CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 104,324	$ 397,530
Marketable securities	58,188	31,170
Other current assets	2,749	5,916
Total current assets	165,261	434,616
Property and equipment, net	16,802	21,574
Marketable securities	160,779	31,394
Other assets	367	1,273
Total assets	343,209	488,857
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	1,572	4,192
Accrued expenses and other	13,692	14,195
Total current liabilities	15,264	18,387
Notes payable	129,499	134,499
Other liabilities	1,265	4,114
Total liabilities	146,028	157,000
Commitments and contingencies
Stockholders’ equity:
Preferred stock - $.01 par value, authorized 3,000,000 shares; no shares issued and outstanding at December 31, 2011 and 2010	0	0
Common stock - $.01 par value, authorized 170,000,000 shares; issued and outstanding 48,292,702 shares and 58,817,561 shares at December 31, 2011 and 2010, respectively	483	588
Additional paid-in capital	341,760	454,657
Accumulated other comprehensive income	3	914
Accumulated deficit	(145,065)	(124,302)
Total stockholders’ equity	197,181	331,857
Total liabilities and stockholders’ equity	$ 343,209	$ 488,857