred stock
Convertible Preferred Stock [Member]
Series A Convertible Preferred Stock
Series A Convertible Preferred Stock [Member]
Series A convertible preferred stock.
Series C Convertible Preferred Stock
Series C Convertible Preferred Stock [Member]
Series C convertible preferred stock.
Series D Convertible Preferred Stock
Series D Convertible Preferred Stock [Member]
Series D convertible preferred stock.
Equity [Line Items]
Equity [Line Items]
Equity.
Convertible preferred stock outstanding (shares)
Temporary Equity, Shares Outstanding
Number of common stock issuable upon conversion of convertible preferred stock (shares)
Convertible Preferred Stock, Shares Issued upon Conversion
Conversion price per share (USD per share)
Temporary Equity Conversion Price Per Share
Temporary equity conversion price per share.
Fair Value Disclosures [Abstract]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Income Tax Disclosure [Abstract]
Income Taxes
Income Tax Disclosure [Text Block]
Statement of Financial Position [Abstract]
Common stock, par value (USD per share)
Common Stock, Par or Stated Value Per Share
Common stock, shares authorized (shares)
Common Stock, Shares Authorized
Common stock, shares issued (shares)
Common Stock, Shares, Issued
Common stock, shares outstanding (shares)
Common Stock, Shares, Outstanding
Prepaid Expense and Other Assets, Current [Abstract]
Schedule of Prepaid Expenses and Other Current Assets
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Property, Plant and Equipment, Type
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type
Property, Plant and Equipment, Type [Domain]
Computer and office equipment
Computer And Office Equipment [Member]
Computer and office equipment.
Lab equipment
Lab Equipment [Member]
Lab equipment.
Service equipment placed at customer sites
Service Equipment [Member]
Service equipment placed at customer sites.
Leasehold improvements
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Property and equipment, gross
Property, Plant and Equipment, Gross
Less accumulated depreciation and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Property and equipment, net
Property, Plant and Equipment, Net
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies [Table]
Commitments And Contingencies [Table]
Commitments and contingencies.
Scenario
Scenario [Axis]
Scenario, Unspecified
Scenario, Unspecified [Domain]
Scenario, Forecast
Scenario, Forecast [Member]
Commitments and Contingencies [Line Items]
Commitments And Contingencies [Line Items]
Commitments and contingencies.
Rent expense
Operating Leases, Rent Expense, Net
Amortization of the leasehold incentive obligation
Amortization of Lease Incentives
Sublease income
Operating Leases, Income Statement, Sublease Revenue
Amount of royalty expense paid
Royalty Expense
Annual future minimum royalty payments
Annual Future Minimum Royalty Payments
Annual future minimum royalty payments.
Contractual commitment with supplier to purchase products remainder of fiscal year
Purchase Obligation, Future Minimum Payments, Remainder of Fiscal Year
Initial purchase period
Purchase Obligation, Initial Purchase Period
Purchase Obligation, Initial Purchase Period
Termination period
Purchase Obligation, Contract Termination Period
Purchase Obligation, Contract Termination Period
Statement of Cash Flows [Abstract]
Operating activities:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net loss
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Adjustments to reconcile net loss to net cash used by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation
Depreciation, Depletion and Amortization
Change in fair value of preferred stock warrants and expirations
Fair Value Adjustment of Warrants
Interest payment-in-kind
Paid-in-Kind Interest
Stock-based compensation
Share-based Compensation
Provision for bad debt expense
Provision for Doubtful Accounts
Accretion of debt discount
Accretion Of Debt Discount
Accretion of debt discount.
