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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 02, 2019 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock reserved for issuance | 6,350,000 |  |  |  |  |
Common stock, par value | $ 0.01 | $ 0.01 |  | $ 0.01 |  | $ 0.01
Increase in shares available for issuance, description | The shares available for issuance will automatically increase on January 1st of each year, by the lesser of (A) three percent (3%) of the number of shares of Common Stock outstanding as of the close of business on the immediately preceding December 31st; and (B) the number of shares of Common Stock determined by the Board on or prior to such date for such year. |  |  |  |  |
Increase in shares available for issuance expressed as percentage of number of shares of common stock outstanding | 3.00% |  |  |  |  |
Stock-based compensation |  | $ 6,253 | $ 14,710 | $ 23,020 | $ 42,179 |
Due to the Resignation of Former CEO |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock-based compensation |  |  |  | 4,000 |  |
Due to the Resignation of Former CFO and General Counsel |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock-based compensation |  |  |  | 2,400 |  |
Net of Forfeitures, Due to the Resignation of Former CEO |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock-based compensation |  |  |  | 5,000 |  |
Net of Forfeitures, Due to the Resignation of Former CFO and General Counsel |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 200 |  |
2019 Equity Incentive Plan |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock reserved for issuance | 5,300,000 |  |  |  |  |
2019 Employee Stock Purchase Plan |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |
Common stock reserved for issuance | 1,050,000 |  |  |  |  |

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