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Stock-Based Compensation - Non-Vested Common Stock Grants (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award          
Document Period End Date     Sep. 30, 2021    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Granted shares 2,551 37,318 290,577 384,572  
Less: Forfeited shares     119,946    
Less: Vested shares     92,910    
Outstanding shares 336,727   336,727   259,006
Granted (fair value) $ 3.76 $ 7.31 $ 6.02 $ 9.35  
Less: Forfeited (fair value)     8.92    
Less: Vested (fair value)     9.99    
Outstanding (fair value) $ 7.01   $ 7.01   $ 10.06