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Summary of significant accounting policies (Details) - USD ($)
$ in Thousands
9 Months Ended
Aug. 04, 2015
Sep. 30, 2015
Aug. 03, 2015
Principles of consolidation      
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest   $ 1,150  
Concourse Communications Detroit, LLC      
Principles of consolidation      
Percentage of additional ownership in Subsidiary acquired 30.00%    
Total purchase price $ 1,150    
Reduction to additional paid-in capital resulting from purchase of remaining noncontrolling interest $ 1,150    
Chicago Concourse Development Group, LLC      
Principles of consolidation      
Percentage of ownership in subsidiaries   70.00%  
Boingo Holding Participacoes Ltda.      
Principles of consolidation      
Percentage of ownership in subsidiaries   75.00%  
Concourse Communications Detroit, LLC      
Principles of consolidation      
Percentage of ownership in subsidiaries     70.00%