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Patents and other intangible assets - Schedule of Patents and Other Intangibles Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	$ 39,679		$ 39,562
Accumulated amortization	(32,744)		(32,272)
Patents and other intangible assets, net	6,935	[1]	7,290
Patents [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	39,000		38,905
Accumulated amortization	(32,292)		(31,845)
Trademarks - definite lived [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Cost	679		657
Accumulated amortization	$ (452)		$ (427)
[1] Unaudited

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Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets.

+ References

No definition available.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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