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Noncontrolling Interests - Summary Ownership of Viant Technology LLC (Details) - Viant Technology LLC - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Minority Interest [Line Items]
Units Owned (shares)	63,074,291	62,816,201
Ownership Percentage	100.00%	100.00%
Viant Technology Inc.
Minority Interest [Line Items]
Units Owned (shares)	16,224,237	15,783,941
Ownership percentage by Viant Technology Inc.	25.70%	25.10%
Noncontrolling Interests
Minority Interest [Line Items]
Units Owned (shares)	46,850,054	47,032,260
Ownership percentage by non-controlling interests	74.30%	74.90%

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