Redeemable convertible preferred stock issuance cost Payments for Repurchase of Redeemable Convertible Preferred Stock Proceeds from the issuance of redeemable convertible preferred stock Proceeds from issuance of common stock upon initial public offering, net of underwriting discounts and commissions Conversion of redeemable convertible preferred stock warrants to common stock warrants upon initial public offering, shares Conversion of redeemable convertible preferred stock warrants to common stock warrants upon initial public offering Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs of $23.8 million, shares Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering costs of $23.8 million Conversion of redeemable convertible preferred stock to common stock upon initial public offering Net loss and comprehensive loss Exercise of stock options, shares Exercise of stock options Weighted-average shares outstanding, basic and diluted Other expense, net Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) Total stockholders' equity (deficit) Stockholders' equity (deficit): Liabilities, redeemable convertible preferred stock, and stockholders' equity (deficit) Operating lease right-of-use assets Total base rent under lease agreement Total base rent under lease agreement Total base rent under lease agreement. Deferred costs, current Common Stock issued on conversion of convertible preferred stock Common Stock Issued On Conversion Of Convertible Preferred Stock Common Stock issued on conversion of convertible preferred stock. Proceeds from exercise of common stock options Payment of other offering costs related to the initial public offering Payments Of Stock Issuance Costs Related To Initial Public Offering Payments of stock issuance costs related to initial public offering. Restricted Stock Units Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Subsidiary, Sale of Stock [Line Items] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Series F Series E Series F Preferred Stock [Member] Series E Preferred Stock [Member] Issuance costs Debt issuance costs - third party Payments of Debt Issuance Costs Amortization of right-of-use asset Operating Lease, Right-of-Use Asset, Amortization Expense Issuance of options and restricted stock units under stock plan Issuance of common stock under employee stock purchase plan Issuance of options and restricted stock units under stock plan [Member] Issuance of options and restricted stock units under stock plan [Member] Conversion of preferred stock warrants to common stock warrants upon the closing of the IPO Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants Total deferred costs Deferred Costs, Current Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Shares Available for Grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Sharebased Compensation Arrangement By Sharebased Payment Award Award Vesting Rights Percentage Stock Option Granted For period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Options Granted Merit Awards [Member] Options Granted To New Hires [Member] Options granted to new hires. Incentive Stock Option [Member] Incentive stock option. Restricted Stock Units R S U [Member] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Award Type Award Type [Axis] I S O [Member] ISO Two Thousand And Eleven Plan [Member] Plan Name Plan Name [Domain] Plan Name Plan Name [Axis] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] 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) Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Unrecognized stock-based compensation of unvested options Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Aggregate intrinsic value of options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Weighted-average grant-date fair values of options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Average Intrinsic Value Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract] Expected to vest as of June 30, 2021 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Vested and exercisable as of June 30, 2021 Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Balances as of June 30, 2021 Weighted-Average Exercise Price Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price [Roll Forward] Vested and exercisable as of June 30, 2021 Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward] Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 Debt Instrument Interest Rate Effective Percentage Debt Instrument Basis Spread On Variable Rate1 Debt Instrument [Line Items] Debt Instrument [Line Items] Revolving Credit Facility Two Thousand Twenty [Member] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Exercise price percentage of an ISO granted Share Based Compensation Arrangement By Share Based Payment Exercise Price Percentage Granted Issuance of options under plan Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Dividends declared Dividends Common Stock Number of votes entitled per share of common stock Common Stock Vote Per Share Weighted Average Remaining Contractual Term Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Alternative