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Acquisitions - Summary of Preliminary Purchase Price Allocation (Parenthetical) (Details) - USD ($) $ in Thousands | 9 Months Ended |
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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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