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Intangible and Other Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 12,040 $ 12,700
Less accumulated amortization (6,476) (6,957)
Intangible assets, net 5,564 5,743
Other assets 63 42
Intangible and other assets 5,627 5,785
Capitalized patent and license costs
   
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross 6,139 6,799
Purchased technology
   
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 5,901 $ 5,901