Nexperia Arrangement (Details) - USD ($)				1 Months Ended						2 Months Ended	3 Months Ended	12 Months Ended
	Jul. 16, 2021	Jun. 29, 2020	Apr. 04, 2018	Jun. 30, 2020	Dec. 31, 2019	Oct. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2019	Mar. 31, 2021	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2021	May 18, 2021	May 17, 2021	Mar. 01, 2021	Mar. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
License fees			$ 9,000,000	$ 5,000,000		$ 3,000,000	$ 3,000,000		$ 3,000,000					$ 9,000,000
Reduction of debt											$ 0	$ 0	$ 50,000
Supply agreement renewal term												1 year
Revenue from product and license fees											2,425,000	$ 24,050,000	11,371,000
Nexperia
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Term after notification of epiwafer qualification of a second source												2 years
License and Service
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from product and license fees	$ 8,000,000										$ 0	$ 8,000,000	$ 5,000,000
Tranche A Loan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Long-term loan facility			5,000,000
Reduction of debt				$ 5,000,000
Proceeds from issuance of debt								$ 5,000,000
Repayment of Nexperia debt		$ 5,000,000
Tranche B Loan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Long-term loan facility			10,000,000							$ 8,000,000						$ 8,000,000			$ 8,000,000	$ 8,000,000
Proceeds from issuance of debt										$ 8,000,000
Repayment of Nexperia debt	8,000,000
Tranche C Loan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revolving loan			10,000,000																10,000,000
Proceeds from issuance of debt															$ 10,000,000
Tranche B-1 Loan
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Long-term loan facility					$ 2,000,000									$ 2,000,000			$ 2,000,000	$ 2,000,000	2,000,000	$ 2,000,000
Proceeds from issuance of debt					$ 2,000,000
Repayment of Nexperia debt	$ 8,000,000
Tranche B and Tranche B-1 loans
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Long-term loan facility																			$ 10,000,000
Series 3 Preferred Stock
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Issuance of preferred stock			$ 16,000,000