Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands							1 Months Ended		12 Months Ended
	May 17, 2023	Apr. 04, 2023	Apr. 03, 2023	Dec. 07, 2021	Nov. 09, 2021	Aug. 13, 2021	Apr. 30, 2023	Apr. 30, 2021	Mar. 31, 2023	Mar. 31, 2022	Jun. 16, 2023	Jun. 02, 2022	Jan. 10, 2022	Nov. 05, 2021
Subsequent Event [Line Items]
Exercise price (in usd per share)													$ 3.30
Aggregate purchase price								$ 500
Number of shares sold in private placement offering (in shares)								97,099
Proceeds from exercise of warrants									$ 2,950	$ 272
Placement agent fees and closing expenses									$ 280	$ 1,127
Private Placement
Subsequent Event [Line Items]
Number of common stock issuable from warrants (in shares)				348,649	416,667	209,000						666,668		958,334
Exercise price (in usd per share)				$ 9.25	$ 6.00	$ 6.00						$ 6.00		$ 6.00
Aggregate purchase price				$ 12,900	$ 33,000	$ 5,000
Number of shares sold in private placement offering (in shares)				1,673,152	6,600,000	1,000,000
Price per share (in usd per share)				$ 7.71	$ 5.00	$ 5.00
Placement agent fees and closing expenses				$ 300	$ 800	$ 22
Subsequent Event
Subsequent Event [Line Items]
Proceeds from exercise of warrants							$ 7,300
Subscription rights offering											$ 15,000
Subsequent Event | National Security Technology Accelerator | GaN Epiwafer Materials
Subsequent Event [Line Items]
Collaborative arrangement, counterparty funding commitment, maximum	$ 15,200
Cooperative and development activities	7,500
Collaborative arrangement, counterparty future funding commitment, maximum	$ 7,700
Subsequent Event | Tranche C Loan
Subsequent Event [Line Items]
Repayment of loan		$ 12,200
Accrued interest on promissory note		12,000
Interest expense accrued		$ 200
Subsequent Event | Private Placement
Subsequent Event [Line Items]
Number of common stock issuable from warrants (in shares)			250,001
Exercise price (in usd per share)			$ 5.00
Aggregate purchase price			$ 2,000
Number of shares sold in private placement offering (in shares)			500,000
Price per share (in usd per share)			$ 4.00
Subsequent Event | Existing Warrant Shares
Subsequent Event [Line Items]
Number of common stock issuable from warrants (in shares)			1,815,848
Exercise price (in usd per share)			$ 4.00
Proceeds from exercise of warrants			$ 9,300
Placement agent fees and closing expenses			$ 400
Subsequent Event | Inducement Warrants
Subsequent Event [Line Items]
Number of common stock issuable from warrants (in shares)			2,269,810
Exercise price (in usd per share)			$ 5.00