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Stock-Based Compensation Plans - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 48 Months Ended
Jun. 04, 2025
Mar. 04, 2024
Jan. 08, 2024
Jun. 28, 2023
Aug. 01, 2021
Apr. 25, 2021
Jul. 31, 2019
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Options repriced (in shares)   3,317,596                      
Stock-based compensation, exercise price (in usd per share)   $ 1.72                      
Share-based payment arrangement                   $ 1,200,000      
Repricing cost during the period               $ 52,000 $ 17,000 $ 100,000 $ 1,000,000    
Expected dividend yield   0.00% 0.00%             0.00%      
General and administrative                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Share-based compensation expense               28,000 9,000 $ 56,000 600,000    
Research and development                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Share-based compensation expense               24,000 8,000 49,000 300,000    
Maximum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expected term of options (in years)   4 years 7 months 28 days 4 years 9 months 21 days                    
Exercised (in usd per share)   $ 3.00                      
Minimum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expected term of options (in years)   1 year 7 months 28 days 1 year 9 months 21 days                    
Exercised (in usd per share)   $ 1.72                      
2021 Employee stock purchase plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Maximum annual contributions per employee (as a percent)           15.00%              
Purchase price of the stock, at discount from market price at purchase date (as a percent)           85.00%              
Shares available for grant (in shares)   1,200,000       200,000              
Additional shares authorized (in shares)   1,000,000                      
Shares issued under the ESPP (in shares)         491,839                
Share-based compensation expense               22,000 0 $ 48,000 $ 0    
2019 Omnibus Equity Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares available for grant (in shares)             1,500,000            
Expected term of options (in years)                   5 years 10 months 28 days 5 years 11 months 12 days    
Expected dividend yield                   0.00% 0.00%    
Options granted in period, weighted-average grant date fair value (in usd per share)                   $ 0.67 $ 0.98    
Total unrecognized compensation expense               $ 15,600,000   $ 15,600,000      
Period over which compensation cost will be recognized (in years)                   3 years 1 month 28 days      
2019 Omnibus Equity Incentive Plan | Incentive stock options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)                   4 years      
2019 Omnibus Equity Incentive Plan | Maximum                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expected term of options (in years)                   10 years      
2019 Omnibus Equity Incentive Plan | Maximum | Non-statutory options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)                   4 years      
2019 Omnibus Equity Incentive Plan | Minimum | Non-statutory options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)                   3 years      
2019 Omnibus Equity Incentive Plan, Evergreen Provision                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Additional shares authorized (in shares)             4,900,000         4,408,871  
Additional shares authorized (as a percent)             4.00%            
Increase in other share (in shares) 7,000,000 9,100,000   4,440,000                  
2014 Equity Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares available for grant (in shares)               0   0      
2017 Inducement Equity Incentive Plan                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares available for grant (in shares)                         46,250
Share-based compensation expense               $ 0 $ 0 $ 0 $ 0