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Segment Information - Reconciliation from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Gross profit	$ 40,061	$ 41,213	$ 35,401	$ 33,178	$ 33,163	$ 25,228	$ 26,205	$ 25,328	$ 149,853	$ 109,924	$ 113,280
Operating expenses									122,679	113,248	127,739
Other operating expenses									6	573	5,049
Interest and other income, net									(411)	(924)	(1,448)
Income (loss) before income taxes	$ 8,253	$ 8,848	$ 5,667	$ 4,811	$ 5,538	$ 422	$ (4,195)	$ (4,738)	$ 27,579	$ (2,973)	$ (18,060)

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