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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment, Net
 
December 31
 
   
2017
   
2018
 
   
US$ thousands
 
             
Machinery and equipment
   
10,531
     
12,150
 
Office furniture and equipment
   
665
     
725
 
Leasehold improvements
   
2,309
     
2,375
 
                 
Property, plant and equipment
   
13,505
     
15,250
 
                 
Accumulated depreciation
   
(9,384
)
   
(11,580
)
                 
Property, Plant and equipment, net
   
4,121
     
3,670