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5. Patents

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

5. PATENTS

Acacia’s only identifiable intangible assets are patents and patent rights, with estimated remaining economic useful lives ranging from one to five years. For all periods presented, all of Acacia’s identifiable intangible assets were subject to amortization. The gross carrying amounts and accumulated amortization related to investments in intangible assets as of December 31, 2020 and 2019 are as follows (in thousands):

	2020			2019
Gross carrying amount - patents	$	336,834		$	330,588
Accumulated amortization - patents⁽¹⁾		(319,922	)		(322,774	)
Patents, net	$	16,912		$	7,814

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⁽¹⁾ Includes patent impairment charges for the applicable periods.

The weighted-average remaining estimated economic useful life of Acacia’s patents and patent rights is 4 years. Scheduled annual aggregate amortization expense is estimated to $4,450,000 in 2021, $4,451,000 in 2022, $4,376,000 in 2023, $3,005,000 in 2024, and $630,000 thereafter.

Acacia did not record charges related to the impairment of patent-related intangible assets for the years ended December 31, 2020 and December 31, 2019.

There is no accelerated amortization or sales for patent-related assets for the years ended December 31, 2020 and December 31, 2019.