Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued expenses and reserves	$ 3,096	$ 5,143
Inventory	2	290
Deferred Revenue	228	426
Stock-based and deferred compensation	4,018	7,269
Intangible assets	19,576	20,063
Fixed assets	216	678
Net operating loss carry forwards	86,410	137,521
Tax credit carry forwards	90,530	89,174
Capital loss carry forwards	3,926	962
Other	2,323	2,973
Gross deferred tax assets	210,325	264,499
Less: valuation allowance	(209,691)	(260,687)
Net deferred tax assets	634	3,812
Deferred tax liabilities:
Fixed Assets	559	0
Other	16	3,746
Total deferred tax liabilities	575	3,746
Net deferred tax assets	$ 59	$ 66