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Balance sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 115,855 $ 15,414
Marketable securities 130,730 127,053
Prepaid expenses and other current assets 1,957 1,599
Grant and collaboration receivables, net 838 958
Total current assets 249,380 145,024
Fixed assets, net 6,328 6,730
Deposits and other assets 132 149
Total assets 255,840 151,903
Current liabilities:    
Accounts payable and accrued expenses 8,735 12,207
Current portion of long-term debt 12 49
Deferred revenue 492 878
Total current liabilities 9,239 13,134
Other long-term liabilities 2,259 2,227
Total liabilities 11,498 15,361
Stockholders' equity:    
Preferred stock, $0.001 par value. Undesignated 5,000,000 shares; issued and outstanding 0 shares at March 31, 2014 and December 31, 2013      
Common stock, $0.001 par value. Authorized 125,000,000 shares; issued and outstanding 29,325,997 shares at March 31, 2014. Authorized 125,000,000 shares; issued and outstanding 23,803,282 shares at December 31, 2013 30 24
Additional paid-in capital 587,128 465,246
Accumulated other comprehensive loss 80 70
Accumulated deficit (342,896) (328,798)
Total stockholders' equity 244,342 136,542
Total liabilities and stockholders' equity $ 255,840 $ 151,903