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Condensed Consolidated Statement of Changes in Stockholders' Deficit - 3 months ended Mar. 31, 2017 - USD ($)
$ in Thousands
Total
Preferred Shares
Common Shares
Treasury Stock
Additional Paid-in Capital
Accumulated Deficit
Balance (in shares) at Dec. 31, 2016   328,184,640 270,183,201 (819,505)    
Balance at Dec. 31, 2016 $ (9,058) $ 24,364 $ 207,166 $ (1,498) $ 964,914 $ (1,204,004)
Exercise of stock options (in shares) 172,027   172,027      
Exercise of stock options $ 296   $ 107   189  
Vesting of restricted stock units (in shares)     1,906,374 (746,677)    
Vesting of restricted stock units (2,228)   $ 1,192 $ (2,228) (1,192)  
Stock-based compensation 3,162       3,162  
Loss for the period (20,941)         (20,941)
Balance (in shares) at Mar. 31, 2017   328,184,640 272,261,602 (1,566,182)    
Balance at Mar. 31, 2017 $ (28,769) $ 24,364 $ 208,465 $ (3,726) $ 967,073 $ (1,224,945)