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4. PATENTS, NET OF ACCUMULATED AMORTIZATION | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
PATENTS, NET OF ACCUMULATED AMORTIZATION | 4. PATENTS, NET OF ACCUMULATED AMORTIZATION Acacia’s only identifiable intangible assets at March 31, 2021 and December 31, 2020 are patents and patent rights. Patent-related accumulated amortization totaled $321,784,000 and $319,922,000 as of March 31, 2021 and December 31, 2020, respectively. Acacia’s patents have remaining estimated economic useful lives ranging from thirty-two to fifty-eight months. The weighted-average remaining estimated economic useful life of Acacia’s patents is approximately four years. The following table presents the scheduled annual aggregate amortization expense as of March 31, 2021:
For the years ending December 31, |  |  |  |
(In thousands) |  |  |  |  |
Remainder of 2021 |  |  | $ | 7,836 |
2022 |  |  |  | 10,448 |
2023 |  |  |  | 10,381 |
2024 |  |  |  | 9,005 |
2025 |  |  |  | 6,630 |
Thereafter |  |  |  | 750 |
|  |  | $ | 45,050 |
For the three months ended March 31, 2021, Acacia accrued patent and patent rights acquisition costs totaling $15 million, of which $10 million is due December 1, 2021, and $5 million is due February 18, 2023. They are included in Accrued patent investment costs and Other long-term liabilities in the accompanying consolidated balance sheets, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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