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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, 2020
Dec. 31, 2019
Number of Shares    
Outstanding as of December 31, 2019 2,969,428  
Granted 810,828  
Exercised (91,396)  
Forfeited or cancelled (37,768)  
Outstanding as of March 31, 2020 3,651,092 2,969,428
Outstanding as of March 31, 2020 - vested and expected to vest 3,651,092  
Exercisable at March 31, 2020 1,514,383  
Weighted Average Exercise Price    
Outstanding as of December 31, 2019 $ 8.13  
Granted 9.30  
Exercised 5.90  
Forfeited or cancelled 11.13  
Outstanding as of March 31, 2020 8.42 $ 8.13
Outstanding as of March 31, 2020 - vested and expected to vest 8.42  
Exercisable at March 31, 2020 $ 7.55  
Weighted Average Contractual Term    
Outstanding 7 years 11 months 8 days 7 years 11 months 8 days
Outstanding as of March 31, 2020 - vested and expected to vest 8 years 4 months 20 days  
Exercisable at March 31, 2020 7 years 7 months 6 days  
Aggregate Intrinsic Value    
Outstanding as of December 31, 2019 $ 6,996 $ 6,689
Outstanding as of March 31, 2020 - vested and expected to vest 6,996  
Exercisable at March 31, 2020 $ 2,298,901