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Related-Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
Related Party Transaction [Line Items]          
MinimumOwnershipThreshold       5.00%  
SIgnificant Stockholder / Reseller          
Related Party Transaction [Line Items]          
Revenue from related parties $ 0.8 $ 2.2 $ 2.0    
Gross accounts receivable         $ 0.4