Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue:
Total revenue	$ 29,567	$ 30,341	$ 87,574	$ 92,851
Operating costs and expenses:
Cost, Product and Service [Extensible Enumeration]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]
Product costs	$ 8,576	$ 8,448	$ 23,831	$ 24,352
Research and development	7,573	9,765	24,881	28,658
Selling, general and administrative	17,750	16,627	47,969	42,257
Acquired intangible asset amortization	910	870	2,626	2,616
Total operating costs and expenses	34,809	35,710	99,307	97,883
Operating (loss) income	(5,242)	(5,369)	(11,733)	(5,032)
Other expense, net:
Interest expense, net	(864)	(879)	(2,601)	(2,656)
Foreign exchange loss	(88)	(51)	(126)	(168)
Investment income, net	265	488	905	1,487
Other expense, net	(687)	(442)	(1,822)	(1,337)
(Loss) income before income taxes	(5,929)	(5,811)	(13,555)	(6,369)
Income tax benefit (expense)	611	(1,743)	(623)	(1,724)
Net (loss) income	$ (5,318)	$ (7,554)	$ (14,178)	$ (8,093)
Basic net (loss) income per share	$ (0.37)	$ (0.53)	$ (0.99)	$ (0.57)
Diluted net (loss) income per share	$ (0.37)	$ (0.53)	$ (0.99)	$ (0.57)
Weighted average number of shares outstanding:
Basic	14,281	14,170	14,263	14,141
Diluted	14,281	14,170	14,263	14,141
Product Sales [Member]
Revenue:
Total revenue	$ 16,761	$ 17,562	$ 48,302	$ 54,488
Royalties and License Fees [Member]
Revenue:
Total revenue	9,657	10,458	30,198	31,048
Research, Development and Other [Member]
Revenue:
Total revenue	$ 3,149	$ 2,321	$ 9,074	$ 7,315