v3.25.0.1
Stock-based compensation - Schedule of Restricted Stock Awards (Detail)
 12 Months Ended
Dec. 31, 2024
$ / shares
shares
Restricted Stock Awards [Member]  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Beginning balance 4,250,000
Converted into Class A voting common stock (4,250,000)
Ending balance 0
Beginning balance | $ / shares $ 0.42
Weighted - Average Grant Date Fair Value, Converted into Class A voting common stock | $ / shares 0.42
Ending balance | $ / shares $ 0
Restricted [Member]  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Beginning balance 0
Converted into Class A voting common stock 0
Ending balance 0
Unrestricted [Member]  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Beginning balance 4,250,000
Converted into Class A voting common stock (4,250,000)
Ending balance 0