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Acquisitions - Additional Information (Details) £ in Thousands, $ in Thousands			12 Months Ended
	Jan. 08, 2019 USD ($)	Jan. 08, 2019 GBP (£)	Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Payments to acquire business			$ 19,139
PistonHeads Holdco Limited | United Kingdom | Put and Call Option Agreement
Business Acquisition [Line Items]
Payments to acquire business	$ 19,139	£ 15,000
Acquisition-related costs incurred			$ 779
Business acquisition completed date	Jan. 08, 2019	Jan. 08, 2019
PistonHeads Holdco Limited | United Kingdom | Escrow Agreement
Business Acquisition [Line Items]
Payments to acquire business	$ 1,276	£ 1,000

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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