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Warrants - Additional Information (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 16, 2018 | Dec. 27, 2016 | Sep. 30, 2020 | Sep. 30, 2019
Class Of Warrant Or Right [Line Items] |  |  |  |
Stock based compensation expense |  |  | $ 86 | $ 142
Series B Convertible Preferred Stock Warrants |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Number of common shares into which each warrant may be exchanged |  |  | 5 |
Warrants additional extended expiration period | 2 years |  |  |
Stock based compensation expense |  |  | $ 462 | $ 128
Series B Convertible Preferred Warrants Expires on September 10, 2017 |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Number of warrants outstanding |  | 10,914 |  |
Expiration date |  | Sep. 10, 2017 |  |
Series B Convertible Preferred Warrants Expires on December 11, 2017 |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Number of warrants outstanding |  | 12,383 |  |
Expiration date |  | Dec. 11, 2017 |  |
Series B Convertible Preferred Warrants Expires on March 27, 2018 |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Number of warrants outstanding |  | 54,396 |  |
Expiration date |  | Mar. 27, 2018 |  |
Series B Convertible Preferred Warrants Expires on March 28, 2018 |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Number of warrants outstanding |  | 17,857 |  |
Expiration date |  | Mar. 28, 2018 |  |
Series B Convertible Preferred Warrants Expires on December 3, 2019 |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Number of warrants outstanding |  |  | 22,479 |
Expiration date |  |  | Dec. 03, 2019 |

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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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