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Stock-Based Compensation - Stock opption plan activity (Details) - shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Stock option plan activity    
Outstanding, Number, Beginning Balance (in shares) 633,277  
Granted (in shares) 420,000 960,204
Exercised (in shares) (84,589)  
Forfeited/Cancelled (in shares) (48,333)  
Outstanding, Number, Ending Balance (in shares) 920,355 960,204