Condensed Statements Of Operations And Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues:
Product sales	$ 9,129	$ 2,109
Royalties	14,081	9,421
License and other revenue	2,964	5,305
Total revenues	26,174	16,835
Costs and expenses:
Cost of sales	1,484	518
Research and development expense	3,298	3,482
Selling, general and administrative expense:
Selling General And Administrative Expense	25,963	21,773
Amortization of intangible assets	962
Total costs and expenses	31,707	25,773
Income (loss) from operations	(5,533)	(8,938)
Other income (expense):
Interest and other income	70	143
Interest expense	(116)
Total other income (expense)	(46)	143
Net income (loss) before income taxes	(5,579)	(8,795)
Provision for income taxes	99	(9)
Net income (loss)	(5,480)	(8,804)
Change in unrealized gain (loss) on available-for-sale securities	(20)	93
Comprehensive income (loss)	$ (5,500)	$ (8,711)
Basic net income (loss) per common share	$ (0.10)	$ (0.16)
Diluted net income (loss) per common share	$ (0.10)	$ (0.16)
Shares used in computing basic net income (loss) per common share	56,460,829	55,554,579
Shares used in computing diluted net income (loss) per common share	56,460,829	55,554,579