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Statements of Stockholders' Equity (USD $)
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Beginning Balance at Sep. 30, 2010 $ 1,001,459 $ 17,816 $ 16,477,981 $ (15,494,338)  
Beginning Balance, shares at Sep. 30, 2010   17,816,249      
Conversion of debentures 1,063,926 1,419 1,062,507    
Conversion of debentures, shares   1,418,573      
Issuance of common stock, net of issuance costs 14,595,366 3,357 14,592,009    
Issuance of common stock, shares   3,357,143      
Exercise of stock options 220,297 894 219,403    
Exercise of stock options, shares 942,639 895,287      
Exercise of warrants 37,917 658 37,259    
Exercise of warrants, shares   657,114      
Stock-based compensation expense 1,271,238   1,271,238    
Components of comprehensive income:          
Net loss (125,057)     (125,057)  
Change in unrealized gain on investments (9,855)       (9,855)
Total comprehensive loss (134,912)        
Ending Balance at Sep. 30, 2011 18,055,291 24,144 33,660,397 (15,619,395) (9,855)
Ending Balance, shares at Sep. 30, 2011   24,144,366      
Exercise of stock options 732,287 1,740 730,547    
Exercise of stock options, shares 1,812,215 1,739,924      
Exercise of warrants   111 (111)    
Exercise of warrants, shares   110,926      
Stock-based compensation expense 2,599,858   2,599,858    
Components of comprehensive income:          
Net loss (7,839,996)     (7,839,996)  
Change in unrealized gain on investments 9,239       9,239
Total comprehensive loss (7,830,757)        
Ending Balance at Sep. 30, 2012 13,556,679 25,995 36,990,691 (23,459,391) (616)
Ending Balance, shares at Sep. 30, 2012 25,995,216 25,995,216      
Issuance of common stock, net of issuance costs 16,004,797 3,286 16,001,511    
Issuance of common stock, shares   3,285,713      
Exercise of stock options 714,469 1,043 713,426    
Exercise of stock options, shares 1,103,582 1,042,872      
Settlement of restricted stock units (65,813) 37 (65,850)    
Settlement of restricted stock units, shares   37,641      
Stock-based compensation expense 2,791,862   2,791,862    
Components of comprehensive income:          
Net loss (7,275,706)     (7,275,706)  
Change in unrealized gain on investments 2,454       2,454
Total comprehensive loss (7,273,252)        
Ending Balance at Sep. 30, 2013 $ 25,728,742 $ 30,361 $ 56,431,640 $ (30,735,097) $ 1,838
Ending Balance, shares at Sep. 30, 2013 30,361,442 30,361,442