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INCOME TAXES (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:        
Carry forward tax losses $ 41,941 $ 35,051    
Research and development carry forward expenses-temporary differences 946 1,294    
Accrual and reserves 341 290    
Lease liabilities 390 433    
Total deferred tax asset 43,618 37,068    
Deferred tax liabilities:        
Right-of-use liability (390) (433)    
Net deferred tax assets 43,228 36,635    
Valuation allowance (42,941) (36,392) $ (29,655) $ (26,311)
Net deferred tax assets $ 287 $ 243