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Investment in Aizu Fujitsu Semiconductor Wafer Solution Limited ("AFSW") - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Apr. 01, 2020
Variable Interest Entity [Line Items]        
Unfunded commitment $ 1,300      
Aizu Fajitsu Semiconductor Wafer Solution Limited        
Variable Interest Entity [Line Items]        
Ownership percentage in entity 49.00%      
Additional financial support provided to investment $ 1,548 $ 2,698 $ 2,700  
Unfunded commitment $ 1,500   $ 1,700  
Fujitsu Semiconductor Limited | Aizu Fajitsu Semiconductor Wafer Solution Limited        
Variable Interest Entity [Line Items]        
Ownership percentage in entity 51.00%      
Fujitsu Semiconductor Limited | Aizu Fajitsu Semiconductor Wafer Solution Limited | Subsequent Event        
Variable Interest Entity [Line Items]        
Purchase of additional interest       51.00%