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Noncontrolling Interests - Summary of Effect of Changes in Ownership Interest in Viant Technology LLC on Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Noncontrolling Interest [Abstract]
Net income attributable to Viant Technology Inc.	$ 996	$ 1,507	$ 96	$ 615
Transfers to noncontrolling interests:
Decrease in the additional-paid-in-capital of Viant Technology Inc. resulting from ownership changes in Viant Technology LLC	(2,808)	(3,974)	(11,318)	(7,554)
Change from net income attributable to Viant Technology Inc. and transfers to noncontrolling interests	$ (1,812)	$ (2,467)	$ (11,222)	$ (6,939)

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