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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Statement of Cash Flows [Abstract]              
Net loss for the period $ (8,190) $ (5,664) $ (9,314) $ (12,134) $ (13,854) $ (21,448)  
Items not involving cash:              
Depletion, depreciation and amortization         1,104 625  
Share-based compensation         1,701 1,784  
Change in value of Convertible Debentures 465   (943)   0 493  
Change in value of warrant liabilities         92 (1,115)  
Accretion of asset retirement obligation 478   481   956 994 $ 1,931
Unrealized foreign exchange (gain) loss         706 216  
Impairment of inventories 430   4,910   1,506 6,082  
Revision of asset retirement obligation         0 151  
Other non-cash expenses         647 974  
Changes in assets and liabilities              
Increase in inventories         (4,765) (7,079)  
Decrease in trade and other receivables         401 343  
Decrease in prepaid expenses and other assets         188 541  
Decrease in accounts payable and accrued liabilities         (3,100) (2,397)  
Changes in deferred revenue         0 (2,724)  
Net cash (used in) provided by operating activities         (15,830) (22,992)  
INVESTING ACTIVITIES              
Purchase of mineral properties and property, plant and equipment         (152) 0  
Maturities and sales of marketable securities         3,203 16,116  
Net cash (used in) provided by investing activities         3,051 16,116  
FINANCING ACTIVITIES              
Issuance of common shares for cash, net of issuance cost         27,862 8,853  
Cash paid to fund employee income tax withholding due upon vesting of restricted stock units         (415) 0  
Repayment of loans and borrowings         484 0  
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         27,096 9,050  
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH DURING THE PERIOD         14,317 2,174  
Effect of exchange rate fluctuations on cash held in foreign currencies         (336) 110  
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 $ 46,872   $ 36,576   46,872 36,576 $ 32,891
Supplemental disclosure of cash flow information:              
Interest         695 691  
Warrant liability transferred to equity upon exercise         $ 0 $ 2