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Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in expenses $ 11,532 $ 9,551 $ 9,637
Cost of revenue      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in expenses 339 267 207
Selling and marketing      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in expenses 3,399 2,528 2,554
Research and development      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in expenses 3,218 2,802 2,426
General and administrative      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense included in expenses $ 4,576 $ 3,954 $ 4,450