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Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense included in expenses | $ 9,637 | $ 8,950 | $ 5,478
Cost of revenue |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense included in expenses | 207 | 78 | 52
Selling and marketing |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense included in expenses | 2,967 | 2,656 | 1,577
Research and development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense included in expenses | 2,013 | 1,801 | 1,028
General and administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation expense included in expenses | $ 4,450 | $ 4,415 | $ 2,821

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