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Consolidated Statements of Operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |
Revenues | $ 65,402 | $ 152,699 | $ 125,037
Cost of revenues: |  |  |
Inventor royalties | 4,952 | 22,730 | 18,462
Contingent legal fees | 16,682 | 26,474 | 16,169
Litigation and licensing expenses - patents | 18,219 | 27,858 | 39,373
Amortization of patents | 22,154 | 34,208 | 53,067
General and administrative expenses (including non-cash stock compensation expense of $8,885 in 2017, $9,062 in 2016 and $11,048 in 2015) | 26,030 | 32,919 | 38,176
Other expenses - business development | 1,189 | 3,079 | 3,391
Impairment of Patent-Related Intangible Assets | 2,248 | 42,340 | 74,731
Impairment of Goodwill | 0 | 0 | 30,149
Other | 1,200 | 500 | 4,141
Total operating costs and expenses | 92,674 | 190,108 | 277,659
Operating loss | (27,272) | (37,409) | (152,622)
Gain on Conversion of Loan and Accrued Interest | 2,671 | 0 | 0
Gain on exercise of Primary Warrant | 4,616 | 0 | 0
Change in fair value of investment | 42,239 | 0 | 0
Income (Loss) from Equity Method Investments | (220) | 0 | 0
Other Income | 1,000 | 0 | 0
Investment Income, Interest | 1,605 | 798 | (56)
Total other income (expense) | 51,911 | 798 | (56)
Income (loss) from operations before provision for income taxes | 24,639 | (36,611) | (152,678)
Provision for income taxes | (2,955) | (18,188) | (4,800)
Net income (loss) including noncontrolling interests in subsidiaries | 21,684 | (54,799) | (157,478)
Net (income) loss attributable to noncontrolling interests in subsidiaries | 496 | 732 | (2,558)
Net income (loss) attributable to Acacia Research Corporation | 22,180 | (54,067) | (160,036)
Net Loss Available to Common Stockholders, Basic and Diluted | $ 22,147 | $ (54,067) | $ (160,730)
Earnings Per Share, Basic and Diluted | $ 0.44 | $ (1.08) | $ (3.25)
Weighted Average Number of Shares Outstanding, Basic | 50,495,119 | 50,075,847 | 49,505,817
Weighted Average Number of Shares Outstanding, Diluted | 50,692,012 | 50,075,847 | 49,505,817
Common Stock, Dividends, Per Share, Cash Paid | $ 0.000 | $ 0.000 | $ 0.500

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