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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment, Net
   
December 31
 
   
2016
   
2017
 
   
US$ thousands
 
             
Machinery and equipment
   
8,507
     
10,531
 
Office furniture and equipment
   
634
     
665
 
Leasehold improvements
   
2,277
     
2,309
 
                 
Property, plant and equipment
   
11,418
     
13,505
 
                 
Accumulated depreciation
   
(7,503
)
   
(9,384
)
                 
Property, Plant and equipment, net
   
3,915
     
4,121