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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Transactions with Stockholders In October 2011, as part of the acquisition of ALG, the Company entered into various data licensing and transition services agreements with Dealertrack, a former significant stockholder of the Company. In the first quarter of 2014, Dealertrack divested its holdings in the Company and was no longer a related party. Costs under these agreements included in cost of revenue were $0.4 million for the year ended December 31, 2014. Service Provider From October 2013 to October 2015, an executive officer of the Company was an officer of a firm that provided marketing services to the Company. For the years ended December 31, 2015 and 2014, the Company recorded sales and marketing expense of $6.8 million and $4.2 million, respectively, for expenses paid to this marketing firm. Transactions with USAA USAA is the largest stockholder and most significant affinity marketing partner of the Company. The Company has entered into arrangements with USAA to operate its Auto Buying Program. The Company has amounts due from USAA at December 31, 2016 and 2015 of $0.4 million and $0.3 million, respectively. In addition, the Company has amounts due to USAA at December 31, 2016 and 2015 of $3.9 million and $7.8 million, respectively. At December 31, 2016 and 2015 $2.9 million and $7.5 million was included in accounts payable, respectively, while $1.0 million and $0.3 million was included in accrued expenses and other current liabilities, respectively. The Company recorded sales and marketing expense of $13.9 million, $14.0 million, and $15.2 million for the years ended December 31, 2016, 2015 and 2014, respectively, related to service arrangements entered into with USAA, including non-cash expense associated with warrants to purchase shares of common stock (Note 7).