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Subsequent Event - Additional Information (Detail) - Kite Pharma, Inc. ("Kite") [Member] - Collaboration and License Agreement [Member] - Subsequent Event [Member]	1 Months Ended
	Feb. 28, 2018 USD ($)
Subsequent Event [Line Items]
Milestone revenue receivable	$ 150,000,000
Maximum [Member]
Subsequent Event [Line Items]
Contingent development - and sales-based milestone payments to be received	3,010,000,000
Achievement of Specified Research, Clinical Development, Regulatory and First Commercial Sale Milestones [Member]
Subsequent Event [Line Items]
Contingent development - and sales-based milestone payments to be received	1,260,000,000
Achievement of Specified Sales-based Milestones if Annual Worldwide Net Sales of Licensed Products Reach Specified Levels [Member]
Subsequent Event [Line Items]
Contingent development - and sales-based milestone payments to be received	$ 1,750,000,000

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- Definition

Contingent development and sales based milestone payments to be received.

+ References

No definition available.

+ Details

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- Definition

Milestone​ revenue receivable.

+ References

No definition available.

+ Details

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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