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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents $ 24,490 $ 16,766
Marketable securities 55,206 67,366
Interest receivable 370 331
Accounts receivable 1,508 919
Prepaid expenses 250 310
Total current assets 81,824 85,692
Marketable securities, non-current 6,906  
Property and equipment, net 1,653 1,603
Other assets 41 41
Total assets 90,424 87,336
Liabilities and stockholders' equity    
Accounts payable and accrued liabilities 2,445 5,515
Accrued compensation and employee benefits 996 1,672
Deferred revenues 2,171 17
Total current liabilities 5,612 7,204
Deferred revenues, non-current portion 10,472  
Total liabilities 16,084 7,204
Commitments and contingencies      
Stockholders' equity:    
Common stock, $0.01 par value; 80,000,000 shares authorized, 52,586,590 and 52,554,795 shares issued and outstanding at March 31, 2012 and December 31, 2011, respectively 526 526
Additional paid-in capital 334,330 332,839
Accumulated deficit (260,513) (253,245)
Accumulated other comprehensive income (loss) (3) 12
Total stockholders' equity 74,340 80,132
Total liabilities and stockholders' equity $ 90,424 $ 87,336