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Income Taxes - Components of the Net Deferred Tax (Liability) and Asset (Detail) - USD ($) | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Deferred tax assets: |  |
Accrued compensation | $ 1,337,619 | $ 1,691,050
Stock compensation | 5,670,468 | 7,224,958
Capitalized research and development | 2,196,542 | 2,957,528
Fixed Assets | 203,477 |
Net operating losses | 132,119,837 | 125,120,957
Intangible Assets | 5,358,700 | 5,544,091
Deferred Revenue | 1,068,206 |
Deferred Rent | 865,675 |
Capital Loss | 1,020,162 |
Total deferred tax assets | 149,840,686 | 142,538,584
Valuation allowance | (136,625,436) | (128,695,371)
Deferred tax liabilities: |  |
State taxes | (13,215,250) | (13,804,268)
Fixed assets |  | (38,945)
Total deferred tax liability | $ (13,215,250) | $ (13,843,213)

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