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Schedule Intangible and Other Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 12,700 $ 12,366
Less accumulated amortization (6,957) (5,332)
Intangible assets, net 5,743 7,034
Other assets 42 38
Intangible and other assets 5,785 7,072
Capitalized patent and license costs [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 6,799 6,465
Purchased Technology [Member]
   
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 5,901 $ 5,901