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STOCK OPTIONS - Summary of Nonvested Stock Options (Details) - $ / shares
 12 Months Ended
Jan. 29, 2020
Dec. 31, 2020
Dec. 31, 2019
Number of options      
Number of Options Non-vested at beginning of period (in shares)   1,484,929  
Number of Options Non-vested, Granted (in shares) 700,000 1,376,900 1,379,500
Number of Options Non-vested, Vested (in shares)   (665,510)  
Number of Options Non-vested, Forfeited (in shares)   (151,850)  
Number of Options Non-vested at end of period (in shares)   2,044,469 1,484,929
Weighted average grant date fair value      
Weighted average grant date fair value, Non-vested Options at beginning of period (in dollars per share)   $ 4.11  
Weighted average grant date fair value, Non-vested Options, Granted (in dollars per share)   4.78 $ 4.57
Weighted average grant date fair value, Non-vested Options, Vested (in dollars per share)   3.77  
Weighted average grant date fair value, Non-vested Options, Forfeited (in dollars per share)   4.53  
Weighted average grant date fair value, Non-vested Options at end of period (in dollars per share)   $ 4.61 $ 4.11