Other Income (Expense) - Schedule of Other Nonoperating Income (Expense) (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair value adjustments on equity investments	$ 8,134,213	$ (1,196,676)	$ 8,117,178	$ (932,983)	$ (5,459,462)
Fair value adjustments on variable note receivable		(5,428,542)	(815,937)	(7,424,727)
Fair value adjustments on warrants issued	(3,181,114)		(2,060,771)
Fair value adjustments on contingent consideration	442,991		425,426
Other	1,036,793	39,678	1,835,670	388,277
Total Other Income (Expense)	$ 6,432,883	$ (6,585,540)	$ 7,501,566	$ (7,969,433)