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Share-Based Compensation (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Employee Stock Options  
Unrecognized compensation cost related to share-based compensation $ 1,100,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted-average service period, years 2 years 256 days
Restricted Stock Rights  
Unrecognized compensation cost related to share-based compensation $ 43,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= mvis_RestrictedStockRightsMember
Weighted-average service period, years 0 years 180 days