Balance Sheet Components (Details) - USD ($) $ in Thousands	Oct. 02, 2016	Jan. 03, 2016
Inventories:
Raw materials	$ 0	$ 0
Work-in-process	997	1,720
Finished goods	446	1,158
Inventories	1,443	2,878
Other current assets:
Prepaid expenses	916	1,184
Other	165	128
Other current assets	1,081	1,312
Property and equipment:
Property and equipment, gross	14,849	18,490
Accumulated depreciation and amortization	(11,776)	(15,175)
Property and equipment, net	3,073	3,315
Accrued liabilities:
Employee related accruals	1,749	1,237
Other	326	245
Accrued liabilities	2,075	1,482
Equipment
Property and equipment:
Property and equipment, gross	11,488	14,531
Software
Property and equipment:
Property and equipment, gross	2,612	3,114
Furniture and fixtures
Property and equipment:
Property and equipment, gross	41	131
Leasehold improvements
Property and equipment:
Property and equipment, gross	$ 708	$ 714