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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