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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory [Line Items]    
Finished goods $ 9,787us-gaap_InventoryFinishedGoodsNetOfReserves $ 9,117us-gaap_InventoryFinishedGoodsNetOfReserves
Work in process 20,835us-gaap_InventoryWorkInProcessNetOfReserves 17,218us-gaap_InventoryWorkInProcessNetOfReserves
Raw materials 13,454us-gaap_InventoryRawMaterialsNetOfReserves 7,331us-gaap_InventoryRawMaterialsNetOfReserves
Inventory, Net $ 44,076simo_Inventory $ 33,666simo_Inventory