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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