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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, 2015   46,519,132            
Beginning 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)   4,551,284            
Share issued for property acquisitions $ 2,679 $ 2,679     2,679      
Shares issued for the vesting of restricted stock units (in shares) 196,242              
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) 0 206,612            
Shares issued for consulting services $ 479 $ 479     479      
Stock Issued For Exercise Of Warrants 0              
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      
Shares issued for the vesting of restricted stock units (in shares) 831,393              
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 (in shares) 0              
Shares issued for consulting services $ 370              
Stock Issued For Exercise Of Warrants 0              
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    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Adjusted balance 129,742 430,383 (306,813) 2,289 125,859 3,883    
Net loss (25,362)   (25,245)   (25,245) (117)    
Other comprehensive income $ 1,554     1,554 1,554      
Shares issued for exercise of stock options (in shares) 355,092              
Shares issued for consulting services $ 764 $ 764     764      
Shares issued for exercise of share purchase warrants (in shares) 323 2,409            
Shares issued for exercise of share purchase warrants $ 8 $ 8     8      
Share-based compensation 2,762 2,762     2,762      
Stock Issuance Costs (922) $ (922)     (922)      
Shares Issued for Consulting Services   247,485            
Adjustments to Additional Paid-in-Capital, Shares Issued For Consulting Services 569 $ 569     569      
Sale of stock consideration received             $ 32,190  
Shares issued for cash by at-the-market offering 32,192       32,192      
Share issued for property acquisitions (in shares)   1,102,840            
Share issued for property acquisitions $ 3,739 $ 3,739     3,739      
Shares issued for the vesting of restricted stock units (in shares) 829,610 899,192            
Shares issued for public offering (in shares)   355,092            
Shares issued for the vesting of restricted stock units $ 0 $ 0     0      
Shares issued for consulting services (in shares) 122,854 0            
Shares issued for consulting services $ 569              
Stock Issued During Period, Value, Cash Payment for Tax Withholding $ (914) $ (914)     (914)      
Stock Issued For Exercise Of Warrants 44,185 187,970            
Ending Balance (in shares) at Dec. 31, 2018   91,445,066            
Ending Balance at Dec. 31, 2018 $ 144,854 $ 469,303 $ (332,058) $ 3,843 141,088 $ 3,766    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Adjustments to Additional Paid in Capital, Warrant Issued $ 722 $ 722     $ 722