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v2.4.1.9

Retirement savings plan (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Retirement Savings Plan Narrative Details |  |
Contribution to 401 (k) plan | $ 0us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 0us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution

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

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- 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