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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 26,750 $ 23,122
Marketable securities available-for-sale 150,929 166,254
Accounts receivable 1,730 1,627
Prepaid expenses and other current assets 2,323 1,375
Total current assets 181,732 192,378
Property and equipment, net 8,584 8,706
Goodwill 2,576 2,579
Restricted cash 662 662
Other assets 31 297
Total assets 193,585 204,622
Current liabilities:    
Accounts payable 1,863 1,901
Accrued liabilities 6,608 8,166
Deferred revenues 7,511 6,125
Total current liabilities 15,982 16,192
Deferred revenues, net of current portion 2,823 1,173
Other long-term liabilities 927 963
Total liabilities 19,732 18,328
Commitments and contingencies (Note 4)      
Stockholders’ equity:    
Preferred stock      
Common stock: $0.001 par value Authorized: 350,000 shares Issued and outstanding: 262,856 shares at March 31, 2014 and 262,796 shares at December 31, 2013 263 263
Additional paid-in capital 689,729 688,390
Total accumulated other comprehensive loss (88) (148)
Accumulated deficit (516,051) (502,211)
Total stockholders’ equity 173,853 186,294
Total liabilities and stockholders’ equity 193,585 204,622
Series B Convertible Preferred Stock
    
Stockholders’ equity:    
Preferred stock