CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 51,200	$ 50,411	$ 93,829	$ 90,555
Operating expenses:
Platform operations	30,950	31,715	57,144	56,059
Sales and marketing	17,286	20,553	31,042	34,738
Technology and development	5,011	8,031	10,014	13,931
General and administrative	11,725	14,075	22,808	24,495
Total operating expenses	64,972	74,374	121,008	129,223
Loss from operations	(13,772)	(23,963)	(27,179)	(38,668)
Interest expense, net	21	241	173	476
Other expense (income), net	299	1	303	(68)
Gain on extinguishment of debt		(6,110)		(6,110)
Total other expense (income), net	320	(5,868)	476	(5,702)
Net loss	(14,092)	(18,095)	(27,655)	(32,966)
Less: Net loss attributable to noncontrolling interests	(10,691)	(14,440)	(21,062)	(26,206)
Net loss attributable to Viant Technology Inc.	$ (3,401)	$ (3,655)	$ (6,593)	$ (6,760)
Loss per share of Class A common stock:
Basic	$ (0.24)	$ (0.32)	$ (0.47)	$ (0.59)
Diluted	$ (0.24)	$ (0.32)	$ (0.47)	$ (0.59)
Weighted-average shares of Class A common stock outstanding:
Basic	14,114	11,500	13,962	11,500
Diluted	14,114	11,500	13,962	11,500