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Commitments and Contingencies (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]                        
Rent expense                 $ 1,523,000us-gaap_LeaseAndRentalExpense $ 1,312,000us-gaap_LeaseAndRentalExpense   $ 898,000us-gaap_LeaseAndRentalExpense
Other 0us-gaap_OtherCostAndExpenseOperating 1,548,000us-gaap_OtherCostAndExpenseOperating 0us-gaap_OtherCostAndExpenseOperating 0us-gaap_OtherCostAndExpenseOperating 0us-gaap_OtherCostAndExpenseOperating 3,506,000us-gaap_OtherCostAndExpenseOperating 0us-gaap_OtherCostAndExpenseOperating 0us-gaap_OtherCostAndExpenseOperating 1,548,000us-gaap_OtherCostAndExpenseOperating 3,506,000us-gaap_OtherCostAndExpenseOperating 0us-gaap_OtherCostAndExpenseOperating  
Loss Contingencies, Amount Requested from Defendants                 2,800,000actg_LossContingenciesAmountRequestedfromDefendants      
Partners' capital, authorized 250,000,000actg_PartnersCapitalAuthorized               250,000,000actg_PartnersCapitalAuthorized      
Cash and other assets, IP Fund 2,823,000actg_CashAndOtherAssetsIpFund       2,927,000actg_CashAndOtherAssetsIpFund       2,823,000actg_CashAndOtherAssetsIpFund 2,927,000actg_CashAndOtherAssetsIpFund    
Patents, net of accumulated amortization, IP Fund 967,000actg_PatentsNetOfAccumulatedAmortizationIpFund       1,373,000actg_PatentsNetOfAccumulatedAmortizationIpFund       967,000actg_PatentsNetOfAccumulatedAmortizationIpFund 1,373,000actg_PatentsNetOfAccumulatedAmortizationIpFund    
Investments, IP Fund 8,281,000actg_InvestmentsIpFund       11,120,000actg_InvestmentsIpFund       8,281,000actg_InvestmentsIpFund 11,120,000actg_InvestmentsIpFund    
Total assets, IP Fund 12,071,000actg_TotalAssetsIpFund       15,420,000actg_TotalAssetsIpFund       12,071,000actg_TotalAssetsIpFund 15,420,000actg_TotalAssetsIpFund    
Accrued expenses and contributions, IP Fund 1,876,000actg_AccruedExpensesAndContributionsIpFund       2,437,000actg_AccruedExpensesAndContributionsIpFund       1,876,000actg_AccruedExpensesAndContributionsIpFund 2,437,000actg_AccruedExpensesAndContributionsIpFund    
Total liabilities, IP Fund 1,876,000actg_TotalLiabilitiesIpFund       2,437,000actg_TotalLiabilitiesIpFund       1,876,000actg_TotalLiabilitiesIpFund 2,437,000actg_TotalLiabilitiesIpFund    
Net assets, IP Fund 10,195,000actg_NetAssetsFundRelated       12,983,000actg_NetAssetsFundRelated       10,195,000actg_NetAssetsFundRelated 12,983,000actg_NetAssetsFundRelated    
Revenues, IP Fund                 1,560,000actg_RevenuesIPFund 1,448,000actg_RevenuesIPFund    
IP Fund, Operating expenses                 1,724,000actg_IPFundOperatingexpenses 6,907,000actg_IPFundOperatingexpenses    
IP Fund, Gain from Operations                 (164,000)actg_IPFundGainfromOperations (5,459,000)actg_IPFundGainfromOperations    
IP Fund, Net Loss in Equity Method Investment                 (1,807,000)actg_IPFundNetLossinEquityMethodInvestment (542,000)actg_IPFundNetLossinEquityMethodInvestment    
IP Fund, Net Loss                 $ (1,971,000)actg_IPFundNetLoss $ (6,001,000)actg_IPFundNetLoss