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Income Taxes (Operating Loss Carryforwards, Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2017
Operating Loss Carryforwards [Line Items]
Cumulative effect from change in accounting principle (Note 12)		$ 1,082,924
Deferred tax asset, net of related valuation allowance				$ 17,000,000
Valuation allowance	$ 15,632,235	388,500		15,900,000
Deferred Tax Assets, Net	87,210	3,119,930
Valuation allowance for deferred tax assets:
Operating Loss Carryforwards [Line Items]
Charged to costs and expenses	(665,039)	203,003	$ 33,423
Retained earnings
Operating Loss Carryforwards [Line Items]
Cumulative effect from change in accounting principle (Note 12)		$ 1,082,924
Retained earnings | Accounting Standards Update 2016-09
Operating Loss Carryforwards [Line Items]
Cumulative effect from change in accounting principle (Note 12)				1,100,000
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	51,519,487
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 55,942,341
Exercise of NonQualified Stock Options | Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards				$ 44,100,000

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Amount of increase in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses.

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