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STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
A summary of restricted stock unit activity for the six months ended June 30, 2021 is as follows (each restricted stock unit issued by the Company represents the right to receive one share of the Company’s common stock):

A summary of restricted stock unit activity for the six months ended June 30, 2021 is as follows (each restricted stock unit issued by the Company represents the right to receive one share of the Company’s common stock):

   Number of Shares   Weighted-Average Grant Date Fair Value 
Balance of restricted stock units outstanding at December 31, 2020   162,500   $2.25 
Grants of restricted stock units   45,000    3.51 
Vested restricted stock units   (22,500)   (3.51)
Balance of unvested restricted stock units at June 30, 2021   185,000   $2.41