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Share-Based Compensation - Summary of Stock Option Granted Under Equity Incentive Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Shares    
Outstanding as of December 31, 2018 2,297,810  
Granted 1,041,734  
Exercised (78,610)  
Forfeited or cancelled (291,506)  
Outstanding as of December 31, 2019 2,969,428 2,297,810
Outstanding as of December 31, 2019 - vested and expected to vest 2,969,428  
Exercisable at December 31, 2019 1,339,002  
Weighted Average Exercise Price    
Outstanding as of December 31, 2018 $ 8.03  
Granted 8.25  
Exercised 6.46  
Forfeited or cancelled 8.21  
Outstanding as of December 31, 2019 8.13 $ 8.03
Outstanding as of December 31, 2019 - vested and expected to vest 8.13  
Exercisable at December 31, 2019 $ 7.56  
Weighted Average Contractual Term    
Outstanding 7 years 11 months 8 days 8 years 9 months 7 days
Outstanding as of December 31, 2019 - vested and expected to vest 7 years 11 months 8 days  
Exercisable at December 31, 2019 7 years 29 days  
Aggregate Intrinsic Value    
Outstanding Balance $ 6,689 $ 354
Outstanding as of December 31, 2019 - vested and expected to vest 6,689  
Exercisable at December 31, 2019 $ 3,566