BALANCE SHEET COMPONENTS - Schedule of Balance Sheet Components (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Jan. 03, 2016
Inventories:
Raw materials	$ 0	$ 0
Work-in-process	1,538	1,720
Finished goods	479	1,158
Inventories	2,017	2,878
Other current assets:
Prepaid expenses	960	1,184
Other	163	128
Other current assets	1,123	1,312
Property and equipment:
Property and equipment, gross	14,897	18,490
Accumulated depreciation and amortization	(12,132)	(15,175)
Property and equipment, net	2,765	3,315
Accrued liabilities:
Employee compensation related accruals	1,222	1,237
Other	358	245
Accrued liabilities	1,580	1,482
Equipment
Property and equipment:
Property and equipment, gross	11,524	14,531
Software
Property and equipment:
Property and equipment, gross	2,624	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