Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Consolidated Statements of Operations [Abstract]
Net revenues	$ 28,039	$ 28,465	$ 58,036	$ 64,871
Costs and expenses:
Cost of product sales (exclusive of amortization of product rights)	7,041	8,153	14,578	14,972
Selling, general and administrative	11,604	12,814	24,874	25,239
Royalties	2,148	2,648	4,645	7,246
Research and development	614	1,795	1,173	2,701
Amortization of product rights	6,092	3,595	9,686	7,190
Total costs and expenses	27,499	29,005	54,956	57,348
Income (loss) from operations	540	(540)	3,080	7,523
Other expenses:
Interest expense, net	(42)	(9)	(83)	(10)
Total other expenses	(42)	(9)	(83)	(10)
Income (loss) before income taxes	498	(549)	2,997	7,513
(Provision for) benefit from income taxes	(301)	149	(1,058)	(2,900)
Net income (loss)	$ 197	$ (400)	$ 1,939	$ 4,613
Net income (loss) per share, basic	$ 0.01	$ (0.02)	$ 0.08	$ 0.18
Net income (loss) per share, diluted	$ 0.01	$ (0.02)	$ 0.07	$ 0.18
Weighted-average common shares, basic	25,673,667	25,405,165	25,577,314	25,377,575
Weighted-average common shares, diluted	26,246,073	25,405,165	26,167,997	25,997,176