NET LOSS PER COMMON SHARE - Anti-dilutive securities (Details) - shares	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Options to purchase common stock
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	5,069,437	4,491,670
Restricted stock units
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	576,569	204,279
Warrants to purchase common stock
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	38,375,618	125,618