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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments And Contingencies Tables  
Future minimum annual capital and operating lease payments

Future minimum rental commitments under operating leases for years ending December 31, are as follows (in thousands):

      Operating
Years Ended December 31,     leases
2016   $ 442 
2017     439 
2018     446 
2019     38 
2020    
Thereafter    
Total minimum lease payments   $ 1,365