Condensed Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (40,964,291)	$ (21,739,171)
Other comprehensive income (loss):
Unrealized loss on available-for-sale securities	(803,551)	(710,190)
Comprehensive loss	$ (41,767,842)	$ (22,449,361)