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Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Senior Secured Two Thousand Nineteen Term Loan [Member] Senior secured 2019 term loan. Senior Secured 2019 Term Loan Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Warrants and Rights Outstanding Unused warrants value Common stock, par value $0.001 per share; 200,000,000 shares authorized; 50,398,148 and 49,131,363 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively Common Stock, Value, Issued Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Accrued compensation Increase (Decrease) in Employee Related Liabilities Increase (Decrease) in Employee Related Liabilities, Total Unrealized Losses Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss Unrealized Losses Unrealized Losses Number of votes entitled per share of common stock Common Stock Vote for Each Share Common stock, vote for each share. 2027 2025 Long-Term Debt, Maturity, Year Three Temporary equity, stock issued during period shares, new issues. 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Surgical Glaucoma Measurement Frequency Measurement Frequency [Domain] Redeemable convertible preferred stock, shares outstanding Temporary Equity, Shares Outstanding Shares Outstanding Beginning Balance, shares Ending Balance, shares Options Granted Merit Awards [Member] Options Granted Merit Awards Options granted merit awards. Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] PPP Loan Paycheck Protection Program Loan [Member] Paycheck Protection Program loan. Subsequent Events Subsequent Events [Text Block] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Deferred initial public offering cost recorded to additional paid in capital Total deferred costs Deferred Offering Costs Deferred offering costs Accounts receivable, net of allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Fair Value Of Warrants Fair value of warrants. 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