Balance Sheet Components (Details) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Jan. 01, 2012
Inventories:
Raw materials	$ 32	$ 52
Work-in-process	2,599	3,261
Finished goods	397	451
Inventories	3,028	3,764
Other current assets:
Prepaid expenses	954	575
Other	32	38
Other current assets	986	613
Other assets	186	211
Accrued liabilities:
Employee related accruals	1,035	845
Other	179	273
Accrued liabilities	$ 1,214	$ 1,118