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Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 29,220 $ 49,748
Marketable securities 225,999 265,493
Prepaid expenses and other current assets 4,241 3,885
Receivables, net 5,114 4,445
Total current assets 264,574 323,571
Fixed assets, net 9,017 9,159
Deposits and other assets 231 489
Total assets 273,822 333,219
Current liabilities:    
Accounts payable and accrued expenses 23,082 29,121
Deferred revenue   3,354
Total current liabilities 23,082 32,475
Other long-term liabilities 2,159 2,277
Total liabilities 25,241 34,752
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 33,872,956 shares at June 30, 2015. Authorized 125,000,000 shares; issued and outstanding 32,898,392 shares at December 31, 2014 34 33
Additional paid-in capital 747,869 721,722
Accumulated other comprehensive loss (495) (737)
Accumulated deficit (498,827) (422,551)
Total stockholders' equity 248,581 298,467
Total liabilities and stockholders' equity $ 273,822 $ 333,219