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Long-term contracts (Costs Incurred on Contracts) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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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

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- Definition Total billings on uncompleted contracts + References No definition available. + Details
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Namespace Prefix: | mvis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total costs and estimated earnings incurred on uncompleted contracts. + References No definition available. + Details
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Namespace Prefix: | mvis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | mvis_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Net of total costs and total billings on uncompleted contracts + References No definition available. + Details
Name: | mvis_NetOfCostsAndBillingsOnUncompletedContracts
Namespace Prefix: | mvis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57788-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant