Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Stock-based Compensation - Summary of Stock Option Activity (Details)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options Outstanding at January 1, 2019 1,320,197  
Options granted 637,213  
Options exercised (72,034)  
Options forfeited (66,084)  
Options cancelled 0  
Options Outstanding at June 30, 2019 1,819,292 1,320,197
Outstanding at January, 1, 2019, 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 0.77  
Options forfeited, Weighted average exercise price per share | $ / shares 1.53  
Outstanding at June 30, 2019, Weighted average exercise price per share | $ / shares $ 4.30 $ 0.77
Outstanding, Weighted average remaining contractual life (in years) 8 years 2 months 26 days 7 years 11 months 26 days
Outstanding, Aggregate Intrinsic Value | $ $ 15,331 $ 8,465
Options Vested and expected to vest 1,819,292  
Options Vested 1,115,256  
Vested and expected to vest, Weighted average exercise price per share | $ / shares $ 4.30  
Vested, Weighted average exercise price per share | $ / shares $ 2.84  
Vested and expected to vest, Weighted average remaining contractual life (in years) 8 years 2 months 26 days  
Vested, Weighted average remaining contractual life (in years) 7 years 6 months 29 days  
Vested and expected to vest, Aggregate Intrinsic Value | $ $ 15,331  
Vested, Aggregate Intrinsic Value | $ $ 11,026