Restructuring Costs - Schedule of Costs Recorded in Accrued Liabilities (Details) - KFAB Wafer Manufacturing Operations $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	$ 2,827
Early Supply Contract Termination
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	2,231
Retention Costs | Cost of Goods Sold
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	490
Retention Costs | Selling, General and Administrative
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	91
Retention Costs | Research and Development
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	$ 15