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INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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INVESTMENTS |  |
Accrued interest receivable | $ 40 | $ 20

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

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- Definition Amount of accrued interest receivable on debt securities available for sale. + References No definition available. + Details
Name: | verx_DebtSecuritiesAvailableForSaleAccruedInterest
Namespace Prefix: | verx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant