Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 50,386	$ 42,559
Marketable securities	138,013	155,478
Accounts receivable	752	511
Prepaid expenses, deposits and other current assets	2,192	1,843
Deferred tax, current portion	182	182
Total current assets	191,525	200,573
Property and equipment, net	963	937
Intangible asset, net	8,781	9,522
Deferred tax, noncurrent portion	1,639	1,639
Restricted cash	530	430
Total assets	203,438	213,101
Current liabilities:
Accounts payable	1,337	648
Accrued liabilities	2,513	1,324
Accrued income taxes	2,221	2,266
Deferred revenues, current portion	26,789	26,789
Total current liabilities	32,860	31,027
Deferred rent	471	490
Deferred revenues, noncurrent portion	130,569	143,853
Total liabilities	163,900	175,370
Commitments
Stockholders' equity:
Preferred stock, $0.001 par value; 20,000,000 shares authorized and none issued and outstanding at June 30, 2011 and December 31, 2010	0	0
Common stock, $0.001 par value; 150,000,000 shares authorized as of June 30, 2011 and December 31, 2010; and 28,103,441 and 28,041,379 shares issued and outstanding as of June 30, 2011 and December 31, 2010, respectively	28	28
Additional paid-in capital	294,271	291,342
Accumulated other comprehensive income	85	2
Accumulated deficit	(254,846)	(253,641)
Total stockholders' equity	39,538	37,731
Total liabilities and stockholders' equity	$ 203,438	$ 213,101