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Consolidated Statements of Changes in Equity - 9 months ended Sep. 30, 2016 - USD ($)
$ in Thousands
Total
Common Stock
Deficit
Accumulated other comprehensive income
Total shareholders' equity
Non-controlling interests
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 (27,551)   (27,292)   (27,292) (259)
Other comprehensive income (923)     (923) (923)  
Shares issued for cash by at-the-market offering (in shares)   200,225        
Shares issued for cash by at-the-market offering (Note 7a) 539 $ 539     539  
Shares issued for public offering (in shares)   13,368,750        
Shares issued for public offering (Note 7b and 7e) 21,856 $ 21,856     21,856  
Share issuance cost (2,330) (2,330)     (2,330)  
Share-based compensation (Note 9) $ 1,688 $ 1,688     1,688  
Shares issued for exercise of stock options (in shares) 8,369 8,369        
Shares issued for exercise of stock options $ 18 $ 18     18  
Shares issued for the vesting of restricted stock units (in shares)   138,608        
Shares issued for acquistion of Alta Mesa (in shares)   4,551,284        
Shares issued for acquisition of Alta Mesa (Note 7d) 11,378 $ 11,378     11,378  
Shares issued for acquisition of 40% Roca Honda (in shares)   1,212,173        
Shares issued for acquisition of 40% interest in Roca Honda (Note 7c) 2,679 $ 2,679     2,679  
Shares issued for consulting services (in shares)   206,612        
Shares issued for consulting services 479 $ 479     479  
Contributions attributable to non-controlling interest 37         37
Ending Balance (in shares) at Sep. 30, 2016   66,205,153        
Ending Balance at Sep. 30, 2016 $ 147,357 $ 410,241 $ (269,400) $ 2,582 $ 143,423 $ 3,934