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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 103,031 $ 49,511
Marketable securities available-for-sale 117,666 73,141
Accounts receivable 1,163 727
Prepaid expenses and other current assets 2,489 4,058
Total current assets 224,349 127,437
Property and equipment, net 11,606 7,924
Goodwill 2,106 2,277
Restricted cash 615 632
Other assets 231 20
Total assets 238,907 138,290
Current liabilities:    
Accounts payable 2,359 1,159
Accrued research and development 7,861 6,938
Accrued liabilities 5,952 6,317
Deferred revenues 3,558 5,865
Total current liabilities 19,730 20,279
Deferred revenues, net of current portion 6,988 6,900
Long-term debt   9,559
Other long-term liabilities 1,001 1,070
Total liabilities $ 27,719 $ 37,808
Commitments and contingencies (Note 4)
Stockholders’ equity:    
Common stock: $0.001 par value; 69,500 shares authorized at September 30, 2015 and December 31, 2014; 38,425 and 26,307 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively $ 38 $ 26
Additional paid-in capital 886,575 695,058
Accumulated other comprehensive loss (2,560) (1,669)
Accumulated deficit (672,865) (592,933)
Total stockholders’ equity 211,188 100,482
Total liabilities and stockholders’ equity $ 238,907 $ 138,290
Series B Convertible Preferred Stock    
Stockholders’ equity:    
Preferred stock: $0.001 par value: Authorized: 5,000 shares; Issued and outstanding Series B Convertible Preferred Stock — no shares and 43 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively