NET LOSS PER COMMON SHARE - Anti-dilutive securities (Details) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Preferred 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		7,538,671
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	4,238,892	2,552,921
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	198,113	482,364