Condensed Consolidated Statements of Comprehensive Loss - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (5,710,551)	$ (4,797,270)	$ (11,168,449)	$ (10,168,116)
Other comprehensive income (loss), net of tax effect:
Unrealized gain (loss) on short-term investments	(26,136)	819	21,561	4,172
Foreign currency translation adjustment	909	(9,194)	6,406	(2,755)
Total other comprehensive income (loss)	(25,227)	(8,375)	27,967	1,417
Comprehensive loss	$ (5,735,778)	$ (4,805,645)	$ (11,140,482)	$ (10,166,699)