Balance Sheet Components (Details) - USD ($) $ in Thousands	Apr. 03, 2016	Jan. 03, 2016
Inventories:
Raw materials	$ 0	$ 0
Work-in-process	1,172	1,720
Finished goods	2,158	1,158
Inventories	3,330	2,878
Other current assets:
Prepaid expenses	1,076	1,184
Other	104	128
Other current assets	1,180	1,312
Property and equipment:
Property and equipment, gross	19,122	18,490
Accumulated depreciation and amortization	(15,486)	(15,175)
Property and equipment, net	3,636	3,315
Accrued liabilities:
Employee related accruals	1,575	1,237
Other	253	245
Accrued liabilities	1,828	1,482
Equipment
Property and equipment:
Property and equipment, gross	15,145	14,531
Software
Property and equipment:
Property and equipment, gross	3,133	3,114
Furniture and fixtures
Property and equipment:
Property and equipment, gross	130	131
Leasehold improvements
Property and equipment:
Property and equipment, gross	$ 714	$ 714