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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Operating loss carry forward $ 54,093 $ 48,663
Research and development 9,298 7,921
Accrued social benefits and other 874 530
Property and equipment (46) (135)
Deferred tax asset before valuation allowance 64,219 56,979
Valuation allowance (64,219) (56,979)
Net deferred tax asset