Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified	Dec. 29, 2013	Dec. 30, 2012
Inventories:
Raw materials	$ 19	$ 32
Work-in-process	1,343	2,599
Finished goods	2,774	397
Inventories	4,136	3,028
Other current assets:
Prepaid expenses	845	954
Other	427	32
Other current assets	1,272	986
Accrued liabilities:
Employee related accruals	2,821	1,035
Other	698	179
Accrued liabilities	$ 3,519	$ 1,214