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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Statement of Cash Flows [Abstract] |  |  |
Net loss for the period | $ (5,664) | $ (12,134) |
Items not involving cash: |  |  |
Depletion, depreciation and amortization | 299 | 314 |
Share-based compensation | 997 | 1,121 |
Change in value of Convertible Debentures | (465) | 1,436 |
Change in value of warrant liabilities | (1,146) | 732 |
Accretion of asset retirement obligation | 478 | 513 | $ 1,931
Unrealized foreign exchange loss | (394) | (500) |
Impairment of inventories | 1,078 | 1,176 |
Other non-cash expenses | 795 | 90 |
Changes in assets and liabilities |  |  |
Increase in inventories | (2,122) | (3,252) |
Decrease in trade and other receivables | 37 | 329 |
(Increase) decrease in prepaid expenses and other assets | (495) | 154 |
Decrease in accounts payable and accrued liabilities | (2,510) | (2,031) |
Changes in deferred revenue | 0 | (501) |
Net cash (used in) provided by operating activities | (8,324) | (11,553) |
INVESTING ACTIVITIES |  |  |
Maturities and sales of marketable securities | 2,200 | 9,950 |
Net cash (used in) provided by investing activities | 2,200 | 9,950 |
FINANCING ACTIVITIES |  |  |
Issuance of common shares for cash, net of issuance cost | 19,095 | 2,409 |
Proceeds from notes payable | (415) | 0 |
Repayment of loans and borrowings | (241) | 0 |
Cash received from exercise of stock options | 0 | 102 |
Cash received from non-controlling interest | 133 | 0 |
Net cash (used in) provided by financing activities | 18,572 | 2,511 |
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH DURING THE PERIOD | 12,448 | 908 |
Effect of exchange rate fluctuations on cash held in foreign currencies | (1,676) | (208) |
Cash, cash equivalents and restricted cash - beginning of period | 32,891 | 34,292 | 34,292
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - END OF PERIOD | 43,663 | 34,992 | $ 32,891
Supplemental disclosure of cash flow information: |  |  |
Interest | $ 22 | $ 0 |

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