Commitments and Contingencies	3 Months Ended
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Patent Enforcement Certain of Acacia’s operating subsidiaries are often required to engage in litigation to enforce their patents and patent rights. In connection with any of Acacia’s operating subsidiaries’ patent enforcement actions, it is possible that a defendant may request and/or a court may rule that an operating subsidiary has violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against Acacia or its operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material. Leases The Company primarily leases office facilities under operating lease arrangements that will end in January 2020 and July 2020. The Company has elected to not apply any discount rate in our calculation given the short remaining lease term. Operating lease costs were $153,000 and $335,000 for the three months ended March 31, 2019 and 2018 respectively. The Company has subleased a facility that we ceased using in December 2018, and the sublease will go through the remaining term of the lease. The total sublease income received was $195,000 for the three months ended March 31, 2019. Other On June 17, 2015, Celltrace Communications Ltd., or Celltrace, filed a lawsuit against Acacia in U.S. District Court for the Southern District of New York, Case No. 1:15-cv-04746, alleging, among other things, significant damages for alleged breach of contract, unjust enrichment and fraud. Acacia disputes the allegations and does not believe that Celltrace is entitled to any damages. Acacia successfully moved to compel arbitration of the dispute, and the District Court stayed the litigation pending arbitration before the International Court of Arbitration for the International Chamber of Commerce, or the ICC. Celltrace appealed the decision to the U.S. Court of Appeals for the Second Circuit, which denied the appeal. Celltrace filed its request for arbitration of the claims with the ICC on November 28, 2016. Acacia filed an answer denying all allegations of wrongdoing and asserting affirmative defenses. A tribunal was appointed to preside over the arbitration and conducted its first case management conference on June 26, 2017. The parties conducted discovery and submitted their cases in chief to the tribunal in a series of written submissions per the tribunal’s orders between January 2018 and December 2018. The tribunal held an evidentiary hearing with live witness testimony in New York City between February 4, 2019 and February 13, 2019. At the end of the hearing, the tribunal set a schedule for post-hearing briefing by the parties, which concluded in April 2019. Acacia continues to vigorously contest all allegations of wrongdoing. In a separate case on December 6, 2017, the Federal Court of Canada allowed a counterclaim for invalidity of a patent asserted by Rapid Completions LLC and awarded costs payable by Rapid Completions LLC in an amount to be determined. Acacia is subject to claims, counterclaims and legal actions that arise in the ordinary course of business. Management believes that the ultimate liability with respect to these claims and legal actions, if any, will not have a material effect on Acacia’s condensed consolidated financial position, results of operations or cash flows. During the three months ended March 31, 2019, operating expenses included expenses for settlement and contingency accruals totaling $650,000.

COMMITMENTS AND CONTINGENCIES

Patent Enforcement

Certain of Acacia’s operating subsidiaries are often required to engage in litigation to enforce their patents and patent rights. In connection with any of Acacia’s operating subsidiaries’ patent enforcement actions, it is possible that a defendant may request and/or a court may rule that an operating subsidiary has violated statutory authority, regulatory authority, federal rules, local court rules, or governing standards relating to the substantive or procedural aspects of such enforcement actions. In such event, a court may issue monetary sanctions against Acacia or its operating subsidiaries or award attorney’s fees and/or expenses to a defendant(s), which could be material.

Leases

The Company primarily leases office facilities under operating lease arrangements that will end in January 2020 and July 2020. The Company has elected to not apply any discount rate in our calculation given the short remaining lease term. Operating lease costs were $153,000 and $335,000 for the three months ended March 31, 2019 and 2018 respectively. The Company has subleased a facility that we ceased using in December 2018, and the sublease will go through the remaining term of the lease. The total sublease income received was $195,000 for the three months ended March 31, 2019.

Other

On June 17, 2015, Celltrace Communications Ltd., or Celltrace, filed a lawsuit against Acacia in U.S. District Court for the Southern District of New York, Case No. 1:15-cv-04746, alleging, among other things, significant damages for alleged breach of contract, unjust enrichment and fraud. Acacia disputes the allegations and does not believe that Celltrace is entitled to any damages. Acacia successfully moved to compel arbitration of the dispute, and the District Court stayed the litigation pending arbitration before the International Court of Arbitration for the International Chamber of Commerce, or the ICC. Celltrace appealed the decision to the U.S. Court of Appeals for the Second Circuit, which denied the appeal. Celltrace filed its request for arbitration of the claims with the ICC on November 28, 2016. Acacia filed an answer denying all allegations of wrongdoing and asserting affirmative defenses. A tribunal was appointed to preside over the arbitration and conducted its first case management conference on June 26, 2017. The parties conducted discovery and submitted their cases in chief to the tribunal in a series of written submissions per the tribunal’s orders between January 2018 and December 2018. The tribunal held an evidentiary hearing with live witness testimony in New York City between February 4, 2019 and February 13, 2019. At the end of the hearing, the tribunal set a schedule for post-hearing briefing by the parties, which concluded in April 2019. Acacia continues to vigorously contest all allegations of wrongdoing.

In a separate case on December 6, 2017, the Federal Court of Canada allowed a counterclaim for invalidity of a patent asserted by Rapid Completions LLC and awarded costs payable by Rapid Completions LLC in an amount to be determined.

Acacia is subject to claims, counterclaims and legal actions that arise in the ordinary course of business. Management believes that the ultimate liability with respect to these claims and legal actions, if any, will not have a material effect on Acacia’s condensed consolidated financial position, results of operations or cash flows. During the three months ended March 31, 2019, operating expenses included expenses for settlement and contingency accruals totaling $650,000.