Marketable Securities - Summary of Dividend and Other Investment Income (Loss), Net (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Dividend Income	$ (23,453,572)	$ 1,883,131
Gain on Sales of Marketable Securities, net	20,107	31,891
Changes in Fair Value of Marketable Securities	(25,898,819)	0
Total Dividend and Other Investment Income (Loss), net	$ (23,453,572)	$ 1,883,131