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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Minimum Future Rental Payments
The minimum future rental payments under the above leases at exchange rates in effect on December 31, 2017, are as follows:
 
Year ended December 31
 
US$ thousands
 
2018
   
1,665
 
2019
   
1,211
 
2020 and on
   
226