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TAXES ON INCOME - Significant components of the Group's deferred tax liabilities and assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Net operating loss carryforward $ 31,391 $ 30,330
Reserves and allowances 12,588 5,613
Net deferred tax assets before valuation allowance 43,979 35,943
Less - valuation allowance (23,513) (31,593)
Deferred tax asset 20,466 4,350
Deferred tax liability (139) (305)
Domestic Tax Authority [Member]    
Deferred tax assets:    
Deferred tax asset 13,863 3,342
Foreign Tax Authority [Member]    
Deferred tax assets:    
Deferred tax asset 6,603 1,008
Deferred tax liability $ (139) $ (305)