investment, measurement input Alternative Investment Measurement Input Alternative Investment Measurement Input Period Period of input used to measure alternative investment. Warrants Fair Value Warrants fair value. Series F Redeemable Convertible Preferred Stock [Member] Measurement Input Expected Dividend Rate [Member] Measurement Input Price Volatility [Member] Measurement Input Risk Free Interest Rate [Member] Measurement Input Expected Term [Member] Measurement Input Type Measurement Input Type [Domain] Measurement Input Type Measurement Input Type [Axis] Series C Redeemable Convertible Preferred Stock [Member] Series A redeemable convertible preferred stock. Stock issued upon conversion of redeemable convertible preferred shares (in shares) Maximum [Member] Minimum [Member] Statistical Measurement Range [Member] Statistical Measurement Range [Axis] Class Of Stock [Line Items] Class Of Stock [Line Items] Schedule Of Stock By Class [Table] Schedule Of Stock By Class [Table] Issuance Costs Temporary Equity Issuance Cost Temporary equity issuance cost. Original Issuance Price Temporary Equity Original Issuance Price Per Share Temporary equity original issuance price per share. Present value of future minimum lease payments Line Of Credit Facility Commitment Fee Description Additional Paid In Capital [Member] Common Stock Common Stock [Member] Equity Component Equity Component [Domain] Equity Components Statement Equity Components [Axis] Redeemable Convertible Preferred Stock Redeemable Convertible Preferred Stock [Member] Class of Stock Class Of Stock [Domain] Class of Stock Statement Class Of Stock [Axis] Statement [Table] Statement [Table] Statement Of Stockholders Equity [Abstract] Weighted Average Number Of Share Outstanding Basic And Diluted Net loss per share attributable to common stockholders, basic and diluted Earnings Per Share Basic And Diluted Net loss and comprehensive loss Deferred Costs, Total Series F redeemable convertible preferred stock issuance cost Redeemable Convertible Preferred Stock Issuance Cost Value redeemable convertible preferred stock issuance cost value. Common stock par value of $0.001 per share; 200,000,000 and 21,831,000 shares authorized as of September 30, 2021 and December 31, 2020, respectively; 47,292,022 and 9,509,182 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively Convertible preferred stock, $0.001 par value; 10,000,000 shares authorized as of September 30, 2021, no shares issued and outstanding as of September 30, 2021; 14,241,390 shares authorized as of December 31, 2020, 12,767,202 shares issued and outstanding as of December 31, 2020; aggregate liquidation preference of $118.6 million as of December 31, 2020 Lease, borrowing rate Operating Lease, Weighted Average Discount Rate, Percent Lease commencement date Lease Commencement Date Lease Commencement Date 2011 Plan and 2021 Plan Two Thousand Eleven Plan And Two Thousand Twenty One Plan [Member] Two Thousand Eleven Plan And Two Thousand Twenty One Plan Conversion of redeemable convertible preferred stock Conversion of preferred stock warrants to common stock warrants upon the closing of the IPO Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments, Total Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments Common stock issuance cost Exercise of common stock warrants Exercise of common stock warrants, shares Exercise of Common Stock Warrants, Shares Exercise of common stock warrants shares. Exercise of Common Stock Warrants Exercise of common stock warrants. Conversion and Reclassification of Preferred Stock Warrants to Common Stock Warrants Upon Initial Public Offering Conversion and reclassification of preferred stock warrants to common stock warrants upon initial public offering. Conversion and Reclassification of Preferred Stock Warrants to Common Stock Warrants Upon Initial Public Offering, Shares Conversion and Reclassification of Preferred Stock Warrants to Common Stock Warrants Upon Initial Public Offering, Shares Stock Issued During Period, Shares, New Issues Stock Issued During Period, Value, New Issues Series F redeemable convertible preferred stock issuance cost Share of common stock purchased 2021 Employee Stock Purchase Plan Two Thousand Twenty One Employee Stock Purchase Plan [ Member] Two thousand twenty one employee stock purchase plan. Stock based compensation Employee Benefits and Share-based Compensation Reclassification of the related redeemable convertible preferred stock Reclassifications of Temporary to Permanent Equity Redeemable convertible preferred stock outstanding Convertible Preferred Stock, Nonredeemable or Redeemable, Issuer Option, Value Weighted-Average Exercise Price, Vested and exercisable as of September 30, 2021 Weighted-Average Exercise Price, Expected to vest as of September 30, 2021 Average Intrinsic Value, Vested and expected as of September 30, 2021 Average Intrinsic Value, Vested and exercisable as of September 30, 2021 Weighted-Average Exercise Price, Exercised/released Weighted-Average Exercise Price, Forfeited/cancelled Weighted-Average Exercise Price, Granted Number of Shares, Vested