Restructuring Costs - Schedule of Costs Accrued Related to Restructuring (Details) - KFAB Wafer Manufacturing Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Beginning balance, January 1, 2017	$ 1,304
Costs accrued	512	$ 8,734
Restructuring costs paid	(1,816)	(7,430)
Balance at December 31, 2017		1,304
Early Contract Termination
Restructuring Cost And Reserve [Line Items]
Costs accrued		1,985
Restructuring costs paid		(1,985)
Retention Costs
Restructuring Cost And Reserve [Line Items]
Beginning balance, January 1, 2017	659
Costs accrued	(14)	3,158
Restructuring costs paid	(645)	(2,499)
Balance at December 31, 2017		659
Equipment Relocation, Shutdown Cost and Other
Restructuring Cost And Reserve [Line Items]
Beginning balance, January 1, 2017	645
Costs accrued	526	3,591
Restructuring costs paid	$ (1,171)	(2,946)
Balance at December 31, 2017		$ 645