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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Income Taxes [Line Items] |  |
Net change in total valuation allowance | $ 1,968,988 | $ 2,247,615
Operating loss carryforwards, expiration start year | 2018 |
Net operating loss carryforwards will begin to expire | 2013 |
Research and development credits expiry period beginning year | 2023 |
Net operating loss carryforwards for state purposes | 35,164,486 |
Alternative minimum tax credit carryforwards | 66,320 | 66,320
Accrued interest | 0 |
Domestic [Member] |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards for state purposes | 66,320 |
Research and development credit carryforwards | 21,963 |
Alternative minimum tax credit carryforwards | 8,346 |
Stock Option [Member] |  |
Income Taxes [Line Items] |  |
Federal and state net operating losses | 45,392,347 |
Research and development credit [Member] |  |
Income Taxes [Line Items] |  |
Investment credit carryforwards | 17,654,877 |
Manufacturers' investment credit [Member] |  |
Income Taxes [Line Items] |  |
Investment credit carryforwards | $ 29,306 |

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