Consolidated Statements Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	Total	Previously Reported	Revision of Prior Period, Adjustment	Common Stock	Common Stock Previously Reported	Common Stock Revision of Prior Period, Adjustment	Additional Paid-in Capital	Additional Paid-in Capital Previously Reported	Additional Paid-in Capital Revision of Prior Period, Adjustment	Accumulated Deficit	Accumulated Deficit Previously Reported	Accumulated Deficit Revision of Prior Period, Adjustment	Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income Previously Reported	Accumulated Other Comprehensive (Loss) Income Revision of Prior Period, Adjustment
Beginning balance (in shares) at Dec. 31, 2018		1,220,851	(1,220,851)
Beginning balance at Dec. 31, 2018		$ 8,670	$ (8,670)
Ending balance (in shares) at Dec. 31, 2019		0
Ending balance at Dec. 31, 2019		$ 0
Beginning balance (in shares) at Dec. 31, 2018				50,325,203	37,881,435	12,443,768
Beginning balance at Dec. 31, 2018	$ 393	(8,277)	$ 8,670	$ 5	$ 4	$ 1	$ 15,195	$ 6,526	$ 8,669	$ (14,807)	$ (14,807)	$ 0	$ 0	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (12,678)									(12,678)
Redeemable convertible preferred stock issuance, shown as if recapitalized (in shares)	8,295,840
Redeemable convertible preferred stock issuance, shown as if recapitalized	$ 8,890			$ 1			8,889
Other comprehensive income, net of tax	0
Accrued dividends on redeemable convertible preferred stock	(1,579)						(1,579)
Stock-based compensation	113						113
Ending balance (in shares) at Dec. 31, 2019					58,621,042
Ending balance at Dec. 31, 2019		$ (4,861)			$ 6			22,618			(27,485)			0
Ending balance (in shares) at Dec. 31, 2020		0
Ending balance at Dec. 31, 2020		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(6,552)									(6,552)
Other comprehensive income, net of tax	15												15
Accrued dividends on redeemable convertible preferred stock	(1,884)						(1,884)
Stock-based compensation	$ 45						45
Ending balance (in shares) at Dec. 31, 2020	58,621,042				58,621,042
Ending balance at Dec. 31, 2020	$ (13,237)	$ (13,237)			$ 6			$ 20,779			$ (34,037)			$ 15
Ending balance (in shares) at Dec. 31, 2021	0
Ending balance at Dec. 31, 2021	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(39,879)									(39,879)
Other comprehensive income, net of tax	(108)												(108)
Accrued dividends on redeemable convertible preferred stock	(20)						(20)
PIPE issuance (in shares)				12,500,000
PIPE issuance	125,000			$ 1			124,999
Merger financing (in shares)				38,194,390
Merger financing	309,999			$ 4			309,995
Consideration to existing shareholders of Former CarLotz, net of accrued dividends	(62,693)						(62,693)
Transaction costs and advisory fees	(47,579)						(47,579)
Settlement of redeemable convertible preferred stock tranche obligation	2,832						2,832
Cashless exercise of options (in shares)				54,717
Cash consideration paid to Former CarLotz optionholders	(2,465)						(2,465)
Stock-based compensation	51,121						51,121
Earnout liability	(74,284)						(74,284)
Merger warrants liability	(39,024)						(39,024)
KAR/AFC warrant exercise (in shares)				3,546,984
KAR/AFC note payable conversion	3,625						3,625
KAR/AFC warrant exercise (in shares)				752,927
KAR/AFC warrant exercise	144						144
Issuance of Class A common stock to settle vested restricted stock units (in shares)				71,523
Net issuance of Class A common stock to settle vested restricted stock units	$ (84)						(84)
Exercise of stock options (in shares)	310,877			254,818
Exercise of stock options	$ 163						163
Ending balance (in shares) at Dec. 31, 2021	58,621,042			113,996,401
Ending balance at Dec. 31, 2021	$ 213,511			$ 11			$ 287,509			$ (73,916)			$ (93)