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Commitments and Contingencies - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2018 | Jun. 30, 2020 | Apr. 30, 2020
Indenix |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages awarded |  | $ 2,540,000,000 |  |  |
Past damages vacated |  |  | $ 2,540,000,000 |  |
Juno |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages awarded | $ 585,000,000 |  |  |  |
Running royalty rate on future sales | 27.60% |  |  |  | 27.60%
Enhancement rate on past damages |  |  |  |  | 50.00%
Estimate of possible loss representing past sales |  |  |  | $ 811,000,000 |
Estimate of possible loss representing enhancement of past damages |  |  |  | 389,000,000 |
Estimate of possible loss representing royalties and prejudgment interest |  |  |  | 88,000,000 |
Juno | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss |  |  |  | 0 |
Juno | Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss |  |  |  | $ 1,300,000,000 |

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