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Other Commitments and Contingencies Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Future Minimum License Fees Payable	Future minimum license fees payable under existing license agreements as of December 31, 2020 are immaterial for the years ended December 31, 2021 and thereafter.
Potentials Payments Under Licensing Arrangements	$ 7

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- Definition

Minimum amount of commitment for license fees

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No definition available.

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- Definition

The amount of additional payments that could be required for the achievement of certain milestones under a licensing agreement.

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No definition available.

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