LEASES - Right of use assets and lease liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Right of use assets - long-term	$ 2,037	$ 1,722
Lease liabilities - current	829	412
Lease liabilities - long-term	1,224	1,323
Total lease liabilities	$ 2,053	$ 1,735