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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding Beginning balance, Number of options 1,739,884  
Granted, Number of options 1,427,030  
Cancelled or Forfeited, Number of options (880,495)  
Outstanding Ending balance, Number of options 2,286,419 1,739,884
Number of options, Vested or expected to vest 2,286,419  
Number of options, Exercisable 845,102  
Beginning balance, Weighted-average price $ 11.92  
Granted, Weighted-average price 7.07  
Cancelled or Forfeited, Weighted-average price 11.02  
Ending balance, Weighted-average price 9.24 $ 11.92
Weighted-average price Vested or expected to vest 9.24  
Weighted-average price, Exercisable $ 11.43  
Outstanding, weighted average remaining contractual term (Year) 8 years 8 months 12 days 9 years
Weighted average remaining contractual term, Vested or expected to vest 8 years 8 months 12 days  
Weighted average remaining contractual term, Exercisable 8 years 1 month 6 days  
Cancelled or Forfeited, Aggregate Intrinsic value $ 25  
Ending balance, Aggregate Intrinsic value 43  
Aggregate Intrinsic value, Vested or expected to vest at December 31, 2019 $ 43