CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 71,479	$ 37,216
Available-for-sale securities	83,776	101,970
Inventories	3,107	3,225
Prepaid expenses and other assets	1,045	1,648
Current assets of discontinued operations		6
Total current assets	159,407	144,065
Property and equipment, net	321	221
Total assets	159,728	144,286
Current liabilities:
Accounts payable	1,835	2,395
Accrued research and clinical expenses	1,090	2,625
Accrued employee compensation and benefits	3,225	2,820
Accrued and other liabilities	759	932
Current liabilities of discontinued operations	2,344	3,512
Total current liabilities	9,253	12,284
Commitments and contingencies
Stockholders' equity:
Preferred stock; $1.00 par value; 5,000 shares authorized; no shares issued and outstanding
Common stock; $.001 par value; 200,000 shares authorized; 88,882 and 81,568 shares issued and outstanding at September 30, 2011 and December 31, 2010, respectively	89	82
Additional paid-in capital	485,169	432,041
Accumulated other comprehensive income	19	4
Accumulated deficit	(334,802)	(300,125)
Total stockholders' equity	150,475	132,002
Total liabilities and stockholders' equity	$ 159,728	$ 144,286