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Consolidated Statements of Stockholders' Equity (USD $) | 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, 2009 | $ 55,969,000 | $ 32,000 | $ 0 | $ 173,672,000 | $ 0 | $ (120,242,000) | $ 2,507,000
Common stock, shares outstanding at Dec. 31, 2009 |  | 31,912,066 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to Acacia Research Corporation | 34,051,000 |  |  |  |  | 34,051,000 |
Stock options exercised, shares |  | 2,852,002 |  |  |  |  |
Stock options exercised, value | 15,068,000 | 3,000 |  | 15,065,000 |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 1,265,000 |  |  |  |  |
Compensation expense related to stock options and restricted stock awards | 7,121,000 | 1,000 |  | 7,120,000 |  |  |
Excess tax benefits from stock-based compensation | 1,302,000 |  |  | 1,302,000 |  |  |
Net income (loss) attributable to noncontrolling interest | 2,965,000 |  |  |  |  |  | 2,965,000
Contributions from noncontrolling interests in operating subsidiary, net | 2,317,000 |  |  |  |  |  | 2,317,000
Distributions to noncontrolling interests in operating subsidiary | (4,807,000) |  |  |  |  |  | (4,807,000)
Adjustments to Additional Paid in Capital, Other | (133,000) |  |  | (133,000) |  |  |
Unrealized gain on foreign currency translation | 0 |  |  |  |  |  |
Unrealized gain (loss) on short-term investments | 0 |  |  |  |  |  |
Balance at Dec. 31, 2010 | 113,853,000 | 36,000 | 0 | 197,026,000 | 0 | (86,191,000) | 2,982,000
Common stock, shares outstanding at Dec. 31, 2010 |  | 36,029,068 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to Acacia Research Corporation | 21,106,000 |  |  |  |  | 21,106,000 |
Sale of common stock, shares |  | 5,750,000 |  |  |  |  |
Sale of common stock, value |  | 6,000 |  | 175,223,000 |  |  |
Proceeds from Issuance or Sale of Equity | 175,229,000 |  |  |  |  |  |
Stock options exercised, shares |  | 87,068 |  |  |  |  |
Stock options exercised, value | 411,000 |  |  | 411,000 |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 1,061,865 |  |  |  |  |
Compensation expense related to stock options and restricted stock awards | 13,579,000 | 1,000 |  | 13,578,000 |  |  |
Excess tax benefits from stock-based compensation | 583,000 |  |  | 583,000 |  |  |
Net income (loss) attributable to noncontrolling interest | 539,000 |  |  |  |  |  | 539,000
Contributions from noncontrolling interests in operating subsidiary, net | 1,539,000 |  |  |  |  |  | 1,539,000
Distributions to noncontrolling interests in operating subsidiary | (2,897,000) |  |  |  |  |  | (2,897,000)
Unrealized gain on foreign currency translation | 0 |  |  |  |  |  |
Unrealized gain (loss) on short-term investments | (1,830,000) |  |  |  |  |  |
Balance at Dec. 31, 2011 | 322,112,000 | 43,000 | 0 | 386,821,000 | (1,830,000) | (65,085,000) | 2,163,000
Common stock, shares outstanding at Dec. 31, 2011 | 42,928,001 | 42,928,001 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income attributable to Acacia Research Corporation | 59,453,000 |  |  |  |  |  |
Sale of common stock, shares |  | 6,122,449 |  |  |  |  |
Sale of common stock, value | 218,961,000 | 6,000 |  | 218,955,000 |  |  |
Treasury stock, shares acquired | 1,129,408 | (1,129,408) |  |  |  |  |
Treasury stock, cost of shares acquired | (26,732,000) |  | (26,731,000) |  |  |  |
Stock options exercised, shares | 71,000 | 71,272 |  |  |  |  |
Stock options exercised, value | 340,000 |  |  | 340,000 |  |  |
Stock issued during period, shares, share-based compensation, net of forfeitures |  | 1,168,530 |  |  |  |  |
Compensation expense related to stock options and restricted stock awards | 25,657,000 | 1,000 |  | 25,656,000 |  |  |
Excess tax benefits from stock-based compensation | 13,210,000 |  |  | 13,210,000 |  |  |
Net income (loss) attributable to noncontrolling interest | (164,000) |  |  |  |  |  | (164,000)
Contributions from noncontrolling interests in operating subsidiary, net | 5,793,000 |  |  |  |  |  | 5,793,000
Distributions to noncontrolling interests in operating subsidiary | (816,000) |  |  |  |  |  | (816,000)
Unrealized gain on foreign currency translation | 7,000 |  |  |  | 7,000 |  |
Unrealized gain (loss) on short-term investments | 657,000 |  |  |  | 657,000 |  |
Balance at Dec. 31, 2012 | $ 618,478,000 | $ 49,000 | $ (26,731,000) | $ 644,982,000 | $ (1,166,000) | $ (5,632,000) | $ 6,976,000
Common stock, shares outstanding at Dec. 31, 2012 | 49,160,844 | 49,160,844 |  |  |  |  |

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