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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 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Accounting Policies [Abstract]        
Net income $ 1,019 $ 908 $ 3,186 $ 1,468
Weighted-average shares outstanding - basic (in shares) 43,138 41,022 42,835 40,817
Common stock equivalents (in shares) 1,416 1,006 1,532 1,213
Weighted-average shares outstanding - diluted (in shares) 44,554 42,028 44,367 42,030
Net income per share:        
Basic (in dollars per share) $ 0.02 $ 0.02 $ 0.07 $ 0.04
Diluted (in dollars per share) $ 0.02 $ 0.02 $ 0.07 $ 0.03