Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities
Net loss	$ (9,221,188)	$ (9,497,311)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,298,279	1,127,813
Non-cash interest	120,889	45,521
Deferred rent expense		(9,227)
Financing costs allocated to warrant liability	533,692
Change in fair value of warrant liability	198,945
Change in operating assets and liabilities:
Prepaid expenses and other assets	408,030	(4,405)
Accounts payable and accrued expenses	(676,745)	294,244
Net cash used in operating activities	(7,338,098)	(8,043,365)
Financing activities
Payment of bank loan	(4,500,000)
Proceeds from issuance of common stock, net	358,023	4,626,373
Proceeds from issuance of common stock and warrants, net	13,168,802
Net cash provided by financing activities	9,026,825	4,626,373
Net increase (decrease) in cash and cash equivalents	1,688,727	(3,416,992)
Cash and cash equivalents at beginning of period	8,691,155	14,155,809
Cash and cash equivalents at end of period	10,379,882	10,738,817
Supplemental disclosure of cash flow information
Interest paid	169,813	167,750
Non-cash financing activities
Deferred financing costs paid in prior year		$ 137,812
Fair value of warrants issued to placement agent	$ 369,863