Acquisitions (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Autoweb [Member]
Consideration transferred	$ 27,826
Autoweb [Member] | Series B Preferred Stock [Member]
Consideration transferred	20,989
Autoweb [Member] | Series B Preferred Warrants [Member]
Consideration transferred	2,542
Autoweb [Member] | Cash [Member]
Consideration transferred	279
Autoweb [Member] | Fair Value Of Prior Ownership [Member]
Consideration transferred	4,016
Auto USA [Member]
Consideration transferred	11,854
Auto USA [Member] | Cash [Member]
Consideration transferred	10,044
Auto USA [Member] | Convertible Notes Payable [Member]
Consideration transferred	1,300
Auto USA [Member] | Warrant [Member]
Consideration transferred	$ 510