Share-based Compensation - Summary of Stock Option Activity (Detail) - 2021 Equity Incentive Plan - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Shares, Beginning Balance	12,127,435
Granted	2,761,600
Exercised	0
Forfeiture	(720,182)
Outstanding at June 30, 2025	14,168,853
Vested and expected to vest at June 30, 2025	14,168,853
Exercisable at June 30, 2025	8,679,591
Weighted Average Exercise Price Per Share, Beginning Balance	$ 16.5
Granted	10.71
Exercised	0
Forfeiture	15.91
Weighted Average Exercise Price Per Share, Ending Balance	15.4
Weighted Average Exercise Price Per Share, Vested and expected to vest at June 30, 2025	15.4
Exercisable at June 30, 2025	$ 16.52
Weighted-Average Remaining Contractual Term, Outstanding at June 30, 2025	7 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest at June 30, 2025	7 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable at June 30, 2025	6 years 10 months 2 days
Exercised	$ 0
Outstanding at June 30, 2025 Aggregate Intrinsic Value	2
Vested and expected to vest at June 30, 2025, Aggregate Intrinsic Value	2
Exercisable at June 30, 2025	$ 0