Condensed 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 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, 2020	0	2,034,751	(2,034,751)
Beginning balance at Dec. 31, 2020	$ 0	$ 17,560	$ (17,560)
Ending balance (in shares) at Mar. 31, 2021	0
Ending balance at Mar. 31, 2021	$ 0
Beginning balance (in shares) at Dec. 31, 2020				58,621,042	37,881,435	20,739,607
Beginning balance at Dec. 31, 2020	(13,237)	$ (30,797)	$ 17,560	$ 6	$ 4	$ 2	$ 20,779	$ 3,221	$ 17,558	$ (34,037)	$ (34,037)	$ 15	$ 15	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(15,022)									(15,022)
Other comprehensive income, net of tax	(131)											(131)
Accrued dividends on redeemable convertible preferred stock	(19)						(19)
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	41,963						41,963
Earnout liability	(74,284)						(74,284)
Merger warrants liability	(39,025)						(39,025)
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
Ending balance (in shares) at Mar. 31, 2021				113,670,060
Ending balance at Mar. 31, 2021	$ 229,108			$ 11			278,272			(49,059)		(116)
Beginning balance (in shares) at Dec. 31, 2021		0
Beginning balance at Dec. 31, 2021		$ 0
Ending balance (in shares) at Mar. 31, 2022	0
Ending balance at Mar. 31, 2022	$ 0
Beginning balance (in shares) at Dec. 31, 2021	113,996,401				113,996,401
Beginning balance at Dec. 31, 2021	$ 213,511	$ 213,511			$ 11			$ 287,509			$ (73,916)		$ (93)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(24,836)									(24,836)
Other comprehensive income, net of tax	(73)											(73)
Issuance of common stock to settle vested restricted stock units (in shares)				70,971
Issuance of common stock to settle vested restricted stock units	$ (2)						(2)
Cashless exercise of options (in shares)	50,964			44,424
Stock-based compensation	$ 1,684						1,684
Ending balance (in shares) at Mar. 31, 2022	113,996,401			114,111,796
Ending balance at Mar. 31, 2022	$ 190,284			$ 11			$ 289,191			$ (98,752)		$ (166)