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Quarterly Financial Data (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
QUARTERLY FINANCIAL DATA (unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 31,030 us-gaap_Revenues | $ 37,192 us-gaap_Revenues | $ 50,076 us-gaap_Revenues | $ 12,578 us-gaap_Revenues | $ 15,065 us-gaap_Revenues | $ 15,520 us-gaap_Revenues | $ 23,110 us-gaap_Revenues | $ 76,861 us-gaap_Revenues |  |  |
Inventor royalties | 4,358 us-gaap_RoyaltyExpense | 4,667 us-gaap_RoyaltyExpense | 10,694 us-gaap_RoyaltyExpense | 951 us-gaap_RoyaltyExpense | 3,280 us-gaap_RoyaltyExpense | 2,353 us-gaap_RoyaltyExpense | 5,610 us-gaap_RoyaltyExpense | 18,481 us-gaap_RoyaltyExpense | 20,670 us-gaap_RoyaltyExpense | 29,724 us-gaap_RoyaltyExpense | 26,028 us-gaap_RoyaltyExpense
Contingent legal fees | 7,296 actg_ContingentLegalFees | 7,663 actg_ContingentLegalFees | 7,077 actg_ContingentLegalFees | 1,527 actg_ContingentLegalFees | 3,181 actg_ContingentLegalFees | 2,547 actg_ContingentLegalFees | 4,024 actg_ContingentLegalFees | 15,032 actg_ContingentLegalFees | 23,563 actg_ContingentLegalFees | 24,784 actg_ContingentLegalFees | 24,651 actg_ContingentLegalFees
Litigation and licensing expenses - patents | 8,208 actg_LitigationAndLicensingExpensesPatents | 9,592 actg_LitigationAndLicensingExpensesPatents | 10,820 actg_LitigationAndLicensingExpensesPatents | 8,994 actg_LitigationAndLicensingExpensesPatents | 8,899 actg_LitigationAndLicensingExpensesPatents | 10,870 actg_LitigationAndLicensingExpensesPatents | 9,918 actg_LitigationAndLicensingExpensesPatents | 9,648 actg_LitigationAndLicensingExpensesPatents | 37,614 actg_LitigationAndLicensingExpensesPatents | 39,335 actg_LitigationAndLicensingExpensesPatents | 21,591 actg_LitigationAndLicensingExpensesPatents
Amortization of patents | 13,727 us-gaap_AmortizationOfIntangibleAssets | 13,511 us-gaap_AmortizationOfIntangibleAssets | 15,532 us-gaap_AmortizationOfIntangibleAssets | 14,472 us-gaap_AmortizationOfIntangibleAssets | 16,735 us-gaap_AmortizationOfIntangibleAssets | 12,615 us-gaap_AmortizationOfIntangibleAssets | 12,578 us-gaap_AmortizationOfIntangibleAssets | 11,730 us-gaap_AmortizationOfIntangibleAssets | 57,242 us-gaap_AmortizationOfIntangibleAssets | 53,658 us-gaap_AmortizationOfIntangibleAssets | 39,019 us-gaap_AmortizationOfIntangibleAssets
Marketing, general and administrative expenses (including non-cash stock compensation expense) | (12,044)us-gaap_GeneralAndAdministrativeExpense | (11,636)us-gaap_GeneralAndAdministrativeExpense | (13,181)us-gaap_GeneralAndAdministrativeExpense | (11,693)us-gaap_GeneralAndAdministrativeExpense | (13,988)us-gaap_GeneralAndAdministrativeExpense | (18,235)us-gaap_GeneralAndAdministrativeExpense | (13,184)us-gaap_GeneralAndAdministrativeExpense | (13,844)us-gaap_GeneralAndAdministrativeExpense | (48,554)us-gaap_GeneralAndAdministrativeExpense | (59,229)us-gaap_GeneralAndAdministrativeExpense | (54,083)us-gaap_GeneralAndAdministrativeExpense
Research, consulting and other expenses - business development | 637 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 1,208 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 1,003 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 992 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 742 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 730 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 726 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 1,031 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 3,840 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 3,251 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment | 4,943 actg_ResearchConsultingAndOtherExpensesBusinessDevelopment
Other | 0 us-gaap_OtherCostAndExpenseOperating | 1,548 us-gaap_OtherCostAndExpenseOperating | 0 us-gaap_OtherCostAndExpenseOperating | 0 us-gaap_OtherCostAndExpenseOperating | 0 us-gaap_OtherCostAndExpenseOperating | 3,506 us-gaap_OtherCostAndExpenseOperating | 0 us-gaap_OtherCostAndExpenseOperating | 0 us-gaap_OtherCostAndExpenseOperating | 1,548 us-gaap_OtherCostAndExpenseOperating | 3,506 us-gaap_OtherCostAndExpenseOperating | 0 us-gaap_OtherCostAndExpenseOperating
