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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Detail) | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |
At U.S. federal statutory rate | 34.00% | 34.00%
State taxes, net of federal effect | 4.90% | 9.00%
Stock compensation | (5.80%) | (1.10%)
Mark-to-market adjustments | 0.90% | (0.10%)
Valuation allowance | (23.10%) | (41.10%)
True-up on deferred taxes | (3.00%) |
State blended rate change | (5.70%) |
Other | (2.20%) | (0.70%)
Effective income tax rate | 0.00% | 0.00%

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