Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net loss	$ (102,900,600)	$ (68,345,186)	$ (30,965,464)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	14,756,206	6,115,160	1,754,974
Non-cash research and development license expense	7,155,337
Amortization of debt discount	786,750	649,993	375,635
Loss on extinguishment of debt	1,247,012
Amortization of operating lease right-of-use asset	53,854
Change in fair value of warrants			(2,791,000)
Change in operating lease liability	8,967
Depreciation	23,864	37,330	48,935
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	264,722	833,265	32,058
Other assets	(177,500)	(27,530)	75,607
Accounts payable	2,560,697	7,256,080	251,789
Accrued expenses and other current liabilities	(2,235,878)	7,105,829	1,163,765
Net cash used in operating activities	(78,456,569)	(46,375,059)	(30,053,701)
Cash flows from investing activities
Purchases of equipment	(45,891)	(16,121)	(32,696)
Net cash used in investing activities	(45,891)	(16,121)	(32,696)
Cash flows from financing activities
Proceeds from issuance of term loan	50,000,000	20,000,000
Payment of debt issuance costs	(1,102,609)		(25,997)
Repayment of principal on term loan	(21,660,000)	(7,238,889)	(3,333,333)
Proceeds from issuance of common stock upon financing, net	14,125,506	238,233,817	12,881,321
Proceeds from issuance of common stock upon exercise of warrants		249,836	131,703
Proceeds from issuance of common stock upon exercise of options	1,049,849	1,143,841	380,322
Net cash provided by financing activities	42,412,746	252,388,605	10,034,016
Net (decrease) increase in cash	(36,089,714)	205,997,425	(20,052,381)
Cash at beginning of period	219,966,167	13,968,742	34,021,123
Cash at end of period	183,876,453	219,966,167	13,968,742
Supplemental disclosures of cash flow information:
Interest paid	2,097,292	1,287,506	771,966
Operating lease right-of-use asset obtained in exchange for operating lease liability	1,793,328
Supplemental disclosures of non-cash financing activity:
Issuance of warrants in connection with debt financing	$ 884,216	$ 387,000	$ 37,842