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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
Sep. 30, 2015
Dec. 31, 2014
CURRENT ASSETS    
Cash and cash equivalents $ 4,218,409 $ 8,034,765
Marketable securities 12,999,445 0
Restricted cash 0 2,977,024
Grant receivable 403,425 360,233
Prepaid expenses and other current assets 92,476 235,523
TOTAL CURRENT ASSETS 17,713,755 11,607,545
PROPERTY AND EQUIPMENT, net 332,143 229,455
OTHER ASSETS    
Intangible assets, net of accumulated amortization of $86,492 and $49,930, respectively 203,190 239,752
In-process research and development, net of accumulated amortization of $0 1,500,000 1,500,000
Other assets 133,201 55,320
TOTAL ASSETS 19,882,289 13,632,072
CURRENT LIABILITIES    
Accounts payable and accrued expenses 2,308,677 1,699,254
Accounts payable and accrued expenses, related party 579,657 433,712
Deferred revenue, current 3,645,834 4,166,667
TOTAL CURRENT LIABILITIES 6,534,168 6,299,633
LONG-TERM LIABILITIES    
Deferred revenue, net of current portion 1,822,916 4,166,666
Loan payable 9,155,857 9,155,857
Accrued interest 443,682 258,639
TOTAL LONG-TERM LIABILITIES 11,422,455 13,581,162
TOTAL LIABILITIES 17,956,623 19,880,795
STOCKHOLDERS' EQUITY (DEFICIT)    
Preferred stock, $0.001 par value, 5,000,000 shares authorized, none issued and outstanding 0 0
Common stock, $0.001 par value, 50,000,000 shares authorized, 16,254,985 and 11,707,051 shares issued and outstanding, respectively 16,255 11,707
Additional paid-in capital 33,723,806 16,054,697
Accumulated other comprehensive income 11,949 0
Accumulated deficit (31,826,344) (22,315,127)
TOTAL STOCKHOLDERS' EQUITY (DEFICIT) 1,925,666 (6,248,723)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT) $ 19,882,289 $ 13,632,072