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Retirement savings plan (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Retirement Savings Plan Narrative Details |  |  |
Contribution to 401 (k) plan | $ 214,000 | $ 108,000 | $ 0

X
- References No definition available. + 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