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Stockholders' Equity (Details 2) - Employee Stock Option [Member] - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]      
Reserved but unissued shares under the Plan, beginning of year 993,860 882,815  
Granted - Options to Purchase Common Stock 224,000 127,000  
Exercised - Options to Purchase Common Stock 0 0  
Forfeited/Expired/Exchanged - Options to Purchase Common Stock (337,583) (15,955)  
Reserved but unissued shares under the Plan, end of year 880,277 993,860 882,815
Exercisable - Options to Purchase Common Stock 587,962 754,989  
Outstanding - Weighted Average Exercise Price $ 4.81 $ 4.98  
Granted - Weighted Average Exercise Price 1.94 3.69  
Exercised - Weighted Average Exercise Price 0 0  
Forfeited/Expired/Exchanged - Weighted Average Exercise Price 4.19 5.15  
Outstanding - Weighted Average Exercise Price 4.32 4.81 $ 4.98
Exercisable - Weighted Average Exercise Price $ 5.17 $ 4.98  
Granted - Weighted Average Remaining Contractual Life (in years) 9 years 2 months 23 days 9 years 5 months 23 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) 9 years 14 days 6 years 11 months 8 days 7 years 6 months 4 days
Exercisable - Weighted Average Remaining Contractual Life (in years) 6 years 5 months 26 days 6 years 3 months 25 days