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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments And Contingencies Tables  
Estimated remaining minimum annual lease commitment
Fiscal year ending December 31      
2016   $ 533,826  
2017     533,826  
2018     533,826  
2019     533,826  
2020     536,792  
      2,672,096  
Thereafter, 2021 through 2025     2,592,018  
      5,264,114