Loss on debt extinguishment
Gain (Loss) on Extinguishment of Debt
Long-term debt prepayment fees
Long-Term Debt Prepayment Fees
Long-Term Debt Prepayment Fees
Employee stock purchase plan compensation
Employee Stock Purchase Plan, Compensation Expense
Employee Stock Purchase Plan, Compensation Expense
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 current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Accounts payable
Increase (Decrease) in Accounts Payable
Accrued expenses and other liabilities
Increase (Decrease) in Accrued Liabilities 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
Net cash used in investing activities
Net Cash Provided by (Used in) Investing Activities
Financing activities:
Net Cash Provided by (Used in) Financing Activities [Abstract]
Repayment of long-term debt
Repayments of Notes Payable
Proceeds from issuance of long-term debt, net of issuance costs
Proceeds from Debt, Net of Issuance Costs
Proceeds from issuance of convertible note, net of issuance costs
Proceeds from Convertible Debt
Proceeds from borrowing on line of credit
Proceeds from Lines of Credit
Repayments of borrowing from line of credit
Repayments of Lines of Credit
Proceeds from sale of common stock, net of offering costs
Proceeds from Issuance of Common Stock
Proceeds from option exercises
Proceeds from Stock Options Exercised
Net cash provided by financing activities
Net Cash Provided by (Used in) Financing Activities
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 beginning of period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations
Cash and cash equivalents at end of period
Supplemental schedule on non-cash transactions:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Property and equipment costs incurred but not paid included in accounts payable and accrued expenses
Capital Expenditures Incurred but Not yet Paid
Transfer of instruments from property and equipment into inventory
Transfer Of Instruments To Property And Equipment From Inventory
Transfer of instruments to property and equipment from inventory.
Fair value of warrants issued with debt classified as a liability
Fair Value Of Warrants Issued With Debt Classified As Liability
Fair value of warrants issued with debt classified as a liability.
Fair value of stock issued with debt classified as a liability
Fair Value Of Stock Issued With Debt Classified As Liability
Fair Value Of Stock Issued With Debt Classified As Liability
Final payment due in connection with the repayment of debt classified in other long-term liabilities
Final Payment Fee Due In Connection With Repayment Of Debt Classified Within Other Long Term Liabilities
Final payment fee due in connection with the repayment of debt classified within other long-term liabilities.
Deferred equity issuance costs in accounts payable and accrued liabilities
Deferred equity issuance costs in accounts payable and accrued liabilities
Deferred equity issuance costs in accounts payable and accrued liabilities.
Debt issuance costs incurred but not paid
Debt issuance costs incurred but not paid
Debt issuance costs incurred but not paid.
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Long-term Debt, Type
Long-term Debt, Type [Axis]
Long-term Debt, Type
Long-term Debt, Type [Domain]
MidCap Financial CSA
Mid Cap Financial Credit And Security Agreement [Member]
MidCap financial credit and security agreement.
Innovatus LSA
Innovatus Loan Agreement [Member]
Innovatus Loan Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Term loan face value
Debt Instrument, Face Amount
Fair value of warrant
Fair Value Of Warrant
Fair value of warrant.
Stock discount issued
Fair Value of Stock Discount
Fair Value of Stock Discount
End of term charge
Debt Instrument, Unamortized Discount, Current
Capitalized debt issuance costs
Debt Issuance Costs, Net
Interest payment-in-kind
Long Term Debt, Paid In Kind Interest
Long Term Debt, Paid In Kind Interest
Accretion of debt issuance costs and end of term charge
Accretion Of Debt Issuance Costs And End Of Term Charge
Accretion of debt issuance costs and end of term charge.
Accretion of warrant fair value
Accretion Of Warrant Fair Value
Accretion of warrant fair value.
Balance
Long-term Debt
Less current portion
Long-term Debt, Current Maturities
Long-term debt
Long-term Debt, Excluding Current Maturities
Non-cash interest expense related to debt discount amortization and accretion
Amortization of Debt Issuance Costs and Discounts
Prepayment to supplier
Prepaid Supplies
Prepaid insurance
Prepaid Insurance
Other current assets
Other Assets, Current
Total
Prepaid Expense and Other Assets, Current
Western Alliance LSA
Western Alliance Loan And Security Agreement [Member]
Western Alliance Loan and Security Agreement.
Lender Name
Lender Name [Axis]
Line of Credit Facility, Lender
Line of Credit Facility, Lender [Domain]
Credit Facility
Credit Facility [Axis]
Credit Facility
Credit Facility [Domain]
Tranche 1
Line Of Credit Term Loan Tranche One [Member]
Line of credit term loan tranche one.
