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Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Accrued liabilities not currently deductible $ 1,589us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 1,631us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Intangible assets-excess of financial statement over tax amortization 12,156mchx_DeferredTaxAssetIntangibleAssets 14,208mchx_DeferredTaxAssetIntangibleAssets  
Goodwill recognized on financial statements in excess of tax amortization 11,864us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 15,420us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses  
Stock-based compensation 4,542us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 5,158us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Federal net operating losses and AMT credit carryforwards 5,209us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 3,897us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic  
State and city net operating loss carryforwards 5,964us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 5,883us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal  
Research & experimental tax credit carryforwards 2,626us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 2,613us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch  
Other 852us-gaap_DeferredTaxAssetsOther 582us-gaap_DeferredTaxAssetsOther  
Gross deferred tax assets 44,802us-gaap_DeferredTaxAssetsGross 49,392us-gaap_DeferredTaxAssetsGross  
Valuation allowance (44,802)us-gaap_DeferredTaxAssetsValuationAllowance (23,034)us-gaap_DeferredTaxAssetsValuationAllowance (21,600)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets   26,358us-gaap_DeferredTaxAssetsNet  
Deferred tax liabilities:      
Excess of tax over financial statement depreciation   204us-gaap_DeferredTaxLiabilitiesDeferredExpense  
Total deferred tax liabilities   204us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax assets   $ 26,154us-gaap_DeferredTaxAssetsLiabilitiesNet