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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (91,252,853) $ (46,965,710)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 2,313,395 1,252,573
Net accretion of bond discounts/premiums 2,673,364 823,694
Forgiveness of debt income (1,000,000) 0
Amortization of right to use assets 617,058 395,735
Stock-based compensation 24,895,874 13,874,670
Changes in operating assets and liabilities:    
Account receivable 1,000,000 0
Other receivables 28,043 2,716,511
Prepaid expenses and other current assets (9,129,676) 404,665
Accounts payable (2,442,944) (2,279,547)
Accrued expenses (5,386,874) (198,444)
Deferred revenue (8,075,431) (7,952,998)
Operating lease liabilities (611,602) (423,096)
Net cash used in operating activities (86,371,646) (38,351,947)
Cash flows from investing activities:    
Purchase of marketable securities (537,970,196) (41,196,165)
Maturities of marketable securities 82,558,000 88,253,053
Sales of marketable securities 0 4,234,116
Purchase of property, equipment and leasehold improvements (1,456,928) (3,186,093)
Net cash (used in) provided by investing activities (456,869,124) 48,104,911
Cash flows from financing activities:    
Proceeds from exercise of stock options 8,093,981 2,629,635
Net cash provided by financing activities 8,093,981 2,629,635
Net increase (decrease) in cash, cash equivalents and restricted cash (535,146,789) 12,382,599
Cash, cash equivalents and restricted cash, beginning of the period 588,373,232 9,211,057
Cash, cash equivalents and restricted cash, end of the period 53,226,443 21,593,656
Supplemental disclosure of cash flow information:    
Purchases of property, equipment and leasehold improvements unpaid at period end 296,432 152,477
Cash paid for interest $ 10,833 $ 32,500