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LEASES - Other (Details) $ in Thousands	3 Months Ended		9 Months Ended
LEASES - Other (Details) $ in Thousands	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) item	Sep. 30, 2019 USD ($)
LEASES
Lease rent expense	$ 40	$ 30	$ 100	$ 100
Purchase commitment			$ 26,700
Number of units under lease agreement \| item			189
Noncancellable commitments for purchases of equipment	$ 6,700		$ 6,700