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Equity Transactions - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Stock Options      
Outstanding as of beginning of period (in shares) 3,075,914    
Granted (in shares) 1,108,273    
Exercised (in shares) (1,033,529)    
Forfeited (in shares) (272,720)    
Expired (in shares) (33,653)    
Outstanding as of end of period (in shares) 2,844,285 3,075,914  
Vested and expected to vest as of end of period (in shares) 2,810,202    
Exercisable as of end of period (in shares) 1,477,408    
Weighted- Average Exercise Price      
Outstanding as of beginning of period (in dollars per share) $ 8.54    
Granted (in dollars per share) 10.60    
Exercised (in dollars per share) 6.59    
Forfeited (in dollars per share) 7.82    
Expired (in dollars per share) 15.35    
Outstanding as of end of period (in dollars per share) 10.04 $ 8.54  
Vested and expected to vest as of end of period (in dollars per share) 9.94    
Exercisable as of end of period (in dollars per share) $ 10.37    
Weighted- Average Remaining Contractual Term (years)      
Outstanding, weighted-average remaining contractual term 6 years 1 month 20 days 6 years 1 month 28 days  
Vested and expected to vest, weighted average remaining contractual term 6 years 1 month 6 days    
Exercisable, weighted-average remaining contractual term 4 years 2 months 26 days    
Aggregate Intrinsic Value      
Outstanding as of beginning of period, aggregate intrinsic value $ 2,841    
Granted, aggregate intrinsic value 0    
Exercised, aggregate intrinsic value 15,036 $ 100 $ 300
Forfeited, aggregate intrinsic value 2,547    
Expired, aggregate intrinsic value 108    
Outstanding as of end of period, aggregate intrinsic value 34,877 $ 2,841  
Vested and expected to vest, aggregate intrinsic value 34,775    
Exercisable, aggregate intrinsic value $ 18,589