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Statements of Stockholders' Equity (USD $)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Beginning Balance at Dec. 31, 2009 $ 3,789 $ 56,190,112 $ (50,805,901) $ 5,388,000
Beginning Balance (in shares) at Dec. 31, 2009 3,788,767      
Exercise of warrants         
Exercise of warrants (in shares) 273      
Exercise of stock options 13 27,803   27,816
Exercise of stock options (in shares) 12,951     12,951
Stock-based compensation   676,554   676,554
Issuance of warrants in conjunction with senior convertible note financing   368,048   368,048
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     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      
Exercise of warrants 17 29,982   29,999
Exercise of warrants (in shares) 16,666      
Exercise of stock options 12 14,003   14,015
Exercise of stock options (in shares) 12,318     7,318
Stock-based compensation   597,668   597,668
Net loss     (3,298,082) (3,298,082)
Ending Balance at Dec. 31, 2012 $ 4,861 $ 60,966,505 $ (60,502,181) $ 469,185
Ending Balance (in shares) at Dec. 31, 2012 4,861,063