Balance Sheet Components (Details) - USD ($) $ in Thousands	Jul. 03, 2016	Jan. 03, 2016
Inventories:
Raw materials	$ 0	$ 0
Work-in-process	989	1,720
Finished goods	1,329	1,158
Inventories	2,318	2,878
Other current assets:
Prepaid expenses	864	1,184
Other	119	128
Other current assets	983	1,312
Property and equipment:
Property and equipment, gross	18,194	18,490
Accumulated depreciation and amortization	(15,104)	(15,175)
Property and equipment, net	3,090	3,315
Accrued liabilities:
Employee related accruals	1,134	1,237
Other	300	245
Accrued liabilities	1,434	1,482
Equipment
Property and equipment:
Property and equipment, gross	14,189	14,531
Software
Property and equipment:
Property and equipment, gross	3,162	3,114
Furniture and fixtures
Property and equipment:
Property and equipment, gross	129	131
Leasehold improvements
Property and equipment:
Property and equipment, gross	$ 714	$ 714