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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