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Credit Agreement (Details) - USD ($)
Sep. 30, 2015
Jul. 31, 2015
Dec. 31, 2014
Credit agreement      
Borrowings outstanding $ 0   $ 0
Revolving line of credit      
Credit agreement      
Maximum borrowing capacity   $ 10,000,000.0  
Wayfair, Inc. | July 31, 2015 through September 30, 2015 | Line of credit      
Credit agreement      
Maximum borrowing capacity   35,000,000.0  
Wayfair, Inc. | October 1, 2015 through February 28, 2016 | Line of credit      
Credit agreement      
Maximum borrowing capacity   45,000,000  
Wayfair, Inc. | March 1, 2016 through July 31, 2016 | Line of credit      
Credit agreement      
Maximum borrowing capacity   $ 35,000,000