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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Series A Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series A Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Series C Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series C Convertible Preferred Stock [Member]
Series D Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series D Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Income [Member]
Accumulated deficit [Member]
Total
Beginning Balance at Sep. 30, 2018 $ 9,141   $ 25,900   $ 36,726   $ 218,716     $ 9,346 $ 87 $ (210,855) $ (201,422)
Beginning Balance, shares at Sep. 30, 2018   2,818   3,316   2,491   10,326 3,206        
Issuance of common stock in public offerings, net of underwriting discounts, commissions and offering expenses                   153,852     153,852
Issuance of common stock in public offering, net of underwriting discounts and commissions and offering expenses, shares                 10,063        
Vesting of restricted stock units                 8        
Issuance of shares under the employee stock purchase plan                   2,700     2,700
Issuance of shares under the employee stock purchase plan, shares                 219        
Exercise of stock options                   2,264     2,264
Exercise of stock options, shares                 331        
Conversion of redeemable convertible preferred stock warrant liability to equity                   631     631
Conversion of redeemable convertible preferred stock to common stock $ (9,141)   $ (25,900)   $ (36,726)   $ (218,716)     290,462     290,462
Conversion of redeemable convertible preferred stock to common stock, shares   (2,818)   (3,316)   (2,491)   (10,326) 18,951        
Stock-based compensation                   11,170     11,170
Net exercise of stock warrants   95                      
Other comprehensive income                     94   94
Net loss                       (107,669) (107,669)
Ending Balance at Sep. 30, 2019                   470,425 181 (318,524) 152,082
Ending Balance, shares at Sep. 30, 2019                 32,873        
Issuance of common stock in public offerings, net of underwriting discounts, commissions and offering expenses                   295,563     295,563
Issuance of common stock in public offering, net of underwriting discounts and commissions and offering expenses, shares                 11,064        
Vesting of restricted stock units                 178        
Issuance of shares under the employee stock purchase plan                   3,428     3,428
Issuance of shares under the employee stock purchase plan, shares                 126        
Exercise of stock options                   10,539     10,539
Exercise of stock options, shares                 915        
Repurchases of early exercised stock options, shares                 (2)        
Stock-based compensation                   17,096     17,096
Other comprehensive income                     (94)   (94)
Repurchases of common stock for income tax withholding                   (2,421)     (2,421)
Repurchases of common stock for income tax withholding, shares                 (71)        
Net loss                       (139,931) (139,931)
Ending Balance at Sep. 30, 2020                   794,630 87 (458,455) 336,262
Ending Balance, shares at Sep. 30, 2020                 45,083        
Issuance of common stock in public offerings, net of underwriting discounts, commissions and offering expenses                   323,861     323,861
Issuance of common stock in public offering, net of underwriting discounts and commissions and offering expenses, shares                 3,136        
Vesting of restricted stock units                 237        
Issuance of shares under the employee stock purchase plan                   4,944     4,944
Issuance of shares under the employee stock purchase plan, shares                 74        
Exercise of stock options                   14,471     14,471
Exercise of stock options, shares                 804        
Repurchases of early exercised stock options, shares                 (2)        
Stock-based compensation                   36,998     36,998
Business acquisition                   26,773     26,773
Business acquisition, shares                 237        
Net exercise of stock warrants                 22        
Other comprehensive income                     459   459
Repurchases of common stock for income tax withholding                   (10,849)     (10,849)
Repurchases of common stock for income tax withholding, shares                 (92)        
Net loss                       (152,098) (152,098)
Ending Balance at Sep. 30, 2021                   $ 1,190,828 $ 546 $ (610,553) $ 580,821
Ending Balance, shares at Sep. 30, 2021                 49,499