Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Statement of Cash Flows [Abstract]
Net loss for the period	$ (29,658)	$ (22,792)
Items not involving cash:
Depletion, depreciation and amortization	2,363	1,911
Share-based compensation	1,702	2,369
Change in value of Convertible Debentures	0	(153)
Change in value of warrant liabilities	8,050	(215)
Accretion of asset retirement obligation	1,022	1,434
Unrealized foreign exchange (gain) loss	(440)	860
Revision of asset retirement obligation	(39)	0
Impairment of inventories	0	1,644
Other non-cash expenses	(3,017)	649
Changes in assets and liabilities
Increase in inventories	(1,673)	(5,748)
(Increase) decrease in trade and other receivables	(61)	291
Increase in prepaid expenses and other assets	(678)	(442)
Decrease in accounts payable and accrued liabilities	(434)	(3,364)
Net cash (used in) provided by operating activities	(21,983)	(25,276)
INVESTING ACTIVITIES
Purchase of property, plant and equipment	953	515
Maturities and sales of marketable securities	2,554	3,707
Net cash (used in) provided by investing activities	1,601	3,192
FINANCING ACTIVITIES
Issuance of common shares for cash, net of issuance cost	92,122	44,642
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units	(659)	(415)
Repayment of loans and borrowings	0	8,303
Cash received from exercise of warrants	6,627	0
Cash received from exercise of stock options	1,718	0
Cash paid to settle and fund employee income tax withholding due upon exercise of stock appreciation rights	(48)	0
Cash received from non-controlling interest	229	133
Net cash (used in) provided by financing activities	99,989	36,057
Effect of exchange rate fluctuations on cash held in foreign currencies	(61)	(52)
Net change in cash, cash equivalents and restricted cash	79,546	13,921
Cash, cash equivalents and restricted cash, beginning of period	40,985	32,891
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	120,531	46,812
Supplemental disclosure of cash flow information:
Interest	$ 43	$ 720

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