Condensed Consolidated Statements of Comprehensive Loss - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (5,411,788)	$ (4,740,232)	$ (16,580,237)	$ (14,908,348)
Other comprehensive income (loss), net of tax effect:
Unrealized gain (loss) on short-term investments	(17,501)	(1,864)	4,060	2,308
Foreign currency translation adjustment	1,225	37,575	7,631	34,820
Total other comprehensive income (loss)	(16,276)	35,711	11,691	37,128
Comprehensive loss	$ (5,428,064)	$ (4,704,521)	$ (16,568,546)	$ (14,871,220)