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PATENTS, NET OF ACCUMULATED AMORTIZATION | 6 Months Ended
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Jun. 30, 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 June 30, 2021 and December 31, 2020 are patents and patent rights. Patent-related accumulated amortization totaled $288,964,000 and $319,922,000 as of June 30, 2021 and December 31, 2020, respectively. Acacia’s patents have remaining estimated economic useful lives ranging from twenty-nine to fifty-five 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 June 30, 2021:
Schedule of intangible assets |  |  |  |
For the years ending December 31, |  |  |
(In thousands) |  |
Remainder of 2021 |  | $ | 5,224 |
2022 |  |  | 10,448 |
2023 |  |  | 10,381 |
2024 |  |  | 9,005 |
2025 |  |  | 6,630 |
Thereafter |  |  | 750 |
Patents, net |  | $ | 42,438 |
For the six months ended June 30, 2021, Acacia accrued patent and patent rights acquisition costs totaling $15.0 million, of which $10.0 million is due December 1, 2021 and $5.0 million is due February 18, 2023. Such amounts are included in Accrued patent investment costs and Other long-term liabilities in the accompanying consolidated balance sheet as of June 30, 2021, 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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