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
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
Non-vested Options Outstanding  
At the beginning | shares 1,058,235
Options forfeited/cancelled | shares (13,667)
Options vested | shares (130,515)
At the end | shares 914,053
Weighted-Average Grant Date Fair Value  
At the beginning (in dollars per share) | $ / shares $ 0.95
Options forfeited/cancelled (in dollars per share) | $ / shares 2.58
Options vested (in dollars per share) | $ / shares 0.95
At the end (in dollars per share) | $ / shares $ 0.92