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Selected Statement of Operations Data (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property and equipment - by geographical location    
Property and equipment, net $ 202 $ 498
Israel [Member]    
Property and equipment - by geographical location    
Property and equipment, net 85 119
Romania [Member]    
Property and equipment - by geographical location    
Property and equipment, net 116 378
United States [Member]    
Property and equipment - by geographical location    
Property and equipment, net $ 1 $ 1