v3.26.1
Stockholders' Equity - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2022
Dec. 31, 2020
Activity Under Stock Plan [Line Items]          
Common stock, voting rights one        
Stock option, aggregate intrinsic value $ 0        
Total intrinsic value of options exercised 0 $ 100,000      
Stock options available for vested (in shares) 0 100,000      
Nonvested award, cost not yet recognized $ 600,000        
Stock compensation not yet recognized, vesting period 1 year 1 month 6 days        
General and administrative expense          
Activity Under Stock Plan [Line Items]          
Share-based payment arrangement expense $ 700,000 1,800,000      
Research and development expense          
Activity Under Stock Plan [Line Items]          
Share-based payment arrangement expense $ 300,000 500,000      
Stock Plans          
Activity Under Stock Plan [Line Items]          
Stock option plan, exercisable period 4 years        
Stock Plans | Share-based payment arrangement, nonemployee          
Activity Under Stock Plan [Line Items]          
Stock option plan, exercisable period 10 years        
Stock Plans | One year from the vesting commencement date          
Activity Under Stock Plan [Line Items]          
Stock option plan, vesting percentage 25.00%        
Vesting period 1 year        
Stock Plans | More than one year from vesting commencement date          
Activity Under Stock Plan [Line Items]          
Stock option plan, vesting percentage 2.778%        
Employee Stock | Employee Stock Purchase Plan          
Activity Under Stock Plan [Line Items]          
Purchase price of common stock 85.00%        
Number of shares authorized (in shares)     187,998   61,557
Evergreen shares reserve feature period 10 years        
Percentage of fully diluted shares of common stock 1.00%        
Increase in number of shares of authorized common stock (in shares) 123,114        
Employee Stock | Stock Plans          
Activity Under Stock Plan [Line Items]          
Common stock, shares reserved (in shares)     1,025,078    
Stock options available for grant (in shares) 195,956        
Employee Stock | 2021 Equity Incentive Plan          
Activity Under Stock Plan [Line Items]          
Number of shares authorized (in shares)       615,570  
Evergreen shares reserve feature period 10 years        
Percentage of fully diluted shares of common stock 5.00%        
Maximum percentage of share reserve, outstanding diluted stock 15.00%        
RSU awards          
Activity Under Stock Plan [Line Items]          
Vesting period 1 year 2 months 12 days        
Fair value of options vested $ 100,000 $ 400,000      
Beginning balance vested-deferred outstanding (in shares) 38,824        
Release period 60 days        
Vested (in shares) 3,063        
RSU awards | Stock Plans          
Activity Under Stock Plan [Line Items]          
Vesting period 3 years        
Requisite service period 3 years        
RSU awards | Stock Plans | Tranche two          
Activity Under Stock Plan [Line Items]          
Stock option plan, vesting percentage 33.30%        
RSU awards | Stock Plans | Tranche three          
Activity Under Stock Plan [Line Items]          
Stock option plan, vesting percentage 33.30%        
RSU awards | Stock Plans | Tranche one          
Activity Under Stock Plan [Line Items]          
Stock option plan, vesting percentage 33.30%        
RSU awards | 2021 Equity Incentive Plan          
Activity Under Stock Plan [Line Items]          
Stock compensation not yet recognized, vesting period 3 years        
Cost not yet recognized, excluding options $ 4,400,000        
Performance-based stock awards          
Activity Under Stock Plan [Line Items]          
Share-based payment arrangement expense $ 1,200,000        
Performance-based stock awards | Stock Plans | Minimum          
Activity Under Stock Plan [Line Items]          
Stock option plan, vesting percentage 0.00%        
Performance-based stock awards | Stock Plans | Maximum          
Activity Under Stock Plan [Line Items]          
Stock option plan, vesting percentage 300.00%        
Performance-based stock awards | 2021 Equity Incentive Plan          
Activity Under Stock Plan [Line Items]          
Vested (in shares) 50,800 72,200      
Share-based payment arrangement expense $ 0 $ 0