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Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Inventory Disclosure [Line Items] |  |
Work-in-process | $ 3,551 | $ 2,742
Finished goods | 6,629 | 3,702
Total inventories | $ 10,180 | $ 6,444

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