Investments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Equity Securities without Readily Determinable Fair Value
Cost of investment	$ 3,000,000		$ 3,000,000		$ 3,000,000
Cumulative impairment	0		0		0
Cumulative upward adjustment	1,150,000		1,150,000		1,150,000
Carrying amount of investment	4,150,000		4,150,000		$ 4,150,000
Equity Securities, Gain (Loss)
Realized gain (loss)	$ 0	$ 0
Unrealized gain			$ 0	$ 1,200,000