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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period	4 years
Term of equity awards granted	10 years
Intrinsic value stock options	$ 0
Share price (in dollars per share)	$ 0.76
Total cash received from employees as a result of employee stock option exercises	$ 195,000	$ 85,000	$ 0
Total stock-based compensation	$ 1,901,000	$ 1,441,000	$ 1,584,000
Stock options granted in period	0	0	842,000
Fair value of unvested stock options, net of unvested forfeitures	$ 145,000
Weighted average estimated fair value (in dollars per share)	$ 1.23	$ 1.54	$ 1.68	$ 2.30
Sales under ESPP (in shares)	1,539,000	1,852,000	1,822,000
Average price of sales under ESPP (in dollars per share)	$ 0.85	$ 1.41	$ 0.97
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 1,600,000	$ 1,000,000	$ 953,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense weighted average period	4 months 15 days
Weighted average estimated fair value (in dollars per share)	$ 0.37	$ 0.43	$ 0.62
Sales under ESPP (in shares)	438,000	538,000	732,000
Average price of sales under ESPP (in dollars per share)	$ 1.1	$ 0.86	$ 0.81
Shares reserved for issuance (in shares)	1,200,000
Stock-based compensation expense	$ 205,000	$ 153,000	$ 258,000
Unrecognized compensation expense	73,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 131,000	$ 239,000	$ 486,000
Stock options granted in period	0
Unrecognized stock-based compensation expense weighted average period	1 year 7 months 2 days

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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