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Equity Transactions - Restricted Stock Units and Restricted Stock Awards (Details) - RSUs & RSAs - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
RSU & RSA    
Outstanding as of beginning of period (in shares) 1,545,285  
Granted (in shares) 330,545  
Exercised (in shares) (811,773)  
Forfeited (in shares) (146,676)  
Outstanding as of end of period (in shares) 917,381 1,545,285
Expected to vest as of end of period (in shares) 666,092  
Weighted- Average Grant Date Fair Value    
Outstanding as of beginning of period (in dollars per share) $ 6.84  
Granted (in dollars per share) 14.08  
Exercised (in dollars per share) 6.78  
Forfeited (in dollars per share) 8.98  
Outstanding as of end of period (in dollars per share) 9.15 $ 6.84
Expected to vest as of end of period (in dollars per share) $ 10.17  
Additional Disclosures    
Outstanding, weighted-average remaining contractual term 1 year 11 months 23 days 1 year 10 months 6 days
Expected to vest as of end of period, weighted-average remaining contractual term 2 years 4 months 6 days  
Aggregate Fair Value    
Outstanding as of beginning of period, aggregate fair value $ 11,528  
Granted, aggregate fair value 4,653  
Exercised, aggregate fair value 13,780  
Forfeited, aggregate fair value 2,688  
Outstanding as of end of period, aggregate fair value 19,825 $ 11,528
Expected to vest as of end of period, aggregate fair value $ 14,394