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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Schedule of activity under the stock option plans |
|  | 2000 Plan |  |  | 2010 Plan |  |  | 2017 Plan |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value(1) |
Outstanding at December 31, 2018 |  |  | 12,500 |  |  |  | 270,000 |  |  |  | 111,500 |  |  | $ | 6.37 |  |  | $ | 266,020 |
Grants |  |  | — |  |  |  | 26,000 |  |  |  | 25,000 |  |  | $ | 5.90 |  |  |  |  |
Terminations |  |  | — |  |  |  | (26,000 | ) |  |  | (3,000 | ) |  | $ | 6.05 |  |  |  |  |
Exercises |  |  | (12,500 | ) |  |  | (15,000 | ) |  |  | — |  |  | $ | 4.37 |  |  |  |  |
Outstanding at December 31, 2019 |  |  | — |  |  |  | 255,000 |  |  |  | 133,500 |  |  | $ | 6.48 |  |  | $ | (516,475 | )
Grants |  |  | — |  |  |  | 7,000 |  |  |  | 37,000 |  |  | $ | 4.40 |  |  |  |  |
Terminations |  |  | — |  |  |  | (8,000 | ) |  |  | (4,000 | ) |  | $ | 5.53 |  |  |  |  |
Exercises |  |  | — |  |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Outstanding at June 30, 2020 |  |  | — |  |  |  | 254,000 |  |  |  | 166,500 |  |  | $ | 6.29 |  |  | $ | (655,695 | )
Vested at June 30, 2020 |  |  | — |  |  |  | 165,500 |  |  |  | 10,000 |  |  | $ | 6.04 |  |  | $ | (229,450 | )
Vested and expected to vest at |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
June 30, 2020 |  |  | — |  |  |  | 254,000 |  |  |  | 166,500 |  |  | $ | 6.29 |  |  | $ | (655,695 | )
Reserved for future grants |  |  | — |  |  |  | — |  |  |  | 133,500 |  |  |  |  |  |  |  |  |
(1) | Intrinsic value is the difference between the fair market value as of the date indicated and as of the date of the option grant.
Schedule of additional information about the stock option plans |
|  | Number of Shares |  |  | Weighted Average Fair Value at Grant Date |  |  | Weighted Average Exercise Price |
Non-vested stock options as of January 1, 2020 |  |  | 321,000 |  |  | $ | 3.49 |  |  | $ | 6.55 |
Non-vested stock options as of June 30, 2020 |  |  | 245,000 |  |  | $ | 3.28 |  |  | $ | 6.47 |
Stock options granted during the six-month period ended June 30, 2020 |  |  | 44,000 |  |  | $ | 2.03 |  |  | $ | 4.40 |
Stock options that vested during the six-month period ended June 30, 2020 |  |  | 108,000 |  |  | $ | 3.43 |  |  | $ | 5.98 |
Stock options that were forfeited during the six-month period ended June 30, 2020 |  |  | 12,000 |  |  | $ | 2.91 |  |  | $ | 5.53 |
Schedule of fair value stock option grant using black-scholes option valuation model with the weighted-average assumptions |
|  | During the Three-Month Period Ended June 30, 2020 |  | During the Three-Month Period Ended June 30, 2019 |  | During the Six-Month Period Ended June 30, 2020 |  | During the Six-Month Period Ended June 30, 2019
Risk-free interest rate |  | 0.29% |  | 1.81% |  | 0.54% |  | 2.20%
Dividend yield |  | 0% |  | 0% |  | 0% |  | 0%
Expected volatility |  | 50% |  | 52% |  | 51% |  | 52%
Expected life |  | 4.8 years |  | 6.5 years |  | 5.6 years |  | 5.3 years

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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