COMMITMENTS AND CONTINGENCIES - The Company's right-of-use assets and lease liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Right-of-use assets:
Operating	$ 4,298	$ 4,863
Finance	4,343	3,979
Lease liabilities:
Operating	12,077	12,590
Finance	$ 3,707	$ 3,379