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Other Receivables (Tables)
12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of Other Receivables
   
December 31
 
   
2018
   
2019
 
   
US$ thousands
 
             
Advances to suppliers
   
5,260
     
805
 
Government authorities
   
2,916
     
2,758
 
Prepaid expense
   
884
     
553
 
Other receivables
   
427
     
848
 
     
9,487
     
4,964