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Condensed Consolidated Balance Sheets (unaudited) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 48,726,443 $ 588,373,232
Restricted cash 4,500,000  
Marketable securities 551,849,110 100,157,618
Account receivable   1,000,000
Other receivables 7,415,611 7,443,654
Prepaid expenses and other current assets 15,242,798 6,113,122
Total current assets 627,733,962 703,087,626
Property, equipment and leasehold improvements, net 11,699,480 12,259,515
Operating lease right of use assets 4,564,666 1,992,669
Other assets 28,777 28,777
Total assets 644,026,885 717,368,587
Current liabilities:    
Accounts payable 4,975,367 7,121,879
Accrued expenses 13,472,966 18,859,840
Deferred revenue 22,150,861 22,150,861
Current portion of operating lease liability 1,221,152 952,840
Total current liabilities 41,820,346 49,085,420
Deferred revenue 14,862,802 22,938,233
Long term debt 1,000,000 2,000,000
Operating lease liability 3,396,563 1,087,422
Total liabilities 61,079,711 75,111,075
Commitments and Contingencies
Stockholders’ equity:    
Common stock, $0.001 par value; 48,994,869 and 48,455,741 shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively 48,995 48,455
Accumulated deficit (583,141,763) (491,888,910)
Additional paid-in capital 1,166,526,486 1,133,537,171
Accumulated other comprehensive income (loss) (486,544) 560,796
Total stockholders’ equity 582,947,174 642,257,512
Total liabilities and stockholders’ equity $ 644,026,885 $ 717,368,587