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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 4,474 $ 4,979
Work in process 6,523 5,410
Finished goods 13,871 16,136
Total inventories $ 24,868 $ 26,525