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Inventories - Summary of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Inventory Disclosure [Abstract] |  |
Raw materials | $ 19,921 | $ 19,744
Work-in-process | 3,224 | 3,979
Finished goods | 4,974 | 5,973
Net balance | $ 28,119 | $ 29,696

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