LEASES - Maturities of operating and finance lease (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Maturities of operating lease liabilities
2020	$ 889
2021	905
2022	981
2023	964
2024	1,343
Thereafter	442
Total minimum future lease payments	5,524
Less interest	(769)
Total operating lease liabilities	4,755	$ 4,908
Maturities of finance lease liabilities
2020	4,670
2021	30
2022	15
2023	13
2024	8
Thereafter	0
Total minimum future lease payments	4,736
Less interest	(74)
Total finance lease liabilities	$ 4,662	$ 4,633