Tranche 2
Line Of Credit Term Loan Tranche Two [Member]
Line of credit term loan tranche two.
Tranche 3
Line Of Credit Term Loan Tranche Three [Member]
Line of credit term loan tranche three.
Debt Instrument, Redemption, Period
Debt Instrument, Redemption, Period [Axis]
Debt Instrument, Redemption, Period
Debt Instrument, Redemption, Period [Domain]
First Year
Debt Instrument, Redemption, Period One [Member]
Second Year
Debt Instrument, Redemption, Period Two [Member]
Thereafter
Debt Instrument Redemption Period Thereafter [Member]
Debt instrument redemption period thereafter.
Balance Sheet Location
Balance Sheet Location [Axis]
Balance Sheet Location
Balance Sheet Location [Domain]
Other Long-term Liabilities
Other Noncurrent Liabilities [Member]
Debt Instrument
Debt Instrument [Axis]
Debt Instrument, Name
Debt Instrument, Name [Domain]
Term Loan
Term Loan [Member]
Term Loan.
Series D-1 Convertible Preferred Stock
Series D One Convertible Preferred Stock [Member]
Series D-1 convertible preferred stock.
Measurement Input Type
Measurement Input Type [Axis]
Measurement Input Type
Measurement Input Type [Domain]
Expected life (in years)
Measurement Input, Expected Term [Member]
Risk-free interest rate
Measurement Input, Risk Free Interest Rate [Member]
Volatility
Measurement Input, Price Volatility [Member]
Term loan facility available
Line of Credit Facility, Maximum Borrowing Capacity
Term loan facility borrowed from Tranche 1
Line of Credit Facility, Current Borrowing Capacity
Repayment of outstanding term loan
Repayments of Debt
Annual interest rate bears
Debt Instrument, Basis Spread on Variable Rate
LIBOR subject to floor rate
Debt Instrument London Interbank Offered Rate Subject To Floor Rate
Debt instrument london interbank offered rate subject to floor rate.
Debt instrument maturity period
Debt Instrument Maturity Period
Debt instrument maturity period.
Debt instrument interest only portion maturity period
Debt Instrument Interest Only Portion Maturity Period
Debt instrument interest only portion maturity Period.
Debt instrument principal and interest maturity period
Debt Instrument Principal And Interest Payment Maturity Period
Debt instrument principal and interest payment maturity period.
Debt issuance fees paid
Payments of Debt Issuance Costs
Prepayment fee percentage
Debt Instrument Prepayment Fee Percent
Debt instrument prepayment fee percent.
Prepayment fee
Debt Instrument, Fee Amount
Debt discount charge
Debt Instrument, Unamortized Discount, Noncurrent
Shares called by warrant (in shares)
Class of Warrant or Right, Number of Securities Called by Warrants or Rights
Warrants to purchase, Fair value preferred stock
Class of Warrant or Right, Exercise Price of Warrants or Rights
Debt discount and amortization of interest expense
Debt Instrument, Unamortized Discount
Fair value assumptions term
Fair Value Assumptions Expected Life Term
Fair value assumptions expected life term.
Fair value assumptions
Alternative Investment, Measurement Input
Shares of common stock
Class of Warrant or Right, Outstanding
Additional amount invested in term loan facility
Line Of Credit Facility Additional Borrowing Capacity
Line of credit facility additional borrowing capacity.
