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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 |  |

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