Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenue:
Total revenue	$ 31,958	$ 27,198	$ 62,510	$ 52,131
Operating costs and expenses:
Cost, Product and Service [Extensible Enumeration]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]
Product costs	$ 7,101	$ 5,738	$ 15,904	$ 11,005
Research and development	10,229	12,924	18,893	25,667
Selling, general and administrative	13,093	12,967	25,630	26,203
Acquired intangible asset amortization	876	867	1,746	1,780
Restructuring expense		1,282		1,282
Contingent consideration expense		3		6
Total operating costs and expenses	31,299	33,781	62,173	65,943
Operating income (loss)	659	(6,583)	337	(13,812)
Other expense, net:
Interest expense, net	(881)	(884)	(1,777)	(1,710)
Foreign exchange loss	(72)	(75)	(117)	(200)
Investment income, net	460	177	999	349
Other expense, net	(493)	(782)	(895)	(1,561)
Income (loss) before income taxes	166	(7,365)	(558)	(15,373)
Income tax benefit (expense)	81	(368)	19	(203)
Net income (loss)	$ 247	$ (7,733)	$ (539)	$ (15,576)
Basic net income (loss) per share	$ 0.02	$ (0.55)	$ (0.04)	$ (1.11)
Diluted net income (loss) per share	$ 0.02	$ (0.55)	$ (0.04)	$ (1.11)
Weighted average number of shares outstanding:
Basic	14,152	14,030	14,127	14,010
Diluted	14,182	14,030	14,127	14,010
Product Sales [Member]
Revenue:
Total revenue	$ 18,099	$ 15,350	$ 36,926	$ 29,584
Royalties and License Fees [Member]
Revenue:
Total revenue	11,411	9,429	20,590	18,194
Research, Development and Other [Member]
Revenue:
Total revenue	$ 2,448	$ 2,419	$ 4,994	$ 4,353