Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenue:
Total revenue	$ 132,584	$ 99,951	$ 105,136
Operating costs and expenses:
Cost, Product and Service [Extensible Enumeration]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]
Product costs	$ 24,965	$ 20,342	$ 17,177
Research and development	46,595	50,609	46,734
Selling, general and administrative	51,884	46,935	30,677
Acquired intangible asset amortization	3,537	4,150	2,793
Restructuring expense	1,282
Contingent consideration (gain) expense	(829)	12	3
Acquisition transaction, integration and other costs			1,049
Total operating costs and expenses	127,434	122,048	98,433
Operating income (loss)	5,150	(22,097)	6,703
Other expense:
Interest expense, net	(3,489)	(598)	(310)
Foreign exchange (loss) gain	(251)	103	(170)
Investment income, net	1,077	99	123
Other expense, net	(2,663)	(396)	(357)
Income (loss) before income taxes	2,487	(22,493)	6,346
Income tax expense	(4,023)	(4,781)	(2,109)
Net (loss) income	$ (1,536)	$ (27,274)	$ 4,237
Basic net (loss) income per share	$ (0.11)	$ (1.96)	$ 0.31
Diluted net (loss) income per share	$ (0.11)	$ (1.96)	$ 0.30
Weighted average number of shares outstanding:
Basic	14,031	13,916	13,765
Diluted	14,031	13,916	13,989
Product Sales [Member]
Revenue:
Total revenue	$ 60,614	$ 54,621	$ 46,478
Royalties and License Fees [Member]
Revenue:
Total revenue	62,398	36,248	47,056
Research, Development and Other [Member]
Revenue:
Total revenue	$ 9,572	$ 9,082	$ 11,602