Related Parties - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Lite On Semiconductor
Related Party Transaction [Line Items]
Related Party ownership of common stock	15.00%		15.00%
Related Party Transaction, Description of Transaction			LSC is our largest stockholder, owning approximately 15% of our outstanding Common Stock as of September 30, 2019, and is a member of the Lite-On Group of companies.
Keylink
Related Party Transaction [Line Items]
Related Party ownership of common stock	5.00%		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	$ 3.7	$ 3.8	$ 11.5	$ 12.6
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%		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%		5.00%