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STOCK-BASED COMPENSATION - 2024 ESPP (Details) - Employee stock purchase plan - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Unrecognized share based compensation costs related to ESPP |  | $ 0.6 |  | $ 0.6 |
Period for recognition of share-based compensation |  |  |  | 1 month 6 days |
The GRAIL, Inc. 2024 Employee Stock Purchase Plan |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Additional shares authorized (in shares) | 338,934 |  |  |  |
Number of shares authorized (in shares) | 752,955 |  |  |  |
Shares available for grant (in shares) |  | 752,955 |  | 752,955 |
Maximum earnings withheld for purchase of shares (as a percent) |  |  |  | 15.00% |
Purchase price as a percentage of fair value (as a percent) |  |  |  | 85.00% |
Shares granted (in shares) |  | 0 | 0 | 0 | 0
Expected dividend rate (as a percent) |  |  |  | 0.00% |

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