Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 13,724	$ 16,766
Marketable securities	44,178	67,366
Interest receivable	311	331
Accounts receivable	3,504	919
Prepaid expenses	674	310
Total current assets	62,391	85,692
Marketable securities, non-current	17,914	0
Property and equipment, net	1,467	1,603
Other assets	41	41
Total assets	81,813	87,336
Current liabilities:
Accounts payable and accrued liabilities	1,745	5,515
Accrued compensation and employee benefits	1,831	1,672
Deferred revenues	2,446	17
Total current liabilities	6,022	7,204
Deferred revenues, non-current portion	9,389	0
Total liabilities	15,411	7,204
Commitments and contingencies
Stockholders' equity:
Common stock, $0.01 par value; 80,000,000 shares authorized, 52,863,671 and 52,554,795 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively	529	526
Additional paid-in capital	337,889	332,839
Accumulated deficit	(272,031)	(253,245)
Accumulated other comprehensive income	15	12
Total stockholders' equity	66,402	80,132
Total liabilities and stockholders' equity	$ 81,813	$ 87,336