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Condensed Consolidated Statements of Changes in Deficit (USD $)
In Thousands, except Share data
Total
Common Shares
Additional Paid-in Capital
Treasury stock
Accumulated Deficit
Beginning Balance at Dec. 31, 2011 $ (5,962) $ 113,321 $ 449,393 $ (217) $ (568,459)
Beginning Balance (in shares) at Dec. 31, 2011   135,832,542      
Exercise of warrants (in shares) 10,881,276 10,881,276      
Exercise of warrants 16,526 8,407 8,119    
Vesting of restricted stock units (in shares)   97,398      
Transfer of fair value of warrants exercised from liabilities to equity 103,885   103,885    
Vesting of restricted stock units   76 (76)    
Conversion option contained in exchangeable notes 22,898   22,898    
Exercise of stock options (in shares) 3,107,913 3,107,913      
Exercise of stock options 7,834 2,439 5,395    
Tax benefits realized from stock-based compensation 10,106   10,106    
Share issued for services (in shares)   2,293      
Shares issued for services 24 1 23    
Stock-based compensation 13,344   13,344    
Loss for the period (168,617)       (168,617)
Ending Balance at Sep. 30, 2012 38 124,244 613,087 (217) (737,076)
Ending Balance (in shares) at Sep. 30, 2012   149,921,422      
Beginning Balance at Dec. 31, 2012 (3,997) 124,597 619,266 (217) (747,643)
Beginning Balance (in shares) at Dec. 31, 2012   150,360,933      
Stock issued in equity financing (in shares)   21,700,000      
Stock issued in equity financing 121,206 16,401 104,805    
Exercise of warrants (in shares) 120,000 120,000      
Exercise of warrants 120 91 29    
Vesting of restricted stock units (in shares)   93,048      
Vesting of restricted stock units   71 (71)    
Exercise of stock options (in shares) 386,000 386,000      
Exercise of stock options 627 292 335    
Tax benefits realized from stock-based compensation 966   966    
Share issued for services (in shares)   4,032      
Shares issued for services 27 3 24    
Stock-based compensation 14,170   14,170    
Loss for the period (150,816)       (150,816)
Ending Balance at Sep. 30, 2013 $ (17,697) $ 141,455 $ 739,524 $ (217) $ (898,459)
Ending Balance (in shares) at Sep. 30, 2013   172,664,013