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Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 140,712 $ 49,748
Marketable securities 230,809 265,493
Prepaid expenses and other current assets 4,627 3,885
Receivables, net 8,016 4,445
Total current assets 384,164 323,571
Fixed assets, net 8,799 9,159
Deposits and other assets 3,137 489
Total assets 396,100 333,219
Current liabilities:    
Accounts payable and accrued expenses 31,695 29,121
Deferred revenue   3,354
Total current liabilities 31,695 32,475
Long-term debt 93,198  
Other long-term liabilities 2,056 2,277
Total liabilities 126,949 34,752
Stockholders' equity:    
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 33,915,059 shares at September 30, 2015. Authorized 125,000,000 shares; issued and outstanding 32,898,392 shares at December 31, 2014 34 33
Additional paid-in capital 812,294 721,722
Accumulated other comprehensive loss (1,127) (737)
Accumulated deficit (542,050) (422,551)
Total stockholders' equity 269,151 298,467
Total liabilities and stockholders' equity $ 396,100 $ 333,219