Vehicle Floorplan Facility - Additional Information (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 01, 2023	Nov. 07, 2022	Mar. 31, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Line Of Credit Facility [Line Items]
Restricted cash				$ 94,305		$ 94,305		$ 82,450
2020 Vehicle Floorplan Facility
Line Of Credit Facility [Line Items]
Outstanding borrowings				345,300		345,300		$ 512,800
Interest expense				$ 6,500	$ 5,000	$ 19,800	$ 12,400
Weighted average interest rate				6.55%		6.55%		4.30%
Debt instrument, covenant compliance						As of September 30, 2022 and December 31, 2021, the Company was in compliance with all covenants related to the 2020 Vehicle Floorplan Facility.
2020 Vehicle Floorplan Facility | Cash Deposits
Line Of Credit Facility [Line Items]
Restricted cash				$ 34,500		$ 34,500		$ 50,600
Vehicle Floorplan Facility | Credit Balance Agreements
Line Of Credit Facility [Line Items]
Interest credits earned				3,900	$ 2,900	$ 11,400	$ 7,100
Ally Bank and Ally Financial | Line Of Credit | 2020 Vehicle Floorplan Facility
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 700,000
Line of credit facility, description						The amount of credit available is determined on a monthly basis based on a calculation that considers average outstanding borrowings and vehicle units paid off by the Company within the immediately preceding three-month period. As of September 30, 2022, the borrowing capacity of the 2020 Vehicle Floorplan Facility was $350.6 million, of which $5.3 million was unutilized. The 2022 Vehicle Floorplan Facility, as described below, will allow for more flexibility in the Company's borrowing capacity.
Line of credit facility, current borrowing capacity				350,000		$ 350,000
Line of credit facility, unutilized borrowing capacity				$ 5,300		$ 5,300
Debt instrument, covenant description						The 2020 Vehicle Floorplan Facility is collateralized by the Company’s vehicle inventory and certain other assets and the Company is subject to covenants that require it to maintain a certain level of equity in the vehicles that are financed, to maintain at least 7.5% of the credit line in cash and cash equivalents, and to maintain 10% of the daily floorplan principal balance outstanding on deposit with Ally Bank.
Debt instrument covenant to maintain minimum percentage of credit line in cash and cash equivalents						7.50%
Maturity Date			Mar. 31, 2023
Availability fee payable each quarter on average unused capacity from prior quarter floorplan allowance percentage						50.00%
Debt instrument covenant to maintain principal balance outstanding						10.00%
Ally Bank and Ally Financial | Line Of Credit | 2020 Vehicle Floorplan Facility | Prime Rate
Line Of Credit Facility [Line Items]
Basis points						1.05%
Ally Bank and Ally Financial | Line Of Credit | 2022 Vehicle Floorplan Facility
Line Of Credit Facility [Line Items]
Line of credit facility, description						The amendment also provides that the Company may elect to increase its monthly credit line availability by an additional $25.0 million during any four months in the period from November 1, 2022 through March 31, 2024, subject to the maximum $500.0 million credit limit. Consistent with the terms of the 2020 Vehicle Floorplan Facility, the Company and Vroom Automotive, LLC have provided Ally with a guaranty of payment of all amounts owed under the 2022 Vehicle Floorplan Facility as well as a security interest in all or substantially all tangible, intangible, and other personal property of Vroom, Inc., to secure obligations under the 2022 Vehicle Floorplan Facility.
Debt instrument, covenant description						The 2022 Vehicle Floorplan Facility bears interest at a rate equal to the Prime Rate, announced per annum by Ally Bank, plus 175 basis points. Additionally, the Company is subject to amended covenants and events of default. The Company is required to maintain a certain level of equity in the vehicles that are financed, to maintain at least 20.0% of the credit line in cash and cash equivalents, and to maintain a minimum required balance with Ally of at least 12.5% of the daily floorplan principal balance outstanding through December 31, 2022 and 15.0% effective January 1, 2023. The Company was required to pay a commitment fee upon execution of the 2022 Vehicle Floorplan Facility.
Ally Bank and Ally Financial | Line Of Credit | 2022 Vehicle Floorplan Facility | Scenario Forecast
Line Of Credit Facility [Line Items]
Debt instrument covenant to maintain principal balance outstanding	15.00%
Ally Bank and Ally Financial | Line Of Credit | 2022 Vehicle Floorplan Facility | Subsequent Events
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 500,000
Debt instrument covenant to maintain minimum percentage of credit line in cash and cash equivalents		20.00%
Maturity Date		Mar. 31, 2024
Additional availability line of credit facility any four months during the maturity period		$ 25,000
Debt instrument covenant to maintain principal balance outstanding		12.50%
Ally Bank and Ally Financial | Line Of Credit | 2022 Vehicle Floorplan Facility | Subsequent Events | Prime Rate
Line Of Credit Facility [Line Items]
Basis points		175.00%