and expected to vest as of Septmeber 30, 2021 Number of Shares Vested and exercisable as of September 30, 2021 Number of Shares Number of Shares, Exercised/released Number of Shares, Forfeited/cancelled Number of Shares, Granted Number of Shares Shares Available for Grant, Forfeited/cancelled Shares Available for Grant, Granted 2021 Plan Two Thousand And Twenty One Plan [Member] Two thousand and twenty one plan. Equity Incentive Plans Share of common stock issued upon warrant exercised Conversion of Stock, Shares Issued Acquisition of property and equipment included in accounts payable and accrued liabilities Noncash or Part Noncash Acquisition, Fixed Assets Acquired Common stock warrants issued on conversion of preferred stock warrants and the reclassification of the warrant liability Common Stock Warrants Issued on Conversion of Preferred Stock Warrants and the Reclassification of the Warrant Liability Common stock warrants issued on conversion of preferred stock warrants and the reclassification of the warrant liability. Common Stock issued on conversion of convertible preferred stock Stock Issued During Period, Value, Conversion of Convertible Securities Deferred initial public offering cost recorded to additional paid in capital Noncash investing and financing: Other Noncash Investing and Financing Items [Abstract] Provision for income taxes Income Tax Expense Benefit Loss before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Loss from operations Operating Income Loss Operating expense Total operating expenses Operating Expenses Selling, general and administrative Selling General And Administrative Expense Operating expenses: Operating Expenses [Abstract] Gross profit Surgical Glaucoma Gross Profit Total Cost of goods sold Cost Of Goods And Services Sold Revenue Revenue From Contract With Customer Excluding Assessed Tax Income Statement [Abstract] Common stock, shares outstanding Common Stock Shares Outstanding Common stock, shares issued Common Stock Shares Issued Common stock, shares authorized Common Stock Shares Authorized Common stock, par value Long-term Debt, Total Common Stock, Shares, Issued, Total Financial Liabilities Fair Value Disclosure, Total Increase (Decrease) in Inventories, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accounts Payable, Current, Total Dividends, Common Stock, Total Debt Instrument, Fair Value Disclosure, Total Income Tax Expense (Benefit), Total Other Assets, Noncurrent, Total Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Share-based Payment Arrangement, Noncash Expense, Total Debt Instrument, Unamortized Discount, Total Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Revenue from Contract with Customer, Excluding Assessed Tax, Total Accounts Receivable, after Allowance for Credit Loss, Current, Total Selling, General and Administrative Expense, Total Line Of Credit Facility Collateral Fees Percentage Line of credit facility collateral fees. Debt Instrument, Covenant Description Debt Instrument Covenant Description Debt Instrument Covenant Maximum Revenue Debt instrument covenant maximum revenue. Debt Instrument Covenant Minimum Revenue Debt instrument covenant minimum revenue. Common stock reserved for future issuance Common Stock Capital Shares Reserved For Future Issuance Dividend yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Tranche Three Loans Tranche Three Loans [Member] Tranche Two Loans Tranche Two Loans [Member] Tranche One Loans Tranche One Loans [Member] Tranche One And Two Loans [Member] London Interbank Offered Rate L I B O R [Member] Variable Rate Variable Rate [Domain] Variable Rate Variable Rate [Axis] Revolving Credit Facility Two Thousand Nineteen [Member] Credit Facility Credit Facility [Domain] Credit Facility Credit Facility [Axis] Mid Cap Financial Services [Member] Debt Instrument [Table] Debt Instrument [Table] Noncurrent portion of lease liabilities Operating Lease Liability Noncurrent Other noncurrent liabilities Other Non Current Liabilities Other non current liabilities. Long term interest payable Interest Payable Non Current Interest payable non current. Redeemable preferred stock warrants liabilities Redeemable Preferred Stock Warrants Liabilities Non Current Redeemable preferred stock warrants liabilities non current. Other accrued liabilities Other Accrued Liabilities Current Short term interest payable Interest Payable Current Less: current portion of operating lease liability Current portion of lease liabilities Operating Lease Liability Current Less: Accumulated depreciation Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Property Plant And Equipment Gross Property Plant And Equipment [Line Items] Property Plant And Equipment [Line Items] Construction In Process Construction In Progress [Member] Leasehold Improvements Leasehold Improvements [Member] Furniture and Fixtures Furniture And Fixtures [Member] Computer Equipment and Software Computer Equipment [Member] Tools and Equipment Tools Dies And Molds [Member] Long-Lived Tangible Asset Property Plant And Equipment Type [Domain] Long-Lived Tangible Asset Property Plant And Equipment By