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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2014
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:

            Operating
            leases
2015         $ 430,000 
2016           442,000 
2017           439,000 
2018           446,000 
2019           38,000 
Thereafter          
Total minimum lease payments         $ 1,795,000