INCOME TAXES (Income Taxes by Jurisdiction) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
U.S. federal
Current	$ 0	$ 0
Deferred	0	0
Total U.S. federal	0	0
U.S. state and local
Current	1	1
Deferred	0	0
Total U.S. state and local	1	1
Foreign
Current	0	0
Deferred	(15)	(23)
Total foreign	15	23
Income taxes differ from the amounts computed by applying the U.S. federal income tax rate to pretax income (loss) before income taxes
Expected income tax benefit	(7,357)	(5,191)
State income tax (benefit), net of federal benefit	(1,176)	(1,022)
Valuation allowance	7,398	6,219
Permanent differences:
Stock options	95	173
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Warrants	914	0
Transaction costs	0	31
Research & development credit	(263)	(267)
Adjustment to deferred taxes	267	(12)
Foreign rate differential	19	28
Other	89	19
Provision for (benefit from) income taxes	$ (14)	$ (22)