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Stock-based Compensation - Summary of Share Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Number outstanding 15,449,513 15,955,892
Weighted average exercise price $ 0.73 $ 0.71
Number of Options, exercisable 11,449,733  
Weighted- Average Exercise price, exercisable $ 0.68  
Aggregate intrinsic value $ 1  
Range Of Exercise Price One [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Lower Range Limit $ 0.15  
Upper Range Limit $ 0.86  
Number outstanding 15,403,350  
Weighted average remaining contractual term 6 years 1 month 13 days  
Weighted average exercise price $ 0.72  
Aggregate intrinsic value $ 107,517  
Number of Options, exercisable 11,416,017  
Weighted average remaining contractual term 5 years 3 months 14 days  
Weighted- Average Exercise price, exercisable $ 0.67  
Aggregate intrinsic value $ 80,243  
Range Of Exercise Price Two [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Upper Range Limit $ 1.87  
Number outstanding 5,963  
Weighted average remaining contractual term 9 years 10 days  
Weighted average exercise price $ 1.87  
Aggregate intrinsic value $ 35  
Range Of Exercise Price Three [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Upper Range Limit $ 2.10  
Number outstanding 33,126  
Weighted average remaining contractual term 2 years 8 months 8 days  
Weighted average exercise price $ 2.10  
Aggregate intrinsic value $ 186  
Number of Options, exercisable 33,126  
Weighted average remaining contractual term 2 years 8 months 8 days  
Weighted- Average Exercise price, exercisable $ 2.10  
Aggregate intrinsic value $ 186  
Range Of Exercise Price Four [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Upper Range Limit $ 9.07  
Number outstanding 7,074  
Weighted average remaining contractual term 9 years 11 months 12 days  
Weighted average exercise price $ 9.07  
Number of Options, exercisable 590  
Weighted average remaining contractual term 9 years 11 months 12 days  
Weighted- Average Exercise price, exercisable $ 9.07