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Related Party Transactions
9 Months Ended
Sep. 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 September 30, 2018 and December 31, 2017 of $0.4 million and $0.2 million, respectively. In addition, the Company had amounts due to USAA at September 30, 2018 and December 31, 2017 of $5.9 million and $3.3 million, respectively. The Company recorded sales and marketing expense of $6.5 million and $4.2 million for the three months ended September 30, 2018 and 2017, respectively, related to service arrangements entered into with USAA. The Company recorded sales and marketing expense of $16.3 million and $12.8 million for the nine months ended September 30, 2018 and 2017, respectively, related to service arrangements entered into with USAA.