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Stockholders' Equity - Stock-Based Compensation Expense Related to Stock Options and RSUs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense included in expenses $ 3,688 $ 2,867 $ 10,117 $ 8,582
Unrecognized compensation expense related to outstanding stock options and RSUs 32,600   $ 32,600  
Weighted average period for unrecognized compensation expense expected to be recognized (in years)     2 years 6 months  
Cost of revenue        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense included in expenses 82 89 $ 249 258
Selling and marketing        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense included in expenses 1,273 857 3,351 2,537
Research and development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense included in expenses 1,071 797 2,875 2,313
General and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation expense included in expenses $ 1,262 $ 1,124 $ 3,642 $ 3,474