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Related Party Transactions - Schedule of Related Party Transactions Related to Related Party Receivables and Payables (Details) - USD ($) $ in Thousands | Jun. 30, 2026 | Dec. 31, 2025
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Related Party Transactions [Abstract] |  |
Related party receivable | $ 1,359 | $ 4,019
Related party payables | $ 5,051 | $ 5,671

X
- Definition Related party current payables. + References No definition available. + Details
Name: | ttgt_RelatedPartyCurrentPayables
Namespace Prefix: | ttgt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Related party current receivable. + References No definition available. + Details
Name: | ttgt_RelatedPartyCurrentReceivable
Namespace Prefix: | ttgt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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