Consolidated Statements of Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
REVENUES	$ 653,000	$ 302,000
OPERATING EXPENSES
Research and development	10,045,000	6,895,000
General and administrative	9,644,000	8,697,000
TOTAL OPERATING EXPENSES	19,689,000	15,592,000
OPERATING LOSS	(19,036,000)	(15,290,000)
OTHER INCOME (EXPENSE)
Investment income	67,000	22,000
Warrant inducement expense	(2,688,000)	0
Other expense	(10,000)	(1,000)
TOTAL OTHER INCOME (EXPENSE)	(2,631,000)	21,000
LOSS BEFORE INCOME TAXES	(21,667,000)	(15,269,000)
Benefit from income taxes	14,000	22,000
NET LOSS	(21,653,000)	(15,247,000)
Foreign currency translation adjustment, net of tax	44,000	(51,000)
COMPREHENSIVE LOSS	$ (21,609,000)	$ (15,298,000)
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share)	$ (1.44)	$ (1.57)
Weighted average shares outstanding — basic and diluted (shares)	15,015,446	9,691,115