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Stockholders' Equity - Additional Information (Detail)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Dec. 08, 2023
$ / shares
shares
Jan. 31, 2023
shares
Mar. 31, 2025
shares
Dec. 31, 2024
shares
Apr. 30, 2024
shares
Dec. 31, 2023
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Class of Stock [Line Items]              
Preferred stock shares authorized     20,000,000        
Allen and Company LLC [Member] | Warrants Convertible Into Class A Common Stock [Member]              
Class of Stock [Line Items]              
Class of warrants or rights number of securities covered by warrants or rights 150,000            
Class of warrants or rights exercise price | $ / shares $ 10            
Common Class A [Member]              
Class of Stock [Line Items]              
Common stock shares authorized     1,000,000,000 1,000,000,000 204,590,500 200,228,024  
Common Class A [Member] | Exercise of Warrants [Member]              
Class of Stock [Line Items]              
Stock issued during period shares new issues 109,459            
Common Class A [Member] | Master Services Agreement With Astra Zeneca As Amended [Member]              
Class of Stock [Line Items]              
Class of warrants value of shares covered by warrants or rights | $             $ 100
Class of warrants or rights number of securities covered by warrants or rights             2,702,703
Class of warrants or rights exercise price | $ / shares             $ 37
Common Class B [Member]              
Class of Stock [Line Items]              
Common stock shares authorized     5,500,000 5,500,000   5,374,899  
Stockholders equity stock split     1        
Duration before which shares may be converted from one class to another     20 years        
Share holding below which trigger is caused for conversion of stock from one class to another     10,000,000        
Common Class B [Member] | Maximum [Member]              
Class of Stock [Line Items]              
Number of days for determining conversion of stock from class to another     150 days        
Number of days for determining ownership of the founder below which conversion of stock from one class to another is triggered     150 days        
Common Class B [Member] | Minimum [Member]              
Class of Stock [Line Items]              
Number of days for determining conversion of stock from class to another     90 days        
Number of days for determining ownership of the founder below which conversion of stock from one class to another is triggered     90 days        
Non-voting Common Stock [Member]              
Class of Stock [Line Items]              
Common stock shares authorized     0 0   66,946,627  
Non-voting Common Stock [Member] | Treasury Stock, Common [Member]              
Class of Stock [Line Items]              
Stock repurchased during the period shares   145,466