Consolidated Statements of Comprehensive Loss - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
REVENUES	$ 524,000	$ 653,000
OPERATING EXPENSES
Research and development	14,271,000	10,045,000
Sales, marketing and administration	11,546,000	9,644,000
TOTAL OPERATING EXPENSES	25,817,000	19,689,000
NET OPERATING LOSS	(25,293,000)	(19,036,000)
OTHER INCOME (EXPENSE)
Interest and investment income	481,000	67,000
Warrant inducement expense	0	(2,688,000)
Other expense	(3,000)	(10,000)
TOTAL OTHER INCOME (EXPENSE)	478,000	(2,631,000)
LOSS BEFORE INCOME TAXES	(24,815,000)	(21,667,000)
Provision for (benefit from) income taxes	(1,000)	14,000
NET LOSS	(24,816,000)	(21,653,000)
Foreign currency translation adjustment, net of tax	(8,000)	44,000
COMPREHENSIVE LOSS	$ (24,824,000)	$ (21,609,000)
NET LOSS PER SHARE - BASIC AND DILUTED (in dollars per share)	$ (0.98)	$ (1.44)
Weighted average shares outstanding — basic and diluted (shares)	25,290,426	15,015,446