Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue:
Total revenue	$ 23,003	$ 22,297
Operating costs and expenses:
Type of Cost, Good or Service [Extensible List]	Product Sales [Member]	Product Sales [Member]
Product costs	$ 4,497	$ 3,743
Research and development	11,663	10,882
Selling, general and administrative	9,192	7,023
Acquired intangible asset amortization	1,089	556
Contingent consideration expense	3
Total operating costs and expenses	26,444	22,204
Operating (loss) income	(3,441)	93
Other expense:
Investment income, net	26	41
Interest expense	(136)	(60)
Foreign exchange gain (loss)	33	(180)
Other expense	(77)	(199)
Loss before income taxes	(3,518)	(106)
Income tax benefit (provision)	706	(168)
Net loss	$ (2,812)	$ (274)
Basic net loss per share	$ (0.20)	$ (0.02)
Diluted net loss per share	$ (0.20)	$ (0.02)
Weighted average number of shares outstanding:
Basic	13,878	13,668
Diluted	13,878	13,668
Product Sales [Member]
Revenue:
Total revenue	$ 12,344	$ 10,102
Royalties and License Fees [Member]
Revenue:
Total revenue	8,099	9,334
Research, Development and Other [Member]
Revenue:
Total revenue	$ 2,560	$ 2,861