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Subsequent Event (Details) - Anti-PD-1 - TESARO - Amendment - USD ($) |  |  | 9 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Oct. 23, 2020 | Sep. 30, 2020
Subsequent Event [Line Items] |  |  |
Milestones achieved, amount |  |  | $ 1,100,000,000
Subsequent event |  |  |
Subsequent Event [Line Items] |  |  |
Percent of net sales below $1 billion |  | 8.00% |
Revenue Recognition, Multiple-deliverable Arrangements, Upfront Fee Receivable |  | $ 60,000,000.0 |
Subsequent event | Forecast |  |  |
Subsequent Event [Line Items] |  |  |
Royalty percent on net sales | 1.00% |  |
Subsequent event | Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Percent of net sales above $1 billion |  | 12.00% |
Subsequent event | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Percent of net sales above $1 billion |  | 25.00% |

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