Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net and comprehensive loss	$ (3,918,663)	$ (8,492,825)
Adjustments to reconcile net and comprehensive loss to net cash used in operating activities:
Depreciation	15,102	12,990
Stock-based compensation	327,467	621,685
Consulting expenses related to warrants	62,347
Changes in operating assets and liabilities:
Prepaid research and development contracts	82,492	413,978
Other current assets	167,287	79,507
Accounts payable and other current liabilities	(675,858)	(1,713,530)
Net cash used in operating activities	(3,939,826)	(9,078,195)
Investing activities:
Purchase of furniture and equipment		(113,283)
Net cash used in investing activities		(113,283)
Financing activities:
Net decrease in cash and cash equivalents	(3,939,826)	(9,191,478)
Cash and cash equivalents at beginning of year	38,524,536	62,614,010
Cash and cash equivalents, three months ended	$ 34,584,710	$ 53,422,532