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Inventory, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Disclosure Inventory Net [Abstract]    
Raw materials $ 3,921 $ 4,867
Work in process 7,907 6,134
Finished goods 835 1,885
Inventory, net $ 12,663 $ 12,886