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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Revenues | $ 15,520 | $ 34,939 | $ 115,491 | $ 184,463
Cost of revenues: |  |  |  |
Inventor royalties | 2,353 | 5,032 | 26,444 | 22,199
Contingent legal fees | 2,547 | 8,833 | 21,603 | 19,188
Litigation and licensing expenses - patents | 10,870 | 5,973 | 30,436 | 14,622
Amortization of patents | 12,615 | 10,412 | 36,923 | 20,931
Marketing, general and administrative expenses (including non-cash stock compensation expense of $9,386 and $20,812 for the three and nine months ended September 30, 2013, respectively, and $6,285 and $17,375 for the three and nine months ended September 30, 2012, respectively) | 18,235 | 11,914 | 45,270 | 37,548
Research, consulting and other expenses - business development | 730 | 1,139 | 2,480 | 4,222
Other Cost and Expense, Operating | 3,506 | 0 | 3,506 | 0
Total operating costs and expenses | 50,856 | 43,303 | 166,662 | 118,710
Operating income (loss) | (35,336) | (8,364) | (51,171) | 65,753
Interest income | 554 | 121 | 1,393 | 277
Write off of investment | 0 | (45) | 0 | (45)
Net gain (loss) on investments | (274) | (117) | 577 | (115)
Total other income (loss) | 280 | (41) | 1,970 | 117
Income (loss) before benefit from (provision for) income taxes | (35,056) | (8,405) | (49,201) | 65,870
Benefit from (provision for) income taxes | 19,570 | 1,938 | 25,348 | (16,303)
Net income (loss) including noncontrolling interests in operating subsidiaries | (15,486) | (6,467) | (23,853) | 49,567
Net (income) loss attributable to noncontrolling interests in operating subsidiaries | (225) | (152) | 752 | 63
Net income (loss) attributable to Acacia Research Corporation | (15,711) | (6,619) | (23,101) | 49,630
Net Income (Loss) Available to Common Stockholders, Basic | (15,904) | (6,619) | (23,458) | 47,989
Net Income (Loss) Available to Common Stockholders, Diluted | $ (15,904) | $ (6,619) | $ (23,458) | $ 48,000
Net income (loss) per common share attributable to Acacia Research Corporation: |  |  |  |
Basic earnings (loss) per share | $ (0.33) | $ (0.14) | $ (0.49) | $ 1.02
Diluted earnings (loss) per share | $ (0.33) | $ (0.14) | $ (0.49) | $ 1.02
Weighted average number of shares outstanding, basic | 48,330,149 | 48,332,878 | 48,068,038 | 46,886,820
Weighted average number of shares outstanding, diluted | 48,530,105 | 48,641,374 | 48,288,937 | 47,239,135

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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