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Organization and Description of Business (Details) - Direct Digital Holdings, LLC	1 Months Ended	9 Months Ended
	Feb. 28, 2022	Sep. 30, 2025
Schedule of Organization and Description of Business [Line Items]
Percentage of voting interests	100.00%
Percentage of economic voting interests	19.70%	63.50%
Percentage of ownership interest		100.00%

X

- Definition

Percentage of economic voting units.

+ References

No definition available.

+ Details

Name:	drct_PercentageOfEconomicVotingUnits
Namespace Prefix:	drct_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The parent entity's voting interest in subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	drct_PercentageOfVotingInterest
Namespace Prefix:	drct_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	drct_ScheduleOfOrganizationAndDescriptionOfBusinessLineItems
Namespace Prefix:	drct_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482987/272-10-50-3

+ Details

Name:	us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_OwnershipAxis=drct_DirectDigitalHoldingsLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: