Stockholders' equity - Schedule of warrants or rights (Detail) - $ / shares |
3 Months Ended | |
|---|---|---|
Dec. 31, 2020 |
Sep. 30, 2020 |
|
| Equity [Abstract] | ||
| Outstanding, beginning of period | 107,095 | 145,421 |
| Granted | 559,162 | 0 |
| Exercised | (281,581) | 0 |
| Cashless exercise | 0 | (38,326) |
| Outstanding, ending of period | 384,676 | 107,095 |
| Exercise price of class of warrants or rights outstanding | $ 10.50 | $ 29.48 |
| Granted | 3.09 | 0 |
| Exercised | 3.10 | 0 |
| Cashless exercise | 0 | 82.50 |
| Exercise price of class of warrants or rights outstanding and excercisable | $ 5.15 | $ 10.50 |
| X | ||||||||||
- Definition Class of warrants or rights cashless exercise of warrants. No definition available.
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| X | ||||||||||
- Definition Class of warrants or rights excercised during the period. No definition available.
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| X | ||||||||||
- Definition Class of warrants or rights grants in period. No definition available.
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| X | ||||||||||
- Definition Weighted - average exercise price of class of warrants or exercised during the period. No definition available.
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| X | ||||||||||
- Definition Weighted-average exercise price of class of warrants or exercised during the period cash less exercise of warrants. No definition available.
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| X | ||||||||||
- Definition Weighted-average exercise price of class of warrants or granted during the period. No definition available.
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| X | ||||||||||
- Definition Weighted-average exercise price of class of warrants or rights outstanding. No definition available.
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| X | ||||||||||
- Definition Number of warrants or rights outstanding. No definition available.
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| X | ||||||||||
- References No definition available.
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