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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
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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration