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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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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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