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Investment in Aizu Fujitsu Semiconductor Wafer Solution Limited ("AFSW") - Narrative (Details) - USD ($)
9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]      
Unfunded commitment   $ 1,400,000  
Forecast      
Variable Interest Entity [Line Items]      
Expected exercise price under certain conditions $ 1    
Minimum number of days before closing 60 days    
Estimated Time Of Regulatory Approval, Minimum 3 years    
Estimated Time Of Regulatory Approval, Maximum 6 months    
Forecast | Subsequent Event      
Variable Interest Entity [Line Items]      
Agreement To Maintain And Continue AFSW, Term 1 year    
Aizu Fajitsu Semiconductor Wafer Solution Limited      
Variable Interest Entity [Line Items]      
Ownership percentage in entity   49.00%  
Additional financial support provided to investment   $ 5,327,000 $ 2,698,000
Unfunded commitment   $ 1,700,000 $ 1,700,000
Fujitsu Semiconductor Limited | Forecast      
Variable Interest Entity [Line Items]      
Purchase of additional interest 51.00%    
Fujitsu Semiconductor Limited | Aizu Fajitsu Semiconductor Wafer Solution Limited      
Variable Interest Entity [Line Items]      
Ownership percentage in entity   51.00%