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RELATED PARTY TRANSACTIONS - Schedule of related party disclosures by income statement grouping (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Related Party Transaction [Line Items]        
Screening revenue $ 36,194 $ 28,652 $ 103,575 $ 87,343
Operating expenses—Research and development [1] 48,647 78,231 148,898 274,052
Operating expenses—General and administrative [2] 37,408 47,418 120,396 171,745
Screening revenue        
Related Party Transaction [Line Items]        
Screening revenue [3] 32,807 25,374 96,319 77,076
Cost of revenue [4] 15,910 15,970 52,379 45,481
Related Party        
Related Party Transaction [Line Items]        
Operating expenses—Research and development 973 6,588 2,947 16,700
Operating expenses—General and administrative 0 1 0 104
Related Party | Screening revenue        
Related Party Transaction [Line Items]        
Screening revenue 50 129 179 366
Cost of revenue 1,237 3,658 3,924 9,784
Related Party | Illumina, Inc.        
Related Party Transaction [Line Items]        
Operating expenses—Research and development 973 6,588 2,947 16,700
Operating expenses—General and administrative 0 1 0 104
Related Party | Cost of screening revenue | Illumina, Inc.        
Related Party Transaction [Line Items]        
Cost of revenue 1,237 3,658 3,924 9,784
Related Party | Cost of development services revenue | Illumina, Inc.        
Related Party Transaction [Line Items]        
Cost of revenue $ 78 $ 143 $ 260 $ 259
[1] Includes related party research and development expenses of $973 and $2,947 for the three and nine months ended September 30, 2025 and $6,588 and $16,700 for the three and nine months ended September 30, 2024, respectively.
[2] Includes related party general and administrative expenses of nil for the three and nine months ended September 30, 2025 and $1 and $104 for the three and nine months ended September 30, 2024, respectively.
[3] ncludes related party screening revenue of $50 and $179 for the three and nine months ended September 30, 2025 and $129 and $366 for the three and nine months ended September 30, 2024, respectively.
[4] ncludes related party cost of screening revenue of $1,237 and $3,924 for the three and nine months ended September 30, 2025 and $3,658 and $9,784 for the three and nine months ended September 30, 2024, respectively.