v3.25.4
SUBSEQUENT EVENTS (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2026
Dec. 31, 2025
Dec. 31, 2024
Subsequent Event [Line Items]      
Shares granted (in shares)   2,152,456  
Intangible assets, net   $ 1,850,556 $ 2,016,890
Minimum | The GRAIL, Inc. 2024 Incentive Award Plan      
Subsequent Event [Line Items]      
Vesting term (in years)   18 months  
Maximum | The GRAIL, Inc. 2024 Incentive Award Plan      
Subsequent Event [Line Items]      
Vesting term (in years)   48 months  
Subsequent Event | The GRAIL, Inc. 2024 Incentive Award Plan      
Subsequent Event [Line Items]      
Share-based compensation arrangement by share-based payment award, number of shares authorized 12,368,055    
Subsequent Event | Restricted Stock Units (RSUs) | Common Class A      
Subsequent Event [Line Items]      
Shares granted (in shares) 1,700,000    
Grant date fair value $ 88,500    
Subsequent Event | Restricted Stock Units (RSUs) | Common Class A | Maximum      
Subsequent Event [Line Items]      
Vesting term (in years) 4 years    
Subsequent Event | Employee Stock | Common Class A | The GRAIL, Inc. 2024 Employee Stock Purchase Plan      
Subsequent Event [Line Items]      
Share-based compensation arrangement by share-based payment award, number of shares authorized 1,156,269