Noncontrolling Interests - Summary Ownership of Viant Technology LLC (Details) - Viant Technology LLC - shares |
6 Months Ended | 9 Months Ended | |
|---|---|---|---|
Jun. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Minority Interest [Line Items] | |||
| Units Owned (shares) | 66,454,762 | 63,310,414 | |
| Units Owned, Noncontrolling Interest (shares) | 45,402,216 | 45,717,216 | |
| Ownership percentage by non-controlling interests | 68.30% | 72.20% | |
| Ownership Percentage | 100.00% | 100.00% | |
| Viant Technology Inc. | |||
| Minority Interest [Line Items] | |||
| Units Owned (shares) | 21,052,546 | 17,593,198 | |
| Ownership percentage by Viant Technology Inc. | 31.70% | 27.80% |