Total operating costs and expenses | 46,270 us-gaap_OperatingCostsAndExpenses | 49,825 us-gaap_OperatingCostsAndExpenses | 58,307 us-gaap_OperatingCostsAndExpenses | 38,629 us-gaap_OperatingCostsAndExpenses | 46,825 us-gaap_OperatingCostsAndExpenses | 50,856 us-gaap_OperatingCostsAndExpenses | 46,040 us-gaap_OperatingCostsAndExpenses | 69,766 us-gaap_OperatingCostsAndExpenses | 193,031 us-gaap_OperatingCostsAndExpenses | 213,487 us-gaap_OperatingCostsAndExpenses | 170,315 us-gaap_OperatingCostsAndExpenses
Operating income (loss) | (15,240)us-gaap_OperatingIncomeLoss | (12,633)us-gaap_OperatingIncomeLoss | (8,231)us-gaap_OperatingIncomeLoss | (26,051)us-gaap_OperatingIncomeLoss | (31,760)us-gaap_OperatingIncomeLoss | (35,336)us-gaap_OperatingIncomeLoss | (22,930)us-gaap_OperatingIncomeLoss | 7,095 us-gaap_OperatingIncomeLoss | (62,155)us-gaap_OperatingIncomeLoss | (82,931)us-gaap_OperatingIncomeLoss | 80,412 us-gaap_OperatingIncomeLoss
Total other income (expense) | (451)us-gaap_OtherNonoperatingIncomeExpense | (57)us-gaap_OtherNonoperatingIncomeExpense | (196)us-gaap_OtherNonoperatingIncomeExpense | 109 us-gaap_OtherNonoperatingIncomeExpense | 161 us-gaap_OtherNonoperatingIncomeExpense | 280 us-gaap_OtherNonoperatingIncomeExpense | 400 us-gaap_OtherNonoperatingIncomeExpense | 1,290 us-gaap_OtherNonoperatingIncomeExpense | (595)us-gaap_OtherNonoperatingIncomeExpense | 2,131 us-gaap_OtherNonoperatingIncomeExpense | 937 us-gaap_OtherNonoperatingIncomeExpense
Income (loss) from operations before (provision for) benefit from income taxes | (15,691)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (12,690)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (8,427)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (25,942)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (31,599)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (35,056)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (22,530)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 8,385 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (62,750)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | (80,800)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 81,349 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
(Provision) benefit for income taxes | (450)us-gaap_IncomeTaxExpenseBenefit | (145)us-gaap_IncomeTaxExpenseBenefit | (4,689)us-gaap_IncomeTaxExpenseBenefit | 1,372 us-gaap_IncomeTaxExpenseBenefit | (3,390)us-gaap_IncomeTaxExpenseBenefit | 19,570 us-gaap_IncomeTaxExpenseBenefit | 9,050 us-gaap_IncomeTaxExpenseBenefit | (3,272)us-gaap_IncomeTaxExpenseBenefit | (3,912)us-gaap_IncomeTaxExpenseBenefit | 21,958 us-gaap_IncomeTaxExpenseBenefit | (22,060)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) including noncontrolling interests in operating subsidiaries | (16,141)us-gaap_ProfitLoss | (12,835)us-gaap_ProfitLoss | (13,116)us-gaap_ProfitLoss | (24,570)us-gaap_ProfitLoss | (34,989)us-gaap_ProfitLoss | (15,486)us-gaap_ProfitLoss | (13,480)us-gaap_ProfitLoss | 5,113 us-gaap_ProfitLoss | (66,662)us-gaap_ProfitLoss | (58,842)us-gaap_ProfitLoss | 59,289 us-gaap_ProfitLoss
Net (income) loss attributable to noncontrolling interests in operating subsidiaries | 103 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (420)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (167)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (149)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,656)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 225 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (977)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 0 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (633)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (2,408)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (164)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to Acacia Research Corporation | $ (16,244)us-gaap_NetIncomeLoss | $ (12,415)us-gaap_NetIncomeLoss | $ (12,949)us-gaap_NetIncomeLoss | $ (24,421)us-gaap_NetIncomeLoss | $ (33,333)us-gaap_NetIncomeLoss | $ (15,711)us-gaap_NetIncomeLoss | $ (12,503)us-gaap_NetIncomeLoss | $ 5,113 us-gaap_NetIncomeLoss | $ (66,029)us-gaap_NetIncomeLoss | $ (56,434)us-gaap_NetIncomeLoss | $ 59,453 us-gaap_NetIncomeLoss
