Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Non-vested Stock Options (Details)

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SHARE-BASED COMPENSATION - Non-vested Stock Options (Details) - Stock Options - $ / shares
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Non-vested Options Outstanding    
At the beginning 427,035  
Options granted 1,016,722 468,070
Options forfeited/cancelled (64,042)  
Options exercised (22,524)  
Options vested (291,356) (33,294)
At the end 1,065,835 434,776
Weighted-Average Grant Date Fair Value    
At the beginning (in dollars per share) $ 1.21  
Options granted (in dollars per share) 0.99 $ 1.22
Options forfeited/cancelled (in dollars per share) 1.88  
Options exercised (in dollars per share) 1.41  
Options vested (in dollars per share) 0.97 1.41
At the end (in dollars per share) $ 0.93 $ 1.21