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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenues, Uranium Concentrates $ 66 $ 30,789 $ 24,467
Revenues, Vanadium Concentrates 2,237 0 0
Revenues, Alternate Feed Materials Processing and Other 3,562 932 6,579
Revenues 5,865 31,721 31,046
Cost of Revenue, Uranium Concentrates 63 14,752 14,676
Cost of Revenue, Applicable To Vanadium Concentrates 1,805 0 0
Cost of Revenue, Alternate Feed Materials and Other 2,079 0 4,729
Uranium concentrates 3,947 14,752 19,405
Impairment of inventories 14,351 4,579 3,305
Development, Permitting And Land Holding 9,180 9,912 8,821
Standby costs 2,584 5,112 3,659
Abandonment of mineral properties 0 0 287
Impairment of assets to be abandoned of 0 0 3,799
Accretion of asset retirement obligation 1,931 1,835 1,733
Selling costs 190 183 275
Intangible asset amortization 0 2,502 3,297
General and administration 14,263 14,158 14,923
Total operating loss (40,581) (21,312) (28,458)
Interest expense (1,491) (1,722) (2,101)
Other Nonoperating Income (Expense) 3,978 (2,328) 2,569
Net loss (38,094) (25,362) (27,990)
Items that may be reclassified in the future to profit and loss      
Foreign currency translation adjustment (854) 1,554 (1,049)
Unrealized gain on available-for-sale assets 0 0 30
Other comprehensive income (loss) (854) 1,554 (1,019)
Comprehensive loss (38,948) (23,808) (29,009)
Net loss attributable to:      
Owners of the Company (37,978) (25,245) (27,766)
Non-controlling interests (116) (117) (224)
Net loss (38,094) (25,362) (27,990)
Comprehensive loss attributable to:      
Owners of the Company (38,832) (23,691) (28,785)
Non-controlling interests (116) (117) (224)
Comprehensive loss $ (38,948) $ (23,808) $ (29,009)
Basic and diluted loss per share (Note 8) (in USD per share) $ (0.40) $ (0.30) $ (0.39)