v3.26.1
Stockholders' Deficit - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Aug. 04, 2026
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Class of Stock [Line Items]                
Common stock issued under exercise of stock options (in shares)             70,876  
Shares, new issues (in shares)             70,876  
Maximum contractual term of stock options             10 years  
Share-based compensation expense   $ 3.3     $ 3.8   $ 7.0 $ 8.0
Cash dividend declared per share (in dollars per share)   $ 0.20 $ 0.20 $ 0.20 $ 0.1975 $ 0.20    
Dividends, common stock     $ 3.6 $ 3.3        
Subsequent Event                
Class of Stock [Line Items]                
Cash dividend declared per share (in dollars per share) $ 0.20              
Shares to be issued under stock bonus program                
Class of Stock [Line Items]                
Granted (in shares)         566,359     566,359
Share-based payment arrangement, expense   $ 1.3     $ 1.2   $ 2.3 $ 2.1
Performance-Based Stock Option                
Class of Stock [Line Items]                
Granted (in shares)             280,129  
Performance-Based Stock Option | Minimum                
Class of Stock [Line Items]                
Grant date fair value of restricted stock (in dollars per share)             $ 0.82  
Performance-Based Stock Option | Maximum                
Class of Stock [Line Items]                
Grant date fair value of restricted stock (in dollars per share)             $ 0.97  
Restricted stock awards                
Class of Stock [Line Items]                
Shares granted (in shares)             140,911  
Restricted stock awards | Non Employee Directors                
Class of Stock [Line Items]                
Shares granted (in shares)             120,150  
Restricted stock awards | Non Employee Directors | Minimum                
Class of Stock [Line Items]                
Award vesting period (in years)             1 year  
Restricted stock awards | Non Employee Directors | Maximum                
Class of Stock [Line Items]                
Award vesting period (in years)             3 years  
Market conditions                
Class of Stock [Line Items]                
Shares granted (in shares)             890,030  
Market conditions | Minimum                
Class of Stock [Line Items]                
Grant date fair value of restricted stock (in dollars per share)             $ 2.06  
Market conditions | Minimum | With Grant Date Fair Value Ranging From 2.30 to 2.95                
Class of Stock [Line Items]                
Award vesting period (in years)             3 years  
Market conditions | Maximum                
Class of Stock [Line Items]                
Grant date fair value of restricted stock (in dollars per share)             $ 3.63  
Service conditions                
Class of Stock [Line Items]                
Shares granted (in shares)             582,482  
Service conditions | Non Employee Directors | Maximum                
Class of Stock [Line Items]                
Award vesting period (in years)             3 years  
Bonus Shares                
Class of Stock [Line Items]                
Shares granted (in shares)             871,452  
Shares expected to be issued under the 2021 Employee Stock Purchase Plan | 2021 Employee Stock Purchase Plan | Class A                
Class of Stock [Line Items]                
ESPP shares issued (in shares)             37,671  
Stock options                
Class of Stock [Line Items]                
Compensation cost not yet recognized   1.5         $ 1.5  
Compensation cost not yet recognized, period for recognition             3 years 7 months 6 days  
Stock options | With Grant Date Fair Value of $1.00                
Class of Stock [Line Items]                
Granted (in shares)             250,000  
Grant date fair value of restricted stock (in dollars per share)             $ 1.00  
Award vesting period (in years)             3 years  
Maximum contractual term of stock options             10 years  
Stock options | With Grant Date Fair Value of $1.10                
Class of Stock [Line Items]                
Granted (in shares)             83,340  
Grant date fair value of restricted stock (in dollars per share)             $ 1.10  
Award vesting period (in years)             3 years  
Maximum contractual term of stock options             10 years  
Restricted stock units                
Class of Stock [Line Items]                
Compensation cost not yet recognized   $ 5.5         $ 5.5  
Compensation cost not yet recognized, period for recognition             1 year 8 months 12 days