Condensed Consolidated Balance Sheets (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 22,646	$ 15,926
Short-term investments, available-for-sale	118,675	64,686
Receivables	1,714	16,959
Prepaids and other current assets	1,993	518
Total current assets	145,028	98,089
Property and equipment, net	2,214	2,007
Other assets	337	358
Total assets	147,579	100,454
Current liabilities:
Accounts payable	3,182	3,073
Accrued clinical liabilities	4,646	5,681
Accrued payroll and employee liabilities	2,173	2,802
Other accrued liabilities	2,246	1,550
Current portion of deferred revenue	4,306	4,306
Current portion of long-term debt	1,725	3,310
Total current liabilities	18,278	20,722
Deferred rent	213	205
Non-current portion of deferred revenue	0	2,153
Non-current portion of long-term debt	221	251
Commitments and contingencies (see Note 5)
Stockholders' equity:
Common stock	27	23
Additional paid-in capital	551,290	466,110
Accumulated other comprehensive income	0	31
Accumulated deficit	(422,450)	(389,041)
Total stockholders' equity	128,867	77,123
Total liabilities and stockholders' equity	$ 147,579	$ 100,454