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Warrants - Summary of Issued Warrants for Its Redeemable Convertible Preferred Stock and Common Stock (Detail) - $ / shares
shares in Thousands
12 Months Ended
Sep. 30, 2020
Nov. 01, 2020
Oct. 01, 2020
Sep. 30, 2019
Jul. 31, 2019
Nov. 30, 2018
Class of Warrant or Right [Line Items]            
Number of shares underlying warrants 26,385 7,531 18,854 16,221 32,064 68,901
Exercise price per share       $ 7.84 $ 6.24  
Warrants One [Member]            
Class of Warrant or Right [Line Items]            
Number of shares underlying warrants           36,838
Exercise price per share           $ 3.26
Warrants Two [Member]            
Class of Warrant or Right [Line Items]            
Number of shares underlying warrants           32,063
Exercise price per share           $ 6.24
Common Stock [Member]            
Class of Warrant or Right [Line Items]            
Number of shares underlying warrants 26,385          
Common Stock [Member] | Warrants One [Member]            
Class of Warrant or Right [Line Items]            
Number of shares underlying warrants 18,854          
Issuance date Dec. 22, 2015          
Expiration date Dec. 22, 2025          
Exercise price per share $ 14.85          
Common Stock [Member] | Warrants Two [Member]            
Class of Warrant or Right [Line Items]            
Number of shares underlying warrants 7,531          
Issuance date Mar. 28, 2016          
Expiration date Mar. 28, 2026          
Exercise price per share $ 21.24