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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 26,190 $ 21,897
Short-term available-for-sale investments 128,841 82,219
Prepaid expenses and other current assets 5,603 1,910
Total current assets 160,634 106,026
Property and equipment, net 42 48
Other assets 426 48
Total assets 161,102 106,122
Current liabilities:    
Accounts payable 1,703 440
Accrued compensation 924 1,225
Income tax payable 1 1
License fee payable to Memorial Sloan Kettering Cancer Center ("MSK") 4,500  
Other accrued liabilities 4,516 1,058
Total current liabilities 11,644 2,724
Other long-term liabilities 203 216
Total liabilities $ 11,847 $ 2,940
Commitments and contingencies (Note 5)    
Stockholders’ equity:    
Preferred stock—$0.0001 par value, 20,000,000 shares authorized; none issued and outstanding as of June 30, 2015 and December 31, 2014    
Common stock—$0.0001 par value, 500,000,000 shares authorized; 24,151,734 and 19,692,937 shares issued and outstanding as of June 30, 2015 and December 31, 2014, respectively $ 2 $ 2
Additional paid-in capital 214,313 144,169
Accumulated other comprehensive loss (66) (100)
Accumulated deficit (64,994) (40,889)
Total stockholders’ equity 149,255 103,182
Total liabilities and stockholders’ equity $ 161,102 $ 106,122