Income Taxes - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 07, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Effective tax rate		(0.20%)	(0.04%)	(0.12%)
Valuation allowance		$ 216,017,000	$ 121,859,000
Uncertain tax positions		0	$ 0
Interest accrued in relation to uncertain tax positions		0
Penalties accrued in relation to uncertain tax positions		0
Vast Holdings, Inc. (“d/b/a CarStory”)
Income Taxes [Line Items]
Business acquisition, date of acquisition	Jan. 07, 2021
Domestic Tax Authority
Income Taxes [Line Items]
Net operating loss carryforwards for tax purposes		$ 893,400,000
Operating loss carryforwards earliest expiration year		2028
Operating loss carryforwards latest expiration year		2042
Net operating loss carryforwards expiring in indefinite period for tax purposes		$ 728,200,000
Domestic Tax Authority | Tax Period Expire from 2028 through 2042
Income Taxes [Line Items]
Net operating loss carryforwards for tax purposes		$ 165,200,000
State and Local Jurisdiction
Income Taxes [Line Items]
Operating loss carryforwards earliest expiration year		2034
Operating loss carryforwards latest expiration year		2040
State and Local Jurisdiction | Tax Period Expire from 2034 through 2040
Income Taxes [Line Items]
Net operating loss carryforwards for tax purposes		$ 237,800,000