ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES
Accrued pre-clinical and clinical expenses	$ 4,836	$ 4,287
Accrued professional fees	898	345
Accrued compensation and benefits	273
Accrued patent expenses	42	54
Other	447	264
Total accrued expenses & other current liabilities	$ 6,496	$ 4,950