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Acquisition Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 12, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |
Goodwill |  | 30,149 us-gaap_Goodwill | $ 30,149 us-gaap_Goodwill
ADAPTIX, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of net tangible assets acquired | 10,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember |  |
Intangible assets acquired - patents | 150,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember |  |
Goodwill | 30,149 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember |  |
Net deferred income tax liability | (30,149)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember |  |
Total | 160,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember |  |
Patents, useful life | 10 years | 10 years |
Patents, future annual amortization expense per year | $ 15,000 actg_FiniteLivedIntangibleAssetsFutureAmortizationExpensePerYear / us-gaap_BusinessAcquisitionAxis = actg_AdaptixIncMember |  |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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