Significant Accounting Policies - Potentially dilutive securities outstanding (Details) - shares |
9 Months Ended | |
|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share (in shares) | 8,392,778 | 7,833,360 |
| Common stock purchase options | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share (in shares) | 8,212,778 | 7,002,421 |
| Restricted stock units | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share (in shares) | 10,000 | |
| Common stock purchase warrants | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Antidilutive securities excluded from computation of earnings per share (in shares) | 180,000 | 820,939 |