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Fair Value Measurements - Additional Information (Detail) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other current liabilities	$ 8,296,000	$ 7,000,000
Transfers from level 1 to level 2	0
Transfers from level 2 to level 1	0
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	$ 6,600,000

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