Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Summary of Outstanding Stock Option Activity (Details)

v3.19.3.a.u2
Stock Based Compensation - Summary of Outstanding Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Number of shares, Beginning balance 1,407,000  
Number of shares, Granted 782,000  
Number of shares, Exercised (176,000)  
Number of shares, Expired/Forfeited (413,000)  
Number of shares, Ending balance 1,600,000 1,407,000
Number of shares, Vested and exercisable 746,000  
Number of shares, Vested and expected to vest 1,600,000  
Weighted average exercise price, Beginning balance $ 8.73  
Weighted average exercise price, Granted 11.77  
Weighted average exercise price, Exercised 4.20  
Weighted average exercise price, Expired/Forfeited 11.45  
Weighted average exercise price, Ending balance 9.98 $ 8.73
Weighted average exercise price, Vested and exercisable 8.39  
Weighted average exercise price, Vested and expected to vest $ 9.98  
Weighted average remaining contractual term 7 years 9 months 18 days 8 years 1 month 6 days
Weighted average remaining contractual term, Granted 6 years 10 months 24 days  
Weighted average remaining contractual term, Exercised 2 years  
Weighted average remaining contractual term, Expired/Forfeited 1 month 6 days  
Weighted average remaining contractual term, Vested and exercisable 6 years 7 months 6 days  
Weighted average remaining contractual term, Vested and expected to vest 7 years 9 months 18 days