COMMITMENTS AND CONTINGENCIES - Prepayment agreement (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Commitments
Remaining net proceeds recorded as deferred revenue	$ 1,966,000
Auramet International LLC | Prepayment Agreement | Guarantee Obligation | Precious metal
Other Commitments
Net proceeds from sales on a Supplier Advance Basis	4,800,000	$ 22,800,000
Revenue from sales on a Supplier Advance Basis	2,800,000	26,700,000
Remaining net proceeds recorded as deferred revenue	$ 2,000,000.0	$ 2,300,000
Number of ounces of gold	900