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Equity-based Compensation and Equity Incentive Plans - Schedule of Stock Option Activity Under 2015 and 2017 Plan (Detail) - 2015 and 2017 Plan - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding Beginning balance, Number of options 2,286,419  
Granted, Number of options 1,052,113  
Forfeited, Number of options (86,073)  
Outstanding Ending balance, Number of options 3,252,459  
Number of options, Vested or expected to vest 3,252,459  
Number of options, Exercisable 919,285  
Beginning balance, Weighted-average price $ 9.24  
Granted, Weighted-average price 1.77  
Forfeited, Weighted-average price 9.30  
Ending balance, Weighted-average price 6.82  
Weighted-average price Vested or expected to vest 6.82  
Weighted-average price, Exercisable $ 11.26  
Outstanding, weighted average remaining contractual term (Year) 8 years 10 months 24 days 8 years 8 months 12 days
Weighted average remaining contractual term, Vested or expected to vest 8 years 10 months 24 days  
Weighted average remaining contractual term, Exercisable 8 years  
Beginning balance, Aggregate Intrinsic value $ 43  
Forfeited, Aggregate Intrinsic value 1  
Ending balance, Aggregate Intrinsic value 18  
Aggregate Intrinsic value, Vested or expected to vest at March 31, 2020 $ 18