Nature of Operations and Summary of Significant Accounting Policies - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income	$ (311)	$ (215)	$ 435	$ 3,123	$ 1,807	$ 2,985	$ 1,019	$ 2,167	$ 3,559	$ 3,344	$ 3,032	$ 7,978	$ 7,814
Weighted-average shares outstanding—basic (in shares)	44,661	44,669	44,775	44,788	44,616	43,773	43,138	42,476	44,795	44,721	44,595	43,509	41,410
Common stock equivalents (in shares)											1,185	1,574	1,123
Shares used in calculating net income per share—diluted (in shares)	45,311	45,224	46,097	46,155	46,236	45,194	44,554	43,897	46,206	45,793	45,780	45,083	42,533
Net income (loss) per share:
Net income per share—basic (in dollars per share)	$ (0.01)	$ (0.00)	$ 0.01	$ 0.07	$ 0.04	$ 0.07	$ 0.02	$ 0.05	$ 0.08	$ 0.07	$ 0.07	$ 0.18	$ 0.19
Net income per share—diluted (in dollars per share)	$ (0.01)	$ 0	$ 0.01	$ 0.07	$ 0.04	$ 0.07	$ 0.02	$ 0.05	$ 0.08	$ 0.07	$ 0.07	$ 0.18	$ 0.18