Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Summary of Stock Option Activity (Details)

v3.19.3
Stock-based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options Outstanding 1,320,197  
Options granted 637,213  
Options exercised (85,559)  
Options forfeited (150,730)  
Options cancelled 0  
Options Outstanding 1,721,121 1,320,197
Options Vested and expected to vest at September 30, 2019 1,721,121  
Options Vested at September 30, 2019 1,139,418  
Outstanding, Weighted average exercise price per share | $ / shares $ 0.77  
Options granted, Weighted average exercise price per share | $ / shares 10.94  
Options exercised, Weighted average exercise price per share | $ / shares 0.81  
Options forfeited, Weighted average exercise price per share | $ / shares 6.64  
Outstanding, Weighted average exercise price per share | $ / shares 4.02 $ 0.77
Vested and expected to vest at September 30, 2019, Weighted average exercise price per share | $ / shares 4.02  
Vested at September 30, 2019, Weighted average exercise price per share | $ / shares $ 2.72  
Outstanding, Weighted average remaining contractual life (in years) 7 years 11 months 4 days 7 years 11 months 26 days
Vested and expected to vest at September 30, 2019, Weighted average remaining contractual life (in years) 7 years 11 months 4 days  
Vested at September 30, 2019, Weighted average remaining contractual life (in years) 7 years 3 months 29 days  
Outstanding, Aggregate Intrinsic Value | $ $ 2,541 $ 8,465
Vested and expected to vest at September 30, 2019, Aggregate Intrinsic Value | $ 2,541  
Vested at September 30, 2019, Aggregate Intrinsic Value | $ $ 1,993