LEASES - Components of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finance lease cost:
Amortization of leased asset	$ 18	$ 18	$ 54	$ 42
Interest on lease liabilities	5	7	17	17
Operating lease cost	169	594	668	1,587
Short-term lease cost	235	0	476	47
Total lease cost	$ 427	$ 619	$ 1,215	$ 1,693
Weighted-average remaining lease term, operating leases	2 years 5 months 4 days		2 years 5 months 4 days
Weighted-average remaining lease term, finance leases	1 year 7 months 28 days		1 year 7 months 28 days
Weighted-average discount rate, operating leases	11.55%		11.55%
Weighted-average discount rate, finance leases	13.18%		13.18%

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- Definition

Amount of interest expense on finance lease liability.

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- Definition

Amount of amortization expense attributable to right-of-use asset from finance lease.

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Weighted average discount rate for finance lease calculated at point in time.

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- Definition

Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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