CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 77,998	$ 47,918
Accounts receivable	2,512	2,283
Other current assets	815	1,801
Total current assets	81,325	52,002
Auction rate securities	3,424	3,608
Fixed assets, at cost, net of accumulated depreciation and amortization	4,439	5,878
Other assets	200	1,250
Total assets	89,388	62,738
Current liabilities:
Accounts payable and accrued expenses	6,881	9,683
Deferred revenue - current	204	0
Other current liabilities	115	112
Total current liabilities	7,200	9,795
Deferred revenue - long term	213	0
Other liabilities	1,595	1,635
Total liabilities	9,008	11,430
Commitments and contingencies (Note 8)
Stockholders' equity:
Common stock	44	43
Additional paid-in capital	461,281	453,353
Accumulated deficit	(377,928)	(399,055)
Accumulated other comprehensive loss	(276)	(292)
Treasury stock	(2,741)	(2,741)
Total stockholders' equity	80,380	51,308
Total liabilities and stockholders' equity	$ 89,388	$ 62,738