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Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2023
Sep. 16, 2020
Aug. 31, 2025
May 31, 2023
Feb. 28, 2022
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2023
Jan. 01, 2025
Dec. 31, 2024
Dec. 12, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Grants               18,599,976          
Shares available for grant                       3,701,130  
Stock options were exercised during the period           $ 76,000 $ 38,000 $ 197,000 $ 40,000        
Percentage of common stock price purchased through payroll deductions         85.00%                
Percentage of payroll deductions of employee's compensation during offering period         15.00%                
Maximum number of shares employees may purchase during offering period         1,800                
Stock-based compensation expense           3,285,000 $ 3,357,000 $ 9,769,000 $ 9,887,000        
Employee Stock Purchase Plan (ESPP)                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Common stock reserved for future issuance   724,000                 724,000    
Share-based payment award, expiration period   10 years                      
Share-based payment award, expiration date   Jan. 01, 2030                      
Percentage of automatic increase every year in common stock shares reserved for future issuance   1.00%                      
Share-based payment award, terms of award issuance               the number of shares of common stock that are automatically added on January 1st of each year for a period of up to ten years, commencing on the first January 1 following the IPO and ending on (and including) January 1, 2030, in an amount equal to the lesser of (i) one percent (1.0%) of the total number of shares of capital stock outstanding on December 31st of the preceding calendar year, and (ii) 724,000 shares of common stock.          
Number of shares of common stock issued under ESPP               358,514          
Employee Stock Purchase Plan (ESPP) | Maximum                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Number of shares authorized for issuance   362,000                      
Restricted Stock Units                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, compensation cost not yet recognized, weighted-average period of recognition               2 years 8 months 12 days          
Share-based payment award, RSU/RSA granted               3,330,992          
Share-based payment award, unvested RSU/RSA granted, compensation cost not yet recognized           8,800,000   $ 8,800,000          
Performance-Based Restricted Stock Units                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Common stock reserved for future issuance     3,875,288                    
Share-based payment award, RSU/RSA granted     5,765,000                    
Stock Options                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, options granted               9,503,984          
Share-based payment award, options, compensation cost not yet recognized           $ 19,600,000   $ 19,600,000          
Share-based payment award, compensation cost not yet recognized, weighted-average period of recognition               2 years 7 months 6 days          
Exercised, Stock Options               110,228          
Outstanding performance and market-based options           23,586,911   23,586,911       16,220,605  
New Plan                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Common stock reserved for future issuance                     10,247,165    
Grants               15,959,976          
Shares available for grant                       701,430  
Share-based payment award, expiration period   10 years                      
Share-based payment award, commencement date   Jan. 01, 2021                      
Share-based payment award, expiration date   Jan. 01, 2030                      
Percentage of automatic increase every year in common stock shares reserved for future issuance   5.00%                      
Share-based payment award, terms of award issuance               The number of shares of common stock reserved for issuance under the New Plan automatically increases on January 1 of each year, for a period of ten years, from January 1, 2021, continuing through January 1, 2030, by 5% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year, or a lesser number of shares as may be determined by the Company’s board of directors (the “New Plan Evergreen Provision”).          
New Plan | Restricted Stock Units                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, RSU/RSA granted               3,330,992          
New Plan | Restricted Stock Units | Maximum                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Award vesting period               4 years          
New Plan | Restricted Stock Units | Minimum                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Award vesting period               1 year          
New Plan | Performance-Based Restricted Stock Units                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Grant date fair value of issued units not yet recognized     $ 17,300,000                    
Unvested and Outstanding units           5,765,000   5,765,000          
Share-based payment award, RSU/RSA granted     5,765,000                    
Stock-based compensation expense           $ 0              
New Plan | Performance Stock Options                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, options granted 70,235                        
Stock options were exercised during the period               $ 1,065          
Outstanding performance and market-based options           57,281   57,281          
Inducement Plan                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Common stock reserved for future issuance           4,000,000   4,000,000         2,000,000
Grants               2,640,000          
Shares available for grant                       2,999,700  
Inducement Plan | Stock Options                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, options granted           345,000              
Share-based payment award, options, weighted-average grant date fair value           $ 2.09              
Original Options | Performance Stock Options                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, options granted       2,166,653                  
Award vesting period       3 years 7 months 6 days                  
Share-based payment award, options, weighted-average grant date fair value       $ 0.5                  
Stock-based compensation expense       $ 0                  
Modified Options | Performance Stock Options                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, options granted                   1,516,655      
Award vesting period               3 years          
Share-based payment award, options, weighted-average grant date fair value                   $ 1.28      
Share-based payment award, options, compensation cost not yet recognized           $ 300,000   $ 300,000          
Share-based payment award, compensation cost not yet recognized, weighted-average period of recognition               1 year          
Stock options were exercised during the period               $ 0          
Stock-based compensation expense           $ 100,000   $ 400,000          
Exercised, Stock Options               53,545          
Outstanding performance and market-based options           1,463,110   1,463,110          
Performance and market-based options vested           452,007   452,007          
New Plan and Inducement Plan | Stock Options                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Share-based payment award, expiration period               10 years          
Share-based payment award, options granted               9,503,984          
Share-based payment award, options, weighted-average grant date fair value               $ 1.44          
New Plan and Inducement Plan | Stock Options | Maximum                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Award vesting period               4 years          
New Plan and Inducement Plan | Stock Options | Minimum                          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                          
Award vesting period               1 year