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Inventories - Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 960us-gaap_InventoryRawMaterials $ 940us-gaap_InventoryRawMaterials
Work-in-process 2,259us-gaap_InventoryWorkInProcess 1,902us-gaap_InventoryWorkInProcess
Less: allowance (91)us-gaap_InventoryAdjustments (73)us-gaap_InventoryAdjustments
Total inventories $ 3,128us-gaap_InventoryNet $ 2,769us-gaap_InventoryNet