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Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounting Policies [Abstract]        
Net income $ 811 $ 2,985 $ 4,948 $ 6,171
Weighted-average shares outstanding - basic (in shares) 44,669 43,773 44,721 43,145
Common stock equivalents (in shares) 555 1,421 1,072 1,501
Weighted-average shares outstanding - diluted (in shares) 45,224 45,194 45,793 44,646
Net income per share:        
Basic (in dollars per share) $ 0.02 $ 0.07 $ 0.11 $ 0.14
Diluted (in dollars per share) $ 0.02 $ 0.07 $ 0.11 $ 0.14