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Nature of Operations	9 Months Ended
	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	Nature of Operations Viant Technology Inc. (the “Company,” “we,” “us,” “our” or “Viant”) was incorporated in the State of Delaware on October 9, 2020. The Company operates a cloud-based demand side platform (“DSP”) that is used by marketers and their advertising agencies to centralize the planning, buying and measurement of their advertising across most channels, including connected TV ("CTV"), streaming audio, digital out-of-home, mobile and desktop. Our headquarters are located in Irvine, California with other leased office spaces across the United States.

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- Definition

The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 275
-Publisher FASB
-URI https://asc.fasb.org/275/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-SubTopic 10
-Topic 275
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-1

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- References

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