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INCOME TAXES - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Corporate income tax rate | 35.00% | 21.00% |  |
Unrecognized tax benefits | $ 2,161,000 | $ 2,107,000 | $ 2,014,000 | $ 696,000
Unrecognized tax benefits that would affect effective tax rate | 0 |  |  |
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 157,400,000 |  |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carryforwards | 63,600,000 |  |  |
State | Research |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward | 4,600,000 |  |  |
Federal | Research |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit carryforward | $ 4,100,000 |  |  |

X
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