Term A-1 Loan
Term A-1 Loan [Member]
Term A-1 Loan [Member]
Term A-2 Loan
Term A-2 Loan [Member]
Term A-2 Loan [Member]
Revolver
Revolver [Member]
Revolver [Member]
PIK
Payment in Kind (PIK) Note [Member]
Line of Credit
Line of Credit [Member]
Debt Instrument, Payment Terms
Debt Instrument, Payment Terms [Axis]
Debt Instrument, Payment Terms [Axis]
Debt Instrument, Payment Terms
Debt Instrument, Payment Terms [Domain]
[Domain] for Debt Instrument, Payment Terms [Axis]
On or prior to March 14, 2020
Debt Instrument, Payment Terms, Period One [Member]
Debt Instrument, Payment Terms, Period One [Member]
After March 14, 2020 but prior to March 14, 2021
Debt Instrument, Payment Terms, Period Two [Member]
Debt Instrument, Payment Terms, Period Two [Member]
After March 14, 2021 but prior to March 14, 2022
Debt Instrument, Payment Terms, Period Three [Member]
Debt Instrument, Payment Terms, Period Three [Member]
Thereafter
Debt Instrument, Payment Terms, Period Four [Member]
Debt Instrument, Payment Terms, Period Four [Member]
Common Stock
Common Stock [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Variable Rate [Domain]
Variable Rate [Domain]
Prime Rate
Prime Rate [Member]
Cash rate
Debt Instrument, Interest Rate, Cash Rate
Debt Instrument, Interest Rate, Cash Rate
Discounted cash rate
Debt Instrument, Interest Rate, Discounted Cash Rate
Debt Instrument, Interest Rate, Discounted Cash Rate
Percent of original principal amount borrowed
Debt Instrument, Percent of Original Principal Amount Borrowed
Debt Instrument, Percent of Original Principal Amount Borrowed
End of term charge
Maximum credit card indebtedness
Debt Instrument, Covenant, Maximum Credit Card Indebtedness
Debt Instrument, Covenant, Maximum Credit Card Indebtedness
Number of shares issued (in shares)
Sale of Stock, Number of Shares Issued in Transaction
Price per share (USD per share)
Sale of Stock, Price Per Share
Proceeds from issuance of common stock
Sale of Stock, Consideration Received on Transaction
Issuance price and fair value
Debt Instrument, Fair Value Disclosure
Warrants to purchase shares issued
Warrants To Purchase Shares Issued
Warrants to purchase shares issued.
Term
Class of Warrant or Right, Term
Class of Warrant or Right, Term
Debt discount and amortization of interest expense
Amortization of Debt Issuance Costs
Effective percentage
Debt Instrument, Interest Rate, Effective Percentage
Repayments of borrowing from line of credit
Term loans borrowed
Long-term Debt, Gross
Line of credit
Line of Credit, Current
Property and Equipment, net
Property, Plant and Equipment Disclosure [Text Block]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Measurement Frequency
Measurement Frequency [Axis]
Fair Value, Measurement Frequency
Fair Value, Measurement Frequency [Domain]
Fair Value on Recurring Basis
Fair Value, Measurements, Recurring [Member]
Fair Value Hierarchy and NAV
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV
Fair Value Hierarchy and NAV [Domain]
Quoted Prices in Active Markets for Identical Assets
Fair Value, Inputs, Level 1 [Member]
Significant Other Observable Inputs
Fair Value, Inputs, Level 2 [Member]
Significant Unobservable Inputs
Fair Value, Inputs, Level 3 [Member]
Investment Type
Investment Type [Axis]
Investments
Investments [Domain]
Cash and cash equivalents
Cash and Cash Equivalents [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]
Total assets
Assets, Fair Value Disclosure
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Sale of Stock
Sale of Stock [Axis]
Sale of Stock
Sale of Stock [Domain]
2018 Employee Stock Purchase Plan
Employee Stock [Member]
Plan Name
Plan Name [Axis]
Plan Name
Plan Name [Domain]
2018 Plan and 2006 Plan
Two Thousand Eighteen And Two Thousand Six Equity Incentive Plan [Member]
Two thousand eighteen and two thousand six equity incentive plan.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Exercised (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Canceled (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Ending balance (shares)
Vested and exercisable (shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number
Weighted- Average Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance (USD per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Granted (USD per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Exercised (USD per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Canceled (USD per share)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Ending balance (USD per share)
Vested and exercisable (USD per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price
Weighted- Average Remaining Contractual Term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Contractual Term [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Contractual Term [Roll Forward]
Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Vested and exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term
Aggregate Intrinsic Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Beginning balance
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Ending balance
Vested and exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value
Accounting Policies [Abstract]
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
Antidilutive Securities [Axis]
Antidilutive Securities, Name
Antidilutive Securities, Name [Domain]
Series B Convertible Preferred Stock
Series B Convertible Preferred Stock [Member]
Series B convertible preferred stock.
