Stock-based Compensation (Details) - Employee Stock Option [Member] - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Share Based Compensation Stock Options Activity [Line Items]
Stock Options, Outstanding Beginning balance	615,000
Stock Options, Granted	16,000
Stock Options, Forfeited	(18,000)
Stock Options, Outstanding Ending balance	613,000	615,000
Stock Options, Exercisable	382,000
Grant Date Weighted-Average Exercise Price, Beginning balance	$ 2.87
Grant Date Weighted-Average Exercise Price, Granted	2.68
Grant Date Weighted-Average Exercise Price, Forfeited	3.15
Grant Date Weighted-Average Exercise Price, Ending balance	2.85	$ 2.87
Grant Date Weighted Average Exercise Price, Exercisable	$ 2.86
Weighted Average Remaining Contractual Life (Years), Balance	3 years 2 months 5 days	3 years 5 months 23 days
Weighted Average Remaining Contractual Life (Years), Granted	6 years 11 months 16 days
Weighted Average Remaining Contractual Life (Years), Exercisable	3 years 14 days
Intrinsic Value, Outstanding	$ 32,000	$ 0
Intrinsic Value, Exercisable at June 30, 2018	$ 0