Statements Of Operations and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues:
Product sales	$ 27,483	$ 41,178	$ 45,637
Royalties	44,535	9,997	306
License and other revenue	18,798	81,798	34,821
Total revenues	90,816	132,973	80,764
Costs and expenses:
Cost of sales	6,039	5,544	8,097
Research and development expense	15,462	15,187	20,111
Selling, general and administrative expense:
Promotion fee expense		27,339	31,419
Other selling, general and administrative expense	97,646	54,205	17,512
Total selling, general and administrative expense	97,646	81,544	48,931
Amortization of intangible assets	2,022
Gain on settlement agreement		(40,000)
Total costs and expenses	121,169	62,275	77,139
Income (loss) from operations	(30,353)	70,698	3,625
Other income (expense):
Interest and other income	520	557	839
Interest expense	(39)	(133)	(572)
Total other income (expense)	481	424	267
Net income (loss) before income taxes	(29,872)	71,122	3,892
Benefit from (provision for) income taxes	91	(396)	4
Net income (loss)	(29,781)	70,726	3,896
Unrealized gains (losses) on available-for-sale securities	44	(82)	36
Comprehensive income (loss)	$ (29,737)	$ 70,644	$ 3,932
Basic net income (loss) per common share	$ (0.53)	$ 1.30	$ 0.07
Diluted net income (loss) per common share	$ (0.53)	$ 1.26	$ 0.07
Shares used in computing basic net income (loss) per common share	55,892,563	54,562,820	52,533,256
Shares used in computing diluted net income (loss) per common share	55,892,563	56,089,796	53,463,749