1. Description of Business and Basis of Presentation	9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Description of Business As used herein, “Acacia” and the “Company” refer to Acacia Research Corporation and/or its wholly and majority-owned and controlled operating subsidiaries, and/or where applicable, its management. Acacia’s operating subsidiaries invest in, license and enforce patented technologies. Acacia’s operating subsidiaries partner with inventors and patent owners, applying their legal and technology expertise to patent assets to unlock the financial value in their patented inventions. In recent years, Acacia has also invested in technology companies. Acacia leverages its experience, expertise, data and relationships developed as a leader in the intellectual property ("IP") industry to pursue these opportunities. In some cases, these opportunities will complement, and/or supplement Acacia’s primary licensing and enforcement business. Acacia’s operating subsidiaries generate revenues and related cash flows from the granting of IP rights (hereinafter “IP Rights”) for the use of patented technologies that its operating subsidiaries control or own. Acacia’s operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, where necessary, with the enforcement against unauthorized users of their patented technologies through the filing of patent infringement litigation. Acacia’s operating subsidiaries are principals in the licensing and enforcement effort, obtaining control of the rights in the patent portfolio, or control of the patent portfolio outright. Acacia’s operating subsidiaries own or control the rights to multiple patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries. Neither Acacia nor its operating subsidiaries invent new technologies or products; rather, Acacia depends upon the identification and investment in new patents, inventions and companies that own IP through its relationships with inventors, universities, research institutions, technology companies and others. If Acacia’s operating subsidiaries are unable to maintain those relationships and identify and grow new relationships, then they may not be able to identify new technology-based opportunities for sustainable revenue and/or revenue growth. During the nine months ended September 30, 2019, Acacia obtained control of five new patent portfolios. During fiscal year 2018 Acacia did not obtain control of any new patent portfolios. During fiscal year 2017 Acacia obtained control of one new patent portfolio. In fiscal year 2016, Acacia obtained control of two new patent portfolios. Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Acacia and its wholly and majority-owned and controlled subsidiaries. Material intercompany transactions and balances have been eliminated in consolidation. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, certain information and footnotes required by U.S. GAAP in annual financial statements have been omitted or condensed in accordance with quarterly reporting requirements of the Securities and Exchange Commission (“SEC”). These interim unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2018, as reported by Acacia in its Annual Report on Form 10-K filed with the SEC on March 15, 2019, as amended by Amendment No. 1 to Form 10-K on Form 10-K/A, filed with the SEC on April 30, 2019, as well as in our other public filings with the SEC. The December 31, 2018 condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by U.S. GAAP. The condensed consolidated interim financial statements of Acacia include all adjustments of a normal recurring nature which, in the opinion of management, are necessary for a fair statement of Acacia’s consolidated financial position as of September 30, 2019, and results of its operations and its cash flows for the interim periods presented. The consolidated results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the entire fiscal year. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Acacia believes that, of the significant accounting policies described herein, the accounting policies associated with revenue recognition, valuation of debt and equity instruments, stock-based compensation expense including the valuation of profits interests, impairment of patent-related intangible assets, impairment of other investment, the determination of the economic useful life of amortizable intangible assets, income taxes and valuation allowances against net deferred tax assets, require its most difficult, subjective or complex judgments. Reclassifications Certain reclassifications have been made to the prior fiscal year financial information to conform with the current fiscal year presentation. Such reclassifications had no impact on net income or cash flows.

1. Description of Business and Basis of Presentation

9 Months Ended

Sep. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Basis of Presentation

1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Description of Business

As used herein, “Acacia” and the “Company” refer to Acacia Research Corporation and/or its wholly and majority-owned and controlled operating subsidiaries, and/or where applicable, its management.

Acacia’s operating subsidiaries invest in, license and enforce patented technologies. Acacia’s operating subsidiaries partner with inventors and patent owners, applying their legal and technology expertise to patent assets to unlock the financial value in their patented inventions. In recent years, Acacia has also invested in technology companies. Acacia leverages its experience, expertise, data and relationships developed as a leader in the intellectual property ("IP") industry to pursue these opportunities. In some cases, these opportunities will complement, and/or supplement Acacia’s primary licensing and enforcement business.

Acacia’s operating subsidiaries generate revenues and related cash flows from the granting of IP rights (hereinafter “IP Rights”) for the use of patented technologies that its operating subsidiaries control or own. Acacia’s operating subsidiaries assist patent owners with the prosecution and development of their patent portfolios, the protection of their patented inventions from unauthorized use, the generation of licensing revenue from users of their patented technologies and, where necessary, with the enforcement against unauthorized users of their patented technologies through the filing of patent infringement litigation.

Acacia’s operating subsidiaries are principals in the licensing and enforcement effort, obtaining control of the rights in the patent portfolio, or control of the patent portfolio outright. Acacia’s operating subsidiaries own or control the rights to multiple patent portfolios, which include U.S. patents and certain foreign counterparts, covering technologies used in a wide variety of industries.

Neither Acacia nor its operating subsidiaries invent new technologies or products; rather, Acacia depends upon the identification and investment in new patents, inventions and companies that own IP through its relationships with inventors, universities, research institutions, technology companies and others. If Acacia’s operating subsidiaries are unable to maintain those relationships and identify and grow new relationships, then they may not be able to identify new technology-based opportunities for sustainable revenue and/or revenue growth.

During the nine months ended September 30, 2019, Acacia obtained control of five new patent portfolios. During fiscal year 2018 Acacia did not obtain control of any new patent portfolios. During fiscal year 2017 Acacia obtained control of one new patent portfolio. In fiscal year 2016, Acacia obtained control of two new patent portfolios.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of Acacia and its wholly and majority-owned and controlled subsidiaries. Material intercompany transactions and balances have been eliminated in consolidation.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, certain information and footnotes required by U.S. GAAP in annual financial statements have been omitted or condensed in accordance with quarterly reporting requirements of the Securities and Exchange Commission (“SEC”). These interim unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2018, as reported by Acacia in its Annual Report on Form 10-K filed with the SEC on March 15, 2019, as amended by Amendment No. 1 to Form 10-K on Form 10-K/A, filed with the SEC on April 30, 2019, as well as in our other public filings with the SEC. The December 31, 2018 condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by U.S. GAAP. The condensed consolidated interim financial statements of Acacia include all adjustments of a normal recurring nature which, in the opinion of management, are necessary for a fair statement of Acacia’s consolidated financial position as of September 30, 2019, and results of its operations and its cash flows for the interim periods presented. The consolidated results of operations for the three and nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the entire fiscal year.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. Acacia believes that, of the significant accounting policies described herein, the accounting policies associated with revenue recognition, valuation of debt and equity instruments, stock-based compensation expense including the valuation of profits interests, impairment of patent-related intangible assets, impairment of other investment, the determination of the economic useful life of amortizable intangible assets, income taxes and valuation allowances against net deferred tax assets, require its most difficult, subjective or complex judgments.

Reclassifications

Certain reclassifications have been made to the prior fiscal year financial information to conform with the current fiscal year presentation. Such reclassifications had no impact on net income or cash flows.