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CAPITAL STOCK - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 20, 2016
Jun. 16, 2016
May 27, 2016
Mar. 14, 2016
Jun. 25, 2015
Jun. 18, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]                    
Partners' capital account, units, sold in public offering (in shares) 8,337,500                  
Shares issued, price per share (in dollars per share) $ 1.80                  
Partners' capital account, units, sold in public offering, warrants per unit (in shares) 0.5                  
Common stock, shares, issued (in shares)             19,677,552 66,205,153 46,519,132 19,677,552
Value assigned of equity interest issued               $ 370 $ 479 $ 0
Share Purchase Warrants Denominated in United States Dollars                    
Class of Warrant or Right [Line Items]                    
Fair value of warrants               $ 3,376    
March 14, 2019 Expiration Date | Share Purchase Warrants Denominated in United States Dollars                    
Class of Warrant or Right [Line Items]                    
Exercise price of warrants (in dollars per share)               $ 3.20    
Fair value of warrants               $ 385    
Number of warrants outstanding (in shares)               2,515,625    
Roca Honda                    
Class of Warrant or Right [Line Items]                    
Number of shares issued for acquisition (in shares)     1,212,173              
Percentage of voting interests acquired     40.00%              
Value assigned of equity interest issued     $ 2,680              
Alta Mesa I S R Project                    
Class of Warrant or Right [Line Items]                    
Number of shares issued for acquisition (in shares)   4,551,284                
Percentage of voting interests acquired   100.00%                
Value assigned of equity interest issued   $ 11,380                
Uranerz Energy Corporation                    
Class of Warrant or Right [Line Items]                    
Number of shares issued for acquisition (in shares)           24,457,773        
Percentage of voting interests acquired           100.00%        
Value assigned of equity interest issued           $ 106,340        
Shares issued for consulting services (in shares)           617,832 889,436      
Value assigned of equity interest issued           $ 2,570 $ 3,930      
At The Market Sale Of Stock                    
Class of Warrant or Right [Line Items]                    
Sale of stock, number of shares issued (in shares)               200,225 1,275,908  
Sale of stock consideration received               $ 14,550 $ 540 $ 2,940
Public Offerings                    
Class of Warrant or Right [Line Items]                    
Sale of stock, number of shares issued (in shares)       5,031,250       3,822,561 6,538,038 28,821
Sale of stock consideration received $ 15,010     $ 12,080            
Equity issuance, per Share amount (in dollars per share)       $ 2.40            
Units issued during period, underlying shares (in shares)       5,031,250            
Units issued during period, underlying warrants (in shares)       2,515,625            
Investment warrants, exercise price (in dollars per share)       $ 3.20            
Warrants issued during period, value       $ 2,090            
Number of warrants granted in period (in shares)       2,515,625            
Partners' capital account, units, sold in public offering, common shares per unit (in shares) 1                  
Common stock, shares, issued (in shares) 8,337,500                  
Number of warrants issued (in shares) 4,168,750                  
Exercise price of warrants (in dollars per share) $ 2.45                  
Fair value of warrants $ 3,170                  
Former Uranerz Employees | Uranerz Energy Corporation                    
Class of Warrant or Right [Line Items]                    
Number of shares issued for acquisition (in shares)         271,604          
Value assigned of equity interest issued         $ 1,360          
Common Stock                    
Class of Warrant or Right [Line Items]                    
Number of shares issued for acquisition (in shares)           24,457,773        
Common Stock | Uranerz Energy Corporation                    
Class of Warrant or Right [Line Items]                    
Value assigned of equity interest issued           $ 101,744        
Common Stock                    
Class of Warrant or Right [Line Items]                    
Shares Issued For Cash By At The Market Offering Shares                   1,275,908
Shares issued for consulting services (in shares)                 206,612  
Value assigned of equity interest issued                 $ 479  
Common Stock | At The Market Sale Of Stock                    
Class of Warrant or Right [Line Items]                    
Shares Issued For Cash By At The Market Offering Shares               7,202,479