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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Disaggregation of Revenue [Table Text Block] | Revenues were comprised of the following for the periods presented (in thousands):
| 2018 |  | 2017
Paid-up Revenue Agreements | $ | 100,496 |  |  | $ | 59,020 |
Recurring Revenue Agreements | 13,040 |  |  | 6,382 |
Other Settlements | 3,470 |  |  | — |
Sales | 14,500 |  |  | — |
| $ | 131,506 |  |  | $ | 65,402 |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] | Financial assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):
| Level 1 |  | Level 2 |  | Level 3
Assets as of December 31, 2018: |  |  |  |  |
Trading securities - debt | $ | — |  |  | $ | 33,642 |  |  | $ | — |
Trading securities - equity | 3,012 |  |  | — |  |  | — |
Investment at fair value - warrants (Note 6) | — |  |  | 2,064 |  |  | — |
Investment at fair value - common stock (Note 6) | 5,395 |  |  | — |  |  | — |
Total recurring fair value measurements as of December 31, 2018 | $ | 8,407 |  |  | $ | 35,706 |  |  | $ | — |
Assets as of December 31, 2017: |  |  |  |  |
Investments at fair value (Note 6) | $ | — |  |  | $ | — |  |  | $ | 104,754 |
Liabilities as of December 31, 2018: |  |  |  |  |
Profits interest units | $ | — |  |  | $ | 591 |  |  | $ | — |
Liabilities as of December 31, 2017: |  |  |  |  |
Profits interest units | $ | — |  |  | $ | — |  |  | $ | 3,041 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair values of stock options granted during the periods presented were estimated using the Black-Scholes option-pricing model, based on the following weighted-average assumptions:
| For the Years Ended
| December 31, 2018 |  | December 31, 2017
Risk-free interest rate | 2.26% |  | 1.77%
Term | 4.37 |  | 4.37
Volatility | 51% |  | 51%
Dividend yield | —% |  | —%
Property and Equipment, Useful Lives | Depreciation and amortization is computed on a straight-line basis over the following estimated useful lives of the assets:
Furniture and fixtures | 3 to 5 years
Computer hardware and software | 3 to 5 years
Leasehold improvements | 2 to 5 years (Lesser of lease term or useful life of improvement)
Schedule of Earnings Per Share, Basic and Diluted | The following table presents the weighted-average number of common shares outstanding used in the calculation of basic and diluted income per share:
|  | 2018 |  | 2017
Numerator (in thousands): |  |  |  |
Basic and Diluted |  |  |  |
Net income (loss) attributable to Acacia Research Corporation |  | $ | (105,029 | ) |  | $ | 22,180 |
Undistributed earnings allocated to participating securities |  | — |  |  | (33 | )
Net income (loss) attributable to common stockholders – basic and diluted |  | $ | (105,029 | ) |  | $ | 22,147 |
Denominator: |  |  |  |
Weighted-average shares used in computing net loss per share attributable to common stockholders – basic |  | 49,969,062 |  |  | 50,495,119 |
Effect of potentially dilutive securities: |  |  |  |
Common stock options and restricted stock units |  | — |  |  | 196,893 |
Weighted-average shares used in computing net income (loss) per share attributable to common stockholders – diluted |  | 49,969,062 |  |  | 50,692,012 |
Basic and diluted net loss per common share |  | $ | (2.10 | ) |  | $ | 0.44 |
Anti-dilutive equity-based incentive awards excluded from the computation of diluted loss per share |  | 3,129,719 |  |  | 4,425,187 |

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