Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 92,649	$ 94,310
Marketable securities		2,079
Receivables		995
Prepaid expenses and other current assets	301	497
Total current assets	92,950	97,881
Property and equipment, net		84
Total assets	92,950	97,965
Current liabilities:
Accounts payable	75	146
Accrued expenses and other current liabilities	1,435	1,918
Deferred revenue	2,526	2,526
Liabilities of discontinued operations		1,662
Total current liabilities	4,036	6,252
Deferred revenue	31,579	32,842
Total liabilities	35,615	39,094
Stockholders' equity:
Convertible preferred stock
Common stock	6,357	6,359
Capital in excess of par value	374,792	373,157
Treasury stock	(92,567)	(92,567)
Accumulated deficit	(231,247)	(228,078)
Total stockholders' equity	57,335	58,871
Total liabilities and stockholders' equity	$ 92,950	$ 97,965