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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Net income (loss) for the period $ 10,469 $ 114,264 $ (9,254) $ (14,730) $ 119,849 $ (42,043)  
Adjustments to reconcile net income (loss) to net cash used in operating activities:              
Depletion, depreciation and amortization 690   850   2,024 2,529  
Share-based compensation         4,033 3,292  
Accretion of asset retirement obligations 282   397   902 1,301 $ 1,556
Revision and settlement of asset retirement obligation         0 (238) (238)
Unrealized foreign exchange gain         (85) (2,284)  
Unrealized (gain) loss on investments accounted for at fair value         (6,701) 13,716  
Unrealized gain on convertible note         (6,972) 0  
Gain on sale of assets 0       (119,257) 0  
Other, net         (682) 116  
Changes in current assets and liabilities:              
Marketable securities         (875) 181  
Inventories         10,807 2,729  
Trade and other receivables         (10,570) 565  
Prepaid expenses and other current assets         (1,526) (7,614)  
Accounts payable and accrued liabilities         (1,929) (1,703)  
Net cash used in operating activities         (10,982) (29,453)  
INVESTING ACTIVITIES              
Additions to property, plant and equipment         (8,908) (1,237)  
Additions to mineral properties         (4,401) 0  
Acquisition of mineral properties         (22,491) 0  
Purchases of marketable securities         (98,896) (11,435)  
Maturities of marketable securities         41,931 0  
Proceeds from sale of assets         56,873 0  
Proceeds from convertible note redemption 20,000       20,000 0  
Net cash used in investing activities         (15,892) (12,672)  
FINANCING ACTIVITIES              
Issuance of common shares for cash, net of issuance costs         16,047 7,886  
Cash received from exercise of stock options         757 472  
Net cash provided by financing activities         15,038 7,463  
Effect of exchange rate fluctuations on cash held in foreign currencies         33 (84)  
Plus: release of restricted cash related to sale of assets         3,590 0  
Net change in cash, cash equivalents and restricted cash         (8,213) (34,746)  
Cash, cash equivalents and restricted cash, beginning of period   $ 80,269   $ 132,822 80,269 132,822 132,822
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 72,056   $ 98,076   72,056 98,076 $ 80,269
Non-cash investing and financing transactions:              
Issuance of common shares for consulting services         0 150  
Acquisition of convertible note         59,259 0  
Supplemental disclosure of cash flow information:              
Cash paid during the period for interest         13 22  
Increase (decrease) in accounts payable and accrued liabilities for property, plant and equipment and mineral properties         697 (116)  
Stock Appreciation Rights (SARs)              
FINANCING ACTIVITIES              
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units         (848) (11)  
Restricted Stock Units (RSUs)              
FINANCING ACTIVITIES              
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units         $ (918) $ (884)