Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities:
Net and comprehensive loss	$ (1,878,046)	$ (15,165,577)
Adjustments to reconcile net and comprehensive loss to net cash provided by (used in) operating activities:
Depreciation	35,312	39,269
Stock-based compensation	2,763,890	394,268
Amortization of debt issuance costs		75,561
Interest expense related to convertible note conversion		204,929
Changes in operating assets and liabilities:
Prepaid research and development contracts	(24,052)	238,658
Other current assets	(572,870)	(656,896)
Accounts payable and other current liabilities	52,521	598,706
Net cash provided by (used in) operating activities	376,755	(14,271,082)
Investing activities:
Purchase of furniture and equipment	(29,380)	(6,547)
Net cash used in investing activities	(29,380)	(6,547)
Financing activities:
Proceeds from exercise of stock options	76,756	36,101
Proceeds from issuances of convertible notes		297,354
Proceeds from sale of common stock	51,621,570	40,247,775
Cash paid in connection with the sale of common stock	(3,502,543)	(3,084,385)
Net cash provided by financing activities	48,195,783	37,496,845
Net increase in cash and cash equivalents	48,543,158	23,219,216
Cash and cash equivalents at beginning of year	20,264,109	1,609,694
Cash and cash equivalents, nine months ended	$ 68,807,267	24,828,910
Non-cash financing activities
Conversion of redeemable convertible preferred stock into common stock		74,701,187
Conversion of convertible notes and accrued interest into common stock		13,447,934
Accretion of redeemable convertible preferred stock to redemption value		$ 943,297