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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Statement of Cash Flows [Abstract]    
Net loss for the period $ (21,701) $ (13,854)
Items not involving cash:    
Depletion, depreciation and amortization 1,559 1,104
Share-based compensation 1,190 1,701
Change in value of Convertible Debentures 0  
Change in value of warrant liabilities 7,050 92
Accretion of asset retirement obligation 672 956
Unrealized foreign exchange (gain) loss 1,597 706
Revision of asset retirement obligation (39) 0
Impairment of inventories 0 1,506
Other non-cash expenses (1,578) 647
Changes in assets and liabilities    
Increase in inventories (1,635) (4,765)
(Increase) decrease in trade and other receivables (47) 401
(Increase) decrease in prepaid expenses and other assets (182) 188
Decrease in accounts payable and accrued liabilities (190) (3,100)
Net cash (used in) provided by operating activities (16,498) (15,830)
INVESTING ACTIVITIES    
Purchase of property, plant and equipment 757 152
Maturities and sales of marketable securities 2,554 3,203
Net cash (used in) provided by investing activities 1,797 3,051
FINANCING ACTIVITIES    
Issuance of common shares for cash, net of issuance cost 67,099 27,862
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (659) (415)
Repayment of loans and borrowings 0 484
Cash received from exercise of warrants 4,079 0
Cash received from exercise of stock options 1,463 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 72,163 27,096
Effect of exchange rate fluctuations on cash held in foreign currencies 1,409 (336)
Net change in cash, cash equivalents and restricted cash 58,871 13,981
Cash, cash equivalents and restricted cash, beginning of period 40,985 32,891
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 99,856 46,872
Supplemental disclosure of cash flow information:    
Interest $ 30 $ 695