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Related Parties - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Lite On Semiconductor      
Related Party Transaction [Line Items]      
Related Party ownership of common stock 15.00%    
Related Party Transaction, Description of Transaction LSC is our largest stockholder, owning approximately 15% of our outstanding Common Stock as of March 31, 2020, and is a member of the Lite-On Group of companies.    
Cash payments to acquire business     $ 437.0
Keylink      
Related Party Transaction [Line Items]      
Related Party ownership of common stock 5.00%    
Related Party Transaction, Description of Transaction Keylink is our 5% joint venture partner in our Shanghai assembly and test facilities.    
Related Party Transaction Consulting Fees from Transactions with Related Party $ 3.1 $ 3.9  
Chengdu Ya Guang Electronic Company Limited ("Ya Guang")      
Related Party Transaction [Line Items]      
Related Party Transaction, Description of Transaction In addition, Chengdu Ya Guang Electronic Company Limited (“Ya Guang”) is our 2% joint venture partner in one of our Chengdu assembly and test facilities and is our 5% joint venture partner in our other Chengdu assembly and test facility    
Chengdu Ya Guang Electronic Company Limited ("Ya Guang") | Chengdu | Assembly and Test Facility One      
Related Party Transaction [Line Items]      
Related Party ownership of common stock 2.00%    
Chengdu Ya Guang Electronic Company Limited ("Ya Guang") | Chengdu | Assembly and Test Facility Two      
Related Party Transaction [Line Items]      
Related Party ownership of common stock 5.00%