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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Dec. 28, 2013
Current deferred tax assets    
Deferred Tax Assets, Reserves and Accruals, current $ 18,568irbt_DeferredTaxAssetsReservesandAccrualscurrent $ 18,554irbt_DeferredTaxAssetsReservesandAccrualscurrent
Stock-based compensation 767irbt_DeferredTaxAssetsStockBasedCompensationCurrent 556irbt_DeferredTaxAssetsStockBasedCompensationCurrent
Net operating loss carryforwards 2,470irbt_DeferredTaxAssetsOperatingLossCarryforwardsCurrent 2,470irbt_DeferredTaxAssetsOperatingLossCarryforwardsCurrent
Foreign tax credits 148us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 105us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (1,100)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total current deferred tax assets 21,953us-gaap_DeferredTaxAssetsNetCurrent 20,585us-gaap_DeferredTaxAssetsNetCurrent
Non-current deferred tax assets    
Reserves and accruals 586us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 715us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Tax credits 5,927us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 5,737us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Property and equipment 178irbt_NonCurrentNetDeferredTaxAssetsFromFixedAssets 1,308irbt_NonCurrentNetDeferredTaxAssetsFromFixedAssets
Stock-based compensation 5,011us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 4,957us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss carryforwards 3,879irbt_DeferredTaxAssetsNetOperatingLossCarryforwardNonCurrent 6,587irbt_DeferredTaxAssetsNetOperatingLossCarryforwardNonCurrent
Valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (990)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Total non-current deferred tax assets 15,581us-gaap_DeferredTaxAssetsNetNoncurrent 18,314us-gaap_DeferredTaxAssetsNetNoncurrent
Current deferred tax liabilities    
Deferred Tax Liabilities, Prepaid Expenses 448us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 441us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Total current deferred tax liabilities 448us-gaap_DeferredTaxLiabilitiesCurrent 441us-gaap_DeferredTaxLiabilitiesCurrent
Non-current deferred tax liabilities    
Intangible assets 7,172us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 8,219us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total non-current deferred tax liabilities 7,172us-gaap_DeferredTaxLiabilitiesNoncurrent 8,219us-gaap_DeferredTaxLiabilitiesNoncurrent
Total net deferred tax assets $ 29,914us-gaap_DeferredTaxAssetsNet $ 30,239us-gaap_DeferredTaxAssetsNet