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Derivative Financial Instruments - Additional Information (Detail)
3 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Foreign Currency Exchange Contracts [Member]      
Derivatives Fair Value [Line Items]      
Notional amounts on outstanding foreign currency exchange contracts | €   € 3,200,000 € 0
Research and development [Member]      
Derivatives Fair Value [Line Items]      
Gain (loss) reclassification from accumulated other comprehensive income 12 months    
Other Income (Expense) [Member]      
Derivatives Fair Value [Line Items]      
Gain (loss) on discontinuance of cash flow hedges | $ $ 0    
Maximum [Member]      
Derivatives Fair Value [Line Items]      
Derivative instruments maturity term 12 months