CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Product sales	$ 16,278	$ 9,684	$ 39,513	$ 14,994
Royalties	15,422	12,201	44,599	31,199
License and other revenue	5,760	11,397	9,484	18,033
Total revenues	37,460	33,282	93,596	64,226
Costs and expenses:
Cost of sales	1,751	1,763	4,923	3,723
Research and development expense	1,339	5,270	6,049	12,277
Selling, general and administrative expense	26,374	26,832	77,705	73,625
Amortization of intangible assets	1,158	958	3,082	1,063
Total costs and expenses	30,622	34,823	91,759	90,688
Income (loss) from operations	6,838	(1,541)	1,837	(26,462)
Other income (expense):
Interest and other income	27	96	142	444
Interest and other expense	(285)	(39)	(440)	(39)
Total other income (expense)	(258)	57	(298)	405
Net income (loss) before income taxes	6,580	(1,484)	1,539	(26,057)
Provision for income taxes	(66)	(11)	(27)	(20)
Net income (loss)	6,514	(1,495)	1,512	(26,077)
Unrealized losses on available-for-sale securities	15	17	(39)	101
Comprehensive income (loss)	$ 6,529	$ (1,478)	$ 1,473	$ (25,976)
Basic net income (loss) per common share (in dollars per share)	$ 0.11	$ (0.03)	$ 0.03	$ (0.47)
Diluted net income (loss) per common share (in dollars per share)	$ 0.11	$ (0.03)	$ 0.03	$ (0.47)
Shares used in computing basic net income (loss) per common share (in shares)	56,818,883	56,039,186	56,615,359	55,794,357
Shares used in computing diluted net income (loss) per common share (in shares)	57,661,212	56,039,186	57,316,830	55,794,357