LEASES - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Right-of-use lease asset	$ 258		$ 353
Lease liability	268		363
Current portion of lease liabilities	$ 151		149
Lease term using a discount rate	9.50%
Lease expense:
Operating lease cost	$ 115	$ 112
Supplemental cash flow information related to leases:
Cash flows from operating leases	115	115
Operating leases	258	$ 383
Supplemental balance sheet information related to leases:
Operating lease right-of-use assets	258		353
Current portion of lease liabilities	151		149
Operating lease liabilities - Long term portion	117		214
Total operating lease liabilities	$ 268		$ 363
Weighted Average Remaining Lease Term (in years)	1 year 9 months 18 days	3 years
Discount Rate	9.50%	9.50%
Corporate office
Lessee, Lease, Description [Line Items]
Variable lease terms	Because these amounts are variable from year to year and not specifically set in the lease terms, they are not included in the measurement of the right-of-use asset and related lease liability, but rather expensed in the period incurred.
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Option to extend, renewal term	3 years
Minimum | Corporate offices, storage space and equipment
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year 1 month 6 days
Maximum | Corporate offices, storage space and equipment
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year 9 months 18 days
Maximum | Land used in exploration and mining activities, office equipment, machinery, office space, storage and other
Lessee, Lease, Description [Line Items]
Term of contract	1 year