Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Option Activity (Details)

v3.20.2
Stock-based Compensation - Stock Option Activity (Details) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based compensation      
Number of shares, Outstanding at beginning of period 1,839,623    
Number of shares, Granted 187,811    
Number of shares, Exercised (2,000)    
Number of shares, Forfeited, expired or cancelled (17,036)    
Number of shares, Outstanding at end of period 2,008,398   1,839,623
Number of shares, Exercisable at end of period 1,604,258    
Weighted Average Exercise Price Per Share, Outstanding at beginning of period $ 20.42    
Weighted Average Exercise Price Per Share, Granted 21.12    
Weighted Average Exercise Price Per Share, Exercised 4.77    
Weighted Average Exercise Price Per Share, Forfeited, expired or cancelled 147.00    
Weighted Average Exercise Price Per Share, Outstanding at end of period 19.43   $ 20.42
Weighted Average Exercise Price Per Share, Exercisable at end of period $ 19.70    
Weighted Average Contractual Term, Outstanding 6 years 9 months   6 years 10 months 17 days
Weighted Average Contractual Term, Exercisable 6 years 2 months 4 days    
Aggregate Intrinsic Value, Outstanding $ 16,254   $ 26,829
Aggregate Intrinsic Value, Exercisable 15,169    
Options exercised, aggregate intrinsic value $ 40 $ 200  
Weighted-average grant-date fair value (in dollars per share) $ 16.22 $ 11.37  
Unrecognized compensation expense related to stock options (in dollars) $ 4,000    
Weighted average period of unrecognized compensation expense expected to be recognized 1 year 9 months 10 days