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Condensed Consolidated Statement of Changes in Stockholders' Deficit - 9 months ended Sep. 30, 2017 - USD ($)
$ in Thousands
Total
Preferred Shares
Common Shares
Treasury Stock
Additional Paid-in Capital
Accumulated Deficit
Balance at Dec. 31, 2016 $ (9,058) $ 24,364 $ 207,166 $ (1,498) $ 964,914 $ (1,204,004)
Balance (in shares) at Dec. 31, 2016   328,184,640 270,183,201 (819,505)    
Exercise of stock options $ 451   $ 164   287  
Exercise of stock options (in shares) 259,195   259,195      
Vesting of restricted stock units $ (2,593)   $ 1,312 $ (2,556) (1,349)  
Vesting of restricted stock units (in shares)     2,088,249 (833,911)    
Stock-based compensation 10,491       10,491  
Loss for the period (45,400)         (45,400)
Balance at Sep. 30, 2017 $ (46,109) $ 24,364 $ 208,642 $ (4,054) $ 974,343 $ (1,249,404)
Balance (in shares) at Sep. 30, 2017   328,184,640 272,530,645 (1,653,416)