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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016 | Mar. 31, 2017 | Mar. 28, 2017 | Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity award vesting period | 4 years |  |  |  |  |
Maximum contractual term | 10 years |  |  |  |  |
Closing stock price (in dollars per share) | $ 1.74 |  |  | $ 1.50 | $ 1.50 | $ 1.00
The total intrinsic value of options exercised | $ 31,000 | $ 0 | $ 83,000 |  |  |
Total cash received from employees as a result of employee stock option exercises | 85,000 | 0 | 117,000 |  |  |
Stock-based compensation | 1,441,000 | $ 1,584,000 | $ 2,028,000 |  |  |
Weighted average estimated fair value (in dollars per share) |  | $ 0.46 | $ 0.87 |  |  |
Fair value of unvested stock options, net of forfeitures | 260,000 |  |  |  |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ 239,000 | $ 486,000 | $ 861,000 |  |  |
Weighted average period | 2 years 5 months 1 day |  |  |  |  |
RSUs & PRSUs Outstanding |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ 1,000,000 | $ 953,000 | $ 834,000 |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted average period | 4 years 6 months |  |  |  |  |
Weighted average estimated fair value as defined by amended authoritative guidance (in dollars per share) | $ 0.43 | $ 0.62 | $ 0.42 |  |  |
Sales under ESPP (in shares) | 538,000 | 732,000 | 458,000 |  |  |
Average price of sales under ESPP (in dollars per share) | $ 0.86 | $ 0.81 | $ 1.26 |  |  |
Shares available for issuance (in shares) | 1,600,000 |  |  |  |  |
Compensation expenses related to ESPP | $ 153,000 | $ 258,000 | $ 232,000 |  |  |
Unrecognized stock-based compensation expense | $ 80,000 |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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