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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. 24, 2016
Mar. 14, 2016
Jun. 25, 2015
Jun. 18, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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)               46,519,132 66,205,153 46,519,132 19,677,552 19,601,251
Value assigned of equity interest issued                 $ 479 $ 0 $ 0  
Warrant, expiration date extension       1 year                
Share Purchase Warrants Denominated in United States Dollars                        
Class of Warrant or Right [Line Items]                        
Fair value of warrants                 $ 3,912      
January 25, 2017 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)                 $ 6.28      
Fair value of warrants                 $ 0      
Number of warrants outstanding (in shares)                 1,224,000      
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                 $ 807      
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                 $ 540 $ 2,940    
Public Offerings                        
Class of Warrant or Right [Line Items]                        
Sale of stock, number of shares issued (in shares)         5,031,250       6,538,038 28,821 0  
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