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Fair Values Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value assets transfers from level 1 to level 2 $ 0 $ 0
Fair value assets transfers from level 2 to level 1 0 0
Fair value liabilities transfers from level 1 to level 2 0 0
Fair value liabilities transfers from level 2 to level 1 0 0
Fair value assets transfers into level 3 0 0
Fair value assets transfers out of level 3 0 0
Fair value liabilities transfers into level 3 0 0
Fair value liabilities transfers out of level 3 0 $ 0
Liability-classified Lonza award    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Initial fair value $ 9,200,000