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Income taxes (Deferred Tax Assets) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
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