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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 44,812 $ 49,511
Marketable securities available-for-sale 151,313 73,141
Accounts receivable 1,394 727
Prepaid expenses and other current assets 2,427 4,058
Total current assets 199,946 127,437
Property and equipment, net 13,804 7,924
Goodwill 2,043 2,277
Restricted cash 609 632
Other assets 231 20
Total assets 216,633 138,290
Current liabilities:    
Accounts payable 3,433 1,159
Accrued research and development 7,361 6,938
Accrued liabilities 15,337 6,317
Deferred revenues 2,654 5,865
Total current liabilities 28,785 20,279
Deferred revenues, net of current portion   6,900
Long term debt   9,559
Other long-term liabilities 769 1,070
Total liabilities $ 29,554 $ 37,808
Commitments and contingencies (Note 7)
Stockholders’ equity:    
Common stock: $0.001 par value; 69,500 shares authorized at December 31, 2015 and 2014, respectively; 38,446 and 26,307 shares issued and outstanding at December 31, 2015 and 2014, respectively $ 38 $ 26
Additional paid-in capital 889,698 695,058
Accumulated other comprehensive loss (2,930) (1,669)
Accumulated deficit (699,727) (592,933)
Total stockholders’ equity 187,079 100,482
Total liabilities and stockholders’ equity $ 216,633 $ 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 at December 31, 2015 and 43 shares at December 31, 2014