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LEASES - Lease Maturity Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Finance leases
Year 1	$ 816	$ 816
Year 2	476	816
Year 3	0	476
Year 4	0	0
Year 5	0	0
Thereafter	0	0
Total lease payments	1,292	2,108
Less: imputed interest	(26)	(68)
Less: lease liabilities, current	(793)	(774)
Lease liabilities, non-current	$ 473	$ 1,266
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Lease liabilities, current	Lease liabilities, current
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Lease liabilities, non-current	Lease liabilities, non-current
Operating leases
Year 1	$ 795	$ 880
Year 2	333	795
Year 3	0	333
Year 4	0	0
Year 5	0	0
Thereafter	0	0
Total lease payments	1,128	2,008
Less: imputed interest	(43)	(123)
Less: lease liabilities, current	(756)	(801)
Lease liabilities, non-current	$ 329	$ 1,084
Operating Lease, Liability, Current, Statement of Financial Position	Lease liabilities, current	Lease liabilities, current
Operating Lease, Liability, Noncurrent, Statement of Financial Position	Lease liabilities, non-current	Lease liabilities, non-current

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