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Investment in Aizu Fujitsu Semiconductor Wafer Solution Limited ("AFSW") - Narrative (Details)
$ in Thousands, ¥ in Millions
3 Months Ended 12 Months Ended
May 23, 2017
USD ($)
May 23, 2017
JPY (¥)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Apr. 01, 2020
Variable Interest Entity [Line Items]              
Investment in joint venture $ 9 ¥ 1 $ 1,548 $ 189 $ 2,698 $ 1,852  
Unfunded commitment     1,300        
Put and call rights term         180 days    
Subsequent Event              
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 1,852  
Unfunded commitment     $ 1,500   $ 1,700 $ 659  
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%