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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
OPERATING ACTIVITIES      
Net income (loss) for the period $ 1,448 $ (27,872) $ (38,094)
Items not involving cash:      
Depletion, depreciation and amortization 3,189 2,701 1,213
Share-based compensation 2,158 2,598 3,771
Gain on disposal of non-core assets (35,733) 0 0
Change in value of Convertible Debentures 0 (156) (291)
Change in value of warrant liabilities 8,078 5,436 (3,726)
Accretion of asset retirement obligation 1,284 1,911 1,931
Unrealized foreign exchange (gain) loss 129 (1,045) 78
Revision and settlement of asset retirement obligation (369) (7,845) (1,421)
Impairment of inventories 0 1,644 14,351
Other non-cash (income) expenses (6,893) (707) 2,314
Changes in assets and liabilities      
Increase in inventories (3,219) (6,100) (18,534)
(Increase) decrease in trade and other receivables (1,249) 192 (63)
(Increase) decrease in prepaid expenses and other assets (257) 149 12
Increase (decrease) in accounts payable and accrued liabilities 2,140 (3,084) (3,195)
Changes in deferred revenue 0 0 (2,724)
Net cash used in operating activities (29,294) (32,178) (44,378)
INVESTING ACTIVITIES      
Purchase of property, plant and equipment (1,368) (627) 0
Maturities and sales of marketable securities 2,554 4,208 22,575
Disposal of non-core assets 2,000 0 0
Net cash provided by investing activities 3,186 3,581 22,575
FINANCING ACTIVITIES      
Issuance of common shares for cash, net of issuance costs 106,208 52,390 19,678
Proceeds from notes payable 0 0 801
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units (538) (415) 0
Cash received from exercise of stock options 2,375 491 146
Cash received from exercise of warrants 9,840 0 5
Cash paid to settle and fund employee income tax withholding due upon exercise of stock appreciation rights (256) 0 0
Repayment of loans and borrowings 0 (16,015) (317)
Cash received from non-controlling interest 311 133 46
Net cash provided by financing activities 117,940 36,584 20,359
Effect of exchange rate fluctuations on cash held in foreign currencies 5 107 43
Net change in cash, cash equivalents and restricted cash 91,837 8,094 (1,401)
Cash, cash equivalents and restricted cash, beginning of period 40,985 32,891 34,292
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD 132,822 40,985 32,891
Capital Expenditures Incurred but Not yet Paid 182 0 0
Non-cash investing and financing transactions:      
Issuance of common shares to settle liabilities 0 0 847
Issuance of common shares for consulting services 242 188 208
Interest 54 952 1,491
Warrant liability transferred to equity upon exercise $ 0 $ 0 $ 2