Warrants - Class A, Class B, Class C, Korea Zinc, Nauru and Tonga Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Class A Warrants
Warrants
Number of warrants outstanding	4,317,500	4,317,500
Exercise price of warrants	$ 2
Warrants exercised	0
Value of outstanding warrants	$ 3,600	$ 3,600
Class B Warrants
Warrants
Number of warrants outstanding	15,000	15,000
Exercise price of warrants	$ 2
Warrants exercised	0
Value of outstanding warrants	$ 9	$ 9
Number of shares issuable per warrant	1
Class C Warrants
Warrants
Number of warrants outstanding	10,003,333	10,003,333
Exercise price of warrants	$ 4.5
Warrants exercised	0
Value of outstanding warrants	$ 10,200	$ 10,200
Number of shares issuable per warrant	1
Korea Zinc Warrants
Warrants
Exercise price of warrants	$ 7
Warrants exercised	0
Value of outstanding warrants	$ 11,500	$ 11,500
Warrants issued	6,868,181	6,868,181
Nauru Warrants
Warrants
Number of warrants outstanding	9,146,268	9,146,268
Exercise price of warrants	$ 4.72
Warrants exercised	0
Value of outstanding warrants	$ 33,100	$ 33,100
Tonga Warrants
Warrants
Exercise price of warrants	$ 5.87
Warrants exercised	0
Value of outstanding warrants	$ 5,000	$ 5,000
Warrants issued	1,000,000	1,000,000