Series B-1 Convertible Preferred Stock
Series B One Convertible Preferred Stock [Member]
Series B-one convertible preferred stock.
Convertible Preferred Stock Warrants
Convertible Preferred Stock Warrants [Member]
Convertible preferred stock warrants.
Series A convertible preferred stock
Common Stock Option [Member]
Common stock option member.
Common warrants
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Summary of Stock Option Activity Under 2018 Plan and 2006 Plan
Share-based Compensation, Stock Options, Activity [Table Text Block]
Summary of Recognized Stock-Based Compensation Expense
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Schedule of Weighted-Average Assumptions in Black -Scholes Option Pricing Model
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Common Stock Reserved for Future Issuance
Schedule Of Common Stock Reserved For Future Issuance Table [Text Block]
Schedule of common stock reserved for future issuance.
Income Statement [Abstract]
Statement [Table]
Statement [Table]
Product and Service
Product and Service [Axis]
Product and Service
Product and Service [Domain]
Product revenue
Product [Member]
Other revenue
Product and Service, Other [Member]
Statement [Line Items]
Statement [Line Items]
Revenue:
Revenues [Abstract]
Total revenue
Revenue from Contract with Customer, Excluding Assessed Tax
Cost of revenue:
Cost of Revenue [Abstract]
Total cost of revenue
Cost of Goods and Services Sold
Operating expense:
Costs and Expenses [Abstract]
Research and development
Research and Development Expense
Selling, general and administrative
Selling, General and Administrative Expense
Total operating expense
Costs and Expenses
Loss from operations
Operating Income (Loss)
Other income (expense):
Nonoperating Income (Expense) [Abstract]
Interest expense
Interest Expense
Change in fair value of preferred stock warrants and expirations
Loss on debt extinguishment
Other expense
Other Nonoperating Expense
Total other income (expense)
Nonoperating Income (Expense)
Provision for income taxes
Income Tax Expense (Benefit)
Net loss
Net Income (Loss) Attributable to Parent
Net loss per share, basic and diluted (USD per share)
Earnings Per Share, Basic and Diluted
Weighted-average common shares outstanding basic and diluted (shares)
Weighted Average Number of Shares Outstanding, Basic and Diluted
Prepaid Expenses and Other Current Assets
Prepaid Expenses And Other Current Assets [Text Block]
The entire disclosure of prepaid expenses and other current assets.
Summary of Significant Accounting Policies
Significant Accounting Policies [Text Block]
Unrecognized compensation cost related to outstanding employee options
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized
Unrecognized compensation cost related to outstanding employee options, period for recognition
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Accrued Liabilities, Current [Abstract]
Schedule of Accrued Expenses
Schedule of Accrued Liabilities [Table Text Block]
Schedule of Debt and Unamortized Discount Balances
Schedule of Debt [Table Text Block]
Schedule of Future Minimum Payments Including Interest
Schedule of Maturities of Long-term Debt [Table Text Block]
Materials and supplies
Inventory, Raw Materials and Supplies, Net of Reserves
Finished goods
Inventory, Finished Goods, Net of Reserves
Total
Inventory, Net
Schedule of Future Minimum Lease Payments Required under Non-Cancelable Leases
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Long-Term Debt
Long-term Debt [Text Block]
Square One Loan And Security Agreement
Square One Loan And Security Agreement [Member]
Square 1 Loan and Security Agreement.
Series D and D-1 Convertible Preferred Stock
Series D and D-1 Convertible Preferred Stock [Member]
Series D and D-1 Convertible Preferred Stock [Member]
Proceeds from loan
Proceeds from Loans
Debt discount charge
Required secure funding
Required Secured Funds
Required secured funds.
Total cash collected from customers
Proceeds from Customers
Schedule of Stock by Class [Table]
Schedule of Stock by Class [Table]
Stock options issued and outstanding
Stock Options Issued And Outstanding [Member]
Stock options issued and outstanding.
