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Inventories - Schedule of Inventory Reserve (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Inventory reserve at January 1 $ 4,464us-gaap_InventoryValuationReserves $ 3,788us-gaap_InventoryValuationReserves
Current year reserve 583emri_InventoriesReserveCurrentYearReserve 698emri_InventoriesReserveCurrentYearReserve
Written off in year (438)emri_InventoriesReserveWrittenOffInYear (148)emri_InventoriesReserveWrittenOffInYear
Foreign currency translation 83emri_InventoriesReserveForeignCurrencyTranslation 126emri_InventoriesReserveForeignCurrencyTranslation
Inventory reserve at December 31 $ 4,692us-gaap_InventoryValuationReserves $ 4,464us-gaap_InventoryValuationReserves