CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
U.S. Feraheme product sales, net	$ 17,456	$ 14,094	$ 33,034	$ 27,720
License fee and other collaboration revenues	2,055	16,592	4,058	18,345
Other product sales and royalties	138	326	437	427
Total revenues	19,649	31,012	37,529	46,492
Costs and expenses:
Cost of product sales	3,145	3,224	6,087	5,870
Research and development expenses	4,049	7,671	9,453	20,133
Selling, general and administrative expenses	15,211	15,101	29,216	28,282
Restructuring expenses		1,058		1,058
Total costs and expenses	22,405	27,054	44,756	55,343
Other income (expense):
Interest and dividend income, net	256	338	527	731
Gains on sale of assets	566		865
Gains (losses) on investments, net	26	(1,471)	32	(1,471)
Total other income (expense)	848	(1,133)	1,424	(740)
Net (loss) income before income taxes	(1,908)	2,825	(5,803)	(9,591)
Income tax benefit		494		494
Net (loss) income	$ (1,908)	$ 3,319	$ (5,803)	$ (9,097)
Net (loss) income per share:
Basic (in dollars per share)	$ (0.09)	$ 0.16	$ (0.27)	$ (0.43)
Diluted (in dollars per share)	$ (0.09)	$ 0.15	$ (0.27)	$ (0.43)
Weighted average shares outstanding used to compute net (loss) income per share:
Basic (in shares)	21,603	21,370	21,574	21,359
Diluted (in shares)	21,603	21,649	21,574	21,359