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Commitments and Contingencies - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2016 | Jun. 30, 2018 | Apr. 08, 2020 | Mar. 31, 2020 | Dec. 13, 2019
Indenix [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | $ 2,540,000,000 |  |  |  |
Motion Invalidated Past Damages, Amount |  |  | $ 2,540,000,000 |  |  |
Juno [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 585,000,000 |  |  |  |  |
Judgment: Royalty Rate on Future Sales |  |  |  |  |  | 27.60%
Loss Contingency, Estimate of Possible Loss (Past Sales) |  |  |  |  | $ 811,000,000 |
Loss Contingency, Estimate of Possible Loss (50% Enhancement of Past Damages) |  |  |  |  | 389,000,000 |
Loss Contingency, Estimate of Possible Loss (Royalties and Prejudgment Interest) |  |  |  |  | 45,000,000 |
Minimum [Member] | Juno [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  | 0 |
Maximum [Member] | Juno [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  |  |  | $ 1,200,000,000 |
Subsequent Event | Juno [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Judgment: Royalty Rate on Future Sales |  |  |  | 27.60% |  |
Judgment: Enhanced Damages on Past Sales |  |  |  | 50.00% |  |

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