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Income taxes (Deferred Tax Assets) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets, current |  |
Reserves | $ 2,526,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances | $ 2,994,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances
Other | 617,000us-gaap_DeferredTaxAssetsOther | 621,000us-gaap_DeferredTaxAssetsOther
Total gross deferred tax assets, current | 3,143,000mvis_TotalGrossDeferredTaxAssetsCurrent | 3,615,000mvis_TotalGrossDeferredTaxAssetsCurrent
Deferred tax assets, noncurrent |  |
Net operating loss carryforwards | 116,520,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 111,339,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
R&D credit carryforwards | 6,520,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 6,277,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Depreciation/amortization deferred | 22,642,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 24,526,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other | 7,846,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther | 7,544,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsOther
Total gross deferred tax assets, noncurrent | 153,528,000mvis_TotalGrossDeferredTaxAssetsNoncurrent | 149,686,000mvis_TotalGrossDeferredTaxAssetsNoncurrent
Net deferred taxes before valuation allowance | 156,671,000us-gaap_DeferredTaxAssetsGross | 153,301,000us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance | (156,671,000)us-gaap_DeferredTaxAssetsValuationAllowance | (153,301,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets | $ 0us-gaap_DeferredTaxAssetsNet | $ 0us-gaap_DeferredTaxAssetsNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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