Type [Axis] Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Change in fair value Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Period Increase Decrease Fair Value Measurement With Unobservable Inputs Reconciliations Recurring Basis Liability Value Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Common Stock Stockholders Equity Note Disclosure [Text Block] Equity [Abstract] Redeemable Convertible Preferred Stock Warrants Warrant Disclosure [Text Block] The entire disclosure for warrants. Warrants And Rights Note Disclosure [Abstract] Common Stock Warrants Common Stock Warrants [Text Block] Redeemable Convertible Preferred Stock [Abstract] Redeemable convertible preferred stock. Redeemable Convertible Preferred Stock Redeemable Convertible Preferred Stock [Text Block] Loss on disposal of property and equipment Gain Loss On Sale Of Property Plant Equipment Provision for excess and obsolete inventories Inventory Write Down Provision for doubtful accounts receivable Provision For Doubtful Accounts Stock-based compensation expense Share Based Compensation Accretion of debt discount and amortization of debt issuance costs Amortization Of Financing Costs And Discounts Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Depreciation Debt Instrument Fair Value Total liabilities measured at fair value Financial Liabilities Fair Value Disclosure Liabilities: Financial Liabilities Fair Value Disclosure [Abstract] 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] Level 2 Level 1 Fair Value, Recurring Fair Value Measurements Recurring [Member] Measurement Frequency Fair Value Measurement Frequency [Domain] Measurement Frequency Fair Value By Measurement Frequency [Axis] Long-term Debt Long Term Debt Debt Instrument, Name Debt Instrument Name [Domain] Debt Instrument Debt Instrument [Axis] Present value of future minimum lease payments Operating Lease Liability Less: imputed interest Lessee Operating Lease Liability Undiscounted Excess Amount Total future minimum lease payments Lessee Operating Lease Liability Payments Due 2024 Lessee Operating Lease Liability Payments Due Year Three 2023 Lessee Operating Lease Liability Payments Due Year Two 2022 Lessee Operating Lease Liability Payments Due Next Twelve Months 2021 Lessee Operating Lease Liability Payments Remainder Of Fiscal Year New operating lease assets obtained in exchange for operating lease liabilities Right Of Use Asset Obtained In Exchange For Operating Lease Liability Cash paid for operating leases Operating Lease Payments 2023 Long Term Debt Maturities Repayments Of Principal In Year Two 2022 Long Term Debt Maturities Repayments Of Principal In Next Twelve Months 2021 (remainder) Long Term Debt Maturities Repayments Of Principal Remainder Of Fiscal Year Less: Current portion Long Term Debt Current Total amounts outstanding Debt Longterm And Shortterm Combined Amount Less: debt discount related to warrant liability and issuance costs Debt Instrument Unamortized Discount Line Of Credit Facility Current Borrowing Capacity Accrued Accretion On Maturity Payments Accrued accretion on maturity payments. Fair Value Of Warrants Fair value of warrants. Proceeds From Issuance Of Common Stock Line Of Credit Facility Commitment Fee Amount Line Of Credit Facility Unused Capacity Commitment Fee Percentage Stockholders Equity Note Stock Split Estimated offering costs Payments Of Stock Issuance Costs Sale of stock, price per share Fair Value Measurement Inputs Disclosure [Text Block] Fair Value Disclosures [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Accounting Policies [Abstract] Company and Nature of Business Nature Of Operations Organization Consolidation And Presentation Of Financial Statements [Abstract] Supplemental noncash disclosure Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Cash paid for interest Interest Paid Net Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Net change in cash and cash equivalents Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Net Cash Provided By Used In Financing Activities Proceeds From Stock Options Exercised Proceeds From Issuance Of Convertible Preferred Stock Cash flows from financing activities Net Cash Provided By Used In Financing Activities [Abstract] Net cash used in investing activities Net Cash Provided By Used In Investing Activities Purchases of property and equipment Payments To Acquire Property Plant And Equipment Cash flows from investing activities Net Cash Provided By Used In Investing Activities [Abstract] Net cash used in operating activities Net Cash Provided By Used In Operating Activities Other noncurrent liabilities Increase Decrease In Other Noncurrent Liabilities Accrued and other current liabilities Increase Decrease In Accrued Liabilities Accrued compensation Increase Decrease In Employee Related Liabilities Accounts payable Increase Decrease In Accounts Payable Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Inventory Increase Decrease In Inventories Accounts receivable Increase Decrease In Accounts Receivable Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Current liabilities: Liabilities Current [Abstract] Liabilities And Stockholders Equity [Abstract] Total assets Schedule Of Future Minimum Rental Payments For Operating Leases Table [Text Block] Schedule of Operating Lease Expense Recognized and Supplemental Cash Flow Lease Cost Table [Text Block] Repayment Schedule Relating to the Company's Debt Schedule Of Extinguishment Of Debt [Text Block] Schedule of Long-term and Short-term Debt Schedule Of Debt Table [Text Block] Summary of Other Noncurrent Liabilities Other Noncurrent Liabilities Table [Text Block] Summary of Accrued and Other Current Liabilities Accrued And Other Current Liabilities Table [Text Block] Summary of Property and Equipment, Net Property Plant And Equipment [Text Block] Summary of Changes in Level 3 Fair Value Instruments Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block] Fair Value Liabilities Measured On Recurring Basis [Text Block] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] New Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements Policy Policy [Text Block] Accounting for Payroll Protection Program Accounting For Payroll Protection Program Policy [Text Block] Deferred Offering Costs Deferred Offering Costs Policy [Text Block] Deferred offering costs. Fair Value of Financial Instruments Fair Value Of Financial Instruments Policy Use of Estimates Use Of Estimates Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Subsequent Events [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Segment Reporting [Abstract] Defined Contribution Plan Defined Contribution Plan [Text Block] Postemployment Benefits [Abstract] Net Loss per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Earnings Per Share [Abstract] Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Depreciation Adjustments to reconcile net loss to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss Cash flows from operating activities Net Cash Provided By Used In Operating Activities [Abstract] Statement Of Cash Flows [Abstract] Proceeds from Paycheck Protection Program loan Proceeds From Paycheck Protection Program Loan Proceeds from Paycheck Protection Program loan Stock issuance costs Temporary Equity Stock Issued During Period Value New Issues Series E Convertible Preferred Stock Series E Convertible Preferred Stock [Member] Series E convertible preferred stock. Stock-based compensation expense Stock Issued During Period Value Share Based Compensation Exercise of options under stock plan Stock Issued During Period Shares Stock Options Exercised Stock Issued During Period Value Stock Options Exercised Shares Outstanding Statement [Line Items] Statement [Line Items] Retained Earnings [Member] Preferred stock par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Operating Lease Expense Operating lease term Lessee Operating Lease Term Of Contract Operating lease, discount rate Lessee Operating Lease Discount Rate Lease expiration date Lease Expiration Date1 Operating lease office space Area Of Land 2025 Long Term Debt Maturities Repayments Of Principal In Year Four 2024 Long Term Debt Maturities Repayments Of Principal In Year Three Cost of goods sold Cost Of Goods And Services Sold [Abstract] Revenue Revenues [Abstract] Dry Eye [Member] Surgical Glaucoma [Member] Segments Segment [Domain] Segments Statement Business Segments [Axis] Number of Reportable Segments Number Of Reportable Segments Defined contribution plan, maximum annual contributions per employee Defined Contribution Plan Maximum Annual Contributions Per Employee Percent Anti-dilutive securities excluded from computation of earnings per share Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Options to Purchase Common Stock Employee Stock Option [Member] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Denominator: Earnings Per Share Basic And Diluted Other Disclosures [Abstract] Numerator: Earnings Per Share Reconciliation [Abstract] Total stock-based compensation expense Allocated Share Based Compensation Expense Selling General And Administrative Expenses [Member] Research And Development Expense [Member] Cost Of Sales [Member] Income Statement Location Income Statement Location [Domain] Income Statement Location Income Statement Location [Axis] Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Depreciation, Total Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total Increase (Decrease) in Prepaid Expense and Other Assets, Total Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Employee-related Liabilities, Current, Total Increase (Decrease) in Accrued Liabilities, Total Amortization of Debt Issuance Costs and Discounts, Total Earnings Per Share, Basic and Diluted, Total Payments to Acquire Property, Plant, and Equipment, Total Cash and Cash Equivalents, at Carrying Value, Total Accrued amount related accretion on maturity payments Line of credit facility, unused capacity, commitment fee percentage Line of credit facility collateral fees Line of credit facility commitment fee amount Proceeds from issuance of common stock Fair value of warrants Line of credit facility, current borrowing capacity Class of warrant exercise price Debt instrument, variable