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Financial Income (Expenses), Net (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Financial Income (Expenses), Net
 
Year ended December 31
  
   
2015
    
2016
    
2017
  
   
US$ thousands
  
                   
Interest income
    
1,026
      
751
      
527
  
Discount on marketable securities, net
    
(561
)
    
(358
)
    
(217
)
Exchange rate differences, net
    
(148
)
    
(236
)
    
(45
)
Bank charges
    
(97
)
    
(122
)
    
(109
)
                         
     
220
      
35
      
156