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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
Beginning Balance (in shares) at Dec. 31, 2016   66,205,153          
Beginning 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 loss $ (1,019)     (1,019) (1,019)    
Shares Issued For Cash By At The Market Offering Shares             7,202,479
Shares issued for exercise of stock options (in shares) 0 206,612          
Shares issued for consulting services $ 370 $ 370     370    
Effect of shares issued for conversion of Convertible Debentures 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 $ 14,548       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 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 loss $ 1,554     1,554 1,554    
Shares Issued For Cash By At The Market Offering Shares             14,283,254
Shares issued for exercise of stock options (in shares) 355,092            
Shares issued for consulting services $ 764 $ 764     764    
Effect of shares issued for conversion of Convertible Debentures 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    
Shares issued for cash by at-the-market offering 32,192       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 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            
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]              
Net loss (38,094)   (37,978)   (37,978) (116)  
Other comprehensive loss $ (854)     (854) (854)    
Shares Issued For Cash By At The Market Offering Shares             8,043,365
Shares issued for exercise of stock options (in shares) 54,805            
Shares issued for consulting services $ 146 $ 146     146    
Effect of shares issued for conversion of Convertible Debentures 0 266,272          
Shares issued for exercise of share purchase warrants $ 847 $ 847     847    
Share-based compensation 3,771 3,771     3,771    
Stock Issuance Costs (463) $ (463)     (463)    
Shares Issued for Consulting Services   74,781          
Adjustments to Additional Paid-in-Capital, Shares Issued For Consulting Services 208 $ 208     208    
Shares issued for cash by at-the-market offering 20,141       20,141   $ 20,141
Share issued for property acquisitions (in shares)   0          
Share issued for property acquisitions $ 0 $ 0     0    
Shares issued for the vesting of restricted stock units (in shares) 786,746 850,150          
Contributions attributable to non-controlling interest $ 46         46  
Shares issued for public offering (in shares)   54,805          
Shares issued for the vesting of restricted stock units $ 0 $ 0     0    
Shares issued for consulting services 46,067 0          
Shares issued for consulting services $ 208            
Stock Issued During Period, Value, Cash Payment for Tax Withholding $ 0 $ 0     0    
Stock Issued For Exercise Of Warrants 1,057 1,450          
Ending Balance (in shares) at Dec. 31, 2019   100,735,889          
Ending Balance at Dec. 31, 2019 $ 130,607 $ 493,958 $ (370,036) $ 2,989 126,911 $ 3,696  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adjustments to Additional Paid in Capital, Warrant Issued $ 5 $ 5     $ 5