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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Statement of Cash Flows [Abstract]              
Net loss for the period $ (18,059) $ (14,730) $ (10,791) $ (10,910) $ (32,789) $ (21,701)  
Items not involving cash:              
Depletion, depreciation and amortization 870   790   1,679 1,559  
Share-based compensation         2,009 1,190  
Change in value of warrant liabilities         0 7,050  
Accretion of asset retirement obligation 510   351   904 672 $ 1,284
Unrealized foreign exchange gain         1,340 1,597  
Revision and settlement of asset retirement obligation         (445) (39)  
Unrealized gain on available-for-sale assets         16,837 (1,021)  
Other non-cash expenses (income)         259 (557)  
Changes in assets and liabilities              
Decrease (increase) in inventories         1,784 (1,635)  
Increase in trade and other receivables         (675) (47)  
Increase in prepaid expenses and other assets         (6,594) (182)  
Decrease in accounts payable and accrued liabilities         (2,987) (190)  
Net cash (used in) provided by operating activities         (21,358) (16,498)  
INVESTING ACTIVITIES              
Purchase of property, plant and equipment         705 757  
Payments to Acquire Marketable Securities         (11,435) 0  
Maturities and sales of marketable securities         0 2,554  
Net cash (used in) provided by investing activities         (12,140) 1,797  
FINANCING ACTIVITIES              
Issuance of common shares for cash, net of issuance cost         7,886 67,099  
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units         (884) (659)  
Cash received from exercise of stock options         395 1,463  
Cash received from exercise of warrants         0 4,079  
Cash paid to settle and fund employee income tax withholding due upon exercise of stock appreciation rights         (11) (48)  
Cash received from non-controlling interest         0 229  
Net cash (used in) provided by financing activities         7,386 72,163  
Effect of exchange rate fluctuations on cash held in foreign currencies         (21) 1,409  
Net change in cash, cash equivalents and restricted cash         (26,133) 58,871  
Cash, cash equivalents and restricted cash, beginning of period   $ 132,822   $ 40,985 132,822 40,985 40,985
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 106,689   $ 99,856   106,689 99,856 $ 132,822
Supplemental disclosure of cash flow information:              
Interest         $ 17 $ 30