Income Taxes (Discussion of Valuation Allowance and Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 03, 2015	Dec. 31, 2016	Jan. 02, 2016
Valuation Allowance [Line Items]
Resulting tax benefit from realization of the benefit of a portion of remaining deferred tax assets	$ 11,500
Resulting net deferred tax asset			$ 21,300
Increase in valuation allowance		$ 7,500	21,000
Deferred tax assets:
Accrued expenses and reserves		5,143	5,690
Inventory		290	303
Deferred Revenue		426	3,177
Stock-based and deferred compensation		7,269	7,674
Intangible assets		20,063	16,959
Fixed assets		678	0
Net operating loss carry forwards		137,521	131,829
Tax credit carry forwards		89,174	87,909
Capital loss carry forwards		962	1,262
Other		2,975	2,458
Gross deferred tax assets		264,501	257,261
Less: valuation allowance		(260,687)	(252,578)
Net deferred tax assets		3,814	4,683
Deferred tax liabilities
Fixed Assets		0	791
Other		3,746	3,734
Total deferred tax liabilities		3,746	4,525
Net deferred tax assets		68	$ 158
Do not expire
Valuation Allowance [Line Items]
Tax credit carryforwards		55,500
Federal
Valuation Allowance [Line Items]
Operating loss carryforwards		367,000
Tax credit carryforwards		49,200
State
Valuation Allowance [Line Items]
Operating loss carryforwards		193,300
Tax credit carryforwards		$ 56,700