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Common Stock - Summary of Stock Option Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Granted 1,000  
Incentive Stock Options    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning balance 3,733,544  
Granted 1,000  
Exercised (756,540)  
Canceled (597,834)  
Ending balance 2,380,170 3,733,544
Number of shares, vested and exercisable 1,500,147 1,648,917
Weighted average exercise price, beginning balance $ 4.53  
Weighted average exercise price, granted 13.89  
Weighted average exercise price, exercised 3.31  
Weighted average exercise price, canceled 6.24  
Weighted average exercise price, ending balance 4.49 $ 4.53
Weighted average exercise price, vested and exercisable $ 3.63 $ 2.89
Weighted average remaining contractual term 7 years 2 months 12 days 7 years 10 months 24 days
Weighted average remaining contractual term, vested and exercisable 6 years 7 months 6 days 6 years 8 months 12 days
Aggregate intrinsic value $ 19,745 $ 25,386
Aggregate intrinsic value, vested and exercisable $ 13,736 $ 13,924