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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SERIES A REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Series A Redeemable Convertible Preferred Stock [Member] | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance, value at Dec. 31, 2018 |  | $ 50 | $ (39,272) | $ 651,156 | $ (422,541) | $ 1,847 | $ 191,240
Beginning balance, shares at Dec. 31, 2018 |  | 49,639,319 |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation |  |  |  |  | (17,749) |  | (17,749)
Stock options exercised |  |  |  | 79 |  |  | 79
Stock options exercised, shares |  | 25,136 |  |  |  |  |
Compensation expense for share-based awards, net of forfeitures |  |  |  | 753 |  |  | 753
Compensation expense for share-based awards, net of forfeitures, shares |  | 678,850 |  |  |  |  |
Net income attributable to noncontrolling interests in subsidiaries |  |  |  |  |  | (14) | (14)
Ending balance, value at Sep. 30, 2019 |  | $ 50 | (39,272) | 651,988 | (440,290) | 1,833 | 174,309
Ending balance, shares at Sep. 30, 2019 |  | 50,343,305 |  |  |  |  |
Beginning balance, value at Jun. 30, 2019 |  | $ 50 | (39,272) | 651,688 | (432,682) | 1,833 | 181,617
Beginning balance, shares at Jun. 30, 2019 |  | 50,132,871 |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation |  |  |  |  | (7,608) |  | (7,608)
Compensation expense for share-based awards, net of forfeitures |  |  |  | 300 |  |  | 300
Compensation expense for share-based awards, net of forfeitures, shares |  | 210,434 |  |  |  |  |
Net income attributable to noncontrolling interests in subsidiaries |  |  |  |  |  |  | (0)
Ending balance, value at Sep. 30, 2019 |  | $ 50 | (39,272) | 651,988 | (440,290) | 1,833 | 174,309
Ending balance, shares at Sep. 30, 2019 |  | 50,343,305 |  |  |  |  |
Beginning balance, value at Dec. 31, 2019 | $ 8,089 | $ 50 | (39,272) | 652,003 | (439,656) | 1,833 | 174,958
Beginning balance, shares at Dec. 31, 2019 | 350,000 | 50,370,987 |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation |  |  |  |  | 33,205 |  | 33,205
Accretion of Series A Redeemable Convertible Preferred Stock to redemption value | 2,045 |  |  | (2,045) |  |  | (2,045)
Stock options exercised |  |  |  | 48 |  |  | 48
Stock options exercised, shares |  |  |  |  |  |  |
Dividend on Series A Redeemable Convertible Preferred Stock |  |  |  | (1,119) |  |  | (1,119)
Compensation expense for share-based awards, net of forfeitures |  |  |  | 1,243 |  |  | 1,243
Compensation expense for share-based awards, net of forfeitures, shares |  | 593,003 |  |  |  |  |
Repurchase of common stock |  | $ (1) | (3,998) |  |  |  | (3,999)
Repurchase of common stock, shares |  | (1,684,537) |  |  |  |  |
Net income attributable to noncontrolling interests in subsidiaries |  |  |  |  |  |  | (0)
Ending balance, value at Sep. 30, 2020 | $ 10,134 | $ 49 | (43,270) | 650,130 | (406,451) | 1,833 | 202,291
Ending balance, shares at Sep. 30, 2020 | 350,000 | 49,279,453 |  |  |  |  |
Beginning balance, value at Jun. 30, 2020 | $ 9,400 | $ 49 | (43,270) | 650,843 | (444,799) | 1,833 | 164,656
Beginning balance, shares at Jun. 30, 2020 | 350,000 | 49,306,137 |  |  |  |  |
Net income (loss) attributable to Acacia Research Corporation |  |  |  |  | 38,348 |  | 38,348
Accretion of Series A Redeemable Convertible Preferred Stock to redemption value | 734 |  |  | (734) |  |  | (734)
Dividend on Series A Redeemable Convertible Preferred Stock |  |  |  | (467) |  |  | (467)
Compensation expense for share-based awards, net of forfeitures |  |  |  | 488 |  |  | 488
Compensation expense for share-based awards, net of forfeitures, shares |  | (26,684) |  |  |  |  |
Net income attributable to noncontrolling interests in subsidiaries |  |  |  |  |  |  | (0)
Ending balance, value at Sep. 30, 2020 | $ 10,134 | $ 49 | $ (43,270) | $ 650,130 | $ (406,451) | $ 1,833 | $ 202,291
Ending balance, shares at Sep. 30, 2020 | 350,000 | 49,279,453 |  |  |  |  |

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=120409616&loc=SL4590271-111686 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 45 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929471&loc=d3e21711-107793 Reference 15: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 Reference 16: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(1) -URI 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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant