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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Allowance for uncollectible accounts receivable $ 366us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances $ 342us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReturnsAndAllowances
Accrued compensation expense 5,492us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 5,001us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Inventory differences 2,401us-gaap_DeferredTaxAssetsInventory 2,317us-gaap_DeferredTaxAssetsInventory
Net operating loss carryforwards 13,542us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 18,060us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred revenue 87us-gaap_DeferredTaxAssetsDeferredIncome 280us-gaap_DeferredTaxAssetsDeferredIncome
Stock-based compensation expense 2,479us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,704us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Uncertain tax positions 284mmsi_DeferredIncomeTaxAssetUncertainTaxPositions 559mmsi_DeferredIncomeTaxAssetUncertainTaxPositions
Federal research and development credit carryforward 1,413us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 569us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 1,374us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Other 4,173us-gaap_DeferredTaxAssetsOther 3,197us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 31,611us-gaap_DeferredTaxAssetsGross 33,029us-gaap_DeferredTaxAssetsGross
Deferred income tax liabilities:    
Prepaid expenses (708)us-gaap_DeferredTaxLiabilitiesDeferredExpense (751)us-gaap_DeferredTaxLiabilitiesDeferredExpense
Property and equipment (23,298)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (21,893)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets (4,853)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (3,837)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other (1,150)us-gaap_DeferredTaxLiabilitiesOther (1,295)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities (30,009)us-gaap_DeferredTaxLiabilities (27,776)us-gaap_DeferredTaxLiabilities
Valuation allowance (1,603)us-gaap_DeferredTaxAssetsValuationAllowance (1,363)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets (liabilities) (1)us-gaap_DeferredTaxAssetsLiabilitiesNet 3,890us-gaap_DeferredTaxAssetsLiabilitiesNet
Reported as:    
Deferred income tax assets - Current 6,375us-gaap_DeferredTaxAssetsNetCurrent 5,638us-gaap_DeferredTaxAssetsNetCurrent
Deferred income tax assets - Long-term 9us-gaap_DeferredTaxAssetsNetNoncurrent 800us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred income tax liabilities - Long-term $ (6,385)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (2,548)us-gaap_DeferredTaxLiabilitiesNoncurrent