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TAXES ON INCOME - DEFERRED TAXES COMPONENTS AND OTHER TAX SCHEDULES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Taxes on income    
Net operating loss carryforwards $ 102,808  
Deferred tax assets:    
Net operating loss carryforwards 23,103 $ 13,295
Research and development credits 4,374 4,885
Accrued social benefits and other 36 29
Issuance costs 450 430
Deferred tax assets before valuation allowance 27,963 18,639
Valuation allowance (27,963) (18,639)
Loss (income) before taxes on income:    
Loss (income) before taxes on income 23,199 25,497
Reconciliation of the beginning and ending balances of unrecognized tax benefits:    
Unrecognized tax benefits, beginning of year 258 258
Increase in unrecognized tax benefits for current year 120  
Unrecognized tax benefits, end of year 378 258
Domestic    
Loss (income) before taxes on income:    
Loss (income) before taxes on income 23,630 25,815
Foreign    
Loss (income) before taxes on income:    
Loss (income) before taxes on income $ (431) $ (318)