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Warrants - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Fair value adjustment of warrants |  |  | $ 0 | $ 368,000 |
Series B Convertible Preferred Stock Warrants |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Warrants additional extended expiration period |  |  | 2 years |  |
Fair value adjustment of warrants | $ 0 | $ 102,000 | $ 0 | $ 368,000 |
Series B Convertible Preferred Stock Warrants | Series B Convertible Preferred Stock |  |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |  |
Number of warrants outstanding |  |  |  |  | 118,029
Warrants exercise price |  |  |  |  | $ 20.80

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- Definition Class of warrant or right outstanding and exercisable. + References No definition available. + Details
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- Definition Weighted average exercise price of warrants outstanding and exercisable. + References No definition available. + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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