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STOCK-BASED COMPENSATION - Restricted Stock unit Activity (Details) - Unvested restricted stock units
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Shares  
Unvested at beginning of period (in shares) | shares 143,000
Granted (in shares) | shares 47,435
Vested (in shares) | shares (189,435)
Forfeited (in shares) | shares (1,000)
Unvested at End of period (in shares) | shares 0
Weighted Average Grant Date Fair Value  
Unvested at beginning of period (in usd per share) | $ / shares $ 1.38
Granted (in usd per share) | $ / shares 0.78
Vested (in usd per share) | $ / shares 1.23
Forfeited (in usd per share) | $ / shares 1.38
Unvested at end of period (in usd per share) | $ / shares $ 0