Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
REVENUES	$ 604	$ 63	$ 1,148	$ 197
OPERATING EXPENSES
Research and development	4,845	4,633	10,307	9,019
Sales, marketing and administration	2,976	2,994	6,115	5,979
TOTAL OPERATING EXPENSES	7,821	7,627	16,422	14,998
NET OPERATING LOSS	(7,217)	(7,564)	(15,274)	(14,801)
OTHER INCOME (EXPENSE)
Interest and investment income	7	72	64	178
Other expense	(5)	(6)	(9)	(11)
TOTAL OTHER INCOME, NET	2	66	55	167
LOSS BEFORE INCOME TAXES	(7,215)	(7,498)	(15,219)	(14,634)
Provision for income taxes	0	0	1	1
NET LOSS	(7,215)	(7,498)	(15,220)	(14,635)
Foreign currency translation adjustment, net of tax	8	16	17	6
COMPREHENSIVE LOSS	$ (7,207)	$ (7,482)	$ (15,203)	$ (14,629)
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share)	$ (0.14)	$ (0.27)	$ (0.31)	$ (0.53)
Weighted average shares outstanding-basic and diluted (in shares)	52,901,488	28,150,497	48,367,308	27,850,879