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Stock-Based Compensation - Summary of Restricted Stock Activity (Details) - Restricted Stock [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Restricted shares, Non-vested Beginning Balance 772,150 791,725
Number of Restricted shares, Granted 522,110 484,500
Number of Restricted shares, Vested (774,015) (470,175)
Number of Restricted shares, Forfeited (5,370) (33,900)
Number of Restricted shares, Non-vested Ending Balance 514,875 772,150
Weighted average grant date fair value, Non-vested Beginning Balance $ 3.40 $ 4.37
Weighted average grant date fair value, Granted 2.91 2.27
Weighted average grant date fair value, Vested (3.35) (3.83)
Weighted average grant date fair value, Forfeited (3.46) (4.04)
Weighted average grant date fair value, Non-vested Ending Balance $ 2.97 $ 3.40