Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue:
Royalties and license fees	$ 7,827	$ 7,104	$ 22,294	$ 19,997
Product sales	5,577	5,748	16,688	15,449
Research and development	885	1,107	2,853	2,639
Total revenue	14,289	13,959	41,835	38,085
Operating costs and expenses:
Product costs	1,990	2,251	5,894	5,456
Research and development	4,009	3,503	11,145	10,653
Selling, general and administrative	4,052	3,412	11,552	10,272
Total operating costs and expenses	10,051	9,166	28,591	26,381
Operating income from continuing operations	4,238	4,793	13,244	11,704
Other income (loss):
Investment income, net	60	137	187	418
Impairment loss on strategic investments			(129)	(804)
Other income, net	2	2	1,460	172
Other income (loss)	62	139	1,518	(214)
Income from continuing operations before income taxes	4,300	4,932	14,762	11,490
Income tax provision	(1,122)	(1,758)	(3,916)	(4,215)
Income from continuing operations	3,178	3,174	10,846	7,275
Discontinued operations:
(Loss) Income from discontinued operations, net of income taxes	(47)	(30)	635	1,231
Loss on sale of discontinued operations, net of income taxes		(82)		(1,015)
(Loss) Income from discontinued operations	(47)	(112)	635	216
Net income	$ 3,131	$ 3,062	$ 11,481	$ 7,491
Basic income (loss) per share:
Continuing operations	$ 0.22	$ 0.18	$ 0.74	$ 0.42
Discontinued operations	$ 0.00	$ (0.01)	$ 0.04	$ 0.01
Net income	$ 0.22	$ 0.17	$ 0.79	$ 0.43
Diluted income (loss) per share:
Continuing operations	$ 0.22	$ 0.18	$ 0.73	$ 0.41
Discontinued operations	$ 0.00	$ (0.01)	$ 0.04	$ 0.01
Net income	$ 0.21	$ 0.17	$ 0.77	$ 0.43
Weighted average number of shares outstanding:
Basic	14,413	17,528	14,563	17,505
Diluted	14,739	17,647	14,823	17,593