Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jul. 31, 2016	Dec. 31, 2016	Jan. 02, 2016	Sep. 30, 2016
Income Tax Disclosure [Line Items]
Effective income tax rate		(41.00%)	(22.00%)
Income before income taxes		$ (6,503)	$ (19,545)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		$ (7,000)	(3,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount			$ 2,600
Unrecognized tax benefits		15,000		$ 15,500
Income tax provision upon recognition of unrecognized tax benefit		13,300
Unrecognized tax benefits that would impact valuation allowance		5,000
Potentail reduction in unrecognized tax benefits and accrued interest over next 12 months		$ (7,000)
Korea (South), Won
Income Tax Disclosure [Line Items]
Income tax examination, estimate of possible loss	$ 12,000