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Stock-based Compensation - Additional information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2026
Dec. 31, 2025
Sep. 23, 2025
Dec. 31, 2024
Oct. 31, 2023
Sep. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Common stock       173,751   250,523,000 173,751  
Weighted-average grant-date fair value per share             $ 0.42 $ 0.27
Grant-date fair value of stock options             $ 3.3 $ 1.9
Expense related to unvested options           $ 69.2 $ 12.3  
Estimated weighted average period           2 years 7 months 6 days 2 years 4 months 24 days  
Incremental expense         $ 0.6      
Accelerated compensation cost         $ 0.3      
Share-based compensation arrangement by share-based payment award, options, forfeitures in period           1,902,000 4,780,000  
Share-based compensation arrangement by share-based payment award, options, grants in period, gross           11,308,000 18,727,000  
2018 Plan [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Common stock       2,174,985     2,174,985  
Estimated fair value of the shares       100.00%        
General vesting term for stock options       4 years        
General vesting term for stock options, award requisite service period       1 year        
2018 Plan [Member] | Maximum [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award       five        
2018 Plan [Member] | Minimum [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award       10        
2025 Equity Incentive Plan [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Stock issued during period, shares, employee benefit plan     28,195,000          
Share-based compensation arrangement by share-based payment award, options, forfeitures in period     56,100,142          
2025 Equity Incentive Plan [Member] | Subsequent Event [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Stock issued during period, shares, employee benefit plan 56,390,000              
Share-based compensation arrangement by share-based payment award, percentage of outstanding stock maximum   5.00%            
2025 Equity Incentive Plan [Member] | Share-Based Payment Arrangement [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     0          
2025 Employee Stock Purchase Plan [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Stock issued during period, shares, employee stock purchase plans     5,639,000          
Percentage of purchase price for each share offered at lesser value     85.00%          
Percentage of purchase price for each share offered     85.00%          
2025 Employee Stock Purchase Plan [Member] | Subsequent Event [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Share-based compensation arrangement by share-based payment award, percentage of outstanding stock maximum   1.00%            
2025 Employee Stock Purchase Plan [Member] | Minimum [Member] | Subsequent Event [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Stock issued during period, shares, employee stock purchase plans 11,280,000