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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:          
Net loss $ (1,376,657) $ (1,295,455) $ (2,733,555) $ (2,284,943) $ (2,135,140)
Adjustments to reconcile net loss to net cash used in operating activities:          
Depreciation and amortization 14,467 32,744 69,037 78,862 93,643
Stock-based compensation expense 33,590 51,354 479,103 402,104 310,076
Changes in assets and liabilities:          
Grant funds receivable 40,041 140,909 61,568 125,339 (82,733)
Prepaid expenses and other current assets 4,609 14,408 (934) (1,268) (12,593)
Accounts payable and accrued expenses (5,934) (74,855) (125,326) (14,686) (614,500)
Total adjustments 86,773 164,560 483,448 590,351 (306,107)
Net cash used in operating activities (1,289,884) (1,130,895) (2,250,107) (1,694,592) $ (2,441,247)
Cash flows from investing activities:          
Purchase of property and equipment (15,850) (11,164) (35,503) (86,603)  
Net cash used in investing activities (15,850) $ (11,164) $ (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 1,374,075 $ (1,142,059) (1,412,210) 1,477,936 (132,055)
Cash and cash equivalents at beginning of period 1,101,651 2,513,861 2,513,861 1,035,925 1,167,980
Cash and cash equivalents at end of period $ 2,475,726 $ 1,371,802 $ 1,101,651 $ 2,513,861 $ 1,035,925