Goodwill and Intangible Assets - Summary of Fair Value of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 12, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net	$ 7,232	$ 8,869
Goodwill	9,353	9,353
Car360
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, acquired cost	9,939	9,939	$ 9,900
Less: accumulated amortization	(2,707)	(1,070)
Intangible assets, net	7,232	8,869
Goodwill	9,353	9,353
Car360 | Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, acquired cost	$ 8,642	8,642
Useful Life	7 years
Car360 | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, acquired cost	$ 523	523
Useful Life	2 years
Car360 | Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, acquired cost	$ 774	$ 774
Useful Life	5 years