Authorized for future stock awards, option grants, or employee stock purchase program
Authorized For Future Stock Awards Option Grants Or Employee Stock Purchase Program [Member]
Authorized for future stock awards, option grants, or employee stock purchase program.
Common Warrants
Common Warrants [Member]
Common warrants.
Class of Stock [Line Items]
Class of Stock [Line Items]
Common stock initially reserved for future issuance (shares)
Common Stock, Capital Shares Reserved for Future Issuance
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
Prepaid expenses and other current assets
Total current assets
Assets, Current
Property and equipment, net
Total assets
Assets
Liabilities and stockholders’ equity (deficit)
Liabilities and Equity [Abstract]
Current liabilities:
Liabilities, Current [Abstract]
Accounts payable
Accounts Payable, Current
Accrued expenses
Accrued Liabilities, Current
Deferred revenue
Contract with Customer, Liability, Current
Total current liabilities
Liabilities, Current
Long-term debt
Long-term deferred revenue
Contract with Customer, Liability, Noncurrent
Other non-current liabilities
Other Liabilities, Noncurrent
Total liabilities
Liabilities
Commitments and contingencies (Note 9)
Commitments and Contingencies
Stockholders’ equity (deficit):
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, $0.0001 par value, 200,000,000 and 200,000,000 shares authorized at June 30, 2019 and December 31, 2018, respectively; 10,897,522 and 10,055,072 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital, Common Stock
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Total stockholders’ equity (deficit)
Stockholders' Equity Attributable to Parent
Total liabilities and stockholders’ equity (deficit)
Liabilities and Equity
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Federal, state, and foreign income tax expense/(benefit)
Depreciation and amortization expense
Document And Entity Information [Abstract]
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
Entity Current Reporting Status
Entity Current Reporting Status
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 Shell Company
Entity Shell Company
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Accrued Expenses
Accounts Payable and Accrued Liabilities Disclosure [Text Block]
Accrued compensation expenses
Employee-related Liabilities, Current
Accrued professional services
Accrued Professional Fees, Current
Accrued royalties
Accrued Royalties, Current
Accrued other
Other Accrued Liabilities, Current
Total
Gross Payments
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019 (6 months remaining)
Operating Leases, Future Minimum Payments, Remainder of Fiscal Year
2020
Operating Leases, Future Minimum Payments, Due in Two Years
Total minimum lease payments
Operating Leases, Future Minimum Payments Due
Scheduled Sublease Payments
Operating Leases, Future Minimum Payments Receivable [Abstract]
2019 (9 months remaining)
Operating Leases, Future Minimum Payments Receivable, Current
2020
Operating Leases, Future Minimum Payments Receivable, in Two Years
Total minimum lease payments
Operating Leases, Future Minimum Payments Receivable
Net Payments
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity Net [Abstract]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity Net [Abstract]
2019 (9 months remaining)
Operating Leases, Future Minimum Payments Due, Next Twelve Months, Net
Operating Leases, Future Minimum Payments Due, Next Twelve Months, Net
2020
Operating Leases, Future Minimum Payments, Due in Two Years, Net
Operating Leases, Future Minimum Payments, Due in Two Years, Net
Total minimum lease payments
Operating Leases, Future Minimum Payments Due Net
Operating Leases, Future Minimum Payments Due Net
Equity Components
Equity Components [Axis]
Equity Component
Equity Component [Domain]
Purchase Agreement
Common Stock Purchase Agreement [Member]
Common Stock Purchase Agreement [Member]
Preferred stock, shares authorized (shares)
Preferred Stock, Shares Authorized
Preferred stock, par value (USD per share)
Preferred Stock, Par or Stated Value Per Share
Share issued exercise options (shares)
Value of shares to be sold to Aspire
Stock Purchase Agreement, Commitment Of Counterparty To Purchase Stock, Value
Stock Purchase Agreement, Commitment Of Counterparty To Purchase Stock, Value
Value of additional shares to be sold to Aspire
Stock Purchase Agreement, Additional Commitment Of Counterparty To Purchase Stock, Value
