Orion has $0.9 million of goodwill related to its purchase of Voltrek in the third quarter of fiscal 2023, which has an indefinite life, and is assigned to the EV Charging operating segment.

Orion has $0.6 million of goodwill related to its purchase of Stay-Light Lighting during fiscal year 2022, which has an indefinite life, and is assigned to the Maintenance operating segment.

As of September 30, 2023 and March 31, 2023, the components of, and changes in, the carrying amount of other intangible assets, net, were as follows (dollars in thousands):


	September 30, 2023									March 31, 2023
	Gross Carrying Amount		Accumulated Amortization			Net		Weighted Average Useful Life		Gross Carrying Amount		Accumulated Amortization			Net
Amortized Intangible Assets
Patents	$	2,521	$	(1,981	)	$	540		8.4	$	2,521	$	(1,930	)	$	591
Licenses		58		(58	)		—		—		58		(58	)		—
Trade name and trademarks		464		(117	)		347		3.8		464		(73	)		391
Customer relationships		5,509		(4,174	)		1,335		3.3		5,509		(3,914	)		1,595
Vendor relationships		2,600		(368	)		2,232		6.0		2,600		(183	)		2,417
Developed technology		900		(900	)		—		—		900		(900	)		—
Total Amortized Intangible Assets	$	12,052	$	(7,598	)	$	4,454		5.3	$	12,052	$	(7,058	)	$	4,994

Indefinite-lived Intangible Assets
Trade name and trademarks	$	1,010	$	—		$	1,010			$	1,010	$	—		$	1,010
Total Non-Amortized Intangible Assets	$	1,010	$	—		$	1,010			$	1,010	$	—		$	1,010

Amortization expense on intangible assets was $0.2 million and $0.5 million for the three and six months ended September 30, 2023, respectively.

Amortization expense on intangible assets was $0.1 million for the three and six months ended September 30, 2022, respectively.