Balance Sheet Components (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Jan. 01, 2017
Inventories:
Work-in-process	$ 2,354	$ 1,538
Finished goods	968	479
Inventories	3,322	2,017
Other current assets:
Prepaid expenses	743	960
Other	125	163
Other current assets	868	1,123
Property and equipment:
Property and equipment, gross	15,127	14,897
Accumulated depreciation and amortization	(12,598)	(12,132)
Property and equipment, net	2,529	2,765
Accrued liabilities:
Employee related accruals	1,252	1,222
Other	396	358
Accrued liabilities	1,648	1,580
Equipment
Property and equipment:
Property and equipment, gross	11,602	11,524
Software
Property and equipment:
Property and equipment, gross	708	2,624
Furniture and fixtures
Property and equipment:
Property and equipment, gross	45	41
Leasehold improvements
Property and equipment:
Property and equipment, gross	$ 2,772	$ 708