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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
At U.S. federal statutory rate | 35.00% | 21.00% | 34.00%
State taxes, net of federal effect |  | 7.90% | 4.90%
Stock compensation |  | 2.60% | (5.80%)
Mark-to-market adjustments |  | 0.20% | 0.90%
Valuation allowance |  | 36.20% | (23.10%)
True-up on deferred taxes |  |  | (3.00%)
State blended rate change |  |  | (5.70%)
Federal tax rate change in 2018 |  | (67.90%) |
Other |  |  | (2.20%)
Effective income tax rate |  | 0.00% | 0.00%

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