Restructuring Costs - Schedule of Costs Accrued Related to Restructuring (Details) - KFAB Wafer Manufacturing Operations $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Costs accrued	$ 5,173
Restructuring costs paid	(2,500)
Balance at September 30, 2017	2,673
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]
Costs accrued	2,687
Restructuring costs paid	(14)
Balance at September 30, 2017	2,673
Equipment Relocation
Restructuring Cost And Reserve [Line Items]
Costs accrued	501
Restructuring costs paid	$ (501)