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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Statement of Cash Flows [Abstract]
Net loss for the period	$ (14,730)	$ (10,910)
Items not involving cash:
Depletion, depreciation and amortization	813	766
Share-based compensation	862	697
Change in value of warrant liabilities	0	3,504
Accretion of asset retirement obligation	394	321	$ 1,284
Unrealized foreign exchange loss	(1,225)	(433)
Revision and settlement of asset retirement obligation	96	(39)
Other non-cash expenses (income)	3,349	(1,675)
Changes in assets and liabilities
Decrease (increase) in inventories	784	(401)
Increase in trade and other receivables	(1,332)	(10)
Increase in prepaid expenses and other assets	(886)	(626)
Decrease in accounts payable and accrued liabilities	(1,123)	(506)
Net cash (used in) provided by operating activities	(10,548)	(8,446)
INVESTING ACTIVITIES
Purchase of property, plant and equipment	398	602
Maturities and sales of marketable securities	0	1,173
Net cash (used in) provided by investing activities	(398)	571
FINANCING ACTIVITIES
Issuance of common shares for cash, net of issuance cost	4,164	29,914
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units	(892)	(659)
Cash received from exercise of stock options	318	703
Cash received from exercise of warrants	0	436
Net cash (used in) provided by financing activities	3,590	30,394
Effect of exchange rate fluctuations on cash held in foreign currencies	19	25
Net change in cash, cash equivalents and restricted cash	(7,337)	22,544
Cash, cash equivalents and restricted cash, beginning of period	132,822	40,985	40,985
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	125,485	63,529	$ 132,822
Supplemental disclosure of cash flow information:
Interest	$ 9	$ 16

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