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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
Jul. 30, 2021
Dec. 15, 2020
Sep. 30, 2021
Sep. 30, 2020
Number of Shares        
Outstanding at September 30, 2020 (in shares)     2,129  
Granted (in shares)     455  
Exercised (in shares)     (175)  
Cancelled (in shares)     (35)  
Outstanding at September 30, 2021 (in shares)     2,374 2,129
Weighted Average Exercise Price        
Outstanding at September 30, 2020 (in dollars per share)     $ 6.14  
Granted (in dollars per share)     10.47  
Exercised (in dollars per share)     2.48  
Cancelled (in dollars per share)     7.36  
Outstanding at September 30, 2021 (in dollars per share)     $ 7.77 $ 6.14
Weighted Average Remaining Contractual Term (in years)        
Outstanding at September 30, 2020     7 years 8 months 12 days 7 years 4 months 24 days
Outstanding at September 30, 2021     7 years 8 months 12 days 7 years 4 months 24 days
Aggregate Intrinsic Value        
Outstanding at the September 30, 2020     $ 6,583  
Options outstanding at September 30, 2021     $ 15,899 $ 6,583
Stock Options        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Volatility rate 50.00% 50.00% 50.00%  
Term 10 years 10 years 10 years  
Stock price threshold term     10 days