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Income Taxes Deferred Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss and capital loss carryforwards and credits $ 59,427actg_DeferredTaxAssetOperatingAndCapitalLossCarryforwardsAndCredits $ 34,679actg_DeferredTaxAssetOperatingAndCapitalLossCarryforwardsAndCredits
Stock compensation 1,800us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 3,052us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Basis of investments in affiliates 1,437us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries 867us-gaap_DeferredTaxAssetsInvestmentInSubsidiaries
Accrued liabilities and other 409us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 387us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Unrealized loss on short-term investments 92us-gaap_DeferredTaxAssetsOtherComprehensiveLoss 337us-gaap_DeferredTaxAssetsOtherComprehensiveLoss
State taxes 26us-gaap_DeferredTaxAssetsStateTaxes 18us-gaap_DeferredTaxAssetsStateTaxes
Total deferred tax assets 63,191us-gaap_DeferredTaxAssetsGross 39,340us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Fixed assets and intangibles (27,157)actg_DeferredTaxLiabilitiesFixedAssetsAndIntangibles (33,378)actg_DeferredTaxLiabilitiesFixedAssetsAndIntangibles
Other (107)us-gaap_DeferredTaxLiabilitiesOther (112)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross (27,264)us-gaap_DeferredIncomeTaxLiabilities (33,490)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liabilities 0actg_DeferredTaxLiabilitiesNetOfDeferredTaxAssets (1,735)actg_DeferredTaxLiabilitiesNetOfDeferredTaxAssets
Less: valuation allowance (35,927)us-gaap_DeferredTaxAssetsValuationAllowance (7,585)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred taxes $ 27,264us-gaap_DeferredTaxAssetsNet $ 31,755us-gaap_DeferredTaxAssetsNet