Marketable Securities - Summary of Other Investment Income (Loss), Net (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Gain on Sales of Marketable Securities, net	$ 0	$ 1,019,877	$ 20,107	$ 1,051,768
Changes in Fair Value of Marketable Securities	16,623,670	0	(9,275,149)
Total Other Investment Income (Loss), net	$ 16,623,670	$ 1,019,877	$ (9,255,042)	$ 1,051,768

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration