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Stockholders' Equity (Details 1) - Stock option plans [Member]
 9 Months Ended
Sep. 30, 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
Non-vested stock options as of September 30, 2019 | shares 292,000
Number of Shares, Stock options granted during the nine-month period ended September 30, 2019 | shares 20,000
Number of Shares, Stock options that vested during the nine-month period ended September 30, 2019 | shares 34,000
Number of Shares, Stock options that were forfeited during the nine-month period ended September 30, 2019 | shares 29,000
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 September 30, 2019 3.58
Weighted Average Fair Value at Grant Date, Stock options granted during the nine-month period ended September 30, 2019 3.31
Weighted Average Fair Value at Grant Date, Stock options that vested during the nine-month period ended September 30, 2019 4.09
Weighted Average Fair Value at Grant Date, Stock options that were forfeited during the nine-month period ended September 30, 2019 3.39
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 September 30, 2019 7.25
Weighted Average Exercise Price, Stock options granted during the nine-month period ended September 30, 2019 7.03
Weighted Average Exercise Price, Stock options that vested during the nine-month period ended September 30, 2019 6.87
Weighted Average Exercise Price, Stock options that were forfeited during the nine-month period ended September 30, 2019 $ 6.05