CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 70,105	$ 47,918
Accounts receivable	1,516	2,283
Other current assets	919	1,801
Total current assets	72,540	52,002
Auction rate securities	3,332	3,608
Fixed assets, at cost, net of accumulated depreciation and amortization	4,038	5,878
Other assets	200	1,250
Total assets	80,110	62,738
Current liabilities:
Accounts payable and accrued expenses	6,331	9,683
Deferred revenue - current	204	0
Other current liabilities	115	112
Total current liabilities	6,650	9,795
Deferred revenue - long term	162	0
Other liabilities	1,497	1,635
Total liabilities	8,309	11,430
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock	44	43
Additional paid-in capital	463,440	453,353
Accumulated deficit	(388,674)	(399,055)
Accumulated other comprehensive loss	(268)	(292)
Treasury Stock	(2,741)	(2,741)
Total stockholders' equity	71,801	51,308
Total liabilities and stockholders' equity	$ 80,110	$ 62,738