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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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