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Commitments and Contingencies - Restructuring Activities and Sale of Guangzhou Factory (Details) $ in Thousands, ¥ in Millions		12 Months Ended
	Jun. 26, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Apr. 26, 2018 USD ($)	Apr. 26, 2018 CNY (¥)	Apr. 23, 2018 USD ($)	Apr. 23, 2018 CNY (¥)	Sep. 26, 2016 CNY (¥)
Restructuring Cost and Reserve [Line Items]
Factory transition restructuring charges		$ 0	$ 6,145	$ 4,493
Nonrefundable deposit					$ 5,100	¥ 34
Consideration receivable upon government approvals					35,800	237
Escrow deposit					$ 10,300	¥ 68
Gain on sale of Guangzhou factory	$ 37,000	$ 36,978	$ 0	0
Net gain on disposal	$ 32,100
Guangzhou Factory | Disposed of by Sale
Restructuring Cost and Reserve [Line Items]
Consideration received in sale							$ 51,400	¥ 339	¥ 320
Escrow deposit as percentage of purchase price			10.00%
Employee Severance | Manufacturing Activities Transition | Operating Expense
Restructuring Cost and Reserve [Line Items]
Factory transition restructuring charges			$ 6,100	$ 4,500

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