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BIAL Agreement - Additional Information (Detail) - B I A L - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017
License Agreement [Line Items]
License agreement date		Feb. 09, 2017
Up-front license fees	$ (30)
Milestone payables	$ 115

X

- Definition

Up front payments received (paid) under collaborative agreements for sponsored research and development, and licensing fees

+ References

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- Definition

Date of the license agreement, in CCYY-MM-DD format.

+ References

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+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose the terms and amounts of a license agreement.

+ References

No definition available.

+ Details

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- Definition

The amount of potential milestone payments to be paid under a license agreement.

+ References

No definition available.

+ Details

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- Details

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