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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Net income (loss) for the period $ (4,885) $ 114,264 $ (18,059) $ (14,730) $ 109,379 $ (32,789)  
Adjustments to reconcile net income (loss) to net cash used in operating activities:              
Depletion, depreciation and amortization 660   870   1,319 1,679  
Share-based compensation         2,740 2,009  
Accretion of asset retirement obligations 274   510   620 904 $ 1,556
Revision and settlement of asset retirement obligation         0 (445) (238)
Unrealized foreign exchange (gain) loss         (325) (1,340)  
Unrealized loss on investments accounted for at fair value         2,189 16,837  
Gain on sale of assets (2,807)       (119,257) 0  
Other, net         76 87  
Changes in current assets and liabilities:              
Marketable securities         (335) 172  
Inventories         5,515 1,784  
Trade and other receivables         (2,373) (675)  
Prepaid expenses and other current assets         (1,348) (6,594)  
Accounts payable and accrued liabilities         (2,269) (2,987)  
Net cash used in operating activities         (4,069) (21,358)  
INVESTING ACTIVITIES              
Additions to property, plant and equipment         (5,467) (705)  
Additions to mineral properties         (3,055) 0  
Acquisition of mineral properties         (22,374) 0  
Purchases of marketable securities         (67,775) (11,435)  
Maturities of marketable securities         16,405 0  
Proceeds from sale of assets         56,859 0  
Net cash used in investing activities         (25,407) (12,140)  
FINANCING ACTIVITIES              
Issuance of common shares for cash, net of issuance costs         0 7,886  
Cash received from exercise of stock options         384 395  
Net cash provided by (used in) financing activities         (1,382) 7,386  
Effect of exchange rate fluctuations on cash held in foreign currencies         50 (21)  
Plus: release of restricted cash related to sale of assets         3,590 0  
Net change in cash, cash equivalents and restricted cash         (27,218) (26,133)  
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 $ 53,051   $ 106,689   53,051 106,689 $ 80,269
Non-cash investing and financing transactions:              
Issuance of common shares for consulting services         0 106  
Acquisition of convertible note         59,259 0  
Supplemental disclosure of cash flow information:              
Cash paid during the period for interest         13 17  
Increase (decrease) in accounts payable and accrued liabilities for property, plant and equipment and mineral properties         734 (182)  
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)