Stock Incentive Plans - Summary of Share-based Compensation Arrangements by Share-based Payment Award (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Share-based Payment Arrangement [Abstract]
Shares - Beginning Balance	55,644,495
Shares - Exercised	(3,968,080)
Shares - Forfeited and canceled	(104,631)
Shares - Ending Balance	51,571,784	55,644,495
Shares - Exercisable	42,596,197
Shares - Vested and expected to vest	51,198,336
Weighted- Average Exercise Price - Beginning Balance	$ 2.95
Weighted- Average Exercise Price - Exercised	2.69
Weighted- Average Exercise Price - Forfeited and canceled	3.69
Weighted- Average Exercise Price - Ending Balance	2.97	$ 2.95
Weighted- Average Exercise Price - Exercisable	2.75
Weighted- Average Exercise Price - Vested and expected to vest	$ 2.95
Weighted-Average Remaining Contractual Life (in years)	5 years 9 months 18 days	6 years
Weighted-Average Remaining Contractual Life (in years) - Exercisable	5 years 7 months 6 days
Weighted-Average Remaining Contractual Life (in years) - Vested and expected to vest	5 years 9 months 18 days
Aggregate Intrinsic Value - Beginning Balance	$ 469,591
Aggregate Intrinsic Value - Ending Balance	416,210	$ 469,591
Aggregate Intrinsic Value - Exercisable	353,208
Aggregate Intrinsic Value - Vested and expected to vest	$ 414,180