Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Total revenue	$ 99,951	$ 105,136	$ 94,864
Operating costs and expenses:
Cost, Product and Service [Extensible Enumeration]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]
Product costs	$ 20,342	$ 17,177	$ 15,317
Research and development	50,609	46,734	50,188
Selling, general and administrative	46,935	30,677	28,392
Acquired intangible asset amortization	4,150	2,793	2,218
Acquisition transaction, integration and other costs		1,049
Contingent consideration expense	12	3
Total operating costs and expenses	122,048	98,433	96,115
Operating (loss) income	(22,097)	6,703	(1,251)
Other expense:
Interest expense	(598)	(310)	(133)
Foreign exchange gain (loss)	103	(170)	(248)
Investment income, net	99	123	656
Loss on strategic investments and other			(478)
Other expense	(396)	(357)	(203)
(Loss) income before income taxes	(22,493)	6,346	(1,454)
Income tax (provision) benefit	(4,781)	(2,109)	2,577
Net (loss) income	$ (27,274)	$ 4,237	$ 1,123
Basic net (loss) income per share	$ (1.96)	$ 0.31	$ 0.08
Diluted net (loss) income per share	$ (1.96)	$ 0.30	$ 0.08
Weighted average number of shares outstanding:
Basic	13,916	13,765	13,552
Diluted	13,916	13,989	13,812
Product Sales [Member]
Revenue:
Total revenue	$ 54,621	$ 46,478	$ 44,317
Royalties and License Fees [Member]
Revenue:
Total revenue	36,248	47,056	40,634
Research, Development and Other [Member]
Revenue:
Total revenue	$ 9,082	$ 11,602	$ 9,913