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Share-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Number of Shares    
Outstanding as of December 31, 2020 3,682,233  
Granted 1,019,365  
Exercised (11,514)  
Forfeited or cancelled (106,944)  
Outstanding as of March 31, 2021 4,583,140 3,682,233
Outstanding as of March 31, 2021 - vested and expected to vest 4,583,140  
Exercisable at March 31, 2021 2,097,721  
Weighted Average Exercise Price    
Outstanding as of December 31, 2020 $ 9.10  
Granted 18.90  
Exercised 7.58  
Forfeited or cancelled 13.41  
Outstanding as of March 31, 2021 11.18 $ 9.10
Outstanding as of March 31, 2021 - vested and expected to vest 11.18  
Exercisable at March 31, 2021 $ 8.11  
Weighted Average Contractual Term    
Outstanding 8 years 21 days 7 years 10 months 2 days
Outstanding as of March 31, 2021 - vested and expected to vest 8 years 21 days  
Exercisable at March 31, 2021 6 years 10 months 24 days  
Aggregate Intrinsic Value    
Outstanding as of December 31, 2020 $ 20,727 $ 37,881
Outstanding as of March 31, 2021 - vested and expected to vest 20,727  
Exercisable at March 31, 2021 $ 13,880