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Retirement savings plan (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Retirement Savings Plan Narrative Details |  |
401 (k) Employee Maximum Contribution Percentage | 6.00% |
Company matching employee contribution percentage | 50.00% |
Contribution to 401 (k) plan | $ 0 | $ 44,000

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- Definition Company matching employee contribution percentage + References No definition available. + Details
Name: | mvis_CompanyMatchingEmployeeContributionPercentage
Namespace Prefix: | mvis_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition 401 (k) Employee Maximum Contribution Percentage + References No definition available. + Details
Name: | mvis_DefinedBenefitPlanEligibleEmployeeMaximumContributionPercentage
Namespace Prefix: | mvis_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration