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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 01, 2017 | Jan. 03, 2016 | Dec. 28, 2014 | Mar. 31, 2016 | Mar. 21, 2016 | Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity award vesting period | 4 years |  |  |  |  |
Maximum contractual term | 10 years |  |  |  |  |
Stock-based compensation | $ 1,584,000 | $ 2,028,000 | $ 2,242,000 |  |  |
Weighted average estimated fair value (in dollars per share) | $ 0.46 | $ 0.87 | $ 1.99 |  |  |
Fair value of unvested stock options, net of forfeitures | $ 1,600,000 |  |  |  |  |
Closing stock price (in dollars per share) | $ 1.39 |  |  | $ 1.00 | $ 1.00 | $ 2.90
The total intrinsic value of options exercised | $ 0 | $ 83,000 | $ 3,700,000 |  |  |
Total cash received from employees as a result of employee stock option exercises | 0 | 117,000 | 4,500,000 |  |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ 486,000 | $ 861,000 | $ 1,100,000 |  |  |
Weighted average period | 3 years 1 month 6 days |  |  |  |  |
RSUs & PRSUs Outstanding |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ 953,000 |  |  |  |  |
PRSU |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ (113,000) |  |  |  |  |
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) | $ 0.62 | $ 0.42 | $ 0.96 |  |  |
Sales under ESPP (in shares) | 732,000 | 458,000 | 278,000 |  |  |
Average price of sales under ESPP (in dollars per share) | $ 0.81 | $ 1.26 | $ 2.76 |  |  |
Shares available for issuance (in shares) | 687,000 |  |  |  |  |
Compensation expenses related to ESPP | $ 258,000,000 | $ 232,000 | $ 255,000 |  |  |
Unrecognized stock-based compensation expense | $ 97,000 |  |  |  |  |

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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=6415400&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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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