Summary of Significant Accounting Policies (Components of Accumulated Other Comprehensive Loss) (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
December 31, 2017	$ 49,170,727
March 31, 2018	47,485,221
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
December 31, 2017	(625,000)
Net current period change	33,000
March 31, 2018	(592,000)
Unrealized (Loss)/Gain On Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
December 31, 2017	12,000
Net current period change	(6,000)
March 31, 2018	6,000
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
December 31, 2017	(613,379)
Net current period change	27,000
March 31, 2018	$ (585,717)