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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 |  |  |  |

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