rate Net loss attributable to common stockholders Funding of Tranche 1 and Tranche 2 under Two Thousand Nineteen Term Loan [Member] Funding of Two Thousand Nineteen Term Loan Tranche 3 [Member] Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Weighted average contractual term, vested and exercisable Weighted average contractual term, vested and expected Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Weighted average contractual term, vested and expected Shares Available for Grant, Additional shares reserved Shares Available for Grant, Option granted Carrying Value Beginning Balance Ending Balance Temporary Equity Carrying Amount Attributable To Parent Redeemable convertible preferred stock: Temporary Equity [Abstract] Commitments and contingencies (Note 6) Commitments And Contingencies Total liabilities Liabilities Total other noncurrent liabilities Other noncurrent liabilities Other Liabilities Noncurrent Total current liabilities Liabilities Current Accrued Liabilities Current Accrued compensation Employee Related Liabilities Current Accounts payable Accounts Payable Current The entire disclosure for redeemable convertible preferred stock. Assets Other noncurrent assets Other Assets Noncurrent Operating Lease Right Of Use Asset Property and equipment, net Property and equipment, net Property Plant And Equipment Net Total current assets Assets Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Inventory, net Inventory Net Accounts receivable, net Accounts Receivable Net Current Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash And Cash Equivalents At Carrying Value Current assets: Assets Current [Abstract] Assets Assets [Abstract] Statement Of Financial Position [Abstract] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Shell Company Entity Shell Company Entity Small Business Entity Small Business Entity Filer Category Entity Filer Category Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Trading Symbol Trading Symbol Title of 12(b) Security Security12b Title Local Phone Number Local Phone Number City Area Code City Area Code Entity Address, Postal Zip Code Entity Address Postal Zip Code Entity Address, State or Province Entity Address State Or Province Entity Address, City or Town Entity Address City Or Town Entity Address, Address Line Two Entity Address Address Line2 Entity Address, Address Line One Entity Address Address Line1 Entity Tax Identification Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Incorporation State Country Code Entity Ex Transition Period Entity Ex Transition Period Entity Emerging Growth Company Entity Emerging Growth Company Entity Registrant Name Entity Registrant Name Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Type Document Type Cover [Abstract] Entity Central Index Key Entity Central Index Key Accrued Liabilities, Current, Total Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease), Total Cost of Goods and Services Sold, Total Additional Paid in Capital, Common Stock, Beginning Balance Additional Paid in Capital, Common Stock, Ending Balance Increase (Decrease) in Employee Related Liabilities, Total Shares Available for Grant, Options forfeited/cancelled Weighted-Average Exercise Price Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Senior Secured Two Thousand Nineteen Term Loan [Member] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Senior Secured Twenty Twenty Term Loan [Member] Debt Instrument, Term Debt instrument, term Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Debt Instrument, Payment Terms Debt instrument payment terms Debt Instrument, Frequency of Periodic Payment Debt instrument, frequency of periodic payment Debt instrument, effective interest rate Interest Expense, Debt Interest Expense, Debt, Total Interest expense, debt Warrant term Warrants issued to purchase shares of convertible preferred stock Debt Issuance Costs, Net Debt Issuance Costs, Net, Total Debt issuance costs Debt Instrument Percentage of Prepayment Premium Year One Debt instrument percentage of prepayment premium year two. Debt Instrument Percentage of Prepayment Premium Year Two Debt instrument percentage of prepayment premium year three. Debt Instrument Percentage of Prepayment Premium Year Three Percentage of prepayment premium year one Proceeds from Paycheck Protection Program loan Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Gross Profit [Abstract] Gross profit Investment Income, Interest Interest income Increase (Decrease) in Other Noncurrent Assets Other noncurrent assets Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Beginning Balance Ending Balance Property and equipment, gross 2021 (remainder) 2022 2023 2024 2025 Total repayments Total repayments Shares Issued Shares Outstanding Mid Cap Financial Services. Accrued and other current liabilities. Common stock warrants. Debt instrument percentage of prepayment premium year one. Dry eye. Exercise of options under stock plan. Funding of two thousand Nineteen term loan tranche 3. Funding of tranche 1 and tranche 2 under two thousand Nineteen term loan. Options granted merit awards. Revolving credit facility 