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Stock-based Compensation - Summary of RSAs Activity (Details) | 12 Months Ended
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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)

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- 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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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- 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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |