Related Party Transactions - Schedule of Aggregate Changes in Balance of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transactions [Abstract]
Short term	$ 41	$ 41	$ 41
Total liability related to tax receivable agreement	$ 41	$ 41	$ 5,242

Carrying value as of the balance sheet liability related to tax receivable agreement. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

No definition available.

Name:	drct_CurrentPortionOfLiabilityRelatedToTaxReceivableAgreement
Namespace Prefix:	drct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant