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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2009 $ 211,155 $ 31 $ 416,579 $ (25,000) $ (180,470) $ 15
Beginning Balance, shares at Dec. 31, 2009   31,092        
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan 1,491 1 1,490      
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan, shares   760        
Net tax effect from stock options exercised (270)   (270)      
Share-based compensation 6,471   6,471      
Net loss (33,450)       (33,450)  
Other comprehensive income (loss) 6         6
Ending Balance at Dec. 31, 2010 185,403 32 424,270 (25,000) (213,920) 21
Ending Balance, shares at Dec. 31, 2010   31,852        
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan 504   504      
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan, shares   410        
Net tax effect from stock options exercised (244)   (244)      
Taxes withheld on net settled vesting of restricted stock units (700)   (700)      
Share-based compensation 5,983   5,983      
Net loss (24,892)       (24,892)  
Other comprehensive income (loss) (29)         (29)
Ending Balance at Dec. 31, 2011 166,025 32 429,813 (25,000) (238,812) (8)
Ending Balance, shares at Dec. 31, 2011   32,262        
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan 1,599 2 1,597      
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan, shares   1,393        
Taxes withheld on net settled vesting of restricted stock units (433)   (433)      
Share-based compensation 7,500   7,500      
Net loss (89,266)       (89,266)  
Other comprehensive income (loss) 22         22
Ending Balance at Dec. 31, 2012 $ 85,447 $ 34 $ 438,477 $ (25,000) $ (328,078) $ 14
Ending Balance, shares at Dec. 31, 2012   33,655