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Income Taxes (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
State income tax, net of federal benefit |  |  | (7.70%) | (6.50%)
Warrant expense |  |  | 9.40% | 10.60%
Disqualified interest and other |  |  | 1.00% | 0.90%
Research credits |  |  | (1.50%) | (1.20%)
U.S. tax reform |  |  |  | 8.30%
Valuation allowance |  |  | 19.80% | 21.90%
Effective tax rate | 0.00% | 0.00% |  |

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