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CAPITAL STOCK - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Aug. 14, 2018
Sep. 20, 2016
Jun. 16, 2016
May 27, 2016
Mar. 14, 2016
Jun. 18, 2015
Dec. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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)               74,366,824 66,205,153 46,519,132
Shares issued for consulting services (in shares)               122,854 0 0
Value assigned of equity interest issued               $ 569 $ 370 $ 479
Share Purchase Warrants Denominated in United States Dollars                    
Class of Warrant or Right [Line Items]                    
Fair value of warrants               $ 6,283    
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               $ 662    
Number of warrants outstanding (in shares)               2,328,925    
Nichols Ranch, Hank and Doughstick Properties                    
Class of Warrant or Right [Line Items]                    
Number of shares issued for acquisition (in shares) 1,100,000                  
Total purchase price $ 3,740                  
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              
Total purchase price     $ 12,668              
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]                    
Total purchase price           $ 106,340        
Percentage of voting interests acquired           100.00%        
Value assigned of equity interest issued           $ 106,340        
Shares issued for consulting services (in shares)             889,436      
Value assigned of equity interest issued             $ 3,930      
At The Market Sale Of Stock                    
Class of Warrant or Right [Line Items]                    
Sale of stock, number of shares issued (in shares)               14,283,254   200,225
Sale of stock consideration received               $ 32,190 $ 14,550 $ 540
Public Offerings                    
Class of Warrant or Right [Line Items]                    
Sale of stock, number of shares issued (in shares)         5,031,250     7,576,288 3,822,561 6,538,038
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                
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 consulting services (in shares)               0   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