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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) 9,812,622 9,812,622      
Exercise of warrants 14,930 7,569 7,361    
Transfer of fair value of warrants exercised from liabilities to equity 92,282   92,282    
Conversion option contained in exchangeable notes 22,898   22,898    
Exercise of stock options (in shares) 2,485,647 2,485,647      
Exercise of stock options 6,678 1,953 4,725    
Tax benefits realized from stock-based compensation 7,960   7,960    
Share issuances for services (in shares)   1,742      
Shares issued for services 14 1 13    
Stock-based compensation 8,709   8,709    
Loss for the period (142,189)       (142,189)
Ending Balance at Jun. 30, 2012 5,320 122,844 593,341 (217) (710,648)
Ending Balance (in shares) at Jun. 30, 2012   148,132,553      
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      
Exercise of warrants (in shares) 70,000 70,000      
Exercise of warrants 70 52 18    
Exercise of stock options (in shares) 319,750 319,750      
Exercise of stock options 541 242 299    
Tax benefits realized from stock-based compensation 1,003   1,003    
Share issuances for services (in shares)   2,277      
Shares issued for services 18 2 16    
Stock-based compensation 9,963   9,963    
Loss for the period (101,932)       (101,932)
Ending Balance at Jun. 30, 2013 $ (94,334) $ 124,893 $ 630,565 $ (217) $ (849,575)
Ending Balance (in shares) at Jun. 30, 2013   150,752,960