Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 64,693	$ 46,115
Restricted cash	411	411
Receivables from related party	1,161	840
Other current assets	3,434	2,124
Total current assets	69,699	49,490
Intangible asset, net	8,992	9,843
Property and equipment, net	5,647	7,179
Restricted cash	750	750
Other assets	3,701	2,622
Total assets	88,789	69,884
Current liabilities:
Accounts payable	1,680	2,558
Accrued expenses	7,272	11,472
Deferred revenue	2,623	2,623
Deferred revenue, related party	3,040	3,036
Other current liabilities	481	305
Total current liabilities	15,096	19,994
Other long-term liabilities	11,286	12,058
Deferred revenue, net of current portion	38,373	40,340
Deferred revenue, related party, net of current portion	26,343	28,588
Total liabilities	91,098	100,980
Commitments and contingencies (Note 10)
Stockholders' deficit:
Common stock, $0.001 par value; 200,000,000 and 125,000,000 shares authorized at September 30, 2011 and December 31, 2010, respectively; 96,153,387 and 73,091,514 shares issued and outstanding at September 30, 2011 and December 31, 2010, respectively	96	73
Additional paid-in capital	654,495	591,884
Accumulated other comprehensive income	690	683
Accumulated deficit	(657,590)	(623,736)
Total stockholders' deficit	(2,309)	(31,096)
Total liabilities and stockholders' deficit	$ 88,789	$ 69,884