Selected Balance Sheet Accounts (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill
Goodwill, beginning of period	$ 42,903	$ 20,948
Acquisition of Dealix/Autotegrity		11,215
Acquisition of AutoWeb		10,740
Purchase price allocation adjustments from Dealix/Autotegrity acquisition	(82)
Goodwill, end of period	$ 42,821	$ 42,903