Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
REVENUES	$ 3,160	$ 735
OPERATING EXPENSES
Research and development	19,477	18,854
Sales, marketing and administration	12,150	12,040
TOTAL OPERATING EXPENSES	31,627	30,894
NET OPERATING LOSS	(28,467)	(30,159)
OTHER INCOME (EXPENSE)
Interest and investment income	66	253
Interest and other expense	(12)	(21)
TOTAL OTHER INCOME	54	232
LOSS BEFORE INCOME TAXES	(28,413)	(29,927)
Provision for income taxes	(1)	(1)
NET LOSS	(28,414)	(29,928)
Foreign currency translation adjustment, net of tax	86	16
COMPREHENSIVE LOSS	$ (28,328)	$ (29,912)
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share)	$ (0.55)	$ (1.02)
Weighted average shares outstanding — basic and diluted (shares)	51,254,329	29,409,776