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Warrants (Summary of Warrant Activity) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014
Warrants Summary Of Warrant Activity Details |  |  |
Warrants, Outstanding as of beginning of period | 8,091,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 5,131,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 2,100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Granted with exercise price less than intrinsic value | 0mvis_GrantedWithExercisePriceLessThanIntrinsicValue | 2,216,000mvis_GrantedWithExercisePriceLessThanIntrinsicValue |
Granted with exercise price greater than intrinsic value | 2,148,000mvis_WarrantsGrantedWithExercisePriceGreaterThanIntrinsicValue | 1,855,000mvis_WarrantsGrantedWithExercisePriceGreaterThanIntrinsicValue |
Exercised | (3,713,000)mvis_WarrantsExercised | (358,000)mvis_WarrantsExercised |
Canceled/expired | 0mvis_WarrantsCanceledexpired | (753,000)mvis_WarrantsCanceledexpired |
Warrants, Outstanding as of end of period | 6,526,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 8,091,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 2,100,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Warrants, Weighted-Average Exercise Prices, Outstanding as of beginnig of period | $ 3.07us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 7.28us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 2.47us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrants, Weighted-Average Exercise Prices, Granted less than intrinsic value | $ 0mvis_WarrantsWeightedaverageExercisePricesGrantedLessThanIntrinsicValue | $ 2.71mvis_WarrantsWeightedaverageExercisePricesGrantedLessThanIntrinsicValue |
Warrants, Weighted-Average Exercise Prices, Granted greater than intrinsic value | $ 2.44mvis_WarrantsWeightedaverageExercisePricesGranted | $ 2.44mvis_WarrantsWeightedaverageExercisePricesGranted |
Warrants, Weighted-Average Exercise Prices, Exercised | 2.67mvis_WarrantsWeightedaverageExercisePricesExercised | 1.77mvis_WarrantsWeightedaverageExercisePricesExercised |
Warrants, Weighted-Average Exercise Prices, cancelled or expired | $ 0mvis_WarrantsWeightedaverageExercisePricesCancelledOrExpired | $ 28.80mvis_WarrantsWeightedaverageExercisePricesCancelledOrExpired |
Warrants, Weighted-Average Exercise Prices, Outstanding as of end of period | $ 3.08us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 3.07us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 2.47us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrants, Exercisable at end of period | 6,526,000mvis_WarrantsExercisableAtEndOfPeriod |  |
Warrants, Weighted-Average Exercise Price, Exercisable |  | $ 3.08mvis_WarrantsWeightedaverageExercisePriceExercisable |

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- Definition Warrants canceled or expired during the period + References No definition available. + Details
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- Definition Warrants granted during the period with exercise price greater than intrinsic value + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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