Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Restricted Stock Awards    
Outstanding at the beginning 1,618,565 2,130,689
Granted   134,397
Forfeited/cancelled (107,271)  
Vested (802,679) (646,521)
Outstanding at the end 708,615 1,618,565
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 1.44
Outstanding at the end (in dollars per share) $ 1.42 $ 1.47