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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Deficit [Member] | Noncontrolling Interests [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 489,048 | $ 50 | $ (34,640) | $ 646,595 | $ (353) | $ (128,095) | $ 5,491
Common stock, shares outstanding at Dec. 31, 2014 |  | 50,065,382 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | (160,036) |  |  |  |  | (160,036) |
Payments of Dividends | (25,434) |  |  | (25,434) |  |  |
Stock options exercised, shares |  | 135,000 |  |  |  |  |
Proceeds from Stock Options Exercised | 938 |  |  |  |  |  |
Stock options exercised, value | 938 |  |  | 938 |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 450,857 |  |  |  |  |
Non-cash stock compensation | 11,048 | $ 1 |  | 11,047 |  |  |
Net (income) loss attributable to noncontrolling interests in subsidiaries | 2,558 |  |  |  |  |  | 2,558
Payments to Noncontrolling Interests | 4,105 |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized | (123) |  |  |  | (123) |  |
Unrealized Gain (Loss) on Investments | 261 |  |  |  | 261 |  |
Distributions to noncontrolling interests in operating subsidiary | (4,105) |  |  |  |  |  | (4,105)
Payments for Repurchase of Common Stock | 0 |  |  |  |  |  |
Balance at Dec. 31, 2015 | 314,155 | $ 51 | (34,640) | 633,146 | (215) | (288,131) | 3,944
Common stock, shares outstanding at Dec. 31, 2015 |  | 50,651,239 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | (54,067) |  |  |  |  | (54,067) |
Payments of Dividends | $ 0 |  |  |  |  |  |
Stock Repurchased During Period, Shares | (13,529) |  |  |  |  |  |
Stock options exercised, shares |  | 100,992 |  |  |  |  |
Proceeds from Stock Options Exercised | $ 326 |  |  |  |  |  |
Stock options exercised, value |  |  |  | 326 |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | (262,660) |  |  |  |  |
Non-cash stock compensation | 9,062 | $ (1) |  | 9,063 |  |  |
Net (income) loss attributable to noncontrolling interests in subsidiaries | (732) |  |  |  |  |  | (732)
Payments to Noncontrolling Interests | 1,358 |  |  |  |  |  | (1,358)
Foreign Currency Transaction Gain (Loss), Unrealized |  |  |  |  | 99 |  |
Unrealized Gain (Loss) on Investments |  |  |  |  | 40 |  |
Distributions to noncontrolling interests in operating subsidiary |  |  |  |  |  |  | (1,358)
Payments for Repurchase of Common Stock | (82) |  |  |  |  |  |
Balance at Dec. 31, 2016 | $ 267,443 | $ 50 | (34,640) | 642,453 | (76) | (342,198) | 1,854
Common stock, shares outstanding at Dec. 31, 2016 | 50,476,042 | 50,476,042 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | $ 22,180 |  |  |  |  | 22,180 |
Payments of Dividends | $ 0 |  |  |  |  |  |
Stock Repurchased During Period, Shares | (8,669) |  |  |  |  |  |
Stock options exercised, shares | 208,000 | 207,863 |  |  |  |  |
Proceeds from Stock Options Exercised | $ 745 | $ 1 |  | 744 |  |  |
Stock options exercised, value |  |  |  | 745 |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | (35,310) |  |  |  |  |
Non-cash stock compensation | 8,885 | $ 0 |  |  |  |  |
General and administrative expenses excluding share-based compensation |  |  |  | 5,844 |  |  |
Net (income) loss attributable to noncontrolling interests in subsidiaries | (496) |  |  |  |  |  | (496)
Payments to Noncontrolling Interests | 0 |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized |  |  |  |  | 28 |  |
Unrealized Gain (Loss) on Investments |  |  |  |  | (40) |  |
Payments for Repurchase of Common Stock | (45) |  |  |  |  |  |
Balance at Dec. 31, 2017 | $ 295,659 | $ 51 | $ (34,640) | $ 648,996 | $ (88) | $ (320,018) | $ 1,358
Common stock, shares outstanding at Dec. 31, 2017 | 50,639,926 | 50,639,926 |  |  |  |  |

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