Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Restricted Stock Awards Activity (Details)

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SHARE-BASED COMPENSATION - Restricted Stock Awards Activity (Details) - Restricted Stock Awards - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Restricted Stock Awards    
Outstanding at the beginning 1,618,565 2,130,689
Granted   134,397
Forfeited/cancelled (107,271)  
Vested (692,072) (516,398)
Outstanding at the end 819,222 1,748,688
Weighted-Average Grant Date Fair Value Per Share    
Outstanding at the beginning (in dollars per share) $ 1.47 $ 1.41
Granted (in dollars per share)   2.13
Forfeited/cancelled (in dollars per share) 1.80  
Vested (in dollars per share) 1.43 1.41
Outstanding at the end (in dollars per share) $ 1.42 $ 1.41