Condensed Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net loss	$ (6,678,008)	$ (6,195,907)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	929,029	846,042
Non-cash interest		20,724
Change in fair value of warrant liability	1,810,835
Change in operating assets and liabilities:
Prepaid expenses and other assets	(312,224)	333,952
Accounts payable and accrued expenses	467,338	75,062
Net cash used in operating activities	(3,783,030)	(4,920,127)
Financing activities
Proceeds from issuance of common stock, net	7,332,239	358,023
Net cash provided by financing activities	7,332,239	358,023
Net increase (decrease) in cash and cash equivalents	3,549,209	(4,562,104)
Cash and cash equivalents at beginning of period	9,007,071	8,691,155
Cash and cash equivalents at end of period	$ 12,556,280	4,129,051
Supplemental disclosure of cash flow information
Interest paid		$ 125,813