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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment, Net
   
December 31
 
     
2018
     
2019
 
   
US$ thousands
 
                 
Machinery and equipment
   
12,150
     
13,374
 
Office furniture and equipment
   
725
     
924
 
Leasehold improvements
   
2,375
     
2,528
 
                 
Property, plant and equipment
   
15,250
     
16,826
 
                 
Accumulated depreciation
   
(11,580
)
   
(13,252
)
                 
Property, Plant and equipment, net
   
3,670
     
3,574