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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2021
Related Party Transaction          
Accounts receivable due from related party $ 1,400   $ 1,400   $ 14,100
Corporate Joint Venture          
Related Party Transaction          
Revenue from related parties 1,100   1,500    
Accounts receivable due from related party 660   660   13,500
Corporate Joint Venture | Related Party Services          
Related Party Transaction          
Related party transaction expenses 867 $ 875 1,700 $ 1,500  
Corporate Joint Venture | Research and development          
Related Party Transaction          
Related party transaction expenses 90 74 188 299  
Corporate Joint Venture | Purchase of Inventory          
Related Party Transaction          
Related party transaction expenses 69 70 249 70  
Corporate Joint Venture | Consumption Tax          
Related Party Transaction          
Related party transaction expenses 77 37 219 37  
Corporate Joint Venture | Commitment For Services          
Related Party Transaction          
Related party transaction expenses 43 81 90 97  
Corporate Joint Venture | Other Income          
Related Party Transaction          
Gain on termination of JVA and settlement of obligation   1,500   1,500  
Yaskawa | Sale of Products          
Related Party Transaction          
Revenue from related parties 223 375 770 709  
Common Stockholder          
Related Party Transaction          
Accounts receivable due from related party         5
Common Stockholder | Sale of Products          
Related Party Transaction          
Revenue from related parties 77 308 856 506  
Common Stockholder | Service Fee Income          
Related Party Transaction          
Revenue from related parties 35   66    
Common Stockholder | License Maintenance Fee          
Related Party Transaction          
Reduction in license maintenance fees 38 38 75 75  
Common Stockholder | Interest Expense          
Related Party Transaction          
Related party transaction expenses 184 184 366 350  
Common Stockholder | License Fee Income          
Related Party Transaction          
Revenue from related parties   8,000   8,500  
Stockholder and Noteholder          
Related Party Transaction          
Accounts receivable due from related party 125   125   503
Noncontrolling Common Stockholder          
Related Party Transaction          
Accounts payable to related party 827   827   370
Accrued royalties         4
Noncontrolling Common Stockholder | Nexperia          
Related Party Transaction          
Accounts payable to related party $ 565   $ 565   $ 11
Noncontrolling Common Stockholder | Sale of Products          
Related Party Transaction          
Revenue from related parties   2   19  
Noncontrolling Common Stockholder | License Maintenance Fee          
Related Party Transaction          
Related party transaction expenses   61   111  
Noncontrolling Common Stockholder | Consulting Fee          
Related Party Transaction          
Related party transaction expenses   171   176  
GaNovation          
Related Party Transaction          
Revenue from related parties   $ 145   $ 154