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Nexperia Arrangement (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 16, 2021
Apr. 04, 2018
Jun. 30, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
May 18, 2021
Mar. 31, 2021
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       $ 3,670,000 $ 11,303,000 $ 8,826,000 $ 14,519,000      
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 C Loan                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Revolving loan   10,000,000                
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 (in percent)   6.00%                
Repayment of Nexperia debt     $ 5,000,000              
Revenue from product and license fees     $ 5,000,000              
Tranche B-1 Loan                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Long-term loan facility                 $ 2,000,000  
Repayment of Nexperia debt $ 8,000,000                  
Tranche B Loan                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Long-term loan facility               $ 8,000,000    
Series 3 Preferred Stock                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Issuance of preferred stock   $ 16,000,000