v3.26.1
Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 16, 2024
Mar. 25, 2024
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Fair value of shares vested             $ 880      
Fair value of shares exercised             $ 1.1000      
Options to purchase common stock granted         169,300   894,356 0    
Weighted average grant date fair value of options granted             $ 0.99   $ 34.43  
Unrecognized compensation cost related to outstanding other than options             $ 900,000      
Unrecognized compensation cost expected to be recognized over a weighted-average period             2 years 8 months 12 days      
Stock-based compensation expense     $ 95,000 $ 16,000 $ 141,000 $ 36,000 $ 235,000 $ 541,000 $ 1,965,000  
Restricted Stock Units [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Grants Percent             100.00%      
Stock-based compensation expense             $ 150,000,000      
Fair value of restricted stock units vested             $ 1,650      
Weighted grant-date fair value         $ 0   $ 1.65      
Unrecognized compensation expense             $ 0      
Restricted Stock Awards [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Weighted grant-date fair value         $ 0   $ 0      
2018 Plan [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Shares remaining and available for issuance     685,613   685,613   854,686      
Contractual life of stock options granted         10 years   10 years      
Stock Option, Exercise Price, Decrease $ 0.0011 $ 9.9                
Incremental stock compensation charge               $ 100,000    
2018 Plan [Member] | Restricted Stock Awards [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Weighted grant-date fair value             $ 0 $ 0.0011    
2018 Plan [Member] | Board Of Directors [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Contractual life of stock options granted         10 years          
2018 Plan [Member] | Minimum [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Exercisable period of vested options         1 year   1 month      
2018 Plan [Member] | Maximum [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Exercisable period of vested options         3 months   3 months      
2018 Plan [Member] | Maximum [Member] | Board Of Directors [Member]                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares of common stock reserved     1,818,181   1,818,181         1,818,181