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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Cash Flows [Abstract]    
Net loss for the period $ (10,910) $ (5,664)
Items not involving cash:    
Depletion, depreciation and amortization 766 299
Share-based compensation 697 997
Change in value of Convertible Debentures 0 (465)
Change in value of warrant liabilities 3,504 (1,146)
Accretion of asset retirement obligation 321 478
Unrealized foreign exchange loss (433) (394)
Revision of asset retirement obligation (39) 0
Impairment of inventories 0 1,078
Other non-cash expenses (1,675) 795
Changes in assets and liabilities    
Increase in inventories (401) (2,122)
(Increase) decrease in trade and other receivables (10) 37
Increase in prepaid expenses and other assets (626) (495)
Decrease in accounts payable and accrued liabilities (506) (2,510)
Net cash (used in) provided by operating activities (8,446) (8,324)
INVESTING ACTIVITIES    
Purchase of property, plant and equipment 602 0
Maturities and sales of marketable securities 1,173 2,200
Net cash (used in) provided by investing activities 571 2,200
FINANCING ACTIVITIES    
Issuance of common shares for cash, net of issuance cost 29,914 19,095
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (659) (415)
Repayment of loans and borrowings 0 241
Cash received from exercise of warrants 436 0
Cash received from exercise of stock options 703 0
Cash received from non-controlling interest 0 133
Net cash (used in) provided by financing activities 30,394 18,572
Effect of exchange rate fluctuations on cash held in foreign currencies 25 (1,676)
Net change in cash, cash equivalents and restricted cash 22,544 10,772
Cash, cash equivalents and restricted cash, beginning of period 40,985 32,891
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 63,529 43,663
Supplemental disclosure of cash flow information:    
Interest $ 16 $ 22