Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (40,964,291)	$ (21,739,171)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,148,010	617,469
Net accretion of bond discounts/premiums	978,132	366,132
Amortization of right to use assets	305,140	169,904
Stock-based compensation	10,327,658	6,119,711
Changes in operating assets and liabilities:
Account receivable	1,000,000	0
Other receivables	2,268,276	2,402,390
Prepaid expenses and other current assets	(2,096,766)	243,036
Accounts payable	1,772,142	(1,911,635)
Accrued expenses	(10,858,639)	(819,180)
Deferred revenue	(2,537,715)	(2,211,793)
Operating lease liabilities	(310,412)	(186,824)
Net cash used in operating activities	(38,968,465)	(16,949,961)
Cash flows from investing activities:
Purchase of marketable securities	(240,502,151)	(8,605,116)
Maturities of marketable securities	33,675,000	52,462,085
Purchase of property, equipment and leasehold improvements	(989,902)	(1,362,224)
Net cash (used in) provided by investing activities	(207,817,053)	42,494,745
Cash flows from financing activities:
Proceeds from exercise of stock options	4,480,692	1,350,482
Net cash provided by financing activities	4,480,692	1,350,482
Net (decrease) increase in cash and cash equivalents	(242,304,826)	26,895,266
Cash and cash equivalents, beginning of the period	588,373,232	9,211,057
Cash and cash equivalents, end of the period	346,068,406	36,106,323
Supplemental disclosure of cash flow information:
Purchases of property, equipment and leasehold improvements unpaid at period end	108,917	375,602
Cash paid for interest	$ 16,250	$ 16,250