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Related Party Transactions	6 Months Ended
Related Party Transactions	Jun. 30, 2018
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. At the time that the Company entered into these arrangements, USAA met the definition of a related party. The Company had amounts due from USAA at June 30, 2018 and December 31, 2017 of $0.1 million and $0.2 million, respectively. In addition, the Company had amounts due to USAA at June 30, 2018 and December 31, 2017 of $4.6 million and $3.3 million, respectively. The Company recorded sales and marketing expense of $5.3 million and $4.5 million for the three months ended June 30, 2018 and 2017, respectively, related to service arrangements entered into with USAA. The Company recorded sales and marketing expense of $9.8 million and $8.5 million for the six months ended June 30, 2018 and 2017, respectively, related to service arrangements entered into with USAA.