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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Revenue by Type (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Total revenue $ 753.2 $ 678.4 $ 690.6
Testing Revenue      
Disaggregation of Revenue [Line Items]      
Total revenue 753.2 678.4 666.4
Hereditary Cancer      
Disaggregation of Revenue [Line Items]      
Total revenue 327.8 305.5 316.3
Tumor Profiling      
Disaggregation of Revenue [Line Items]      
Total revenue 135.6 128.6 120.9
Prenatal      
Disaggregation of Revenue [Line Items]      
Total revenue 151.3 116.4 106.8
Pharmacogenomics      
Disaggregation of Revenue [Line Items]      
Total revenue 138.5 127.6 93.7
Autoimmune      
Disaggregation of Revenue [Line Items]      
Total revenue 0.0 0.3 28.2
Other      
Disaggregation of Revenue [Line Items]      
Total revenue 0.0 0.0 0.5
Other revenue      
Disaggregation of Revenue [Line Items]      
Total revenue $ 0.0 $ 0.0 $ 24.2