Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities
Net loss	$ (11,921,069)	$ (9,221,188)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,404,926	1,298,279
Non-cash interest		120,889
Financing costs allocated to warrant liability		533,692
Change in fair value of warrant liability	3,354,973	198,945
Change in operating assets and liabilities:
Prepaid expenses and other assets	(59,020)	408,030
Accounts payable and accrued expenses	1,236,986	(676,745)
Net cash used in operating activities	(5,983,204)	(7,338,098)
Financing activities
Payment of bank loan		(4,500,000)
Proceeds from issuance of common stock, net	7,389,101	358,023
Proceeds from issuance of common stock and warrants, net		13,168,802
Net cash provided by financing activities	7,389,101	9,026,825
Net increase in cash and cash equivalents	1,405,897	1,688,727
Cash and cash equivalents at beginning of period	9,007,071	8,691,155
Cash and cash equivalents at end of period	$ 10,412,968	10,379,882
Supplemental disclosure of cash flow information
Interest paid		169,813
Non-cash financing activities
Fair value of warrants issued to placement agent		$ 369,863