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Inventories - Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 1,042 $ 1,056
Work-in-process 2,804 2,168
Finished goods 0 0
Inventory, Gross 3,846 3,224
Less: allowance (65) (40)
Total inventories $ 3,781 $ 3,184