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Inventories- Schedule of Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw materials $ 8,506us-gaap_InventoryRawMaterialsNetOfReserves $ 489us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 20,508us-gaap_InventoryWorkInProcessNetOfReserves 9,981us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 1,834us-gaap_InventoryFinishedGoodsNetOfReserves 3,677us-gaap_InventoryFinishedGoodsNetOfReserves
Total $ 30,848us-gaap_InventoryNet $ 14,147us-gaap_InventoryNet