Acquisition - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended						9 Months Ended
	Feb. 01, 2022	Jan. 07, 2021	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Net income (loss)			$ (51,127)	$ (115,089)	$ (310,459)	$ (98,122)	$ (65,807)	$ (77,189)	$ (476,675)	$ (241,118)
Acquisition-related cost									5,700
Non-recurring tax adjustment (benefit)									24,100	32,500
Vast Holdings, Inc. (“d/b/a CarStory”)
Business Acquisition [Line Items]
Business acquisition, date of acquisition		Jan. 07, 2021
Percentage of business acquisition rate		100.00%
Fair value of consideration transferred		$ 116,568
UACC
Business Acquisition [Line Items]
Business acquisition, date of acquisition	Feb. 01, 2022
Revenues			47,700						133,700
Net income (loss)			17,700						37,900
Transaction costs			$ 5,700			$ 3,400			$ 5,700	$ 3,400
Percentage of business acquisition rate	100.00%
Fair value of consideration transferred	$ 315,400