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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Number of Shares Outstanding 7,266,185    
Number of Shares Granted 100,000 78,111  
Number of Shares Canceled / forfeited (11,150)    
Number of Shares Exercised (91,045)    
Number of Shares Outstanding 7,263,990   7,266,185
Number of Shares Options Exercisable 5,736,926    
Number of Shares Options vested or expected to vest 7,025,841    
Weighted Average Exercise Price Outstanding $ 1.92    
Weighted Average Exercise Price Granted 7.08    
Weighted Average Exercise Price Cancelled / forfeited 2.87    
Weighted Average Exercise Price Exercised 1.77    
Weighted Average Exercise Price Outstanding 1.99   $ 1.92
Weighted Average Exercise Price Options Exercisable 1.59    
Weighted Average Exercise Price Options Vested or Expected to Vest $ 1.91    
Weighted Average Remaining Contractual Term (in years) Outstanding 5 years 3 months 21 days   5 years 10 months 20 days
Weighted Average Remaining Contractual Term (in years) Options Exercisable 4 years 8 months 8 days    
Weighted Average Remaining Contractual Term (in years) Options Vested or Expected to Vest 5 years 2 months 12 days    
Aggregate Intrinsic Value Outstanding $ 33,359   $ 33,909
Aggregate Intrinsic Value Options Exercised 382    
Aggregate Intrinsic Value Options Exercisable 28,546    
Aggregate Intrinsic Value Options Vested or Expected to Vest $ 32,797