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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment, Net
   
December 31
 
   
2015
   
2016
 
   
US$ thousands
 
             
Machinery and equipment
   
6,906
     
8,507
 
Office furniture and equipment
   
608
     
634
 
Leasehold improvements
   
2,205
     
2,277
 
                 
Property, plant and equipment
   
9,719
     
11,418
 
                 
Accumulated depreciation
   
(5,894
)
   
(7,503
)
                 
Property, Plant and equipment, net
   
3,825
     
3,915