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, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Accounting Policies [Abstract]
Net income	$ 1,911	$ 1,019	$ 5,035	$ 3,186
Weighted-average shares outstanding - basic (in shares)	44,775	43,138	44,795	42,835
Common stock equivalents (in shares)	1,322	1,416	1,411	1,532
Weighted-average shares outstanding - diluted (in shares)	46,097	44,554	46,206	44,367
Net income per share:
Basic (in dollars per share)	$ 0.04	$ 0.02	$ 0.11	$ 0.07
Diluted (in dollars per share)	$ 0.04	$ 0.02	$ 0.11	$ 0.07