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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
Share data in Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Comprehensive Income (Loss)
Balance at Dec. 31, 2008 $ 81,888,000 $ 317,000 $ 115,780,000 $ 280,000 $ (34,489,000)  
Balance (in shares) at Dec. 31, 2008   31,630        
Increase (Decrease) in Stockholders' Equity            
Issuance of Common Stock for exercise of options, employee stock purchase plans and release of awards 40,000   40,000      
Issuance of Common Stock for exercise of options, employee stock purchase plans and release of awards (in shares)   26        
Repurchase of Restricted Common Stock (8,000) (1,000) (7,000)      
Repurchase of Restricted Common Stock (in shares)   (3)        
Repurchase of Common Stock (930,000) (4,000) (926,000)      
Repurchase of Common Stock (in shares)   (429)        
Stock-based compensation 3,054,000   3,054,000      
Other comprehensive loss-change in unrealized gain on available-for-sale investments (239,000)     (239,000)   (239,000)
Net income (loss) (19,104,000)       (19,104,000) (19,104,000)
Comprehensive income (loss)           (19,343,000)
Balance at Dec. 31, 2009 64,701,000 312,000 117,941,000 41,000 (53,593,000)  
Balance (in shares) at Dec. 31, 2009   31,224        
Increase (Decrease) in Stockholders' Equity            
Issuance of Common Stock for exercise of options, employee stock purchase plans and release of awards 2,191,000 10,000 2,181,000      
Issuance of Common Stock for exercise of options, employee stock purchase plans and release of awards (in shares)   1,046        
Issuance of Common Stock, net of costs of $46 19,966,000 50,000 19,916,000      
Issuance of Common Stock, net of costs (in shares)   4,955        
Stock-based compensation 3,298,000   3,298,000      
Other comprehensive loss-change in unrealized gain on available-for-sale investments (37,000)     (37,000)   (37,000)
Net income (loss) (23,062,000)       (23,062,000) (23,062,000)
Comprehensive income (loss)           (23,099,000)
Balance at Dec. 31, 2010 67,057,000 372,000 143,336,000 4,000 (76,655,000)  
Balance (in shares) at Dec. 31, 2010 37,225 37,225        
Increase (Decrease) in Stockholders' Equity            
Issuance of Common Stock for exercise of options, employee stock purchase plans and release of awards 3,403,000 12,000 3,391,000      
Issuance of Common Stock for exercise of options, employee stock purchase plans and release of awards (in shares)   1,198        
Stock-based compensation 3,780,000   3,780,000      
Other comprehensive loss-change in unrealized gain on available-for-sale investments (3,000)     (3,000)   (3,000)
Net income (loss) 11,256,000       11,256,000 11,256,000
Comprehensive income (loss)           11,253,000
Balance at Dec. 31, 2011 $ 85,493,000 $ 384,000 $ 150,507,000 $ 1,000 $ (65,399,000)  
Balance (in shares) at Dec. 31, 2011 38,423 38,423