Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue:
Total revenue	$ 30,341	$ 52,483	$ 92,851	$ 104,614
Operating costs and expenses:
Cost, Product and Service [Extensible Enumeration]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]
Product costs	$ 8,448	$ 6,921	$ 24,352	$ 17,926
Research and development	9,765	11,232	28,658	36,899
Selling, general and administrative	16,627	12,874	42,257	39,077
Acquired intangible asset amortization	870	879	2,616	2,659
Restructuring expense				1,282
Contingent consideration gain		(835)		(829)
Total operating costs and expenses	35,710	31,071	97,883	97,014
Operating (loss) income	(5,369)	21,412	(5,032)	7,600
Other expense, net:
Interest expense, net	(879)	(884)	(2,656)	(2,594)
Foreign exchange loss	(51)	(61)	(168)	(261)
Investment income, net	488	182	1,487	531
Other expense, net	(442)	(763)	(1,337)	(2,324)
(Loss) income before income taxes	(5,811)	20,649	(6,369)	5,276
Income tax expense	(1,743)	(13,303)	(1,724)	(13,506)
Net (loss) income	$ (7,554)	$ 7,346	$ (8,093)	$ (8,230)
Basic net (loss) income per share	$ (0.53)	$ 0.52	$ (0.57)	$ (0.59)
Diluted net (loss) income per share	$ (0.53)	$ 0.52	$ (0.57)	$ (0.59)
Weighted average number of shares outstanding:
Basic	14,170	14,050	14,141	14,020
Diluted	14,170	14,072	14,141	14,020
Product Sales [Member]
Revenue:
Total revenue	$ 17,562	$ 15,667	$ 54,488	$ 45,251
Royalties and License Fees [Member]
Revenue:
Total revenue	10,458	34,153	31,048	52,347
Research, Development and Other [Member]
Revenue:
Total revenue	$ 2,321	$ 2,663	$ 7,315	$ 7,016