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Equity Transactions - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Stock Options      
Outstanding as of September 30, 2018 (in shares) 2,018,323    
Granted (in shares) 1,134,316    
Exercised (in shares) (132,633)    
Forfeited (in shares) (347,728)    
Outstanding as of September 30, 2019 (in shares) 2,672,278 2,018,323  
Vested and expected to vest as of September 30, 2019 (in shares) 2,609,071    
Exercisable as of September 30, 2019 (in shares) 1,270,164    
Weighted- Average Exercise Price      
Outstanding as of September 30, 2018 (in dollars per share) $ 10.49    
Granted (in dollars per share) 6.32    
Exercised (in dollars per share) 4.44    
Forfeited (in dollars per share) 6.78    
Outstanding as of September 30, 2019 (in dollars per share) 9.50 $ 10.49  
Vested and expected to vest as of September 30, 2019 (in dollars per share) 9.58    
Exercisable as of September 30, 2019 (in dollars per share) $ 12.94    
Weighted- Average Remaining Contractual Term (years)      
Outstanding, weighted-average remaining contractual term 6 years 2 months 8 days 5 years 1 month 17 days  
Vested and expected to vest, weighted average remaining contractual term 6 years 1 month 24 days    
Exercisable, weighted-average remaining contractual term 4 years 4 months 13 days    
Aggregate Intrinsic Value      
Outstanding as of September 30, 2018, aggregate intrinsic value $ 1,143    
Granted, aggregate intrinsic value 0    
Exercised, aggregate intrinsic value 307 $ 30 $ 24
Forfeited, aggregate intrinsic value 279    
Outstanding as of September 30, 2019, aggregate intrinsic value 2,502 $ 1,143  
Vested and expected to vest, aggregate intrinsic value 2,409    
Exercisable, aggregate intrinsic value $ 876