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Nature of Business and Basis of Presentation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 11 Months Ended 14 Months Ended
Aug. 01, 2022
Jul. 12, 2022
May 01, 2022
Jun. 11, 2021
Jul. 31, 2022
Jul. 31, 2022
Apr. 30, 2022
Jul. 31, 2021
Jan. 31, 2021
Jul. 31, 2022
Apr. 30, 2022
Jul. 31, 2022
Oct. 31, 2021
Nature Of Business And Basis Of Presentation [Line Items]                          
Cash and cash equivalents, unrestricted         $ 456,479 $ 456,479       $ 456,479   $ 456,479 $ 432,213
Common Stock                          
Nature Of Business And Basis Of Presentation [Line Items]                          
Stock issued during period shares new issues           7,814,115 19,896,904 43,978,999 25,000,000        
Common Stock | 2022 Open Market Sale Agreement | 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                          
Nature Of Business And Basis Of Presentation [Line Items]                          
Average sale price per share         $ 3.63                
Stock issued during period shares new issues 10,700,000       18,500,000         7,800,000      
Payments of commissions $ 800                 $ 700      
Gross proceeds from issuance of common stock 39,200                 27,900      
Net proceeds from issuance of common stock $ 38,400                 $ 27,200      
Common Stock | 2022 Open Market Sale Agreement | 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 | Maximum                          
Nature Of Business And Basis Of Presentation [Line Items]                          
Aggregate number of shares to be offered   95,000,000.0                      
Stock issued during period shares new issues   95,000,000.0                      
Common Stock | 2021 Open Market Sale Agreement | Agents                          
Nature Of Business And Basis Of Presentation [Line Items]                          
Aggregate offering price       $ 500,000                  
Average sale price per share                       $ 7.79  
Stock issued during period shares new issues   0 0               64,000,000.0 64,000,000.0  
Payments of commissions                     $ 10,000 $ 10,000  
Gross proceeds from issuance of common stock                     498,100 498,100  
Net proceeds from issuance of common stock                     $ 488,100 $ 488,100  
Common Stock | 2021 Open Market Sale Agreement | Agents | Maximum                          
Nature Of Business And Basis Of Presentation [Line Items]                          
Aggregate offering price       $ 500,000