CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 317,867	$ 397,530	[1]
Short-term investments	41,083	31,170	[1]
Other current assets	4,189	5,916	[1]
Total current assets	363,139	434,616	[1]
Property and equipment, net of accumulated depreciation of $39,983 at June 30, 2011 and $38,286 at December 31, 2010	19,485	21,574	[1]
Marketable securities	3,316	31,394	[1]
Other assets	759	1,273	[1]
Total assets	386,699	488,857	[1]
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	1,430	4,192	[1]
Accrued expenses and other	11,050	14,195	[1]
Total current liabilities	12,480	18,387	[1]
Notes payable	134,499	134,499	[1]
Other liabilities	4,266	4,114	[1]
Total liabilities	151,245	157,000	[1]
Commitments and contingencies
Stockholders’ equity:
Preferred stock - $.01 par value, authorized 3,000,000 shares; no shares issued and outstanding at June 30, 2011 and December 31, 2010	0	0	[1]
Common stock - $.01 par value, authorized 170,000,000 shares; issued and outstanding 50,631,943 shares at June 30, 2011 and 58,817,561 shares at December 31, 2010	506	588	[1]
Additional paid-in capital	365,331	454,657	[1]
Accumulated other comprehensive income	556	914	[1]
Accumulated deficit	(130,939)	(124,302)	[1]
Total stockholders’ equity	235,454	331,857	[1]
Total liabilities and stockholders’ equity	$ 386,699	$ 488,857	[1]

[1] Condensed from audited financial statements.