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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:            
Net loss $ (923,585) $ (1,996,556) $ (1,809,970) $ (2,733,555) $ (2,284,943) $ (2,135,140)
Adjustments to reconcile net loss to net cash used in operating activities:            
Depreciation and amortization   21,701 50,003 69,037 78,862 93,643
Stock-based compensation expense, including common stock issued for services   50,516 165,638 479,103 402,104 310,076
Changes in assets and liabilities:            
Grant funds receivable   79,341 140,909 61,568 125,339 (82,733)
Prepaid expenses and other current assets   (30,773) (20,631) (934) (1,268) (12,593)
Accounts payable and accrued expenses   (68,802) (142,116) (125,326) (14,686) (614,500)
Total adjustments   51,983 193,803 483,448 590,351 (306,107)
Net cash used in operating activities   (1,944,573) (1,616,167) (2,250,107) (1,694,592) $ (2,441,247)
Cash flows from investing activities:            
Purchase of property and equipment   (15,850) (35,503) (35,503) (86,603)
Net cash used in investing activities   (15,850) $ (35,503) $ (35,503) (86,603)
Cash flows from financing activities:            
Net proceeds after transaction costs   2,679,809 1,615,798 $ 1,999,032
Net cash provided by financing activities   2,679,809 $ 873,400 3,259,131 2,309,192
Net increase (decrease) in cash and cash equivalents   719,386 $ (1,651,670) (1,412,210) 1,477,936 (132,055)
Cash and cash equivalents at beginning of period 862,191 1,101,651 2,513,861 2,513,861 1,035,925 1,167,980
Cash and cash equivalents at end of period $ 1,101,651 $ 1,821,037 $ 862,191 $ 1,101,651 $ 2,513,861 $ 1,035,925