Stock Purchase Agreement, Additional Commitment Of Counterparty To Purchase Stock, Value
Commitment period
Sale of Stock, Commitment Period
Sale of Stock, Commitment Period
Shares issued as issuance costs (in shares)
Stock Issued During Period, Shares, Issued for Services
Statement of Stockholders' Equity [Abstract]
Additional Paid-in Capital
Additional Paid-in Capital [Member]
Accumulated Deficit
Retained Earnings [Member]
Convertible Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Convertible Preferred Stock, Beginning Balance (shares)
Convertible Preferred Stock, Beginning Balance
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests
Convertible Preferred Stock, Ending Balance (shares)
Convertible Preferred Stock, Ending Balance
Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (shares)
Shares, Outstanding
Beginning Balance
Stock option exercises (shares)
Stock option exercises
Stock Issued During Period, Value, Stock Options Exercised
Issue common stock (shares)
Stock Issued During Period, Shares, New Issues
Issue common stock
Stock Issued During Period, Value, New Issues
Stock-based compensation expense
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition
Issue warrants for debt
Adjustments to Additional Paid in Capital, Warrant Issued
Issue stock for debt
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature
ESPP Purchases (shares)
Stock Issued During Period, Shares, Employee Stock Purchase Plans
ESPP Purchases
Stock Issued During Period, Value, Employee Stock Purchase Plan
Net loss
Ending Balance (shares)
Ending Balance
Initial Public Offering
IPO [Member]
Warrants exercisable for convertible preferred stock
Warrants Exercisable For Convertible Preferred Stock
Warrants exercisable for convertible preferred stock.
Warrants previously exercisable for preferred stock
Warrants Previously Exercisable For Preferred Stock
Warrants previously exercisable for preferred stock.
Warrants expired on the effective date
Number Of Warrants Expired
Number of warrants expired.
Remaining warrants previously exercisable for preferred stock adjusted to become exercisable for common stock
Warrants Previously Exercisable For Preferred Stock Adjusted To Become Exercisable For Common Stock
Warrants previously exercisable for preferred stock adjusted to become exercisable for common stock.
Schedule of Fair Value Measurement of Assets And Liabilities
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Organization And Basis Of Presentation [Table]
Organization And Basis Of Presentation [Table]
Organization and basis of presentation.
Underwriters Over-Allotment Option
Over-Allotment Option [Member]
Range
Range [Axis]
Range
Range [Domain]
Maximum
Maximum [Member]
Organization And Basis Of Presentation [Line Items]
Organization And Basis Of Presentation [Line Items]
Organization and basis of presentation.
Number of units sold (shares)
Number of securities called by each IPO unit
Number Of Securities Called By Each IPO Unit
Number Of Securities Called By Each IPO Unit
Number of securities called by each warrant or right
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right
Offering price per unit
Shares Issued, Price Per Share
Net cash proceeds after deducting underwriting discounts and commissions
Proceeds From Issuance After Deducting Underwriters Discounts And Commissions
Proceeds from issuance after deducting underwriters discounts and commissions.
Underwriters' discounts and commissions
Payments for Underwriting Expense
Offering expenses
Payments of Stock Issuance Costs
Conversion of preferred stock warrants into common stock warrants
Adjustments To Additional Paid In Capital Reclassification Of Convertible Preferred Stock Warrant Liability
Adjustments to additional paid in capital reclassification of convertible preferred stock warrant liability.
Issuance of warrants to underwriters to purchase of common stock
Issuance Of Warrants To Underwriters To Purchase Of Common Stock
Issuance of warrants to underwriters to purchase of common stock.
Fair value of warrants
Outstanding convertible promissory notes and accrued interest converted, amount
Debt Conversion, Converted Instrument, Amount
Outstanding convertible promissory notes and accrued interest converted, shares
Stock Issued During Period, Shares, Conversion of Convertible Securities
Percentage of offering price per unit
Percentage Of Offering Price Per Unit Under Public Offering
Percentage of offering price per unit under public offering.
