LEASES - Right-of use Assets and Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
LEASES
Right-of-use assets	$ 5,743
Financial position	us-gaap:OtherAssetsNoncurrent
Short-term lease liabilities	$ 2,985
Financial position	us-gaap:OtherLiabilitiescurrent
Long-term lease liabilities	$ 2,939
Financial position	us-gaap:OtherLiabilitiesNoncurrent
Total lease liability	$ 5,924