Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net loss	$ (32,484,146)	$ (10,640,376)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,133,530	1,256,310
Non-cash research and development license expense	7,155,337
Amortization of debt discount	177,652	107,433
Depreciation	5,436	11,439
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	103,725	111,668
Other assets	(3,700)	10,829
Accounts payable	1,248,389	(253,060)
Accrued expenses and other current liabilities	(1,609,407)	(103,453)
Net cash used in operating activities	(23,273,184)	(9,499,210)
Cash flows from investing activities
Purchases of equipment	(9,331)
Net cash used in investing activities	(9,331)
Cash flows from financing activities
Procceds from issuance of common stock upon financing, net		24,983,682
Proceeds from issuance of common stock upon exercise of options	629,756	410,162
Proceeds from issuance of term loan		20,000,000
Repayment of principal on term loan		(7,238,889)
Net cash (used in) provided by financing activities	629,756	38,154,955
Net (decrease) increase in cash	(22,652,759)	28,655,745
Cash at beginning of period	219,966,167	13,968,742
Cash at end of period	197,313,408	42,624,487
Supplemental disclosures of cash flow information:
Interest paid	$ 379,167	216,667
Supplemental disclosures of non-cash financing activity:
Issuance of warrants in connection with debt financing		$ 426,000