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Summary of Significant Accounting Policies (Concentration of Sales to Major Customers Narrative) (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Customer Revenue Concentration |  |
Concentration Risk, Percentage | 65.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CustomerConcentrationRiskMember | 86.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_CustomerConcentrationRiskMember
Accounts Receivable Concentration |  |
Concentration Risk, Percentage | 80.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = mvis_AccountsReceivableConcentrationRiskMember |

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