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Nexperia Arrangement (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 16, 2021
Apr. 04, 2018
Jun. 30, 2022
Jun. 30, 2022
Jun. 30, 2021
May 18, 2021
Mar. 01, 2021
Mar. 31, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                
License fees   $ 9,000,000            
Long-term loan facility   15,000,000            
Revenue from product and license fees       $ 5,156,000 $ 3,216,000      
Supply agreement renewal term       1 year        
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              
Tranche B Loan                
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                
Long-term loan facility         $ 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            
Tranche B-1 Loan                
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                
Long-term loan facility           $ 2,000,000   $ 2,000,000
Repayment of Nexperia debt $ 8,000,000              
Loan and Security Agreement (LSA)                
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                
Long-term loan facility   15,000,000            
Revolving loan   $ 10,000,000       $ 12,000,000 $ 10,000,000  
Interest rate per annum   6.00%            
Repayment of Nexperia debt     $ 5,000,000          
Revenue from product and license fees     $ 5,000,000          
Series 3 Preferred Stock                
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                
Issuance of preferred stock   $ 16,000,000