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Equity Awards and Instruments - Additional Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Aug. 28, 2020
Dec. 31, 2014
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options exercise price reduction (USD per share) $ 1.50          
Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proceeds from stock options exercised         $ 3,612 $ 2,179
Unrecognized compensation cost     $ 7,825   $ 11,911  
Cost not yet recognized, period for recognition     1 year 10 months 24 days   2 years 7 months 6 days  
Stock options exercised, intrinsic value     $ 58,502 $ 21,555 $ 22,914 $ 18,291
Expected dividend yield   0.00% 1.11%   1.38% 1.18%
Value of shares repurchased by Company after exercised by employee     $ 1,454 $ 4,952    
Stock Option | 2020 Incentive Award Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Proceeds from stock options exercised     7,776   $ 3,612  
Restricted Stock and Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost, excluding options     $ 16,915      
Cost not yet recognized, period for recognition     3 years 8 months 12 days