Condensed Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net loss	$ (5,707,427)	$ (5,805,448)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,055,103	1,161,266
Change in fair value of warrant liability		(433,392)
Change in operating assets and liabilities:
Prepaid expenses and other assets	(345,975)	(187,911)
Accounts payable and other current liabilities	383,896	(464,161)
Net cash used in operating activities	(4,614,403)	(5,729,646)
Financing activities
Proceeds from issuance of common stock, net	5,800,201	4,618,297
Net cash provided by financing activities	5,800,201	4,618,297
Net increase (decrease) in cash and cash equivalents	1,185,798	(1,111,349)
Cash and cash equivalents at beginning of period	5,319,004	7,679,267
Cash and cash equivalents at end of period	$ 6,504,802	6,567,918
Non-cash financing activities
Reclassification of warrant liability to equity due to amendment of warrants		$ 3,267,885