v3.26.3
Stock-based compensation - Additional Information (Detail) - shares
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2024
Sep. 30, 2026
Sep. 30, 2026
Dec. 31, 2023
Restricted Stock Units (RSUs) [Member]        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share based compensation by share based award equity instruments other than options granted during the period   486,930 3,103,997  
PSUs [Member]        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share based compensation by share based award equity instruments other than options granted during the period   106,600 281,600  
Share based compensation by share based award vesting percentage     50.00%  
Performance Stock Units [Member]        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share based compensation by share based award vesting period     3 years  
Share based compensation by share based award vesting percentage     50.00%  
Vesting period     3 years  
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights     50% of the PSUs granted in 2025 (the “CRG PSUs”) are subject to a performance condition, which is based on the Company’s compound revenue growth ("CRG") during three overlapping performance periods (the "Performance Periods")—calendar year 2025 ("First Performance Period"), calendar years 2025 and 2026 ("Second Performance Period"), and calendar years 2025, 2026 and 2027 ("Third Performance Period" and, together with the First Performance Period and the Second Performance Period, the "Performance Periods") and subject to a service condition of a required period of continued employment from the vesting start date. 50% of the PSUs granted in 2025 (the “TSR PSUs”) are subject to a market condition, which is based on a comparison of the Company’s total shareholder return ("TSR") to the return of the Nasdaq Composite Index during each Performance Period and subject to a service condition of a required period of continued employment from the vesting start date.  
2015 Stock Option Plan [Member]        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share based compensation by share based award number of shares authorized for issue       28,115,750
2024 Equity Incentive Plan [Member] | Incentive Stock Options [Member]        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share based compensation by share based award number of shares available for issue   22,290,000 22,290,000  
2024 Equity Incentive Plan [Member] | Common Class A [Member]        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share based compensation by share based award number of shares available for issue   7,430,000 7,430,000  
Share based compensation by share based award number of shares issued     6,128,207  
Share based compensation by share based payment award expiration date Jan. 01, 2034      
2024 Equity Incentive Plan [Member] | Class A And Class B Common Stock [Member]        
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share based compensation by share based award number of additional shares available for issue as a percentage of outstanding common stock   5.00% 5.00%