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Stockholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Number of Shares      
Outstanding at September 30, 2020 (in shares) 1,162,505    
Granted (in shares) 0    
Exercised (in shares) (286,848)    
Canceled (in shares) (15,910)    
Outstanding at June 30, 2021 (in shares) 859,747   1,162,505
Weighted-Average Exercise Price      
Outstanding at September 30, 2020 (in dollars per share) $ 7.51    
Granted (in dollars per share) 0 $ 4.32  
Exercised (in dollars per share) 7.67    
Canceled (in dollars per share) 9.41    
Outstanding at June 30, 2021 (in dollars per share) $ 7.42   $ 7.51
Options, Additional Disclosures      
Outstanding at September 30, 2020, Weighted-Average Remaining Contractual Term (in Years) 5 years 9 months 18 days   6 years 1 month 6 days
Outstanding at June 30, 2021, Weighted-Average Remaining Contractual Term (in Years) 5 years 9 months 18 days   6 years 1 month 6 days
Outstanding at September 30, 2020, Aggregate Intrinsic Value (in thousands) $ 10,178   $ 6,081
Outstanding at June 30, 2021, Aggregate Intrinsic Value (in thousands) $ 10,178   $ 6,081
Options, Vested and Expected to Vest      
Vested and Expected to Vest at June 30, 2021 (in shares) 859,747    
Vested and Expected to Vest at June 30, 2021, Weighted Average Exercise Price (in dollars per share) $ 7.42    
Vested and Expected to Vest at June 30, 2021, Weighted Average Remaining Contractual Term (in Years) 5 years 9 months 18 days    
Vested and Expected to Vest at June 30, 2021, Aggregate Intrinsic Value (in thousands) $ 10,178    
Exercisable at June 30, 2021 (in shares) 636,639    
Exercisable at June 30, 2021, Weighted Average Exercise Price (in dollars per share) $ 6.68    
Exercisable at June 30, 2021, Weighted Average Remaining Contractual Term (in Years) 5 years 1 month 6 days    
Exercisable at June 30, 2021, Aggregate Intrinsic Value (in thousands) $ 8,007