2020. Revolving credit facility 2019. Redeemable convertible preferred stock warrants liabilities. Surgical Glaucoma. Share based compensation arrangement by share based payment exercise price percentage granted. Series C redeemable convertible preferred stock and warrants. Senior secured 2019 term loan. Senior secured 2020 term loan. Two thousand Twenty warrant. Two thousand Nineteen warrants. Two thousand and Eleven plan. Tranche two loans. Tranche three loans. Tranche one loans. Tranche one and two loans. Schedule of Fair Value of Warrants Calculated Using Black-Scholes Model Senior Secured 2020 Term Loan Tranche One and Two Loans London Interbank Offered Rate (LIBOR) Fair Value Inputs Level 1 [Member] Fair Value Inputs Level 2 [Member] Fair Value Inputs Level 3 [Member] Percentage of prepayment premium year two Percentage of prepayment premium year three Line of Credit Facility, Commitment Fee Percentage Percentage of final payment fee Debt instrument interest payment term. Debt Instrument Interest Payment Term Debt instrument principal and interest payment term. Debt Instrument Principal and Interest Payment Term Debt instrument interest payment term Debt instrument principal and interest payment term Debt instrument interest payment extended term. Debt Instrument Interest Payment Extended Term Debt instrument interest payment extended term Summary of Fair Value Measurement of Liabilities of Measured on Recurring Basis Debt discount amortized term. Debt Discount Amortized Term Debt discount amortized term Fair value of outstanding debt Debt instrument covenant minimum revenue Debt instrument covenant maximum revenue Line of credit facility, commitment fee description Summary of Stock-Based Compensation Expense by Function Research and Development Expense Research and Development Expense, Total Research and development Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Sale Of Stock Price Per Share Number of shares sold Sale Of Stock Number Of Shares Issued In Transaction Redeemable Convertible Preferred Stock Warrants Redeemable Convertible Preferred Stock Warrants [Member] Subsequent Event Subsequent Event [Member] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Type Subsequent Event Type [Axis] Over Allotment Option [Member] I P O [Member] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Sale of Stock Subsidiary Sale Of Stock [Axis] Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Organization consolidation and presentation of financial statements disclosure. Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] Organization consolidation and presentation of financial statements disclosure. Underwriting Discounts And Commission Underwriting discounts and commission. Schedule of Segment Reporting Information Schedule Of Segment Reporting Information By Segment [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Schedule of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Summary of Weighted Average Valuation Assumptions Used to Estimate Fair Value of Employee Stock Options Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Schedule Of Stock By Class [Text Block] Schedule Of Stockholders Equity Note Warrants Or Rights [Text Block] Class Of Warrant Or Right [Line Items] Class Of Warrant Or Right [Line Items] Two Thousand Twenty Warrants [Member] Two Thousand Nineteen Warrants [Member] Class of Warrant or Right Class Of Warrant Or Right [Domain] Class of Warrant or Right Class Of Warrant Or Right [Axis] Class Of Warrant Or Right [Table] Class Of Warrant Or Right [Table] Summary of Redeemable Convertible Preferred Stock Issued and Outstanding Summary Of Redeemable Convertible Preferred Stock Issued And Outstanding Table [Text Block] Schedule of Aggregate Future Minimum Lease Payments Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Debt Debt Disclosure [Text Block] Debt Disclosure [Abstract] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Fair Value Measurements Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Inventory, Net, Total Common Stock Par Or Stated Value Per Share Temporary Equity Liquidation Preference Convertible preferred stock, shares outstanding Temporary Equity Shares Outstanding Convertible preferred stock, shares issued Temporary Equity Shares Issued Temporary Equity Shares Authorized Convertible preferred stock, par value Temporary Equity Par Or Stated Value Per Share Liabilities And Stockholders Equity Beginning Balance Ending Balance Stockholders Equity Accumulated deficit Retained Earnings Accumulated Deficit Additional paid-in-capital Additional Paid In Capital Common Stock Common Stock Value Stockholders Equity [Abstract] Funding of 2019 Term Loan Tranche 3 2019 Warrants 2020 Warrants Measurement Input Expected Term Measurement Input Risk Free Interest Rate Measurement Input Price Volatility Measurement Input Expected Dividend Rate Funding of Tranche 1 and Tranche 2 under 2019 Term Loan Term Loan Additional warrants issued expired. Additional Warrants Issued Expired Additional warrants issued expired Warrants to purchase shares of stock Warrants fair value Warrants expiration term Minimum Maximum