Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Royalties and license fees	$ 6,283	$ 7,643	$ 12,893	$ 15,160
Product sales	5,067	5,128	9,701	9,577
Research and development	860	563	1,532	1,119
Total revenue	12,210	13,334	24,126	25,856
Operating costs and expenses:
Product costs	1,615	1,849	3,205	3,412
Research and development	3,512	3,800	7,150	6,305
Selling, general and administrative	3,394	3,473	6,860	7,197
Restructuring charges				609
Total operating costs and expenses	8,521	9,122	17,215	17,523
Operating income from continuing operations	3,689	4,212	6,911	8,333
Other (loss) income:
Investment income, net	143	167	281	351
Impairment loss on investment	(804)		(804)
Other income (loss), net	162	208	170	208
Other (loss) income	(499)	375	(353)	559
Income from continuing operations before income taxes	3,190	4,587	6,558	8,892
Income tax provision	(1,244)	(1,763)	(2,457)	(3,208)
Income from continuing operations	1,946	2,824	4,101	5,684
Discontinued operations:
(Loss) income from discontinued operations, net of income taxes	(344)	(336)	1,261	(9,367)
Income (loss) on sale of discontinued operations, net of income taxes	121		(933)
(Loss) income from discontinued operations	(223)	(336)	328	(9,367)
Net income (loss)	$ 1,723	$ 2,488	$ 4,429	$ (3,683)
Basic income (loss) per share:
Continuing operations	$ 0.11	$ 0.16	$ 0.23	$ 0.33
Discontinued operations	$ (0.01)	$ (0.02)	$ 0.02	$ (0.54)
Net income (loss)	$ 0.10	$ 0.14	$ 0.25	$ (0.21)
Diluted income (loss) per share:
Continuing operations	$ 0.11	$ 0.16	$ 0.23	$ 0.33
Discontinued operations	$ (0.01)	$ (0.02)	$ 0.02	$ (0.54)
Net income (loss)	$ 0.10	$ 0.14	$ 0.25	$ (0.21)
Weighted average number of shares outstanding:
Basic	17,519	17,407	17,498	17,395
Diluted	17,632	17,471	17,575	17,428