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INCOME TAXES - Changes in valuation allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
INCOME TAXES |  |  |
Valuation allowance, at beginning of year | $ (5,941) | $ (2,285) | $ (1,839)
Increase in valuation allowance recorded through earnings | (68,377) | (3,656) | (624)
Decrease in valuation allowance recorded through earnings | 2,033 |  | 178
Valuation allowance, at end of year | $ (72,285) | $ (5,941) | $ (2,285)

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of decrease in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | verx_ValuationAllowanceDeferredTaxAssetDecreaseInAmount
Namespace Prefix: | verx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | verx_ValuationAllowanceDeferredTaxAssetIncreaseInAmount
Namespace Prefix: | verx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration