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SUPPLEMENTAL FINANCIAL INFORMATION (Tables)
 3 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedules of Components of Revenues
The components of revenues are as follows:
 
Three months ended
March 31,
 
2017
 
2016
Uranium concentrates
$
3,497

 
$
17,978

Alternate feed materials processing and other
259

 
18

Revenues
$
3,756

 
$
17,996
Schedule of Other Nonoperating Income (Expense)
The components of other income (expense) are as follows:
 
Three months ended
March 31,
 
2017
 
2016
Interest income
$
29

 
$
20

Change in value of investments accounted at fair value
499

 
69

Change in value of warrant liabilities
(2,193
)
 
253

Change in value of convertible debentures
(922
)
 
(561
)
Sale of surplus assets
793

 
—

Other
(123
)
 
307

Other income (expense)
$
(1,917
)
 
$
88