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Long-term contracts (Costs Incurred on Contracts) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long-term Contracts Costs Incurred On Contracts Details    
Costs and estimated earnings incurred on uncompleted contracts $ 314mvis_CostsAndEstimatedEarningsIncurredOnUncompletedContracts $ 2,909mvis_CostsAndEstimatedEarningsIncurredOnUncompletedContracts
Billings on uncompleted contracts (544)mvis_BillingsOnUncompletedContracts (3,589)mvis_BillingsOnUncompletedContracts
Net of costs and billings on uncompleted contracts (230)mvis_NetOfCostsAndBillingsOnUncompletedContracts (680)mvis_NetOfCostsAndBillingsOnUncompletedContracts
Billings on uncompleted contracts in excess of related costs (230)us-gaap_BillingsInExcessOfCostCurrent (680)us-gaap_BillingsInExcessOfCostCurrent
Net of costs and billings on uncompleted contracts $ (230)mvis_NetOfCostsAndBillingsOnUncompletedContracts $ (680)mvis_NetOfCostsAndBillingsOnUncompletedContracts