SEGMENT REPORTING - Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2026	Dec. 31, 2025
SEGMENT REPORTING
Consolidated total assets	$ 185,971	$ 185,971	$ 194,533
Corporate And Other
SEGMENT REPORTING
Consolidated total assets	38,902	38,902	48,972
Battery-grade graphite business
SEGMENT REPORTING
Expenditures for battery-grade graphite business segment assets	700	2,300
Battery-grade graphite business \| Operating Segment
SEGMENT REPORTING
Consolidated total assets	$ 147,069	$ 147,069	$ 145,561

Amount of asset recognized for present right to economic benefit.

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+ Details