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Share-Based Compensation - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Outstanding at beginning of period (in shares) 726,143   829,376  
Exercised (in shares) (868)   (99,261)  
Forfeited (in shares)     (4,840)  
Outstanding at end of year (in shares) 725,275 726,143 725,275 829,376
Exercisable (in shares) 505,098   505,098  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]        
Weighted-Average Exercise Price Per Share, Outstanding at beginning of period (in dollars per share) $ 10.84   $ 10.32  
Weighted-Average Exercise Price Per Share, Exercised (in dollars per share) 3.38   6.41  
Weighted Average Exercise Price Per Share, Forfeited (in dollars per share)     10.33  
Weighted-Average Exercise Price Per Share, Outstanding at ending of period (in dollars per share) 10.85 $ 10.84 10.85 $ 10.32
Weighted-Average Exercise Price Per Share, Exercisable (in dollars per share) $ 9.79   $ 9.79  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]        
Weighted-Average Contractual Term, 5 years 3 months 18 days 5 years 7 months 6 days 5 years 3 months 18 days 5 years 9 months 18 days
Weighted-Average Contractual Term, Exercised 3 years 9 months 18 days   3 years 2 months 12 days  
Weighted-Average Contractual Term, Forfeited     5 years 7 months 6 days  
Weighted-Average Contractual Term, Exercisable 4 years 9 months 18 days   4 years 9 months 18 days  
Aggregate Intrinsic Value, Balance $ 0 $ 0 $ 0 $ 5,776
Aggregate Intrinsic Value, Exercisable $ 0   $ 0