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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Total
Common Stock
Deficit
Accumulated other comprehensive income
Total shareholders' equity
Non-controlling interests
At The Market Sale Of Stock
At The Market Sale Of Stock
Common Stock
Beginning Balance (in shares) at Dec. 31, 2014   19,677,552            
Beginning Balance at Dec. 31, 2014 $ 100,811 $ 260,117 $ (159,891) $ 585 $ 100,811 $ 0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (82,357)   (82,217)   (82,217) (140)    
Other comprehensive income $ 2,920     2,920 2,920      
Shares issued for exercise of stock options (in shares) 48,802 48,802            
Shares issued for consulting services $ 185 $ 185     185      
Shares issued for exercise of share purchase warrants (in shares) 173 300            
Shares issued for exercise of share purchase warrants $ 2 $ 2     2      
Share-based compensation 1,099 $ 1,099     1,099      
Noncontrolling Interest, Period Increase (Decrease) 3,992         3,992    
Shares issued in connection with the acquisition of Uranerz Energy Corporation (in shares)   25,347,209            
Shares issued in connection with the acquisition of Uranerz Energy Corporation 105,673 $ 105,673     105,673      
Options issued in connection with the acquisition of Uranerz Energy Corporation (in shares)   0            
Options issued in connection with the acquisition of Uranerz Energy Corporation 3,681 $ 3,681     3,681      
Stock Issuance Costs (312) $ (312)     (312)      
Shares issued for cash by at-the-market offering (in shares)   1,275,908            
Sale of stock consideration received             $ 2,940  
Shares issued for cash by at-the-market offering $ 2,939 $ 2,939     2,939      
Share issued for property acquisitions (in shares) 13,654,488 169,361            
Share issued for property acquisitions $ 550              
Share issuance cost (550) $ (550)     (550)      
Contributions attributable to non-controlling interest 304         304    
Shares issued for consulting services 0              
Ending Balance (in shares) at Dec. 31, 2015   46,519,132            
Ending Balance at Dec. 31, 2015 139,487 $ 373,934 (242,108) 3,505 135,331 4,156    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (39,864)   (39,413)   (39,413) (451)    
Other comprehensive income $ (197)     (197) (197)      
Shares issued for exercise of stock options (in shares) 8,369 8,369            
Shares issued for consulting services $ 18 $ 18     18      
Shares issued for exercise of share purchase warrants (in shares) 0 138,608            
Shares issued for exercise of share purchase warrants $ 0 $ 0     0      
Share-based compensation   $ 2,657     2,657      
Shares issued in connection with the acquisition of Uranerz Energy Corporation (in shares)   200,225            
Shares issued in connection with the acquisition of Uranerz Energy Corporation 539 $ 539     539      
Options issued in connection with the acquisition of Uranerz Energy Corporation (in shares)   13,368,750            
Options issued in connection with the acquisition of Uranerz Energy Corporation 22,980 $ 22,980     22,980      
Stock Issuance Costs $ (2,330) $ (2,330)     (2,330)      
Sale of stock consideration received             540  
Share issued for property acquisitions (in shares) 0 4,551,284            
Share issued for property acquisitions $ 2,679 $ 2,679     2,679      
Share issuance cost (11,378) $ (11,378)     (11,378)      
Contributions attributable to non-controlling interest 37         37    
Shares issued for acquisition of 40% Roca Honda (in shares)   1,212,173            
Shares issued for consulting services (in shares)   206,612            
Shares issued for consulting services 479 $ 479     479      
Ending Balance (in shares) at Dec. 31, 2016   66,205,153            
Ending Balance at Dec. 31, 2016 137,863 $ 412,334 (281,521) 3,308 134,121 3,742    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (27,990)   (27,766)   (27,766) (224)    
Other comprehensive income $ (1,019)     (1,019) (1,019)      
Shares issued for exercise of stock options (in shares) 0 206,612            
Shares issued for consulting services $ 370 $ 370     370      
Shares issued for exercise of share purchase warrants (in shares) 0              
Share-based compensation $ 3,525 3,525     3,525      
Stock Issuance Costs 394 $ 394     394      
Shares issued for cash by at-the-market offering (in shares)               7,202,479
Sale of stock consideration received             $ 14,550  
Shares issued for cash by at-the-market offering $ 14,548       14,548      
Share issued for property acquisitions (in shares) 0              
Contributions attributable to non-controlling interest $ 365         365    
Shares issued for public offering (in shares)   752,580            
Shares issued for the vesting of restricted stock units 0 $ 0     0      
Shares issued for consulting services 370              
Ending Balance (in shares) at Dec. 31, 2017   74,366,824            
Ending Balance at Dec. 31, 2017 $ 127,268 $ 430,383 $ (309,287) $ 2,289 $ 123,385 $ 3,883