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Subsequent Events - Open Market Sale Agreement (Details) - Common Stock - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended | 13 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2023 | Jul. 31, 2023 | Apr. 30, 2023 | Jul. 31, 2022 | Apr. 30, 2022 | Jul. 31, 2023 | Jul. 31, 2023
Subsequent Event [Line Items] |  |  |  |  |  |  |
Stock issued during period shares new issues |  | 37,931,204 | 949,438 | 7,814,115 | 19,896,904 |  |
Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Average sale price per share |  |  |  |  |  |  | $ 2.67
Gross proceeds from issuance of common stock |  |  |  |  |  | $ 88.0 |
Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | 2022 Open Market Sale Agreement |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Shares sold during the period |  | 41,300,000 |  |  |  | 42,300,000 | 60,800,000
Stock issued during period shares new issues |  | 37,900,000 |  |  |  | 38,900,000 | 57,400,000
Average sale price per share |  | $ 2.24 |  |  |  | $ 2.26 | $ 2.67
Gross proceeds from issuance of common stock |  | $ 85.1 |  |  |  | $ 88.0 | $ 155.0
Net proceeds from issuance of common stock |  | 83.3 |  |  |  | 85.9 | 151.2
Payments of commissions |  | $ 1.8 |  |  |  | $ 2.1 | $ 3.8
Jefferies LLC, B. Riley Securities, Inc., Barclays Capital Inc., BMO Capital Markets Corp., BofA Securities, Inc., Canacord Genuity LLC, Citigroup Global Markets Inc., J.P. Morgan Securities LLC and Loop Capital Markets LLC | Subsequent Event [Member] | 2022 Open Market Sale Agreement |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Shares sold during the period | 2,000,000.0 |  |  |  |  |  |
Average sale price per share | $ 2.14 |  |  |  |  |  |
Gross proceeds from issuance of common stock | $ 4.3 |  |  |  |  |  |
Net proceeds from issuance of common stock | 4.2 |  |  |  |  |  |
Payments of commissions | $ 0.1 |  |  |  |  |  |

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