Subsequent Events (Notes)	12 Months Ended
Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	SUBSEQUENT EVENTS Investments In January 2018, Acacia entered into a Joint Venture and Services Agreement (“Joint Venture Agreement”) with Bitzumi, Inc., a company developing macro opportunities in the cryptocurrency and blockchain industries, including a next generation decentralized exchange. Bitzumi recently filed a Regulation A Offering Statement with the Securities and Exchange Commission and a listing application with NASDAQ. Acacia made an initial $1,000,000 equity investment in Bitzumi in January 2018. Under the Joint Venture Agreement, Acacia will provide various patent-related services to Bitzumi and has the option to invest up to an additional $9,000,000 to acquire Bitzumi common stock. In connection with Acacia’s initial investment, Acacia received a short-term warrant to purchase $4,000,000 of Bitzumi common shares. Under the Joint Venture Agreement, Acacia has a right to acquire up to an aggregate of $10.0 million of Bitzumi common shares (inclusive of Acacia’s initial $1,000,000 equity investment and exercise of Acacia’s short-term warrant) at a price, except as paid by Acacia for the initial investment and the exercise price of Acacia’s short-term warrant, of $2.50 per share. Upon meeting certain conditions set forth in the Joint Venture Agreement, Bitzumi will also issue Acacia a warrant for 30,000,000 shares of Bitzumi’s common stock. Acacia’s investment in Bitzumi represents its first venture in the cryptocurrency and blockchain marketplaces. In February 2018, Acacia made an additional equity investment in Miso Robotics totaling $6,000,000, increasing its ownership interest in Miso Robotics to approximately 30%. In addition, Acacia acquired an additional board seat. Stock Repurchase Program. In February 2018, Acacia’s Board of Directors authorized the repurchase of up to $20,000,000 of the Company’s outstanding common stock in open market purchases or private purchases, from time to time, in amounts and at prices to be determined by the Board of Directors at its discretion (the “Stock Repurchase Program”). In determining whether or not to repurchase any shares of Acacia’s common stock, Acacia’s Board of Directors will consider such factors as the impact of the repurchase on Acacia’s cash position, as well as Acacia’s capital needs and whether there is a better alternative use of Acacia’s capital. Acacia has no obligation to repurchase any amount of its common stock under the Stock Repurchase Program. The Stock Repurchase Program is set to expire on February 28, 2019.

SUBSEQUENT EVENTS

Investments

In January 2018, Acacia entered into a Joint Venture and Services Agreement (“Joint Venture Agreement”) with Bitzumi, Inc., a company developing macro opportunities in the cryptocurrency and blockchain industries, including a next generation decentralized exchange. Bitzumi recently filed a Regulation A Offering Statement with the Securities and Exchange Commission and a listing application with NASDAQ. Acacia made an initial $1,000,000 equity investment in Bitzumi in January 2018. Under the Joint Venture Agreement, Acacia will provide various patent-related services to Bitzumi and has the option to invest up to an additional $9,000,000 to acquire Bitzumi common stock. In connection with Acacia’s initial investment, Acacia received a short-term warrant to purchase $4,000,000 of Bitzumi common shares. Under the Joint Venture Agreement, Acacia has a right to acquire up to an aggregate of $10.0 million of Bitzumi common shares (inclusive of Acacia’s initial $1,000,000 equity investment and exercise of Acacia’s short-term warrant) at a price, except as paid by Acacia for the initial investment and the exercise price of Acacia’s short-term warrant, of $2.50 per share. Upon meeting certain conditions set forth in the Joint Venture Agreement, Bitzumi will also issue Acacia a warrant for 30,000,000 shares of Bitzumi’s common stock. Acacia’s investment in Bitzumi represents its first venture in the cryptocurrency and blockchain marketplaces.

In February 2018, Acacia made an additional equity investment in Miso Robotics totaling $6,000,000, increasing its ownership interest in Miso Robotics to approximately 30%. In addition, Acacia acquired an additional board seat.

Stock Repurchase Program.

In February 2018, Acacia’s Board of Directors authorized the repurchase of up to $20,000,000 of the Company’s outstanding common stock in open market purchases or private purchases, from time to time, in amounts and at prices to be determined by the Board of Directors at its discretion (the “Stock Repurchase Program”). In determining whether or not to repurchase any shares of Acacia’s common stock, Acacia’s Board of Directors will consider such factors as the impact of the repurchase on Acacia’s cash position, as well as Acacia’s capital needs and whether there is a better alternative use of Acacia’s capital. Acacia has no obligation to repurchase any amount of its common stock under the Stock Repurchase Program. The Stock Repurchase Program is set to expire on February 28, 2019.