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Stockholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Number of Shares      
Outstanding at September 30, 2020 (in shares) 1,162,505    
Granted (in shares) 0    
Exercised (in shares) (259,865)    
Canceled (in shares) 0    
Outstanding at March 31, 2021 (in shares) 902,640   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) 7.54    
Canceled (in dollars per share) 0    
Outstanding at March 31, 2021 (in dollars per share) $ 7.50   $ 7.51
Options, Additional Disclosures      
Outstanding at September 30, 2020, Weighted-Average Remaining Contractual Term (in Years) 6 years   6 years 1 month 6 days
Outstanding at March 31, 2021, Weighted-Average Remaining Contractual Term (in Years) 6 years   6 years 1 month 6 days
Outstanding at September 30, 2020, Aggregate Intrinsic Value (in thousands) $ 11,368   $ 6,081
Outstanding at March 31, 2021, Aggregate Intrinsic Value (in thousands) $ 11,368   $ 6,081
Options, Vested and Expected to Vest      
Vested and Expected to Vest at March 31, 2021 (in shares) 902,640    
Vested and Expected to Vest at March 31, 2021, Weighted Average Exercise Price (in dollars per share) $ 7.50    
Vested and Expected to Vest at March 31, 2021, Weighted Average Remaining Contractual Term (in Years) 6 years    
Vested and Expected to Vest at March 31, 2021, Aggregate Intrinsic Value (in thousands) $ 11,368    
Exercisable at March 31, 2021 (in shares) 625,015    
Exercisable at March 31, 2021, Weighted Average Exercise Price (in dollars per share) $ 6.61    
Exercisable at March 31, 2021, Weighted Average Remaining Contractual Term (in Years) 5 years 2 months 12 days    
Exercisable at March 31, 2021, Aggregate Intrinsic Value (in thousands) $ 4,979