Balance Sheet Components (Tables)

6 Months Ended

Sep. 30, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Inventory

Inventory consists of the following as of the dates presented (in thousands):

	September 30, 2023		March 31, 2023
Raw materials	$	4,959	$	5,167
Work in process	2,343		1,719
Sub-assembly	1,509		809
Finished goods	965		711
Total	$	9,776	$	8,406

Schedule of Property and Equipment

Property and equipment, net consist of the following as of the dates presented (in thousands):

	September 30, 2023		March 31, 2023
Machinery and equipment	$	14,079	$	11,124
Computer equipment and software	883		887
Furniture and fixtures	70		75
Leasehold improvements	5,095		5,069
Construction in progress	3,506		6,446
Property and equipment, gross	23,633		23,601
Less: accumulated depreciation	(15,776)		(15,711)
Property and equipment, net	$	7,857	$	7,890

Schedule of Carrying Value of Intangible Assets

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

	September 30, 2023
	Gross		Accumulated Amortization		Foreign Exchange Rate Changes		Net		Estimated Useful Life (in years)
Patents	$	2,963	$	(2,790)	$	—	$	173	10
Developed Technology - 150 V	560		(517)		(43)		—		6
Developed Technology - 600 V	1,701		(1,570)		(131)		—		6
Total	$	5,224	$	(4,877)	$	(174)	$	173

	March 31, 2023
	Gross		Accumulated Amortization		Foreign Exchange Rate Changes		Net		Estimated Useful Life (in years)
Patents	$	2,963	$	(2,642)	$	—	$	321	10
Developed Technology - 150 V	560		(517)		(43)		—		6
Developed Technology - 600 V	1,701		(1,570)		(131)		—		6
Total	$	5,224	$	(4,729)	$	(174)	$	321

Schedule of Estimated Future Amortization Expenses Related to Intangible Assets

Estimated future amortization expenses related to intangible assets as of September 30, 2023 were as follows (in thousands):

Year Ending March 31,
2024	$	148
2025	25
Total	$	173

Schedule of Goodwill

Changes in the carrying amount of goodwill were as follows (in thousands):

Balance as of March 31, 2022	$	1,180
Foreign currency translation adjustments	(101)
Balance as of March 31, 2023	$	1,079
Foreign currency translation adjustments	(116)
Balance as of September 30, 2023	$	963

Schedule of Accrued Expenses

Accounts payable and accrued expenses consist of the following as of the dates presented (in thousands):

	September 30, 2023		March 31, 2023
Accounts payable	$	4,044	$	2,781
Manufacturing production costs	811		506
Legal fees	305		596
Audit fees	12		318
Consulting fees	176		256
Insurance	64		—
Deposit liability	—		2,950
Other	786		488
Accrued expenses	$	2,154	$	5,114
Total Accounts payable and accrued expenses	$	6,198	$	7,895