Annual report pursuant to Section 13 and 15(d)

EMPLOYEE STOCK OPTIONS, RESTRICTED STOCK AWARD PLAN AND 401(k) - Status of Restricted Stock Grants (Details)

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EMPLOYEE STOCK OPTIONS, RESTRICTED STOCK AWARD PLAN AND 401(k) - Status of Restricted Stock Grants (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock, Outstanding at beginning of the year 1,341,889 878,360 330,900
Restricted stock, Granted 1,980,000 657,605 619,880
Restricted stock, Forfeited or rescinded (9,200) (6,940) (7,800)
number of restricted stock vested 1,180,392 187,136 64,620
Restricted stock, Outstanding at end of year 2,132,297 1,341,889 878,360
Weighted-Average Grant Date Fair Value, Outstanding at beginning of the year $ 4.99 $ 7.33 $ 13.44
Weighted-Average Grant Date Fair Value, Granted 0.71 2.63 4.78
Weighted-Average Grant Date Fair Value, Forfeited or rescinded 3.97 4.23 13.44
Weighted-Average Grant Date Fair Value, Vested 4.97 7.79 13.44
Weighted-Average Grant Date Fair Value, Outstanding at end of year $ 2.94 $ 4.99 $ 7.33