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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss )
Accumulated Deficit
Beginning Balances at Dec. 31, 2009 $ 6,376 $ 54 $ 266,127 $ (168) $ (259,637)
Beginning Balances (in shares) at Dec. 31, 2009   54,279      
Issuance of common stock upon exercise of stock options and restricted stock awards (In Shares)   141      
Issuance of common stock upon exercise of stock options and restricted stock awards 160 1 159    
Issuance of common stock under Employee Stock Purchase Plan (in shares)   121      
Issuance of common stock under Employee Stock Purchase Plan 72   72    
Proceeds from issuances of common stock and warrants, net of issuance costs (in shares)   59,994      
Proceeds from issuances of common stock and warrants, net of issuance costs 87,399 59 87,340    
Reclassification of the warrant liability to Holdings into equity and the impact of the anti-dilution provision associated with the common stock and warrants issued to Holdings (in shares)   1,076      
Reclassification of the warrant liability to Holdings into equity and the impact of the anti-dilution provision associated with the common stock and warrants issued to Holdings 13,580 2 13,578    
Stock compensation expense 2,410   2,410    
Total comprehensive income (loss) (578)     (578)  
Net loss (57,308)       (57,308)
Ending Balances at Dec. 31, 2010 52,111 116 369,686 (746) (316,945)
Ending Balances (in shares) at Dec. 31, 2010   115,611      
Issuance of common stock upon exercise of stock options and restricted stock awards (In Shares)   308      
Issuance of common stock upon exercise of stock options and restricted stock awards 10   10    
Issuance of common stock under Employee Stock Purchase Plan (in shares)   106      
Issuance of common stock under Employee Stock Purchase Plan 132   132    
Proceeds from issuances of common stock and warrants, net of issuance costs (in shares)   38,601      
Proceeds from issuances of common stock and warrants, net of issuance costs 91,298 39 91,259    
Stock compensation expense 5,189   5,189    
Total comprehensive income (loss) (263)     (263)  
Net loss (48,597)       (48,597)
Ending Balances at Dec. 31, 2011 99,880 155 466,276 (1,009) (365,542)
Ending Balances (in shares) at Dec. 31, 2011   154,626      
Issuance of common stock upon exercise of stock options and restricted stock awards (In Shares)   1,222      
Issuance of common stock upon exercise of stock options and restricted stock awards 1,955 1 1,954    
Issuance of common stock under Employee Stock Purchase Plan (in shares)   141      
Issuance of common stock under Employee Stock Purchase Plan 307   307    
Proceeds from issuances of common stock and warrants, net of issuance costs (in shares)   26,803      
Proceeds from issuances of common stock and warrants, net of issuance costs 71,780 27 71,753    
Stock compensation expense 10,439   10,439    
Total comprehensive income (loss) 414     414  
Net loss (69,949)       (69,949)
Ending Balances at Dec. 31, 2012 $ 114,826 $ 183 $ 550,729 $ (595) $ (435,491)
Ending Balances (in shares) at Dec. 31, 2012   182,792