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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, 2016 | $ 267,443 | $ 50 | $ (34,640) | $ 642,453 | $ (76) | $ (342,198) | $ 1,854
Common stock, shares outstanding at Dec. 31, 2016 |  | 50,476,042 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | 22,180 |  |  |  |  | 22,180 |
Stock Repurchased During Period, Shares |  | (8,669) |  |  |  |  |
Stock options exercised, shares |  | 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 |  |  | 5,844 |  |  |
Net (income) loss attributable to noncontrolling interests in subsidiaries | (496) |  |  |  |  |  | (496)
Foreign Currency Transaction Gain (Loss), Unrealized | 28 |  |  |  | 28 |  |
Unrealized Gain (Loss) on Investments | (40) |  |  |  | (40) |  |
Payments for Repurchase of Common Stock | 0 |  |  |  |  |  |
Repurchase of restricted common stock | (45) |  |  | 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 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation | $ (105,029) |  |  |  |  | (105,029) |
Treasury stock, shares acquired |  | (1,190,420) |  |  |  |  |
Stock Repurchased During Period, Shares | 1,190,420 | (59,800) |  |  |  |  |
Stock options exercised, shares | 83,000 | 82,615 |  |  |  |  |
Proceeds from Stock Options Exercised | $ 257 |  |  | 257 |  |  |
Stock options exercised, value | 257 |  |  |  |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 166,998 |  |  |  |  |
Non-cash stock compensation | (317) | $ 1 |  |  |  |  |
General and administrative expenses excluding share-based compensation | 2,133 |  |  | 2,132 |  |  |
Net (income) loss attributable to noncontrolling interests in subsidiaries | 181 |  |  |  |  |  | 181
Foreign Currency Transaction Gain (Loss), Unrealized | 88 |  |  |  | 88 |  |
Payments for Repurchase of Common Stock | (4,634) | 2 | 4,632 |  |  |  |
Repurchase of restricted common stock | (229) |  |  | 229 |  |  |
Balance at Dec. 31, 2018 | $ 191,240 | $ 50 | $ (39,272) | $ 651,156 | $ 0 | (422,541) | 1,847
Common stock, shares outstanding at Dec. 31, 2018 | 49,639,319 | 49,639,319 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 2,814 |  |  |  |  | $ 2,506 | $ 308
Treasury Stock, Common, Value | $ (4,634) |  |  |  |  |  |

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