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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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