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Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions 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 year ended December 31, 2015, the Company recorded sales and marketing expense of $6.8 million for expenses paid to this marketing firm. Transactions with USAA USAA is a large stockholder in the Company and the Company's most significant affinity marketing partner. The Company has entered into arrangements with USAA to operate its Auto Buying Program. The Company has amounts due from USAA at December 31, 2017 and 2016 of $0.2 million and $0.4 million, respectively. In addition, the Company has amounts due to USAA at December 31, 2017 and 2016 of $3.3 million and $3.9 million, respectively. At December 31, 2017 and 2016, $3.2 million and $2.9 million was included in accounts payable, respectively, while $0.1 million and $1.0 million was included in accrued expenses and other current liabilities, respectively. The Company recorded sales and marketing expense of $16.5 million, $13.9 million, and $14.0 million for the years ended December 31, 2017, 2016 and 2015, respectively, related to service arrangements entered into with USAA, including non-cash expense associated with warrants to purchase shares of common stock (Note 7).