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Financing Activity - Registered Direct Offering (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
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Jul. 01, 2025 | Jun. 16, 2025 | May 12, 2025 | Jul. 31, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 25, 2025 | Jun. 10, 2025 | May 22, 2025 | Feb. 06, 2025 | Dec. 31, 2024 | Nov. 26, 2024
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Registered Direct Offering |  |  |  |  |  |  | $ 35,010 | $ 9,000 |  |  |  |  |  |
Gross proceeds from private placement |  |  |  |  |  |  | 85,165 |  |  |  |  |  |  |
Expenses paid for Registered Direct Offering |  |  |  |  |  |  | $ 492 | $ 142 |  |  |  |  |  |
Agreement with Korea Zinc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to sell and issue |  | 19,623,376 |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued |  | 6,868,181 |  |  | 6,868,181 |  | 6,868,181 |  |  |  |  |  |  |
Net proceeds from private placement |  |  |  |  | $ 83,300 |  |  |  |  |  |  |  |  |
Gross proceeds from private placement |  | $ 85,200 |  |  | $ 85,200 |  |  |  |  |  |  |  |  |
Share price |  | $ 4.34 |  |  |  |  |  |  |  |  |  |  |  |
Number of private placement (in Shares) |  |  |  |  | 19,623,376 |  |  |  |  |  |  |  |  |
Payment of stock issuance costs for private placement |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |  |
Class B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |
Class C Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  | $ 4.5 |  | $ 4.5 |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  |  |  |  |  | 1,003,334 | 6,666,666 | 2,333,333 |  |  |
Number of warrants issued |  |  |  |  | 10,003,333 |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of issuance of shares under Registered Direct Offering (in shares) |  |  |  |  | 9,000,000 |  |  | 4,500,000 |  |  |  |  |  |
Number of private placement (in Shares) |  |  |  |  | 19,623,376 |  | 19,623,376 |  |  |  |  |  |  |
2024 Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining committed fund |  |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |
Net proceeds from Registered Direct Offering |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |
2024 Registered Direct Offering | Class B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to sell and issue |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 |  |
Net proceeds from Registered Direct Offering |  |  |  |  |  | 2,800 |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  |  |  |  |  |  |  |  |  | $ 2 |
2024 Registered Direct Offering | Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to sell and issue |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  | 19,900,000
Net proceeds from Registered Direct Offering |  |  |  |  |  | $ 2,200 |  |  |  |  |  |  |  |
Number of issuance of shares under Registered Direct Offering (in shares) |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |
2024 Registered Direct Offering | Common Shares | Class B Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to sell and issue |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,950,000
2025 Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance |  |  | $ 37,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Registered Direct Offering |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |
Number of issuance of shares under Registered Direct Offering (in shares) |  |  |  |  | 9,000,000 |  |  |  |  |  |  |  |  |
Net proceeds from private placement |  |  |  |  |  |  | $ 36,700 |  |  |  |  |  |  |
Expenses paid for Registered Direct Offering |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |
2025 Registered Direct Offering | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Registered Direct Offering |  |  |  | $ 7,000 |  |  |  |  |  |  |  |  |  |
Number of issuance of shares under Registered Direct Offering (in shares) |  |  |  | 3,333,333 |  |  |  |  |  |  |  |  |  |
2025 Registered Direct Offering | Class C Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  | $ 3 |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued |  |  |  |  | 10,003,333 |  |  |  |  |  |  |  |  |
2025 Registered Direct Offering | Class C Warrants | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Registered Direct Offering | $ 7,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued | 2,330,000 |  |  | 2,330,000 |  |  |  |  |  |  |  |  |  |
2025 Registered Direct Offering | Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to sell and issue |  |  | 12,333,333 |  |  |  |  |  |  |  |  |  |  |
Number of issuance of shares under Registered Direct Offering (in shares) |  |  |  |  |  |  | 9,000,000 |  |  |  |  |  |  |
2025 Registered Direct Offering | Common Shares | Class C Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Activity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares agreed to sell and issue |  |  | 12,333,333 |  |  |  |  |  |  |  |  |  |  |

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