Restructuring Costs - Schedule of Asset Retirement Obligation Related to Restructuring (Details) - KFAB Wafer Manufacturing Operations $ in Thousands	6 Months Ended
Jun. 30, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Asset retirement obligation, beginning of period	$ 486
Accrual of additional asset retirement obligation	1,403
Asset retirement obligation, end of period	$ 1,889

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Name:	us-gaap_AssetRetirementObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant