Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenue:
Total revenue	$ 27,198	$ 26,106	$ 52,131	$ 49,109
Operating costs and expenses:
Cost, Product and Service [Extensible Enumeration]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]	Product Sales [Member]
Product costs	$ 5,738	$ 5,107	$ 11,005	$ 9,604
Research and development	12,924	13,712	25,667	25,375
Selling, general and administrative	12,967	11,113	26,203	20,305
Acquired intangible asset amortization	867	1,071	1,780	2,160
Restructuring expense	1,282		1,282
Contingent consideration expense	3	3	6	6
Total operating costs and expenses	33,781	31,006	65,943	57,450
Operating loss	(6,583)	(4,900)	(13,812)	(8,341)
Other expense:
Interest expense, net	(884)	(129)	(1,710)	(265)
Foreign exchange (loss) gain	(75)	2	(200)	35
Investment income, net	177	25	349	51
Other expense	(782)	(102)	(1,561)	(179)
Loss before income taxes	(7,365)	(5,002)	(15,373)	(8,520)
Income tax (expense) benefit	(368)	919	(203)	1,625
Net loss	$ (7,733)	$ (4,083)	$ (15,576)	$ (6,895)
Basic net loss per share	$ (0.55)	$ (0.29)	$ (1.11)	$ (0.50)
Diluted net loss per share	$ (0.55)	$ (0.29)	$ (1.11)	$ (0.50)
Weighted average number of shares outstanding:
Basic	14,030	13,917	14,010	13,896
Diluted	14,030	13,917	14,010	13,896
Product Sales [Member]
Revenue:
Total revenue	$ 15,350	$ 13,964	$ 29,584	$ 26,308
Royalties and License Fees [Member]
Revenue:
Total revenue	9,429	9,844	18,194	17,943
Research, Development and Other [Member]
Revenue:
Total revenue	$ 2,419	$ 2,298	$ 4,353	$ 4,858