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Divestitures - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 28, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | May 21, 2021 | May 01, 2021
Divestitures [Line Items] |  |  |  |  |  |
Proceeds from sale of assets |  |  | $ 32,500,000 | $ 0 |  |
Loss on non-cancelable purchase commitment |  | $ 5,900,000 |  |  |  |
Loss on inventory |  | 6,600,000 | $ 6,600,000 | $ 0 |  |
Myriad myPath LLC laboratory |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |
Proceeds from sale of assets | $ 32,500,000 |  |  |  |  |
Net gain on sale of assets adjusted for transaction fees | $ 31,200,000 |  |  |  |  |
Held for sale |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |
Impairment on write down of assets held for sale |  | $ 0 |  |  |  |
Held for sale | Select operating assets and intellectual property of Myriad Autoimmune business unit |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 150,000,000.0
Held for sale | Myriad RBM, Inc. |  |  |  |  |  |
Divestitures [Line Items] |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 198,000,000.0 |
Aggregate adjustments for working capital, indebtedness, and transaction costs |  |  |  |  | $ (3,900,000) |

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