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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 58,022 $ 49,748
Marketable securities 280,903 265,493
Prepaid expenses and other current assets 5,930 3,885
Trade receivables, net 11,094 4,445
Total current assets 355,949 323,571
Fixed assets, net 8,974 9,159
Deposits and other assets 3,118 489
Total assets 368,041 333,219
Current liabilities:    
Accounts payable and accrued expenses 45,247 29,121
Deferred revenue 139 3,354
Total current liabilities 45,386 32,475
Long-term debt 94,608  
Other long-term liabilities 2,046 2,277
Total liabilities 142,040 34,752
Stockholders' equity:    
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 33,916,559 shares at December 31, 2015. Authorized 125,000,000 shares; issued and outstanding 32,898,392 shares at December 31, 2014 34 33
Additional paid-in capital 820,165 721,722
Accumulated other comprehensive loss (1,200) (737)
Accumulated deficit (592,998) (422,551)
Total stockholders' equity 226,001 298,467
Total liabilities and stockholders' equity $ 368,041 $ 333,219