Warrants term (in years) Term (in years) Summary of Stock Option Activity 2011 Plan ISO Restricted Stock Units RSU Incentive Stock Option Options Granted to New Hires Options Granted Merit Awards Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Stock option grant period Vesting period Redeemable convertible preferred stock issued and outstanding. Percentage of voting power required to own Percentage of Voting Power Required to Own Percentage of voting power required to own Vesting [Axis] Vesting [Domain] Share-based Payment Arrangement, Tranche One [Member] At the End of One Year Common stock available for issuance Vesting percentage Weighted-average period expected to recognize IPO Cost of Goods Sold Research and Development Selling, General and Administrative underwritten public offering in the aggregate gross proceeds received Stock split, description Proceeds, net of underwriting discounts and commissions Interest Expense Interest Expense, Total Interest expense Gain (Loss) on Disposition of Property Plant Equipment, Total Increase (Decrease) in Accounts Payable, Total Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Long-term Debt, Current Maturities, Total Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Accrued expenses Level 3 Balance - June 30, 2020 Liquidation Amount Shares Authorized Stock split Operating leases, rent expense Operating lease expense Accumulated Deficit Additional Paid-In Capital Temporary equity, stock issued during period shares, new issues. Temporary Equity Stock Issued During Period Shares New Issues Issuance of Series E convertible preferred stock Issuance of Series E convertible preferred stock, shares Temporary equity, issuance costs. Issuance costs Proceeds from initial public offering Underwriting discounts and commissions Warrants to purchase common stock Underwriters' Option Accumulated deficit Net loss Reserved Common Stock for Future Issuances Conversion of redeemable convertible preferred stock PPP Loan Paycheck Protection Program Loan [Member] Paycheck Protection Program loan. Deferred Offering Costs Deferred offering costs Proceeds from Short-term Debt Proceeds from Short-term Debt, Total Loan received Common stock reserved for future issuance Series B redeemable convertible preferred stock. Series D redeemable convertible preferred stock. Series E redeemable convertible preferred stock. Series A Redeemable Convertible Preferred Stock Series D Redeemable Convertible Preferred Stock Series E Redeemable Convertible Preferred Stock Issuance of options under stock plan. Issuance of Options Under Stock Plan [Member] Exercise of Options under Stock Plan Issuance of Options under Plan Series C Redeemable Convertible Preferred Stock and Warrants [Member] Series C Redeemable Convertible Preferred Stock and Warrants Series F redeemable convertible preferred stock and warrants. Series F Redeemable Convertible Preferred Stock and Warrants Class of Warrant or Right, Outstanding Warrant outstanding Accounts Payable and Other Accrued Liabilities, Current Accrued and other current liabilities Total accrued and other current liabilities Long-term Debt, Excluding Current Maturities Long-term debt Convertible preferred stock, shares authorized Convertible preferred stock, aggregate liquidation preference Fair Value Adjustment of Warrants Surgical Glaucoma Dry Eye Change in fair value of redeemable convertible preferred stock warrant Mid Cap Financial Services Revolver 2019 Revolving 2020 Senior Secured 2019 Term Loan Series F Redeemable Convertible Preferred Stock and Warrants Exercise of Options under Stock Plan Total accrued and other current liabilities Total accrued and other current liabilities Common stock issued Beginning Balance, shares Beginning Balance, shares Series A Series B Series D Series C Series E Series F Accounting for payroll protection program. Series C Redeemable Convertible Preferred Stock Series F Redeemable Convertible Preferred Stock Series A Redeemable Convertible Preferred Stock Series B Redeemable Convertible Preferred Stock Series D Redeemable Convertible Preferred Stock Series E Redeemable Convertible Preferred Stock Share-based compensation arrangement by share-based payment award, number of shares available for grant, granted in period. Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Granted in Period Share-based compensation arrangement by share-based payment award, number of shares available for grant, forfeited in period. Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Forfeited in Period Ending Balance, shares Ending Balance, shares Common stock, vote for each share. Long-term Debt, Gross Term loan. Term Loan [Member] Term Loan Principal payments due Series C Redeemable Convertible Preferred Stock and Warrants Loss from operations Loss before income tax Series F Redeemable Convertible Preferred Stock and Warrants Series F redeemable convertible preferred stock. Series C redeemable convertible preferred stock. Net cash (used in) provided by financing activities Common stock warrants, net exercised Entity File Number Subsequent Events [Text Block] Subsequent Events