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Statements of Stockholders' Equity (USD $)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Beginning Balance at Dec. 31, 2008 $ 3,230 $ 54,588,192 $ (42,917,097) $ 11,674,325
Beginning Balance (in shares) at Dec. 31, 2008 3,229,916      
Issuance of common stock and warrants 557 884,171   884,728
Issuance of common stock and warrants (in shares) 556,786      
Exercise of warrants 1 (1)    
Exercise of warrants (in shares) 705      
Exercise of stock options 1 2,664   2,665
Exercise of stock options (in shares) 1,360 0    
Stock-based compensation   715,086   715,086
Net loss     (7,888,804) (7,888,804)
Ending Balance at Dec. 31, 2009 3,789 56,190,112 (50,805,901) 5,388,000
Ending Balance (in shares) at Dec. 31, 2009 3,788,767      
Exercise of warrants (in shares) 273      
Exercise of stock options 13 27,803   27,816
Exercise of stock options (in shares) 12,951      
Stock-based compensation   676,554   676,554
Issuance of warrants in conjunction with senior convertible note financing   386,048   386,048
Beneficial conversion feature associated with senior convertible note financing   390,548   390,548
Net loss     (3,975,837) (3,975,837)
Ending Balance at Dec. 31, 2010 3,802 57,671,065 (54,781,738) 2,893,129
Ending Balance (in shares) at Dec. 31, 2010 3,801,991      
Exercise of warrants 12 21,846   21,858
Exercise of warrants (in shares) 12,143      
Exercise of stock options 15 29,724   29,739
Exercise of stock options (in shares) 14,451      
Stock-based compensation   723,199   723,199
Conversion of senior convertible note and accrued interest to common stock 721 1,105,398   1,106,119
Conversion of senior convertible note and accrued interest to common stock (in shares) 721,009      
Beneficial conversion feature associated with senior convertible note financing   273,904   273,904
Common stock issuance for settlement of accounts payable 282 499,716   499,998
Common stock issuance for settlement of accounts payable (in shares) 282,485      
Net loss     (2,422,361) (2,422,361)
Ending Balance at Dec. 31, 2011 $ 4,832 $ 60,324,852 $ (57,204,099) $ 3,125,585
Ending Balance (in shares) at Dec. 31, 2011 4,832,079