CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 41,096	$ 70,105
Accounts receivable	1,129	1,516
Other current assets	1,186	919
Total current assets	43,411	72,540
Auction rate securities	3,240	3,332
Fixed assets, at cost, net of accumulated depreciation and amortization	3,650	4,038
Other assets	200	200
Total assets	50,501	80,110
Current liabilities:
Accounts payable and accrued expenses	6,486	6,331
Deferred revenue - current	204	204
Other current liabilities	115	115
Total current liabilities	6,805	6,650
Deferred revenue - long term	9	162
Other liabilities	1,039	1,497
Total liabilities	7,853	8,309
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $.001 par value; 20,000,000 shares authorized; issued and outstanding - none
Common stock, $.0013 par value; 80,000,000 shares authorized; issued - 34,076,951 in 2012 and 34,046,409 in 2011	44	44
Additional paid-in capital	469,386	463,440
Accumulated deficit	(423,781)	(388,674)
Accumulated other comprehensive loss	(260)	(268)
Treasury stock, at cost (200,000 shares in 2012 and 2011)	(2,741)	(2,741)
Total stockholders' equity	42,648	71,801
Total liabilities and stockholders' equity	$ 50,501	$ 80,110