Basic income (loss) per share - As Adjusted(1) | $ (0.34)us-gaap_EarningsPerShareBasic | $ (0.26)us-gaap_EarningsPerShareBasic | $ (0.27)us-gaap_EarningsPerShareBasic | $ (0.51)us-gaap_EarningsPerShareBasic | $ (0.69)us-gaap_EarningsPerShareBasic | $ (0.33)us-gaap_EarningsPerShareBasic | $ (0.26)us-gaap_EarningsPerShareBasic | $ 0.10 us-gaap_EarningsPerShareBasic | $ (1.37)us-gaap_EarningsPerShareBasic | $ (1.18)us-gaap_EarningsPerShareBasic | $ 1.22 us-gaap_EarningsPerShareBasic
Diluted income (loss) per share - As Adjusted(1) | $ (0.34)us-gaap_EarningsPerShareDiluted | $ (0.26)us-gaap_EarningsPerShareDiluted | $ (0.27)us-gaap_EarningsPerShareDiluted | $ (0.51)us-gaap_EarningsPerShareDiluted | $ (0.69)us-gaap_EarningsPerShareDiluted | $ (0.33)us-gaap_EarningsPerShareDiluted | $ (0.26)us-gaap_EarningsPerShareDiluted | $ 0.10 us-gaap_EarningsPerShareDiluted | $ (1.37)us-gaap_EarningsPerShareDiluted | $ (1.18)us-gaap_EarningsPerShareDiluted | $ 1.21 us-gaap_EarningsPerShareDiluted
Weighted-average number of shares outstanding, basic - As Adjusted(1) | 48,944,914 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,806,334 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,543,334 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,329,375 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,415,684 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,330,149 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,008,998 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 47,859,774 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,658,088 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,155,832 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 47,251,061 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average number of shares outstanding, diluted - As Adjusted(1) | 48,944,914 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,806,334 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,543,334 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,329,375 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,415,684 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,330,149 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,008,998 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,104,242 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,658,088 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,155,832 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 47,584,120 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings (loss) per share, basic, as previously reported |  |  |  |  |  |  | $ (0.26)actg_Earningslosspersharebasicaspreviouslyreported | $ 0.11 actg_Earningslosspersharebasicaspreviouslyreported |  |  |
Earnings (loss) per share, diluted as previously reported |  |  |  |  |  |  | $ (0.26)actg_Earningslosspersharedilutedaspreviouslyreported | $ 0.11 actg_Earningslosspersharedilutedaspreviouslyreported |  |  |
Weighted average number of shares, basic, as previously reported |  |  |  |  |  |  | 48,008,998 actg_Weightedaveragenumberofsharesbasicaspreviouslyreported | 47,859,774 actg_Weightedaveragenumberofsharesbasicaspreviouslyreported |  |  |
Weighted average number of shares, diluted, as previously reported |  |  |  |  |  |  | 48,008,998 actg_Weightedaveragenumberofsharesdilutedaspreviouslyreported | 48,354,444 actg_Weightedaveragenumberofsharesdilutedaspreviouslyreported |  |  |

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