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Supplementary Balance Sheet Information (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Other:    
Nontrade Receivables, Current $ 843 $ 176
Government of Israel [Member]    
Other:    
Nontrade Receivables, Current 659 10
Employees [Member]    
Other:    
Nontrade Receivables, Current 25 8
Sundry [Member]    
Other:    
Nontrade Receivables, Current $ 159 $ 158