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NET LOSS PER COMMON SHARE - Anti-dilutive securities (Details) - shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Options    
Antidilutive securities excluded from computation of loss per share    
Potential dilutive securities excluded from the computation of diluted net loss per share attributable to common stockholders 4,851,565 4,491,670
Restricted Stock Units (RSUs)    
Antidilutive securities excluded from computation of loss per share    
Potential dilutive securities excluded from the computation of diluted net loss per share attributable to common stockholders 551,468 204,279
Warrants Liability    
Antidilutive securities excluded from computation of loss per share    
Potential dilutive securities excluded from the computation of diluted net loss per share attributable to common stockholders 125,618 125,618