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Stock-Based Compensation - Summary of Non-vested Restricted Stock Activity (Details) - Restricted stock awards
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Number of SAR's Outstanding and Exercisable  
Non-vested shares, Beginning balance (in shares) | shares 373,860
Granted (in shares) | shares 441,109
Vested (in shares) | shares (193,624)
Forfeited (in shares) | shares (54,299)
Non-vested shares, Ending balance (in shares) | shares 567,046
Units  
Non-vested shares, Weighted-Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares $ 7.25
Granted, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares 5.53
Vested in period, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares 7.44
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share) | $ / shares 5.80
Non-vested shares, Weighted-Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 5.99