Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements of Income [Abstract]
Net revenues	$ 25,180	$ 27,932	$ 83,216	$ 92,803
Costs and expenses:
Cost of product sales (exclusive of amortization of product rights)	8,355	7,742	22,933	22,714
Selling, general and administrative	11,239	12,850	36,113	38,089
Royalties	1,605	2,600	6,250	9,846
Research and development	199	1,047	1,372	3,748
Amortization of product rights	3,591	3,595	13,277	10,785
Total costs and expenses	24,989	27,834	79,945	85,182
Income from operations	191	98	3,271	7,621
Other expenses:
Interest expense, net	(38)	(37)	(121)	(47)
Other expense, net		(25)		(25)
Total other expenses	(38)	(62)	(121)	(72)
Income before income taxes	153	36	3,150	7,549
(Provision for) benefit from income taxes	(36)	728	(1,094)	(2,172)
Net income	$ 117	$ 764	$ 2,056	$ 5,377
Net income per share, basic	$ 0	$ 0.03	$ 0.08	$ 0.21
Net income per share, diluted	$ 0	$ 0.03	$ 0.08	$ 0.21
Weighted-average common shares, basic	25,782,481	25,430,785	25,646,455	25,395,506
Weighted-average common shares, diluted	26,331,700	26,056,928	26,223,317	26,017,288