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Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (50,288,562) $ (25,226,539) $ (91,252,853) $ (46,965,710)
Other comprehensive income (loss):        
Unrealized gain (loss) on available-for-sale securities (243,789) 2,266,738 (1,047,340) 1,556,548
Comprehensive loss $ (50,532,351) $ (22,959,801) $ (92,300,193) $ (45,409,162)