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Stock-Based Compensation - Non-Vested Common Stock Grants (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
$ / shares
shares
Sep. 30, 2019
$ / shares
shares
Sep. 30, 2020
shares
$ / shares
Sep. 30, 2019
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award          
Document Period End Date     Sep. 30, 2020    
Contingent Restricted Shares     45,000    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award          
Granted shares 37,318 843 384,572 133,421  
Less: Forfeited shares     232,323    
Less: Vested shares     109,267    
Outstanding shares 257,477   257,477   214,495
Granted (fair value) | $ / shares $ 7.31 $ 12.82 $ 9.35 $ 16.26  
Less: Forfeited (fair value) | $ / shares     12.61    
Less: Vested (fair value) | $ / shares     16.63    
Outstanding (fair value) | $ / shares $ 10.10   $ 10.10   $ 17.49