Restructuring Costs - Schedule of Costs Accrued Related to Restructuring (Details) - KFAB Wafer Manufacturing Operations - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Restructuring Cost And Reserve [Line Items]
Costs accrued	$ 1,838	$ 4,069
Restructuring costs paid		(1,572)
Ending balance, June 30, 2017	2,497	2,497
Early Contract Termination
Restructuring Cost And Reserve [Line Items]
Costs accrued	(246)	1,985
Restructuring costs paid		(1,500)
Ending balance, June 30, 2017	485	485
Retention Costs
Restructuring Cost And Reserve [Line Items]
Costs accrued	1,778	1,778
Ending balance, June 30, 2017	1,778	1,778
Equipment Relocation
Restructuring Cost And Reserve [Line Items]
Costs accrued	72	72
Restructuring costs paid		(72)
Asset Retirement Obligation Amortization
Restructuring Cost And Reserve [Line Items]
Costs accrued		234
Ending balance, June 30, 2017	$ 234	$ 234