Condensed Consolidated Statements of Comprehensive Loss - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (4,490,622)	$ (5,411,788)	$ (11,953,881)	$ (16,580,237)
Other comprehensive income (loss), net of tax effect:
Unrealized gain (loss) on short-term investments	0	(17,501)	0	4,060
Foreign currency translation adjustment	(1,013)	1,225	(2,715)	7,631
Total other comprehensive income (loss)	(1,013)	(16,276)	(2,715)	11,691
Comprehensive loss	$ (4,491,635)	$ (5,428,064)	$ (11,956,596)	$ (16,568,546)