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Warrants - Summary of Warrants Outstanding and Exercisable (Details) - $ / shares | Dec. 31, 2019 | Sep. 30, 2019
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Series B Convertible Preferred Warrants Exercise Price $16.60 |  |
Class Of Warrant Or Right [Line Items] |  |
Number of warrants outstanding | 54,396 | 54,396
Warrants exercise price, outstanding | $ 16.60 | $ 16.60
Number of warrants exercisable | 54,396 | 54,396
Warrants exercise price, exercisable | $ 16.60 | $ 16.60
Series B Convertible Preferred Warrants Exercise Price $16.80 |  |
Class Of Warrant Or Right [Line Items] |  |
Number of warrants outstanding | 17,857 | 17,857
Warrants exercise price, outstanding | $ 16.80 | $ 16.80
Number of warrants exercisable | 17,857 | 17,857
Warrants exercise price, exercisable | $ 16.80 | $ 16.80
Series B Convertible Preferred Warrants Exercise Price $24.30 |  |
Class Of Warrant Or Right [Line Items] |  |
Number of warrants outstanding | 12,383 | 12,383
Warrants exercise price, outstanding | $ 24.30 | $ 24.30
Number of warrants exercisable | 12,383 | 12,383
Warrants exercise price, exercisable | $ 24.30 | $ 24.30
Series B Convertible Preferred Warrants Exercise Price $28.50 |  |
Class Of Warrant Or Right [Line Items] |  |
Number of warrants outstanding | 33,393 | 33,393
Warrants exercise price, outstanding | $ 28.50 | $ 28.50
Number of warrants exercisable | 33,393 | 33,393
Warrants exercise price, exercisable | $ 28.50 | $ 28.50
Series B Convertible Preferred Stock Warrants |  |
Class Of Warrant Or Right [Line Items] |  |
Number of warrants outstanding | 118,029 | 118,029
Number of warrants exercisable | 118,029 | 118,029

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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