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Accounts Payable and Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accounts payable $ 121us-gaap_AccountsPayableCurrent $ 128us-gaap_AccountsPayableCurrent
Payroll and other employee benefits 1,481us-gaap_EmployeeRelatedLiabilitiesCurrent 1,039us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued vacation 806us-gaap_AccruedVacationCurrentAndNoncurrent 813us-gaap_AccruedVacationCurrentAndNoncurrent
Accrued legal expenses - patent 8,410actg_AccruedLegalExpensesPatent 5,900actg_AccruedLegalExpensesPatent
Accrual for court ordered attorneys fees 1,548actg_Accrualforcourtorderedattorneysfees 0actg_Accrualforcourtorderedattorneysfees
Accrued consulting and other professional fees 1,530us-gaap_AccruedProfessionalFeesCurrent 2,948us-gaap_AccruedProfessionalFeesCurrent
Accrued distribution to noncontrolling interest 0actg_AccruedDistributionToNoncontrollingInterest 504actg_AccruedDistributionToNoncontrollingInterest
Other accrued liabilities 964us-gaap_OtherAccruedLiabilitiesCurrent 223us-gaap_OtherAccruedLiabilitiesCurrent
Accounts payable and accrued expenses $ 14,860us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent $ 11,555us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent