Income Taxes (Net Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012
Deferred tax assets:
Net operating losses	$ 38,594	$ 36,137
Capital losses	4,530	2,205
Accruals and reserves	2,848	2,683
Credits carryforward	5,433	5,024
Unrealized loss on marketable securities	0	3,088
Depreciation and amortization	10,590	9,558
Stock-based compensation	1,583	1,344
Other	0	273
Deferred tax assets, gross	63,578	60,312
Valuation allowances	(63,528)	(60,223)
Deferred tax asset	50	89
Deferred tax liability	$ 0	$ 0