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Summary of significant accounting policies (Details Textual)
12 Months Ended
Dec. 31, 2014
Furniture and Fixtures [Member] | Minimum [Member]  
Subsidiary or Equity Method Investee [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Furniture and Fixtures [Member] | Maximum [Member]  
Subsidiary or Equity Method Investee [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Leasehold Improvements [Member] | Minimum [Member]  
Subsidiary or Equity Method Investee [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Leasehold Improvements [Member] | Maximum [Member]  
Subsidiary or Equity Method Investee [Line Items]  
Property, Plant and Equipment, Useful Life 15 years
Computer Software, Intangible Asset [Member]  
Subsidiary or Equity Method Investee [Line Items]  
Property, Plant and Equipment, Useful Life 5 years