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
Condensed Consolidated Statements of Comprehensive Loss
Net loss	$ (11,417,821)	$ (12,468,547)	$ (21,163,460)	$ (17,383,940)
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) on available-for-sale debt securities	(105,020)	(55,891)	250,643	(16,382)
Reclassification of realized (gain) loss on available-for-sale debt securities to earnings	27,669	(29,067)	(18,800)	(21,809)
Foreign currency translation adjustments	23,773	(19,348)	19,834	(30,964)
Other comprehensive income (loss)	(53,578)	(104,306)	251,677	(69,155)
Total comprehensive loss	$ (11,471,399)	$ (12,572,853)	$ (20,911,783)	$ (17,453,095)