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NATURE OF OPERATIONS AND LIQUIDITY - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) License | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Nature Of Operations And Liquidity [Line Items] |  |  |
Accumulated deficit | $ 230,379,928 |  | $ 214,552,728
Net cash used in operating activities | 9,600,592 | $ 10,931,732 |
Cash, cash equivalents, restricted cash and marketable securities | $ 79,300,000 |  |
Development-stage Proprietary Compounds |  |  |
Nature Of Operations And Liquidity [Line Items] |  |  |
Number of licenses acquired | License | 4 |  |

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