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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income
Accumulated Deficit
Balance at Dec. 31, 2010 $ 67,057 $ 372 $ 143,336 $ 4 $ (76,655)
Balance (in shares) at Dec. 31, 2010   37,225      
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards 3,403 12 3,391    
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards (in shares)   1,198      
Stock-based compensation 3,780   3,780    
Other comprehensive income (loss)-change in unrealized gain (loss) on available-for-sale investments (3)     (3)  
Net income (loss) 11,256       11,256
Balance at Dec. 31, 2011 85,493 384 150,507 1 (65,399)
Balance (in shares) at Dec. 31, 2011   38,423      
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards 3,646 19 3,627    
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards (in shares)   1,881      
Repurchase of common stock (828) (2) (826)    
Repurchase of common stock (in shares)   (250)      
Stock-based compensation 3,835   3,835    
Other comprehensive income (loss)-change in unrealized gain (loss) on available-for-sale investments 10     10  
Net income (loss) (27,614)       (27,614)
Balance at Dec. 31, 2012 64,542 401 157,143 11 (93,013)
Balance (in shares) at Dec. 31, 2012 40,054 40,054      
Increase (Decrease) in Stockholders' Equity          
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards 4,224 13 4,211    
Issuance of common stock for exercise of options, employee stock purchase plan and release of awards (in shares)   1,365      
Issuance of common stock, net of costs of $2,154 27,746 75 27,671    
Issuance of common stock, net of costs of $2,154 (in shares)   7,475      
Stock-based compensation 3,698   3,698    
Other comprehensive income (loss)-change in unrealized gain (loss) on available-for-sale investments 2     2  
Net income (loss) (24,794)       (24,794)
Balance at Dec. 31, 2013 $ 75,418 $ 489 $ 192,723 $ 13 $ (117,807)
Balance (in shares) at Dec. 31, 2013 48,894 48,894