Restructuring Costs - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Feb. 28, 2017
Restructuring Cost And Reserve [Line Items]
Assets impairement related to KFAB shut-down	$ 1,993		$ 1,993
KFAB Wafer Manufacturing Operations
Restructuring Cost And Reserve [Line Items]
Restructuring activities description			In February 2017, the Company announced its plan to transfer its wafer fabrication operation at KFAB to other Company-owned wafer fabrication plants and external foundries. The Company ceased production operations at KFAB late in third quarter 2017 and plans to vacate the premises no later than November 15, 2017.
Proceeds from insurance settlement		$ 6,000
Assets impairement related to KFAB shut-down	2,000
Additional asset retirement obligations related to restructuring			$ 1,403
Restructuring costs relating to KFAB shutdown			5,173
KFAB Wafer Manufacturing Operations | Asset Retirement Obligation Amortization
Restructuring Cost And Reserve [Line Items]
Restructuring costs relating to KFAB shutdown	$ 700		900
KFAB Wafer Manufacturing Operations | Property, Plant and Equipment
Restructuring Cost And Reserve [Line Items]
Asset retirement obligation			$ 400
KFAB Wafer Manufacturing Operations | Minimum
Restructuring Cost And Reserve [Line Items]
Expected shutdown costs				$ 10,000
KFAB Wafer Manufacturing Operations | Maximum
Restructuring Cost And Reserve [Line Items]
Expected shutdown costs				$ 12,000
KFAB Wafer Manufacturing Operations | Cost of Goods Sold
Restructuring Cost And Reserve [Line Items]
Proceeds from insurance settlement		4,200
KFAB Wafer Manufacturing Operations | Other Income
Restructuring Cost And Reserve [Line Items]
Proceeds from insurance settlement		$ 1,800