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Equity Transactions - Stock Appreciation Rights Activity (Details) - Stock appreciation rights - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
SARs    
Outstanding as of beginning of period (in shares) 160,810  
Exercised (in shares) (45,084)  
Forfeited (in shares) (73,681)  
Outstanding as of end of period (in shares) 42,045 160,810
Vested and expected to vest as of September 30, 2019 (in shares) 42,045  
Exercisable as of September 30, 2019 (in shares) 12,045  
Weighted- Average Exercise Price    
Outstanding as of beginning of period (in dollars per share) $ 8.45  
Exercised (in dollars per share) 8.45  
Forfeited (in dollars per share) 9.80  
Outstanding as of end of period (in dollars per share) 6.11 $ 8.45
Vested and expected to vest as of end of period (in dollars per share) 6.11  
Exercisable as of end of period (in dollars per share) $ 6.11  
Weighted- Average Remaining Contractual Term (years)    
Outstanding, weighted-average remaining contractual term 1 year 3 months 3 days 1 year
Vested and expected to vest as of end of period, weighted-average remaining contractual term 1 year 3 months 3 days  
Exercisable as of end of period, weighted average remaining contractual term 1 year 3 months 3 days  
Aggregate Intrinsic Value    
Outstanding as of beginning of period, aggregate intrinsic value $ 96  
Exercised, aggregate intrinsic value 443  
Forfeited, aggregate intrinsic value 213  
Outstanding as of end of period, aggregate intrinsic value 652 $ 96
Vested and expected to vest as of end of period, aggregate intrinsic value 652  
Exercisable as of end of period, aggregate intrinsic value $ 187