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Acquisitions - Summary of Preliminary Purchase Price Allocation (Parenthetical) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Jan. 08, 2019
PistonHeads Holdco Limited
Business Acquisition [Line Items]
Intangible assets	[1]		$ 4,466
Brand
Business Acquisition [Line Items]
Estimated useful lives		11 years
Brand | PistonHeads Holdco Limited
Business Acquisition [Line Items]
Intangible assets			3,445
Estimated useful lives		11 years
Customer Relationships
Business Acquisition [Line Items]
Estimated useful lives		3 years
Customer Relationships | PistonHeads Holdco Limited
Business Acquisition [Line Items]
Intangible assets			$ 1,021
Estimated useful lives		3 years
[1] Identifiable definite-lived intangible assets were comprised of brand and customer relationships of $3,445 and $1,021, respectively, with estimated useful lives of 11 years and 3 years, respectively, which will be amortized on a straight-line basis over their estimated useful lives.

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The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464

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-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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