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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 62,927	$ 52,516	$ 142,869	$ 212,240
Rare earth concentrate (including related party)
Disaggregation of Revenue [Line Items]
Total revenue	43,053	52,472	107,555	212,139
NdPr oxide and metal (including related party)
Disaggregation of Revenue [Line Items]
Total revenue	19,179	0	34,037	0
Other revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 695	$ 44	$ 1,277	$ 101

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