Related Party Transactions (Details) (USD $)				3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	60 Months Ended		60 Months Ended				3 Months Ended	9 Months Ended	3 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2013 Dealertrack	Sep. 30, 2013 Dealertrack Cost of revenue	Sep. 30, 2014 Dealertrack Cost of revenue	Sep. 30, 2013 Dealertrack Cost of revenue	Sep. 30, 2013 Dealertrack Sales and marketing	Sep. 30, 2013 Dealertrack Sales and marketing	Dec. 31, 2011 Executives	Sep. 30, 2014 Executives	Dec. 31, 2011 Executives Minimum	Dec. 31, 2011 Executives Maximum	Sep. 30, 2014 Marketing Firm with Related Officer	Dec. 31, 2013 Marketing Firm with Related Officer	Sep. 30, 2014 Marketing Firm with Related Officer Sales and marketing	Sep. 30, 2014 Marketing Firm with Related Officer Sales and marketing	Sep. 30, 2014 Employee	Jun. 30, 2014 Employee	Sep. 30, 2014 USAA	Dec. 31, 2013 USAA	Sep. 30, 2014 USAA Sales and marketing	Sep. 30, 2013 USAA Sales and marketing	Sep. 30, 2014 USAA Sales and marketing	Sep. 30, 2013 USAA Sales and marketing
Related Party Transactions
Costs under related party agreements				$ 500,000	$ 400,000	$ 1,700,000	$ 100,000	$ 300,000							$ 1,000,000	$ 2,600,000					$ 5,700,000	$ 2,200,000	$ 11,900,000	$ 5,400,000
Payable to related party																			400,000	1,200,000
Amounts due to related party			0										0	300,000
Notes issued to related parties									4,100,000
Cash exchanged for notes receivable									2,900,000
Common stock exchanged for notes receivable									1,200,000
Interest rate on notes receivable											1.20%	6.00%					3.50%
Notes receivable from related party	380,000	178,000								300,000
Amount advanced to employee																		60,000
Employee advance outstanding																	60,000
Receivable from related party	769,000	431,000																	800,000	400,000
Prepaid expenses (includes related party prepaid expenses of $1,376 at September 30, 2014)	$ 6,239,000	$ 3,550,000											$ 1,400,000	$ 0