Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net and comprehensive loss	$ (4,647,930)	$ 11,537,478	$ (18,824,371)	$ (1,878,046)
Adjustments to reconcile net and comprehensive loss to net cash (used in) provided by operating activities:
Depreciation			53,692	35,312
Stock-based compensation	645,899	806,411	1,872,245	2,763,890
Changes in operating assets and liabilities:
Prepaid research and development contracts			216,092	(24,052)
Other current assets			(260,811)	(572,870)
Accounts payable and other current liabilities			(2,044,301)	52,521
Net cash (used in) provided by operating activities			(18,987,454)	376,755
Investing activities:
Purchase of furniture and equipment			(236,953)	(29,380)
Net cash used in investing activities			(236,953)	(29,380)
Financing activities:
Proceeds from exercise of stock options				76,756
Proceeds from issuance of common stock				51,621,570
Cash paid in connection with the sale of common stock		(409,054)		(3,502,543)
Net cash provided by financing activities				48,195,783
Net (decrease) increase in cash and cash equivalents			(19,224,407)	48,543,158
Cash and cash equivalents at beginning of year			62,614,010	20,264,109
Cash and cash equivalents, nine months ended	$ 43,389,603	$ 68,807,267	$ 43,389,603	$ 68,807,267