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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%