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Related party transactions (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 28, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related party transactions        
Rent   $ 90,887 $ 503,995 $ 422,882
Consulting and professional fees   $ 1,929 $ 9,103 $ 56,986
BDP Realty Corporation        
Related party transactions        
Ownership interest owned by related party (as a percent)   33.33%    
Rent expenses period 2 months