Income Taxes (Schedule of Deferred Tax Assets) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Net operating loss carryforwards	$ 12,207,686	$ 16,432,788
Accrued expenses and reserves	172,212	203,045
Compensatory stock options and warrants	165,946	228,672
Other	1,252	5,407
Total deferred tax assets	12,547,096	16,869,912
Valuation allowance	(12,547,096)	(16,869,912)
Net deferred tax assets