Quarterly Information (Unaudited) (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
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 38,765	$ 39,195	$ 33,510	$ 32,473	$ 33,270	$ 31,778	$ 28,773	$ 25,976	$ 65,982	$ 105,178	$ 143,943	$ 119,797	$ 101,310
Cost of revenue	5,217	5,784	4,451	4,556	3,200	3,410	3,792	4,138
Operating expenses	30,610	32,518	26,379	23,089	26,145	22,936	22,598	20,301
Operating income	2,938	893	2,680	4,828	3,925	5,432	2,383	1,537	7,509	8,403	11,339	13,277	8,868
Interest expense	2,107	2,077	2,040	2,008	1,587	2,223	1,319	0	4,048	6,125	8,232	5,129	0
Other income (expense), net	(369)	89	(225)	135	106	80	372	96	(90)	(2)	(370)	654	541
Income tax benefit (provision)	(773)	880	20	168	(637)	(304)	(417)	534	188	1,068	295	(824)	(1,595)
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
Net income (loss) per share:
Basic income (loss) per share (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
Shares used in calculating net income (loss) per share—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
Diluted income (loss) per share (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
Shares used in calculating net income (loss) 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