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Inventories - Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Inventory [Line Items] |  |
Raw materials | $ 971 | $ 1,056
Work-in-process | 2,628 | 2,168
Finished goods |  |
Inventory, Gross | 3,599 | 3,224
Less: allowance | (57) | (40)
Total inventories | $ 3,542 | $ 3,184

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