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Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 13,346 | $ 11,532 | $ 9,551
Cost of revenue |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 289 | 339 | 267
Selling and marketing |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 4,383 | 3,399 | 2,528
Research and development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | 3,701 | 3,218 | 2,802
General and administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total stock-based compensation expense | $ 4,973 | $ 4,576 | $ 3,954

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