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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Minimum Lease Payments Under Non-cancelable Operating Leases

The minimum lease payments under the non-cancelable operating leases are payable in the following amounts over the following years.

 

     2017      2018      2019      2020      2021      Total  

Operating lease obligations (1)

    $ 559      $ 569      $ 377      $ 350      $ 292      $ 2,147  
  

 

 

     

 

 

     

 

 

     

 

 

     

 

 

     

 

 

  
   $ 559      $ 569      $ 377      $ 350      $ 292      $ 2,147  
  

 

 

     

 

 

     

 

 

     

 

 

     

 

 

     

 

 

  

 

1. The dollar amounts shown in these columns reflect the U.S. dollar equivalent of the Canadian operating lease obligations, discussed above. The amounts were converted to U.S. dollars from CAD dollars using the December 31, 2016 daily noon exchange rate of US$0.7448.