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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment, Net
 
December 31
 
   
2014
   
2015
 
   
US$ thousands
 
             
Machinery and equipment
    5,338       6,906  
Office furniture and equipment
    433       608  
Leasehold improvements
    1,023       2,205  
                 
Property, plant and equipment
    6,794       9,719  
                 
Accumulated depreciation
    (4,336 )     (5,894 )
                 
Property, Plant and equipment, net
    2,458       3,825