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Product Development Obligations - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
DevelopmentObligation
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Number of product development obligations | DevelopmentObligation 11  
Accrued product development costs excluding interest $ 9.9 $ 10.3
Accrued Interest $ 4.9 $ 4.8
Bank of Finland Interest Rate [Member]    
Debt Instrument [Line Items]    
Interest rate percentage 1.00%  
Minimum [Member]    
Debt Instrument [Line Items]    
Interest rate on product development advances 3.00%