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Patents and Other Intangible Assets - Schedule of Patents and Other Intangibles Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]    
Cost $ 42,324 $ 43,264
Accumulated amortization (37,022) (36,112)
Patents and other intangible assets, net 5,302 7,152
Patents [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Cost 35,637 35,420
Accumulated amortization (32,088) (31,198)
Trademarks—finite lived [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Cost 439 596
Accumulated amortization (392) (469)
Licenses and other [Member]    
Finite And Indefinite Lived Intangible Assets [Line Items]    
Cost 6,248 7,248
Accumulated amortization $ (4,542) $ (4,445)