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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2019
Number of Options |  |  |
Balance, beginning of period (in shares) | 40,527,848 |  |
Options granted (in shares) | 0 |  |
Options exercised (in shares) | (3,258,748) |  |
Options forfeited (in shares) | (1,904,614) |  |
Balance, end of period (in shares) | 35,364,486 | 40,527,848 |
Exercisable and vested at end of period (in shares) | 32,751,775 |  |
Weighted Average Exercise Price |  |  |
Balance, beginning of period (in dollars per share) | $ 5.60 |  |
Options granted (in dollars per share) | 0 |  |
Options exercised (in dollars per share) | 1.83 |  |
Options forfeited (in dollars per share) | 6.62 |  |
Balance, end of period (in dollars per share) | 5.89 | $ 5.60 |
Exercisable and vested at end of period (in dollars per shares) | $ 5.64 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Balance, weighted-average remaining contractual life (in years) | 4 years 7 months 6 days | 5 years 1 month 6 days |
Exercisable at end of period, weighted-average remaining contractual life (in years) | 4 years 6 months |  |
Balance, aggregate intrinsic value | $ 38.8 | $ 20.2 |
Exercisable and vested at end of period, aggregate intrinsic value | $ 38.3 |  |
Closing stock price (in dollars per share) | $ 6,110,000 | $ 3,760,000 |
Outside of 2012 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options early exercised (in shares) |  |  | 1,100,000

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