Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Deferred tax assets:
Accrued expenses and reserves	$ 3,714	$ 3,096
Inventory	2	2
Deferred Revenue	0	228
Stock-based and deferred compensation	2,660	4,018
Interest expense disallowance	1,283	0
Intangible assets	14,649	19,576
Fixed assets	281	216
Net operating loss carry forwards	88,333	86,410
Tax credit carry forwards	92,208	90,530
Capital loss carry forwards	5,007	3,926
Other	1,130	2,323
Total deferred tax assets	209,267	210,325
Less: valuation allowance	(207,108)	(209,691)
Net deferred tax assets	2,159	634
Deferred tax liabilities:
Fixed assets	1,536	559
Deferred revenue	525	0
Other	(57)	16
Total deferred tax liabilities	2,004	575
Net deferred tax assets	$ 155	$ 59