Condensed Consolidated Statements of Comprehensive Loss - 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	$ (2,614,952)	$ (5,710,551)	$ (7,463,259)	$ (11,168,449)
Other comprehensive income (loss), net of tax effect:
Unrealized gain (loss) on short-term investments	0	(26,136)	0	21,561
Foreign currency translation adjustment	(145)	909	(1,702)	6,406
Total other comprehensive income (loss)	(145)	(25,227)	(1,702)	27,967
Comprehensive loss	$ (2,615,097)	$ (5,735,778)	$ (7,464,961)	$ (11,140,482)