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Stock-based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Mar. 28, 2024
Dec. 31, 2023
Mar. 20, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock shares reserved for future issuance   7,147,658   7,147,658        
Common stock, shares issued   10,761,917   10,761,917     5,754,505  
Stock issued on exercise of stock options, Shares       12,852        
Number of options, forfeited       228,475        
Number of options, granted       1,226,500        
Acceleration of stock awards       $ 10,500        
Research and Development                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock-based compensation expense   $ 273 $ 184 634 $ 2,426      
General and Administrative                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock-based compensation expense   $ 508 $ 298 $ 1,047 9,645      
Graybug                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Acceleration of stock awards         10,500      
Graybug | Research and Development                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock-based compensation expense         1,900      
Graybug | General and Administrative                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock-based compensation expense         $ 8,600      
2020 Equity Incentive Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Number of shares unavailable for grant (shares)   223,743   223,743        
2006 Equity Incentive Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Expiration period       10 years        
Award vesting rights, percentage       25.00%        
Award vesting period       1 year        
Vesting period       36 months        
2023 Equity Incentive Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock shares reserved for future issuance   948,049   948,049   1,500,000   1,000,000
Percentage of aggregate number of shares of common stock outstanding on last day of preceding year added to plan       5.00%        
Number of options, forfeited       228,475        
Increase in number of shares reserved for issuance 287,725              
Shares available for grant (shares)   948,049   948,049        
2023 Employee Stock Purchase Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock shares reserved for future issuance   122,545   122,545        
Common stock shares reserved for future issuance, initial   65,000   65,000        
Weighted averagefair value options, granted       $ 4.17 $ 4.47      
Total fair value of shares vested       $ 1,600 $ 12,100      
Common stock, shares issued   195,000   195,000        
Stock issued on exercise of stock options, Shares       12,852        
Percentage of aggregate number of shares of common stock outstanding on last day of preceding year added to plan       1.00%        
Increase in number of shares reserved for issuance       57,545        
Stock Issued       0        
Total unrecognized stock-based compensation expenses related to outstanding unvested stock awards   $ 5,000   $ 5,000        
Total unrecognized stock-based compensation expenses related to outstanding unvested stock awards weighted-average term of recognition       2 years 9 months 18 days