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Stockholders' Equity (Details 1) - Stock option plans [Member]
 12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Non-vested stock options as of January 1, 2018 | shares 205,000
Number of Shares, Non-vested stock options as of December 31, 2018 | shares 334,000
Number of Shares, Stock options granted during the year ended December 31, 2018 | shares 171,000
Number of Shares, Stock options that vested during the year ended December 31, 2018 | shares 12,000
Number of Shares, Stock options that were forfeited during the year ended December 31, 2018 | shares 30,000
Weighted Average Fair Value at Grant Date, Non-vested stock options as of January 1, 2018 $ 3.49
Weighted Average Fair Value at Grant Date, Non-vested stock options as of December 31, 2018 3.63
Weighted Average Fair Value at Grant Date, Stock options granted during the year ended December 31, 2018 3.83
Weighted Average Fair Value at Grant Date, Stock options that vested during the year ended December 31, 2018 3.55
Weighted Average Fair Value at Grant Date, Stock options that were forfeited during the year ended December 31, 2018 3.78
Weighted Average Exercise Price, Non-vested stock options as of January 1, 2018 6.07
Weighted Average Exercise Price, Non-vested stock options as of December 31, 2018 6.64
Weighted Average Exercise Price, Stock options granted during the year ended December 31, 2018 7.38
Weighted Average Exercise Price, Stock options that vested during the year ended December 31, 2018 7.52
Weighted Average Exercise Price, Stock options that were forfeited during the year ended December 31, 2018 $ 6.63