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Related Party Transactions	9 Months Ended
Related Party Transactions	Sep. 30, 2017
Related Party Transactions [Abstract]
Related party transactions	Related Party Transactions 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 September 30, 2017 and December 31, 2016 of $0.2 million and $0.4 million, respectively. In addition, the Company has amounts due to USAA at September 30, 2017 and December 31, 2016 of $4.4 million and $3.9 million, respectively. The Company recorded sales and marketing expense of $4.2 million and $3.7 million for the three months ended September 30, 2017 and 2016, respectively, related to service arrangements entered into with USAA. The Company recorded sales and marketing expenses of $12.8 million and $10.4 million for the nine months ended September 30, 2017 and 2016, respectively, related to such service arrangements.