4. PATENTS

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

4. PATENTS

4. PATENTS

Acacia’s only identifiable intangible assets at September 30, 2020 and December 31, 2019 are patents and patent rights. Patent-related accumulated amortization totaled $326,296,000 and $322,774,000 as of September 30, 2020 and December 31, 2019, respectively. Acacia’s patents have remaining estimated economic useful lives ranging from three 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 September 30, 2020:

For the years ending December 31,
(In thousands)
Remainder of 2020	$	1,158
2021		4,451
2022		4,451
2023		4,376
2024		3,005
Thereafter		630
Patents, net	$	18,071