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Stockholders' Deficit - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2021
Dec. 31, 2025
Class Of Stock [Line Items]              
Number of warrants exercised (in shares) 0 17,191,435 0        
Convertible Note | December 2024 Convertible Promissory Note | Affiliated Entity              
Class Of Stock [Line Items]              
Carrying value of debt   $ 25.0          
Debt converted, shares issued (in shares)   4,606,596          
ATM Offering Program              
Class Of Stock [Line Items]              
Proceeds from equity offerings, net of issuance costs $ 45.1   $ 98.2 $ 147.2 $ 98.2    
2023 and 2025 Warrants              
Class Of Stock [Line Items]              
Number of warrants exercised (in shares)         0    
ATM Offering Program              
Class Of Stock [Line Items]              
ATM, amount available for future issuances             $ 500.0
Common stock, value available for future stock issuance 349.2     $ 349.2      
ATM Offering Program | Maximum              
Class Of Stock [Line Items]              
Percentage of sales agent commission           3.00%  
2015 Share Repurchase Plan              
Class Of Stock [Line Items]              
Repurchase of common stock, shares (in shares)       0 0    
Remaining authorized repurchase amount $ 18.3     $ 18.3