Consolidated Statements of Operations and Comprehensive Loss - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 2,937,991	$ 643,978	$ 5,872,321	$ 5,225,600
Operating expenses:
Research and development	17,041,975	8,729,697	40,823,756	14,892,464
General and administrative	4,220,238	2,187,661	9,097,511	6,485,960
Impairment charges		1,000,000		1,000,000
Total operating expenses	21,262,213	11,917,358	49,921,267	22,378,424
Loss from operations	(18,324,222)	(11,273,380)	(44,048,946)	(17,152,824)
Other income (expense):
Changes in fair value of warrant liability		76,000		30,000
Interest expense	(2,275)	(756)	(7,468)	(2,244)
Interest income	45,127	224,058	278,154	649,268
Other income (expense), net	29,218	(23,734)	48,882	(6,206)
Total other income, net	72,070	275,568	319,568	670,818
Net loss before income tax benefit	(18,252,152)	(10,997,812)	(43,729,378)	(16,482,006)
Income tax benefit	482,017	58,500	5,306,678	58,500
Net loss	(17,770,135)	(10,939,312)	(38,422,700)	(16,423,506)
Other comprehensive loss – unrealized (loss) gain on investments	(10,569)	18,953	(22,116)	18,953
Comprehensive loss	(17,780,704)	(10,920,359)	(38,444,816)	(16,404,553)
Net loss	(17,770,135)	(10,939,312)	(38,422,700)	(16,423,506)
Deemed dividends				(452,925)
Net loss attributed to common stockholders	$ (17,770,135)	$ (10,939,312)	$ (38,422,700)	$ (16,876,431)
Net loss per share attributed to common stockholders, basic and diluted	$ (0.54)	$ (0.74)	$ (1.74)	$ (1.35)
Weighted-average common shares outstanding, basic and diluted	33,056,971	14,768,931	22,058,424	12,481,494