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Inventory - Schedule of Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 2,260us-gaap_InventoryRawMaterialsNetOfReserves $ 1,299us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 2,509us-gaap_InventoryWorkInProcessNetOfReserves 2,157us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 3,118us-gaap_InventoryFinishedGoodsNetOfReserves 1,988us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory, net $ 7,887us-gaap_InventoryNet $ 5,444us-gaap_InventoryNet