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NATURE OF OPERATIONS AND LIQUIDITY - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) License	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Nature Of Operations And Liquidity [Line Items]
Accumulated deficit	$ 298,887,383		$ 286,736,218
Net cash used in operating activities	9,202,397	$ 9,600,592
Cash, cash equivalents, restricted cash and marketable securities	$ 37,600,000
Development-stage Proprietary Compounds
Nature Of Operations And Liquidity [Line Items]
Number of licenses acquired | License	4

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