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Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 17,032 $ 23,122
Marketable securities available-for-sale 137,281 166,254
Accounts receivable 1,292 1,627
Prepaid expenses and other current assets 4,978 1,375
Total current assets 160,583 192,378
Property and equipment, net 8,789 8,706
Goodwill 2,557 2,579
Restricted cash 660 662
Other assets 876 297
Total assets 173,465 204,622
Current liabilities:    
Accounts payable 1,900 1,901
Accrued research and development 6,720 2,402
Other accrued liabilities 4,979 5,764
Deferred revenues 6,584 6,125
Total current liabilities 20,183 16,192
Deferred revenues, net of current portion 1,710 1,173
Other long-term liabilities 902 963
Total liabilities 22,795 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 691,419 688,390
Accumulated other comprehensive loss (184) (148)
Accumulated deficit (540,828) (502,211)
Total stockholders’ equity 150,670 186,294
Total liabilities and stockholders’ equity 173,465 204,622
Series B Convertible Preferred Stock
    
Stockholders’ equity:    
Preferred stock