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Stock-based Compensation - Summary of RSAs Activity (Details)	12 Months Ended
	Dec. 31, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Unvested and outstanding, Beginning balance	408,000
Shares, Unvested and outstanding, Ending balance	2,235,442
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Unvested and outstanding, Beginning balance	272,868
Vested	(272,868)

X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Share based compensation arrangement by share based payment award equity instruments other than options subject to vested in period.

+ References

No definition available.

+ Details

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Namespace Prefix:	vrm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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X

- Details

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