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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Revenues $ 31,721 $ 31,046 $ 54,552
Cost of Revenue, Uranium Concentrates 14,752 14,676 35,315
Revenues, Uranium Concentrates 30,789 24,467 54,432
Uranium concentrates 14,752 19,405 35,453
Cost of Revenue, Alternate Feed Materials and Other 0 4,729 138
Revenues, Alternate Feed Materials Processing and Other 932 6,579 120
Impairment of inventories 4,579 3,305 5,362
Development, permitting and land holding 9,912 8,821 21,118
Standby costs 5,112 3,659 10,234
Abandonment of mineral properties 0 287 1,036
Impairment of assets to be abandoned of 0    
Accretion of asset retirement obligation 1,835 1,733 906
Selling costs 183 275 379
Intangible asset amortization 2,502 3,297 3,319
General and administration 14,158 14,923 15,519
Impairment of plant and equipment and mineral properties 3,622 0 0
Total operating loss (21,312) (28,458) (38,774)
Interest expense (1,722) (2,101) (2,289)
Other income (expense) (2,328) 2,569 1,199
Income tax expense 0 0 0
Net loss (25,362) (27,990) (39,864)
Items that may be reclassified in the future to profit and loss      
Foreign currency translation adjustment 1,554 (1,049) (729)
Unrealized gain on available-for-sale assets 0 30 532
Other comprehensive income (loss) 1,554 (1,019) (197)
Comprehensive loss (23,808) (29,009) (40,061)
Net loss attributable to:      
Owners of the Company (25,245) (27,766) (39,413)
Non-controlling interests (117) (224) (451)
Net loss (25,362) (27,990) (39,864)
Comprehensive loss attributable to:      
Owners of the Company (23,691) (28,785) (39,610)
Non-controlling interests (117) (224) (451)
Comprehensive loss $ (23,808) $ (29,009) $ (40,061)
Basic and diluted loss per share (Note 8) (in USD per share) $ (0.30) $ (0.39) $ (0.70)