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Stock-Based Compensation Plans - Additional Information (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 48 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Jul. 07, 2025
tranche
$ / shares
shares
Jun. 04, 2025
shares
Mar. 04, 2024
$ / shares
shares
Jan. 08, 2024
Jun. 28, 2023
shares
Aug. 01, 2021
shares
Apr. 25, 2021
shares
Jul. 31, 2019
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Dec. 31, 2023
shares
Sep. 30, 2017
shares
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) | $ / shares       $ 1.72                      
Share-based payment arrangement | $                       $ 1,200,000      
Repricing cost during the period | $                   $ 0 $ 86,000 $ 100,000 $ 1,000,000    
Expected dividend yield       0.00% 0.00%             0.00%      
Options exercisable (in shares)   5,000,000                          
Series A Warrants                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Options exercisable (in shares)   10,000,000                          
Options issued (in shares)   86,666,667                          
Grant-date fair value (in usd per share) | $ / shares $ 0.326                 $ 0.326   $ 0.326      
Series B Warrants                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Options exercisable (in shares)   10,000,000                          
Options issued (in shares)   86,666,667                          
Grant-date fair value (in usd per share) | $ / shares 0.394                 0.394   0.394      
January 2024 Pre-Funded Warrants | Tranche 2                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Options exercisable (in shares)   5,000,000                          
Options issued (in shares)   46,620,046                          
Grant-date fair value (in usd per share) | $ / shares 0.013                 0.013   0.013      
January 2024 Pre-Funded Warrants | Tranche 3                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Options exercisable (in shares)   5,000,000                          
Options issued (in shares)   46,620,046                          
Grant-date fair value (in usd per share) | $ / shares $ 0.013                 0.013   0.013      
SARs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Expected dividend yield 0.00% 0.00%                          
Authorized (in shares)   35,000,000                          
Options exercisable, ending balance (in usd per share) | $ / shares   $ 0.765                          
Number of tranches | tranche   5                          
Grant-date fair value (in usd per share) | $ / shares $ 0.404                 $ 0.404   $ 0.404      
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) | $ / shares       $ 3.00                      
Maximum | SARs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Expected term of options (in years) 2 years 9 months 18 days 2 years 10 months 24 days                          
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) | $ / shares       $ 1.72                      
Minimum | SARs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Expected term of options (in years) 10 months 24 days 1 year                          
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 24,000 $ 70,000 $ 24,000    
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) | $ / shares                       $ 0.67 $ 0.99    
Total unrecognized compensation expense | $ $ 13,900,000                 13,900,000   $ 13,900,000      
Period over which compensation cost will be recognized (in years)                       3 years      
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                  
SARs Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Share-based compensation expense | $                   1,500,000   $ 1,500,000      
Total unrecognized compensation expense | $ $ 7,800,000                 $ 7,800,000   $ 7,800,000      
Period over which compensation cost will be recognized (in years)                       1 year 3 months 21 days      
2014 Equity Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares available for grant (in shares) 0                 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