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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Commitments And Contingencies Disclosure [Abstract] |  |
Repurchase liability | $ 140 | $ 139

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Repurchase liability. + References No definition available. + Details
Name: | vel_RepurchaseLiability
Namespace Prefix: | vel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant