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Organization and Summary of Significant Accounting Policies - Revenue by Type (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]            
Total revenue $ 299.8 $ 381.4 $ 690.6 $ 557.1 $ 638.6 $ 851.1
Molecular diagnostic revenues            
Disaggregation of Revenue [Line Items]            
Total revenue 279.6 353.1 666.4 513.5 586.9 789.4
Molecular diagnostic - Hereditary Cancer            
Disaggregation of Revenue [Line Items]            
Total revenue 159.3   316.3   347.4 479.7
Molecular diagnostic - Tumor Profiling            
Disaggregation of Revenue [Line Items]            
Total revenue 33.9   120.9   48.3 43.0
Molecular diagnostic - Prenatal            
Disaggregation of Revenue [Line Items]            
Total revenue 37.6   106.8   76.7 104.9
Molecular diagnostic - Pharmacogenomics            
Disaggregation of Revenue [Line Items]            
Total revenue 29.8   93.7   74.1 112.6
Molecular diagnostic - Autoimmune            
Disaggregation of Revenue [Line Items]            
Total revenue 18.0   28.2   39.1 48.3
Molecular diagnostic - Other            
Disaggregation of Revenue [Line Items]            
Total revenue 1.0   0.5   1.3 0.9
Pharmaceutical and clinical services            
Disaggregation of Revenue [Line Items]            
Total revenue $ 20.2 $ 28.3 $ 24.2 $ 43.6 $ 51.7 $ 61.7