Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net and comprehensive loss	$ (14,176,441)	$ (13,415,523)
Adjustments to reconcile net and comprehensive loss to net cash used in (provided by) operating activities:
Depreciation	33,503	23,665
Stock-based compensation	1,226,346	1,957,478
Changes in operating assets and liabilities:
Prepaid research and development contracts	386,344	(115,705)
Other current assets	351,376	108,760
Accounts payable and other current liabilities	(2,045,456)	(626,707)
Deferred revenue		18,666,667
Net cash (used in) provided by operating activities	(14,224,328)	6,598,635
Investing activities:
Purchase of furniture and equipment	(232,672)	(8,498)
Net cash used in investing activities	(232,672)	(8,498)
Financing activities:
Proceeds from exercise of stock options		23,652
Proceeds from issuance of common stock		44,998,801
Cash paid in connection with the sale of common stock		(3,093,489)
Net cash provided by financing activities		41,928,964
Net (decrease) increase in cash and cash equivalents	(14,457,000)	48,519,101
Cash and cash equivalents at beginning of year	62,614,010	20,264,109
Cash and cash equivalents, six months ended	$ 48,157,010	$ 68,783,210