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Stockholders' Equity (Details 1) - Stock option plans [Member]
 3 Months Ended
Mar. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Non-vested stock options as of January 1, 2019 | shares 334,000
Number of Shares, Non-vested stock options as of March 31, 2019 | shares 332,000
Number of Shares, Stock options granted during the three-month period ended March 31, 2019 | shares 10,000
Number of Shares, Stock options that vested during the three-month period ended March 31, 2019 | shares
Number of Shares, Stock options that were forfeited during the three-month period ended March 31, 2019 | shares 12,000
Weighted Average Fair Value at Grant Date, Non-vested stock options as of January 1, 2019 $ 3.63
Weighted Average Fair Value at Grant Date, Non-vested stock options as of March 31, 2019 3.65
Weighted Average Fair Value at Grant Date, Stock options granted during the three-month period ended March 31, 2019 3.16
Weighted Average Fair Value at Grant Date, Stock options that vested during the three-month period ended March 31, 2019
Weighted Average Fair Value at Grant Date, Stock options that were forfeited during the three-month period ended March 31, 2019 2.65
Weighted Average Exercise Price, Non-vested stock options as of January 1, 2019 6.64
Weighted Average Exercise Price, Non-vested stock options as of March 31, 2019 6.72
Weighted Average Exercise Price, Stock options granted during the three-month period ended March 31, 2019 7.50
Weighted Average Exercise Price, Stock options that vested during the three-month period ended March 31, 2019
Weighted Average Exercise Price, Stock options that were forfeited during the three-month period ended March 31, 2019 $ 5.07