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Share-Based Compensation - Summary of Stock Option Activity under 2014 Plan and 2021 Plan (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Share-based Payment Arrangement, Disclosure [Abstract]    
Number of options, Outstanding at the beginning of the period 19,494,202  
Granted 1,552,395  
Number of options, Exercised (2,164,870)  
Number of options, Forfeited (426,122)  
Number of options, Outstanding at the end of the period 18,455,605 19,494,202
Number of options, Exercisable at the end of the period 13,432,414  
Weighted average exercise price, Outstanding at the beginning of the period $ 1.95  
Weighted average exercise price, Granted 1.61  
Weighted average exercise price, Exercised 0.95  
Weighted average exercise price, Forfeited 5.06  
Weighted average exercise price, Outstanding at the end of the period 1.97 $ 1.95
Weighted average exercise price, Exercisable at the end of the period $ 0.86  
Weighted average remaining contractual term (in years) 7 years 1 month 24 days 6 years 10 months 17 days
Weighted average remaining contractual term (in years) Exercisable at the end of the period 5 years 11 months 1 day  
Aggregate intrinsic value, Outstanding [1] $ 14,220 $ 19,214
Aggregate intrinsic value, Exercisable at the end of the period [1] $ 13,623  
[1] The aggregate intrinsic value of options outstanding and options exercisable at end of the period does not include 4,779,271 and 1,366,014 options that are out of the money, respectively.