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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 |  |  |

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