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FAIR VALUE MEASUREMENTS - Assets Measured On a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 30, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | $ 40,914 | $ 36,887
Level 1 | Mutual Fund [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | $ 40,914 | $ 36,887

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