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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Accounting Policies [Abstract] |  |  |
Advertising and promotions | $ 399 | $ 357 | $ 147

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- References No definition available. + Details
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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration