Stock-Based Compensation - Schedule of Equity-Based Compensation Expense (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Equity-based compensation expense | $ 134,050 | $ 91,400 | $ 47,009 |
| Research and Development [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Equity-based compensation expense | 82,211 | 56,279 | 26,712 |
| General and Administrative [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||
| Equity-based compensation expense | $ 51,839 | $ 35,121 | $ 20,297 |