LEASES - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	May 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Option to Terminate		the renewal option and any option to terminate is not reasonably certain
Operating lease right-of-use assets		$ 364	$ 87
Lease liability		364
Operating lease liability, current		113	$ 91
Total lease payments		$ 422
Lease not yet commenced, Term		5 years
Net present value of lease not yet commenced		$ 1,100
Centennial, Colorado
Lessee, Lease, Description [Line Items]
Total lease payments		$ 400
Corporate office
Lessee, Lease, Description [Line Items]
Lease extension term	3 years
Lessee, Operating Lease, Assumptions and Judgments, Allocation of Lease and Nonlease Component		Because these amounts are related to common area maintenance of the leased space, they are considered a non-lease component and 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
Lessee, Lease, Description [Line Items]
Lease term using a discount rate		3.00%
Minimum | Office equipment
Lessee, Lease, Description [Line Items]
Remaining lease term		2 years 7 months 6 days
Maximum
Lessee, Lease, Description [Line Items]
Lease term using a discount rate		12.00%
Maximum | Office equipment
Lessee, Lease, Description [Line Items]
Remaining lease term		3 years 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