	December 31, 2024			December 31, 2023
Trademarks	$	4,739		$	4,739
Indefinite-lived intangible assets		120			120
Customer relationships		6,023			6,023
		10,882			10,882
Accumulated amortization		(10,762	)		(10,762	)

Intangible assets, net	$	120		$	120

Trademarks are amortized over periods ranging from 3 to 30 years, customer relationships are amortized over periods ranging from 15 to 16 years, and other intangible assets are amortized over 3 years. Amortization expense was $0 and $0 for 2024 and 2023, respectively. All intangible assets have been fully amortized as of December 31, 2024.

During the fourth quarter of fiscal 2022 we recorded an aggregate impairment loss of the remaining definitive-lived intangible assets related to NSL customer relationships. Therefore, we recorded no loss of intangible assets related to NSL customer relationships in 2024.

Due to the nature and size of our remaining assets, annual impairment testing was not performed in 2023 or 2024 nor was an impairment loss recognized.