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Commitments and Contingencies - Additional Information (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2018 Patent | Dec. 31, 2016 USD ($) | Mar. 31, 2016 USD ($) | May 31, 2018 Patent | Sep. 30, 2016 USD ($) | Sep. 30, 2018 USD ($) | Feb. 28, 2018 Pending_Claim | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages awarded |  | $ 2,540 |  |  |  |  |  |
Motion invalidated past damages, amount |  | $ 2,540 |  |  |  |  |  |
Damages awarded but dismissed |  |  | $ 200 |  |  |  |  |
Litigation accrual |  |  |  |  |  | $ 0 |  | $ 0
Number of pending claims with motions to dismiss | Pending_Claim |  |  |  |  |  |  | 2 |
Merck '499 and '712 patents |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages awarded but dismissed, value |  |  |  |  | $ 200 |  |  |
Aurobindo Pharma USA Inc V.S. Gilead Sciences, Inc |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of patents allegedly infringed | Patent |  |  |  | 2 |  |  |  |
Strides Pharma, Inc V.S. Gilead Sciences, Inc - Emtricitabine Patent |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of patents allegedly infringed | Patent | 2 |  |  |  |  |  |  |
Strides Pharma, Inc V.S. Gilead Sciences, Inc - Emtricitabine And Tenofovir Patent |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of patents allegedly infringed | Patent |  |  |  | 4 |  |  |  |

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