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INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Operating loss carryforward $ 86,068 $ 80,134
Research and development 9,773 9,001
Accrued social benefits and other 2,801 2,389
Right of use assets (520) (651)
Lease liabilities 636 742
Property and equipment 2 2
Deferred tax asset before valuation allowance 98,760 91,617
Valuation allowance (98,760) (91,617)
Net deferred tax asset