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Stock-Based Compensation - Non-Vested Common Stock Grants (Details) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award      
Document Period End Date Mar. 31, 2021    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Granted shares 79,214 1,175  
Less: Forfeited shares 26,723    
Less: Vested shares 9,418    
Outstanding shares 302,079   259,006
Granted (fair value) $ 5.97 $ 8.75  
Less: Forfeited (fair value) 10.47    
Less: Vested (fair value) 17.57    
Outstanding (fair value) $ 8.72   $ 10.06