Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
REVENUES	$ 220	$ 63	$ 376	$ 90
OPERATING EXPENSES
Research and development	2,245	1,327	4,355	2,519
General and administrative	2,058	1,570	4,844	3,339
Depreciation and amortization	194	156	382	301
TOTAL OPERATING EXPENSES	4,497	3,053	9,581	6,159
NET OPERATING LOSS	(4,277)	(2,990)	(9,205)	(6,069)
OTHER INCOME, NET
Interest and investment income	16	2	25	6
Other expense	(1)	0	(1)	0
TOTAL OTHER INCOME, NET	15	2	24	6
LOSS BEFORE INCOME TAXES	(4,262)	(2,988)	(9,181)	(6,063)
Provision for (benefit from) income taxes	(1)	0	24	(1)
NET LOSS	(4,263)	(2,988)	(9,157)	(6,064)
Foreign currency translation adjustment, net of tax	45	0	63	0
COMPREHENSIVE LOSS	$ (4,218)	$ (2,988)	$ (9,094)	$ (6,064)
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share)	$ (0.29)	$ (0.34)	$ (0.66)	$ (0.75)
Weighted average shares outstanding-basic and diluted (in shares)	14,535,451	8,870,245	13,967,476	8,103,908