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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Operating loss carryforward $ 65,267 $ 57,564
Research and development 9,377 10,098
Accrued social benefits and other 863 1,456
Right of use assets (763)
Lease liabilities 840
Property and equipment 1 (11)
Deferred tax asset before valuation allowance 75,585 69,107
Valuation allowance (75,585) (69,107)
Net deferred tax asset