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Patents and other intangible assets - Schedule of Patents and Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | $ 41,767 | $ 39,562
Accumulated amortization | (31,946) | (32,272)
Patents and other intangible assets, net | 9,821 | 7,290
Patents [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 41,135 | 38,905
Accumulated amortization | (31,487) | (31,845)
Trademarks - definite lived [Member] |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |
Cost | 632 | 657
Accumulated amortization | $ (459) | $ (427)

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