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Balance Sheet Components (Details) - USD ($) $ in Thousands	Jun. 28, 2020	Dec. 29, 2019
Inventories:
Raw materials	$ 222	$ 222
Work-in-process	2,145	2,370
Finished goods	685	668
Inventories	3,052	3,260
Other current assets:
Prepaid taxes, royalties and other prepaid expenses	975	1,296
Other	187	269
Other current assets	1,162	1,565
Property and equipment, net:
Property and equipment, gross	13,010	12,993
Less: Accumulated depreciation and amortization	(12,419)	(12,163)
Property and equipment, net	591	830
Capitalized internal-use software, net:
Capitalized software	761	365
Less: Accumulated amortization	(89)	(32)
Internal use software net	672	333
Accrued liabilities:
Employee related accruals	537	713
Other	353	420
Accrued liabilities	890	1,133
Equipment
Property and equipment, net:
Property and equipment, gross	10,676	10,694
Software
Property and equipment, net:
Property and equipment, gross	1,789	1,789
Furniture and fixtures
Property and equipment, net:
Property and equipment, gross	36	36
Leasehold improvements
Property and equipment, net:
Property and equipment, gross	$ 509	$ 474

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