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BALANCE SHEET DETAILS - Summary of Components of Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventories:    
Purchased parts and raw materials $ 28,143us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves $ 26,842us-gaap_InventoryRawMaterialsAndPurchasedPartsNetOfReserves
Work-in-process 10,832us-gaap_InventoryWorkInProcessNetOfReserves 4,260us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 1,604us-gaap_InventoryFinishedGoodsNetOfReserves 3,024us-gaap_InventoryFinishedGoodsNetOfReserves
Inventories, net $ 40,579us-gaap_InventoryNet $ 34,126us-gaap_InventoryNet