BALANCE SHEET COMPONENTS (Details) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017
Inventories:
Work-in-process	$ 3,120	$ 2,894
Finished goods	716	665
Inventories	3,836	3,559
Other current assets:
Prepaid expenses	1,483	836
Other	292	161
Other current assets	1,775	997
Property and equipment:
Property and equipment, gross	14,149	14,855
Accumulated depreciation and amortization	(12,700)	(12,480)
Property and equipment, net	1,449	2,375
Accrued liabilities:
Employee compensation related accruals	1,154	1,143
Other	749	510
Accrued liabilities	1,903	1,653
Equipment
Property and equipment:
Property and equipment, gross	10,607	10,996
Software
Property and equipment:
Property and equipment, gross	2,788	3,139
Furniture and fixtures
Property and equipment:
Property and equipment, gross	42	46
Leasehold improvements
Property and equipment:
Property and equipment, gross	$ 712	$ 674