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Stock-Based Compensation - Additional Information (Details)
3 Months Ended 6 Months Ended
Apr. 30, 2026
USD ($)
shares
Jun. 30, 2026
USD ($)
Installment
$ / shares
shares
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Installment
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Jan. 31, 2026
shares
Dec. 31, 2025
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Number of options   12,233,799   12,233,799     8,569,619  
Exercise price | $ / shares   $ 8.55   $ 8.55     $ 4.6  
Number of stock options granted       4,211,692        
Stock-based compensation expense | $   $ 36,863,000 $ 1,756,000 $ 39,432,000 $ 3,375,000      
Common Stock [Member] | 2026 Equity incentive plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Common stock, initially reserved for issuance           6,020,000    
Common Stock [Member] | 2026 Employee stock purchase plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Common stock, initially reserved for issuance 510,000 0   0        
Board of Directors and Chief Executive Officer | 2026 Equity incentive plan                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Number of stock options granted   687,816            
Fully vested equity awards granted 2,477,978              
Stock ownership percentage 12.50%              
Non-cash stock-based compensation expense | $ $ 32,200,000 $ 2,100,000            
Equity Incentive Plans                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Number of options               152,514
Cliff vesting period       1 year        
Vesting period for stock options issued under the plan       4 years        
Equity Incentive Plans | Performance-Based Options                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Exercise price | $ / shares               $ 7.39
Number of stock options granted       76,256        
Shares available for future grants               228,770
Number of annual installments vested | Installment   3   3        
Stock-based compensation expense | $       $ 600,000        
Equity Incentive Plans | Stock Option Activity                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Unrecognized stock-based compensation expense | $   $ 24,600,000   $ 24,600,000        
Unrecognized stock-based compensation expense, remaining weighted average period       2 years 7 months 6 days        
Weighted-average grant date fair value of options granted | $ / shares       $ 11.88 $ 5.66      
2024 Plan Restricted Stock Awards | Board of Directors and Chief Executive Officer                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Restricted stock awards, granted       1,990,001        
2024 Plan Restricted Stock Awards | Service-Based Vesting | Board of Directors and Chief Executive Officer                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Vesting period for stock options issued under the plan       3 years        
Restricted stock awards, granted       796,000        
2024 Plan Restricted Stock Awards | Performance Based Vesting | Board of Directors and Chief Executive Officer                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Restricted stock awards, granted       1,194,001        
2024 Plan Restricted Stock Awards | Unvested Amount Subject to Accelerated Vesting Upon Close of Series B Financing | Board of Directors and Chief Executive Officer                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Unvested amounts, percentage       50.00%        
2024 Plan Restricted Stock Awards | Restricted Stock Awards                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Unrecognized stock-based compensation expense | $   0   $ 0        
Restricted stock awards, granted       0 0      
Total fair value of restricted stock awards, vested | $       $ 500,000 $ 100,000      
Stock-based compensation expense | $   $ 100,000 $ 100,000 $ 500,000 $ 100,000      
2024 Plan Restricted Stock Awards | Restricted Stock Awards | Unvested Amount Subject to Future Acceleration Upon Close of Initial Public Offering | Board of Directors and Chief Executive Officer | IPO                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Unvested amounts, percentage       50.00%