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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, 2011 $ 18,055,291 $ 24,144 $ 33,660,397 $ (15,619,395) $ (9,855)
Beginning 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 (loss) 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      
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 (loss) 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      
Exercise of stock options 118,754 105 118,649    
Exercise of stock options, shares 108,135 105,280      
Settlement of restricted stock units (48,426) 55 (48,481)    
Settlement of restricted stock units, shares   54,358      
Stock-based compensation expense 3,444,480   3,444,480    
Components of comprehensive income:          
Net loss (5,291,869)     (5,291,869)  
Change in unrealized gain (loss) on investments (9,648)       (9,648)
Total comprehensive loss (5,301,517)        
Ending Balance at Sep. 30, 2014 $ 23,942,033 $ 30,521 $ 59,946,288 $ (36,026,966) $ (7,810)
Ending Balance, shares at Sep. 30, 2014 30,521,080 30,521,080