Stock-based Compensation - Summary of Stock-based Compensation Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 26,457	$ 22,540	$ 54,299	$ 37,933
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	646	635	1,290	1,252
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	12,786	13,944	26,289	27,687
CarOffer Incentive Units and Subject Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total	$ 13,025	$ 7,961	$ 26,720	$ 8,994