CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 19,031	$ 16,105
Restricted cash	793	793
Current portion of marketable securities	100,394	105,208
Interest and other receivables	866	1,398
Current portion of prepaid assets	1,438	2,121
Total current assets	122,522	125,625
Noncurrent portion of marketable securities	16,712	32,133
Property and equipment, net	1,074	1,241
Deposits and other assets	879	1,048
Assets	141,187	160,047
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	2,666	2,980
Accrued compensation and benefits	1,774	3,029
Accrued restructuring charges	1,417	3,730
Accrued liabilities	4,379	3,641
Fair value of derivatives	38	64
Total current liabilities	10,274	13,444
Commitments and contingencies
Stockholders' equity:
Common stock	132	131
Additional paid-in capital	935,069	932,066
Accumulated deficit	(804,242)	(785,503)
Accumulated other comprehensive loss	(46)	(91)
Total stockholders' equity	130,913	146,603
Liabilities and Stockholders' Equity	$ 141,187	$ 160,047