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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 36,486 $ 49,511
Marketable securities available-for-sale 56,895 73,141
Accounts receivable 657 727
Prepaid expenses and other current assets 3,858 4,058
Total current assets 97,896 127,437
Property and equipment, net 8,887 7,924
Goodwill 2,078 2,277
Restricted cash 613 632
Other assets 20 20
Total assets 109,494 138,290
Current liabilities:    
Accounts payable 2,345 1,159
Accrued research and development 5,927 6,938
Accrued liabilities 4,746 6,317
Deferred revenues 7,448 5,865
Long-term debt, current portion 1,498  
Total current liabilities 21,964 20,279
Deferred revenues, net of current portion 3,916 6,900
Long-term debt, net of current portion 7,961 9,559
Other long-term liabilities 1,125 1,070
Total liabilities $ 34,966 $ 37,808
Commitments and contingencies    
Stockholders’ equity:    
Common stock: $0.001 par value; 69,500 shares authorized at June 30, 2015 and December 31, 2014; 30,237 and 26,307 shares issued and outstanding at June 30, 2015 and December 31, 2014, respectively $ 30 $ 26
Additional paid-in capital 719,966 695,058
Accumulated other comprehensive loss (2,727) (1,669)
Accumulated deficit (642,741) (592,933)
Total stockholders’ equity 74,528 100,482
Total liabilities and stockholders’ equity $ 109,494 $ 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 — 17 shares at June 30, 2015 and 43 at December 31, 2014