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Inventories - Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials	$ 1,141	$ 1,493
Work-in-process	4,048	2,834
Finished goods	1,103	1,126
Inventory, Gross	6,292	5,453
Less: allowance	(199)	(237)
Total inventories	$ 6,093	$ 5,216

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