ORGANIZATION AND NATURE OF OPERATIONS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net loss	$ (4,103)	$ (4,580)
Net cash used in operating activities	(6,610)	$ (5,316)
Cash and cash equivalents	7,127		$ 7,232
Research and development expense and periodic common stock sales	4,000
Accumulated deficit	$ (89,083)		$ (84,980)