Condensed Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net loss	$ (4,079,362)	$ (4,285,980)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	723,800	781,204
Change in fair value of warrant liability		(433,392)
Change in operating assets and liabilities:
Prepaid expenses and other assets	285,496	167,364
Accounts payable and other current liabilities	(485,247)	(808,904)
Net cash used in operating activities	(3,555,313)	(4,579,708)
Financing activities
Proceeds from issuance of common stock, net	5,676,388	3,431,520
Net cash provided by financing activities	5,676,388	3,431,520
Net increase (decrease) in cash and cash equivalents	2,121,075	(1,148,188)
Cash and cash equivalents at beginning of period	5,319,004	7,679,267
Cash and cash equivalents at end of period	$ 7,440,079	6,531,079
Non-cash financing activities
Reclassification of warrant liability to equity due to amendment of warrants		$ 3,267,885