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Summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Estimated Useful Lives of Property and Equipment

The estimated useful lives of property and equipment are as follows:

 

Computer and network equipment

      5-7 years   

Furniture, fixtures and office equipment

      3-5 years   

Leasehold improvements

      4-7 years