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Stock-Based Compensation - Non-Vested Common Stock Grants (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award          
Document Period End Date     Jun. 30, 2021    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Granted shares 208,812 346,078 288,026 347,254  
Less: Forfeited shares     82,381    
Less: Vested shares     80,072    
Outstanding shares 384,579   384,579   259,006
Granted (fair value) $ 6.07 $ 9.57 $ 6.04 $ 9.57  
Less: Forfeited (fair value)     9.76    
Less: Vested (fair value)     10.00    
Outstanding (fair value) $ 7.13   $ 7.13   $ 10.06