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ORGANIZATION AND DESCRIPTION OF BUSINESS (Details) - USD ($)
$ in Thousands
 9 Months Ended 34 Months Ended
Jun. 24, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 23, 2024
Dec. 31, 2024
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]          
Cash funding received from Illumina   $ 0 $ 1,244,300    
Cash and cash equivalents   126,892 $ 853,551   $ 214,234
Short-term marketable securities   $ 413,238     $ 549,236
Illumina, Inc.          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]          
Cash funding received from Illumina $ 932,300        
Illumina, Inc.          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]          
Percent of shares distributed in spin-off (as a percent) 85.50%        
Stockholders' equity note, spinoff transaction, number of shares distributed (in shares) 31,000,000.0        
SDG Ops, LLC | Illumina, Inc.          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]          
Percentage ownership prior to spin-off (as a percent)       100.00%  
Grail, Inc. | Illumina, Inc.          
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]          
Shares owned (in shares) 4,502,126        
Percentage of shares retained after spin-off (as a percent) 14.50% 12.50%