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Related Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Related Party Transaction      
Accounts receivable due from related party $ 16,800   $ 14,100
Deferred revenue 1,016   505
Corporate Joint Venture      
Related Party Transaction      
Accounts receivable due from related party 15,600   13,500
Corporate Joint Venture | Related Party Services      
Related Party Transaction      
Related party transaction expenses 641 $ 56  
Corporate Joint Venture | Research and development      
Related Party Transaction      
Related party transaction expenses 224 408  
Corporate Joint Venture | Commitment For Services      
Related Party Transaction      
Related party transaction expenses (16) 15  
Corporate Joint Venture | Reimbursement for research and development      
Related Party Transaction      
Related party transaction expenses   231  
Noncontrolling Common Stockholder      
Related Party Transaction      
Accounts receivable due from related party 5   5
Accounts payable to related party 763   370
Accrued Royalties, Related Party     4
Noncontrolling Common Stockholder | Nexperia      
Related Party Transaction      
Accounts payable to related party 42   11
Noncontrolling Common Stockholder | Sale of Products      
Related Party Transaction      
Revenue from related parties 18 27  
Noncontrolling Common Stockholder | License Maintenance Fee      
Related Party Transaction      
Related party transaction expenses 50 50  
Common Stockholder      
Related Party Transaction      
Accounts receivable due from related party 490   $ 503
Common Stockholder | Sale of Products      
Related Party Transaction      
Revenue from related parties 197 359  
Common Stockholder | License Maintenance Fee      
Related Party Transaction      
Reduction in license maintenance fees 38 38  
Common Stockholder | License Fee Income      
Related Party Transaction      
Revenue from related parties 476 5,100  
Common Stockholder | Interest Expense      
Related Party Transaction      
Related party transaction expenses 166 151  
Common Stockholder | Reimbursement for research and development      
Related Party Transaction      
Revenue from related parties   $ 231  
Yaskawa      
Related Party Transaction      
Accounts receivable due from related party 750    
Deferred revenue 750    
Yaskawa | Cooperation And Development Agreement      
Related Party Transaction      
Revenue from related parties $ 334