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STOCK-BASED COMPENSATION - 2024 inducement award plan (Details)	May 14, 2025 shares
The GRAIL, Inc. 2024 Inducement Award Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)	500,000

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Aggregate number of common shares reserved for future issuance.

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