Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Summary of Status of Company's Restricted Stock Option Activity (Details)

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Employee Benefit Plans - Summary of Status of Company's Restricted Stock Option Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Shares    
Non-vested RSUs at beginning of period (in shares) 955,011 764,201
Granted (in shares) 1,316,174 584,593
Vested (in shares) (305,027) (227,889)
Cancelled, expired or forfeited (in shares) (94,566) (165,894)
Non-vested RSUs at ending of period (in shares) 1,871,592 955,011
Weighted Average Grant Date Fair Value    
Non-vested RSUs at beginning of period (in dollars per share) $ 2.69 $ 2.54
Granted (in dollars per share) 1.21 3.04
Vested (in dollars per share) 2.77 2.64
Cancelled, expired or forfeited (in dollars per share) 2.12 2.73
Non-vested RSUs at ending of period (in dollars per share) $ 1.68 $ 2.69