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Stock-based Compensation (Details 1) - Employee Stock Option [Member] - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Schedule Of Share Based Compensation Stock Options Activity [Line Items]    
Stock Options, Outstanding Beginning balance 615,000  
Stock Options, Outstanding Ending balance 615,000 615,000
Stock Options, Exercisable 395,000  
Grant Date Weighted-Average Exercise Price, Beginning balance $ 2.87  
Grant Date Weighted-Average Exercise Price, Ending balance 2.87 $ 2.87
Grant Date Weighted Average Exercise Price, Exercisable $ 2.86  
Weighted Average Remaining Contractual Life (Years), Balance 3 years 2 months 23 days 3 years 5 months 23 days
Weighted Average Remaining Contractual Life (Years), Exercisable 3 years 1 month 13 days  
Intrinsic Value, Outstanding Beginning balance $ 0  
Intrinsic Value, Outstanding Ending balance 0 $ 0
Intrinsic Value, Exercisable at March 31, 2018 $ 19,000