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Equity Method Investment in Smackover Lithium - Summarized financial information (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Jun. 30, 2024
Equity Method Investment in Joint Ventures        
Net loss $ 29,511 $ 48,398 $ 1,286 $ (105,801)
Company's share of net loss 707 6,358 707 158
Current assets 33,305 157,687 33,305 41,517
Non-current assets 226,191 228,829 226,191 245,774
TOTAL ASSETS 259,496 386,516 259,496 287,291
Current liabilities 5,772 10,086 5,772 12,598
Non-current liabilities 25,667 22,472 25,667 26,312
TOTAL LIABILITIES 31,439 32,558 31,439 38,910
Carrying amount of investment in Smackover Lithium 146,158 168,868 146,158 146,865
SWA Lithium        
Equity Method Investment in Joint Ventures        
Net loss   9,530 1,191  
Company's share of net loss 655 5,242 655  
Current assets 20,221 12,741 20,221  
Non-current assets 54,351 82,994 54,351  
TOTAL ASSETS 74,572 95,735 74,572  
Current liabilities 5,788 7,139 5,788  
Non-current liabilities 8   8  
TOTAL LIABILITIES 5,796 7,139 5,796  
Net assets 68,776 88,596 68,776  
Company's share of Smackover Lithium 37,827 48,728 37,827  
Adjustments to the Company's share of net assets 56,437 56,437 56,437  
Carrying amount of investment in Smackover Lithium 94,264 105,165 94,264 94,919
Texas Lithium        
Equity Method Investment in Joint Ventures        
Net loss   2,030 95  
Company's share of net loss 52 1,116 52  
Current assets 14,208 10,989 14,208  
Non-current assets 38,030 64,392 38,030  
TOTAL ASSETS 52,238 75,381 52,238  
Current liabilities 2,984 4,656 2,984  
TOTAL LIABILITIES 2,984 4,656 2,984  
Net assets 49,254 70,725 49,254  
Company's share of Smackover Lithium 27,090 38,899 27,090  
Adjustments to the Company's share of net assets 24,804 24,804 24,804  
Carrying amount of investment in Smackover Lithium 51,894 63,703 51,894 $ 51,946
Total        
Equity Method Investment in Joint Ventures        
Net loss   11,560    
Company's share of net loss   6,358    
Current assets 34,429 23,730 34,429  
Non-current assets 92,381 147,386 92,381  
TOTAL ASSETS 126,810 171,116 126,810  
Current liabilities 8,772 11,795 8,772  
Non-current liabilities 8   8  
TOTAL LIABILITIES 8,780 11,795 8,780  
Net assets 118,030 159,321 118,030  
Company's share of Smackover Lithium 64,917 87,627 64,917  
Adjustments to the Company's share of net assets 81,241 81,241 81,241  
Carrying amount of investment in Smackover Lithium $ 146,158 $ 168,868 $ 146,158