Income Taxes - Components of Deferred Tax Asset (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Net federal operating loss carryforwards	$ 32,299,085	$ 18,911,435
Net foreign operating loss carryforwards	59,557	40,927
Net state operating loss carryforwards	20,000,317	11,842,460
Non-cash compensation	3,485,519	1,625,560
Research and development credits	10,366,683	7,651,781
Deferred finance costs		38,578
Interest Expense	985,431	400,946
Charitable Contribution	5,408	5,408
Fixed assets	11,401	8,595
Accrued expenses	1,200,754	732,958
Deferred tax asset, excluding valuation allowance	68,414,155	41,258,648
Deferred finance costs	(121,875)
Deferred tax liability, excluding valuation allowance	(121,875)
Less valuation allowance	(68,292,280)	(41,258,648)
Increase in valuation allowance	$ 27,000,000	$ 12,500,000	$ 6,700,000