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LEASES - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 1,083 $ 889
Operating cash flows from finance leases 11 15
Financing cash flows from finance leases 733 393
ROU assets obtained in exchange for lease obligations:    
Finance leases 1,465 415
Operating leases $ 1,163 $ 26,429