Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Deferred tax assets:
Accrued expenses and reserves	$ 4,137	$ 3,714
Inventory	0	2
Deferred Revenue	0	0
Stock-based and deferred compensation	2,812	2,660
Interest expense disallowance	0	1,283
Intangible assets	12,294	14,649
Fixed assets	256	281
Net operating loss carry forwards	86,899	88,333
Tax credit carry forwards	90,339	92,208
Capital loss carry forwards	4,235	5,007
Other	1,059	1,130
Total deferred tax assets	202,031	209,267
Less: valuation allowance	(198,499)	(207,108)
Net deferred tax assets	3,532	2,159
Deferred tax liabilities:
Fixed assets	2,620	1,536
Deferred revenue	434	525
Other	0	(57)
Total deferred tax liabilities	3,054	2,004
Net deferred tax assets	$ 478	$ 155