Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of carrying value of intangible assets

The carrying values of intangible assets as of the dates presented, respectively, consists of the following (in thousands except years):

	March 31, 2022
	Gross		Accumulated Amortization		Foreign Exchange Rate Changes		Net		Estimated Useful Life (in years)
Patents	$	2,963	$	(2,346)	$	—	$	617	10
Developed technology - 150V	560		(517)		(43)		—		6
Developed technology - 600V	1,701		(1,570)		(131)		—		6
Total	$	5,224	$	(4,433)	$	(174)	$	617
	March 31, 2021
	Gross		Accumulated Amortization		Foreign Exchange Rate Changes		Net		Estimated Useful Life (in years)
Patents	$	2,963	$	(2,049)	$	—	$	914	10
Developed technology - 150V	560		(517)		(43)		—		6
Developed technology - 600V	1,701		(1,570)		(131)		—		6
Total	$	5,224	$	(4,136)	$	(174)	$	914

Schedule of estimated future amortization expenses related to intangible assets

Estimated future amortization expenses related to intangible assets as of March 31, 2022 were as follows (in thousands):

Year Ending March 31,
2023	$	296
2024	296
2025	25
Total	$	617