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LEASES (Details) - USD ($) $ in Thousands | Jan. 03, 2020 | Dec. 31, 2019 | Sep. 20, 2019 | Jun. 01, 2019 | Oct. 20, 2017
--- | --- | --- | --- | --- | ---
Operating lease liabilities |  |  |  |  |
2020 |  | $ 1,344 |  |  |
2021 |  | 1,408 |  |  |
2022 |  | 1,473 |  |  |
2023 |  | 763 |  |  |
Total undiscounted future minimum lease payments |  | 4,988 |  |  |
Less: Difference between undiscounted lease payments and discounted operating lease liabilities: |  | (495) |  |  |
Operating Lease, Liability, Total | $ 1,400 | 4,493 |  | $ 1,600 | $ 3,900
Finance lease liabilities |  |  |  |  |
2020 |  | 57 |  |  |
2021 |  | 45 |  |  |
2022 |  | 45 |  |  |
2023 |  | 45 |  |  |
2024 |  | 34 |  |  |
Total undiscounted future minimum lease payments |  | 226 |  |  |
Less: Difference between undiscounted lease payments and discounted lease liabilities: |  | (36) |  |  |
Total lease liabilities |  | $ 190 | $ 200 |  |

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