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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2017
Related Party Transactions [Abstract]
Related party transactions	Related Party Transactions Transactions with USAA USAA is the Company's largest stockholder and 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 June 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 June 30, 2017 and December 31, 2016 of $4.7 million and $3.9 million, respectively. The Company recorded sales and marketing expense of $4.5 million and $3.4 million for the three months ended June 30, 2017 and 2016, respectively, related to service arrangements entered into with USAA. The Company recorded sales and marketing expenses of $8.5 million and $6.7 million for the six months ended June 30, 2017 and 2016, respectively.