Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Employee Stock Option $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Beginning balance, Outstanding Stock Options | shares	13,783
Granted, outstanding stock options | shares	3,557
Exercised, Outstanding Stock Options | shares	(1,664)
Canceled and forfeited, Outstanding Stock Options | shares	(1,368)
Expired, Outstanding Stock Options | shares	(137)
Ending balance, Outstanding Stock Options | shares	14,171	13,783
Vested, outstanding stock options | shares	4,688
Exercisable, Outstanding Stock Options | shares	4,732
Weighted-Average Exercise Price Per Share, Outstanding, beginning of period | $ / shares	$ 6.39
Weighted-Average Exercise Price Per Share, Granted | $ / shares	16.23
Weighted-Average Exercise Price Per Share, Exercised | $ / shares	3.76
Weighted-Average Exercise Price Per Share, Canceled and forfeited | $ / shares	7.52
Weighted-Average Exercise Price Per Share, Expired | $ / shares	3.62
Weighted-Average Exercise Price Per Share, Outstanding, end of period | $ / shares	9.08	$ 6.39
Weighted-Average Exercise Price Per Share, Vested | $ / shares	5.64
Weighted-Average Exercise Price Per Share, Exercisable | $ / shares	$ 5.63
Weighted-Average Remaining Contractual Term, Outstanding (Years)	8 years 6 months	8 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Vested	7 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable	7 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding | $	$ 72,957	$ 146,966
Aggregate Intrinsic Value, Vested | $	36,184
Aggregate Intrinsic Value, Exercisable | $	$ 36,565