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Stock-based Compensation and Equity Grants - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Number of Shares    
Outstanding at September 30, 2020 (in shares) 2,374  
Granted (in shares) 275  
Exercised (in shares) (257)  
Outstanding at September 30, 2021 (in shares) 2,392 2,374
Weighted Average Exercise Price    
Outstanding at September 30, 2020 (in dollars per share) $ 5.60  
Granted (in dollars per share) 16.17  
Exercised (in dollars per share) 3.47  
Outstanding at September 30, 2021 (in dollars per share) $ 7.05 $ 5.60
Weighted Average Remaining Contractual Term (in years)    
Outstanding at September 30, 2020 5 years 4 months 24 days 5 years 7 months 6 days
Outstanding at September 30, 2021 5 years 4 months 24 days 5 years 7 months 6 days
Aggregate Intrinsic Value    
Outstanding at the September 30, 2020 $ 15,899  
Options outstanding at September 30, 2021 $ 13,566 $ 15,899
Stock Options    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Volatility rate 50.00%  
Term 10 years  
Stock price threshold term 10 days