Condensed Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net loss	$ (5,052,039)	$ (3,225,409)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	464,158	418,912
Non-cash interest		10,362
Change in fair value of warrant liability	3,072,747
Change in operating assets and liabilities:
Prepaid expenses and other assets	104,184	68,555
Accounts payable and accrued expenses	(275,862)	37,379
Net cash used in operating activities	(1,686,812)	(2,690,201)
Financing activities
Proceeds from issuance of common stock, net	7,334,739	98,744
Net cash provided by financing activities	7,334,739	98,744
Net increase (decrease) in cash and cash equivalents	5,647,927	(2,591,457)
Cash and cash equivalents at beginning of period	9,007,071	8,691,155
Cash and cash equivalents at end of period	$ 14,654,998	6,099,698
Supplemental disclosure of cash flow information
Interest paid		$ 62,563