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Stockholders' Equity (Details 3) - Employee Stock Option [Member] - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Reserved but unissued shares under the Plan, beginning of year 882,815 723,400  
Granted - Options to Purchase Common Stock 127,000 171,900  
Exercised - Options to Purchase Common Stock 0 0  
Forfeited/Expired/Exchanged - Options to Purchase Common Stock (15,955) (12,485)  
Reserved but unissued shares under the Plan, end of year 993,860 882,815 723,400
Exercisable - Options to Purchase Common Stock 754,989 547,532  
Outstanding - Weighted Average Exercise Price $ 4.98 $ 5.18  
Granted - Weighted Average Exercise Price 3.69 4.22  
Exercised - Weighted Average Exercise Price 0 0  
Forfeited/Expired/Exchanged - Weighted Average Exercise Price 5.15 6.17  
Outstanding - Weighted Average Exercise Price 4.81 4.98 $ 5.18
Exercisable - Weighted Average Exercise Price $ 4.98 $ 4.91  
Granted - Weighted Average Remaining Contractual Life (in years) 9 years 5 months 23 days 9 years 3 months 4 days  
Exercised - Weighted Average Remaining Contractual Life (in years) 0 years 0 years  
Forfeited/Expired/Exchanged - Weighted Average Remaining Contractual Life (in years) 0 years 0 years  
Outstanding - Weighted Average Remaining Contractual Life (in years) 6 years 11 months 8 days 7 years 6 months 4 days 8 years 1 month 6 days
Exercisable - Weighted Average Remaining Contractual Life (in years) 6 years 3 months 25 days 6 years 10 months 6 days