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Balance Sheet Components (Details) - USD ($) $ in Thousands	Apr. 02, 2017	Jan. 01, 2017
Inventories:
Work-in-process	$ 2,239	$ 1,538
Finished goods	622	479
Inventories	2,861	2,017
Other current assets:
Prepaid expenses	836	960
Other	141	163
Other current assets	977	1,123
Property and equipment:
Property and equipment, gross	15,050	14,897
Accumulated depreciation and amortization	(12,484)	(12,132)
Property and equipment, net	2,566	2,765
Accrued liabilities:
Employee related accruals	1,632	1,222
Other	384	358
Accrued liabilities	2,016	1,580
Equipment
Property and equipment:
Property and equipment, gross	11,552	11,524
Software
Property and equipment:
Property and equipment, gross	2,749	2,624
Furniture and fixtures
Property and equipment:
Property and equipment, gross	41	41
Leasehold improvements
Property and equipment:
Property and equipment, gross	$ 708	$ 708

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