Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Potentially dilutive securities outstanding (Details)

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Significant Accounting Policies - Potentially dilutive securities outstanding (Details) - shares
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Significant Accounting Policies      
Common stock purchase options 6,506,966 3,337,406 6,375,966
Unvested restricted stock 3,125 1,433,472 6,875
Common stock purchase warrants 715,939 101,847 728,439
Convertible notes 0 638,138  
Antidilutive securities excluded from computation of earnings per share 7,226,030 5,510,863