4. Patents

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Patents

4. PATENTS

Acacia’s only identifiable intangible assets at March 31, 2020 and December 31, 2019 are patents and patent rights. Patent-related accumulated amortization totaled $323,817,000 and $322,774,000 as of March 31, 2020 and December 31, 2019, respectively. Acacia’s patents have remaining estimated economic useful lives ranging from three to fifty-nine 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, 2020:

For the years ending December 31,
(In thousands)
Remainder of 2020	$	2,571
2021		2,851
2022		2,851
2023		2,776
2024		1,405
Thereafter		96
	$	12,550