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Fair Value Measurements - Additional Information (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Transfers from level 1 to level 2	$ 0
Transfers from level 2 to level 1	0
Other current liabilities	9,849,000	$ 7,000,000
Merck, Sharp & Dohme Corp.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other current liabilities	7,000,000.0
Merck, Sharp & Dohme Corp. | Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other current liabilities	$ 6,800,000

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Amount of transfers of financial instruments classified in shareholders' equity measured on a recurring basis out of level 1 of the fair value hierarchy into level 2.

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