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FAIR VALUE MEASUREMENTS (Details) - Fair value, measurements, recurring - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | ---
Assets: |  |
Total assets | $ 15,635 | $ 14,692
Level 1 |  |
Assets: |  |
Total assets | 7,176 | 1,338
Level 2 |  |
Assets: |  |
Total assets | 8,459 | 13,354
Level 3 |  |
Assets: |  |
Total assets | 0 | 0
Money market funds |  |
Assets: |  |
Money market funds | 15,635 | 14,692
Money market funds | Level 1 |  |
Assets: |  |
Money market funds | 7,176 | 1,338
Money market funds | Level 2 |  |
Assets: |  |
Money market funds | 8,459 | 13,354
Money market funds | Level 3 |  |
Assets: |  |
Money market funds | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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