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Stockholders' Equity - Restricted Stock Outstanding Rollforward (Details) - Restricted stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Outstanding at December 31, unvested (in shares) 498  
Granted (in shares) 317 322
Vested (in shares) (252)  
Forfeited (in shares) (7)  
Outstanding at December 31, unvested (in shares) 556 498
Weighted- average grant date fair value    
Outstanding at December 31, unvested (in dollars per share) $ 9.51  
Granted (in dollars per share) 8.19 $ 9.67
Vested (in dollars per share) 9.18  
Forfeited (in dollars per share) 10.00  
Outstanding at December 31, unvested (in dollars per share) $ 8.90 $ 9.51