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Cash and Cash Equivalents (Currencies) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 30,833 $ 18,220 $ 16,495 $ 18,867
U.S. Dollars [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 26,703 9,576    
New Israeli Shekels [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 2,002 2,569    
Euro [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 770 2,033    
Chinese RMB [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 640 1,541    
Japanese YEN [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 142 1,825    
Other Currencies [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 576 $ 676