Stock-Based Compensation - Schedule of Weighted Average Assumptions (Details) - Unvested performance stock units |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Performance period (in years) | 3 years | 3 years |
| Risk-free interest rate | 3.52% | 4.26% |
| Expected volatility of Magnite | 66.00% | 78.00% |
| Expected volatility of selected peer companies | 54.00% | 56.00% |
| Expected correlation coefficients of Magnite | 48.00% | 57.00% |
| Expected correlation coefficients of selected peer companies | 45.00% | 47.00% |
| Dividend yield | 0.00% | 0.00% |
| X | ||||||||||
- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficients No definition available.
|
| X | ||||||||||
- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Selected Peer Companies, Correlation Coefficients No definition available.
|
| X | ||||||||||
- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Selected Peer Companies, Weighted Average Volatility Rate No definition available.
|
| X | ||||||||||
- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Rate of weighted-average expected volatility for award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|