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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2015
Summary of Significant Accounting Policies [Abstract]  
Summary of property and equipment useful life

 

 Internal-use software3 years 
 Equipment3 to 5 years 
 Computer equipment3 to 7 years 
 Furniture and fixtures5 to 7 years 
 Leasehold improvementsShorter of life of asset or lease