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SEGMENT REPORTING - Profit or Loss And Significant Segment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
SEGMENT REPORTING        
Other (expense) income, net $ (5,756) $ (353) $ (6,091) $ (1,239)
Product development expenses (370) (254) (827) (850)
Exploration expenses (2)   (12) (11)
General and administrative expenses (3,451) (2,425) (8,878) (7,519)
Mineral property (13) (13) (23) (19)
Depreciation and amortization (244) (63) (550) (187)
Net Loss (9,836) (3,108) (16,381) (9,825)
Corporate And Other        
SEGMENT REPORTING        
Other (expense) income, net (5,778) 44 (5,795) 230
General and administrative expenses (2,596) (1,944) (6,966) (6,420)
Depreciation and amortization (1) (2) (3) (4)
Net Loss (8,375) (1,902) (12,764) (6,194)
Battery-grade Graphite Segment | Operating Segment        
SEGMENT REPORTING        
Other (expense) income, net 22 (397) (296) (1,469)
Product development expenses (370) (254) (827) (850)
Exploration expenses (2)   (12) (11)
General and administrative expenses (855) (481) (1,912) (1,099)
Mineral property (13) (13) (23) (19)
Depreciation and amortization (243) (61) (547) (183)
Net Loss $ (1,461) $ (1,206) $ (3,617) $ (3,631)