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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2020
Jun. 30, 2019
Sep. 13, 2021
Goodwill And Intangible Assets [Line Items]          
Goodwill impairment charge $ 0 $ 0   $ 0  
Impairment of long-lived assets $ 0 $ 0 $ 17,700,000 $ 0  
Weighted average remaining amortization period   10 years      
Disposed of by sale | Myriad RBM, Inc. and Myriad Autoimmune business          
Goodwill And Intangible Assets [Line Items]          
Net decrease in intangible assets due to sale         $ 120,000,000
Accumulated amortization on intangible assets included in sale         (91,600,000)
Purchased licenses and technologies | Disposed of by sale | Myriad RBM, Inc. and Myriad Autoimmune business          
Goodwill And Intangible Assets [Line Items]          
Intangible assets included in sale         199,100,000
Purchased licenses and technologies | Minimum          
Goodwill And Intangible Assets [Line Items]          
Estimated remaining useful life 1 year        
Purchased licenses and technologies | Maximum          
Goodwill And Intangible Assets [Line Items]          
Estimated remaining useful life 14 years        
Customer relationships | Disposed of by sale | Myriad RBM, Inc. and Myriad Autoimmune business          
Goodwill And Intangible Assets [Line Items]          
Intangible assets included in sale         4,700,000
Trademarks | Disposed of by sale | Myriad RBM, Inc. and Myriad Autoimmune business          
Goodwill And Intangible Assets [Line Items]          
Intangible assets included in sale         3,000,000
In-process research and development | Disposed of by sale | Myriad RBM, Inc. and Myriad Autoimmune business          
Goodwill And Intangible Assets [Line Items]          
Intangible assets included in sale         $ 4,800,000
Myriad Autoimmune reporting unit          
Goodwill And Intangible Assets [Line Items]          
Goodwill impairment charge     80,700,000    
Clinic reporting unit          
Goodwill And Intangible Assets [Line Items]          
Goodwill impairment charge     $ 1,300,000