Conversion ratio
Stockholders' Equity Note, Stock Split, Conversion Ratio
Net cash used in operating activities
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]
Subsidiary, Sale of Stock [Line Items]
Subsidiary, Sale of Stock [Line Items]
Incremental rate at which the shares reserved for issuance increase
Annual Increase In Aggregate Number Of Shares Reserved For Future Issuance As Percentage Shares Outstanding
Annual increase in aggregate number of shares reserved for future issuance as percentage shares outstanding.
Number of common stock purchased under plan (shares)
2018 Equity Incentive Plan
Two Thousand Eighteen Equity Incentive Plan [Member]
Two thousand eighteen equity incentive plan.
Award Type
Award Type [Axis]
Equity Award
Equity Award [Domain]
Employee Options
Employee Stock Option [Member]
Number of new shares issued under plan (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period
Shares of common stock subject to outstanding options (in shares)
Shares, granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures
Exercise price (USD per share)
Weighted-average grant date fair value (USD per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Schedule of Components of Inventories
Schedule of Utility Inventory [Table Text Block]
Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Net Loss Per Share Attributable to Common Stockholders
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Summary Of Significant Accounting Policies [Table]
Summary Of Significant Accounting Policies [Table]
Summary of significant accounting policies.
Concentration Risk Benchmark
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark
Concentration Risk Benchmark [Domain]
Accounts Receivable
Accounts Receivable [Member]
Customer
Customer [Axis]
Customer
Customer [Domain]
Ultravision Technology Ltd.
Ultravision Technology Limited [Member]
Ultravision Technology Limited.
BioStar Company
Bio Star Company [Member]
BioStar Company.
Summary Of Significant Accounting Policies [Line Items]
Summary Of Significant Accounting Policies [Line Items]
Summary of significant accounting policies.
Concentration risk percentage
Concentration Risk, Percentage
Number of operating segments
Number of Operating Segments
2019
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
2020
Long-term Debt, Maturities, Repayments of Principal in Year Two
2021
Long-term Debt, Maturities, Repayments of Principal in Year Three
2022
Long-term Debt, Maturities, Repayments of Principal in Year Four
2023-2024
Long Term Debt Maturities Repayments Of Principal In Year Five And Six
Long term debt maturities repayments of principal in year five and six.
Total minimum loan payments
Long Term Debt Minimum Loan Payments Including Interest
Long term debt minimum loan payments including interest.
Unamortized interest
Unamortized Debt Issuance Expense
Accretion of debt discount
Stock discount issued
Warrant fair value
Fair Value Of Warrant Net Of Accretion
Warrant fair value, net of accretion.
Capitalized debt issuance costs and end of term charge
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Note Purchase Agreement
Note Purchase Agreement [Member]
Note purchase agreement.
Short-term Debt, Type
Short-term Debt, Type [Axis]
Short-term Debt, Type
Short-term Debt, Type [Domain]
Convertible Notes
Convertible Notes Payable [Member]
Original principal amount
Convertible Promissory Note Original Amount
Convertible promissory note original amount.
Increase the principal amount available for issuance
Convertible Debt
Convertible notes outstanding
Convertible Notes Payable
Minimum
Minimum [Member]
Risk-free interest rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Expected volatility
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Expected term (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Expected dividend yield
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Schedule of Property and Equipment, net
Property, Plant and Equipment [Table Text Block]
Convertible Preferred Stock and Stockholders’ Equity (Deficit)
Stockholders' Equity Note Disclosure [Text Block]
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Accounts Receivable
Receivables, Policy [Policy Text Block]
Inventory
Inventory, Policy [Policy Text Block]
Revenue Recognition
Revenue from Contract with Customer [Policy Text Block]
Segment Reporting
Segment Reporting, Policy [Policy Text Block]
Net Loss Per Share
Earnings Per Share, Policy [Policy Text Block]
Recent Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Income Statement Location
Income Statement Location [Axis]
Income Statement Location
Income Statement Location [Domain]
Research and development
Research and Development Expense [Member]
General and administrative
General and Administrative Expense [Member]
Total stock-based compensation expense
Allocated Share-based Compensation Expense