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Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
Stockholders' Equity
Beginning Balance, value at Dec. 31, 2008 $ 309 $ 138,383 $ (131,051) $ (43) $ 7,598
Beginning Balance, Shares at Dec. 31, 2008 30,941,000        
Net loss     (10,028)   (10,028)
Net unrealized gain on marketable securities       43 43
Comprehensive loss         (9,985)
Common stock and warrants issued in private placement, net of issuance costs, shares 7,955,000        
Common stock and warrants issued in private placement, net of issuance costs,value 80 7,871     7,951
Fair value of stock-based compensation for restricted stock awards issued to directors, shares 332,000        
Fair value of stock-based compensation for restricted stock awards issued to directors, value 4 371     375
Common stock issued upon exercise of stock options, shares 28,000        
Common stock issued upon exercise of stock options, value   20     20
Common stock issued to employees under ESPP, shares 99,000        
Common stock issued to employees under ESPP, value 1 41     42
Stock issued in lieu of bonus, shares 40,000        
Stock issued in lieu of bonus, value   36     36
Stock-based compensation expense related to stock options and ESPP   759     759
Ending Balance, value at Dec. 31, 2009 394 147,481 (141,079)   6,796
Ending Balance, shares at Dec. 31, 2009 39,395,000        
Net loss     (7,346)   (7,346)
Comprehensive loss         (7,346)
Common stock and warrants issued in private placement, net of issuance costs,value   40     40
Fair value of stock-based compensation for restricted stock awards issued to directors, shares 661,000        
Fair value of stock-based compensation for restricted stock awards issued to directors, value 7 378     385
Common stock issued upon exercise of stock options, shares 38,000        
Common stock issued upon exercise of stock options, value   47     47
Common stock issued to employees under ESPP, shares 49,000        
Common stock issued to employees under ESPP, value   30     30
Stock-based compensation expense related to stock options and ESPP   1,364     1,364
Ending Balance, value at Dec. 31, 2010 401 149,340 (148,425)   1,316
Ending Balance, shares at Dec. 31, 2010 40,143,000        
Net loss     (11,814)   (11,814)
Comprehensive loss         (11,814)
Common stock and warrants issued in private placement, net of issuance costs, shares 160,000,000        
Common stock and warrants issued in private placement, net of issuance costs,value 1,600 21,172     22,772
Fair value of stock-based compensation for restricted stock awards issued/(canceled) to directors, shares (175,000)        
Fair value of stock-based compensation for restricted stock awards issued/(canceled) to directors, value   98     98
Common stock issued to employees under ESPP, shares 78,000        
Common stock issued to employees under ESPP, value 1 15     16
Conversion benefit included in convertible notes issued   1,573     1,573
Stock-based compensation expense related to stock options and ESPP   1,761     1,761
Fair value of warrants issued to non-employee   30     30
Ending Balance, value at Dec. 31, 2011 $ 2,002 $ 173,989 $ (160,239)   $ 15,752
Ending Balance, shares at Dec. 31, 2011 200,046,000