- Schedule of Revenue Categories (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Revenue Information
Revenues (includes related party revenue of $1,247 and $163 for the three months ended March 31, 2020 and 2019, respectively)	$ 83,526	$ 85,582
Dealer revenue
Revenue Information
Revenues (includes related party revenue of $1,247 and $163 for the three months ended March 31, 2020 and 2019, respectively)	73,798	76,814
OEM incentives revenue
Revenue Information
Revenues (includes related party revenue of $1,247 and $163 for the three months ended March 31, 2020 and 2019, respectively)	3,523	4,201
Forecasts, consulting and other revenue
Revenue Information
Revenues (includes related party revenue of $1,247 and $163 for the three months ended March 31, 2020 and 2019, respectively)	$ 6,205	$ 4,567

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration