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INCOME TAXES - Narrative (Details) - USD ($) | Jan. 01, 2017 | Jan. 03, 2016 | Dec. 28, 2014 | Dec. 29, 2013
--- | --- | --- | --- | ---
Operating Loss Carryforwards [Line Items] |  |  |  |
Undistributed earnings for certain foreign subsidiaries | $ 500,000 |  |  |
Unrecognized tax benefits | 2,014,000 | $ 696,000 | $ 516,000 | $ 79,000
Accrued interest and penalties related to uncertain tax positions | 0 | $ 17,000 |  |
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 148,700,000 |  |  |
Federal | Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Research credit carryforward | 4,000,000 |  |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 57,400,000 |  |  |
State | Research Tax Credit Carryforward |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Research credit carryforward | $ 4,100,000 |  |  |

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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