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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |
Net loss for the period | $ (8,938) | $ (5,664) | $ (6,939) | $ (12,134) | $ (22,792) | $ (28,387) |
Items not involving cash: |  |  |  |  |  |  |
Depletion, depreciation and amortization |  |  |  |  | 1,911 | 921 |
Share-based compensation |  |  |  |  | 2,369 | 2,498 |
Change in value of Convertible Debentures | (153) |  | (940) |  | (153) | (447) |
Change in value of warrant liabilities |  |  |  |  | (215) | (3,281) |
Accretion of asset retirement obligation | 478 |  | 484 |  | 1,434 | 1,478 | $ 1,931
Unrealized foreign exchange gain |  |  |  |  | 860 | 142 |
Impairment of inventories | 140 |  | 2,330 |  | 1,644 | 8,412 |
Revision of asset retirement obligation |  |  |  |  | 0 | 151 |
Other non-cash expenses |  |  |  |  | 649 | 2,367 |
Changes in assets and liabilities |  |  |  |  |  |  |
Increase in inventories |  |  |  |  | (5,748) | (12,854) |
Decrease in trade and other receivables |  |  |  |  | 291 | 234 |
Increase in prepaid expenses and other assets |  |  |  |  | (442) | (236) |
Decrease in accounts payable and accrued liabilities |  |  |  |  | (3,364) | (2,688) |
Changes in deferred revenue |  |  |  |  | 0 | (2,724) |
Net cash (used in) provided by operating activities |  |  |  |  | (25,276) | (34,698) |
INVESTING ACTIVITIES |  |  |  |  |  |  |
Purchase of property, plant and equipment |  |  |  |  | 515 | 0 |
Maturities and sales of marketable securities |  |  |  |  | 3,707 | 19,530 |
Net cash (used in) provided by investing activities |  |  |  |  | 3,192 | 19,530 |
FINANCING ACTIVITIES |  |  |  |  |  |  |
Issuance of common shares for cash, net of issuance cost |  |  |  |  | 44,642 | 14,696 |
Proceeds from Notes Payable |  |  |  |  | 0 | 801 |
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units |  |  |  |  | (415) | 0 |
Repayment of loans and borrowings |  |  |  |  | 8,303 | 79 |
Cash received from exercise of warrants |  |  |  |  | 0 | 5 |
Cash received from exercise of stock options |  |  |  |  | 0 | 146 |
Cash received from non-controlling interest |  |  |  |  | 133 | 46 |
Net cash (used in) provided by financing activities |  |  |  |  | 36,057 | 15,615 |
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH DURING THE PERIOD |  |  |  |  | 13,973 | 447 |
Effect of exchange rate fluctuations on cash held in foreign currencies |  |  |  |  | (52) | 43 |
Cash, cash equivalents and restricted cash - beginning of period |  | $ 32,891 |  | $ 34,292 | 32,891 | 34,292 | 34,292
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - END OF PERIOD | $ 46,812 |  | $ 34,782 |  | 46,812 | 34,782 | $ 32,891
Supplemental disclosure of cash flow information: |  |  |  |  |  |  |
Interest |  |  |  |  | 720 | 1,110 |
Warrant liability transferred to equity upon exercise |  |  |  |  | $ 0 | $ 2 |

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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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