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Stockholders' Equity (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Stockholders' Equity |
Schedule of Black-Scholes option pricing model to stock options granted | In applying the Black-Scholes option pricing model to stock options granted, the Company used the following approximate assumptions:
|  | For the Year Ended |
|  | December 31, |
|  | 2019 |  | 2018 |
Expected term (years) |  | 5.50 - 10.00 |  | 5.50 - 10.00 |
Risk free interest rate |  | 1.42 - 2.53 | % | 2.69 - 3.24 | %
Expected volatility |  | 134 - 139 | % | 140 -141 | %
Expected dividends |  | 0.00 | % | 0.00 | %
Schedule of the stock option activity | A summary of the option activity during the year ended December 31, 2019 is presented below:
|  |  |  |  |  |  | Weighted |  |  |
|  |  |  | Weighted |  | Average |  |  |
|  |  |  | Average |  | Remaining |  | Aggregate
|  | Number of |  | Exercise |  | Life |  | Intrinsic
|  | Options |  | Price |  | In Years |  | Value
Outstanding January 1, 2019 |  | 2,220,868 |  | $ | 3.01 |  |  |  |  |
Granted |  | 692,572 |  |  | 3.10 |  |  |  |  |
Exercised |  | (668,502) |  |  | 1.42 |  |  |  |  |
Forfeited |  | (7,500) |  |  | 4.73 |  |  |  |  |
Outstanding December 31, 2019 |  | 2,237,438 |  | $ | 3.51 |  | 8.1 |  | $ | 3,559,915
Exercisable December 31, 2019 |  | 1,183,637 |  | $ | 3.33 |  | 7.3 |  | $ | 2,222,680
Schedule of information related to stock options | The following table presents information related to stock options as of December 31, 2019:
Options Outstanding |  | Options Exercisable
|  |  |  | Weighted |  |
|  | Outstanding |  | Average |  | Exercisable
Exercise |  | Number of |  | Remaining Life |  | Number of
Price |  | Options |  | In Years |  | Options
$ 1.24 |  | 260,000 |  | 5.2 |  | 260,000
$ 1.95 |  | 700,281 |  | 7.5 |  | 545,170
$ 2.74 |  | 6,000 |  | — |  | —
$ 3.11 |  | 681,572 |  | — |  | —
$ 4.00 |  | 2,000 |  | 8.9 |  | 723
$ 5.10 |  | 6,000 |  | 8.7 |  | 2,667
$ 5.19 |  | 16,500 |  | 8.7 |  | 6,875
$ 5.25 |  | 26,668 |  | 6.8 |  | 21,249
$ 6.20 |  | 311,499 |  | 8.6 |  | 224,438
$ 6.30 |  | 60,000 |  | 8.5 |  | 28,333
$ 8.72 |  | 166,918 |  | 8.3 |  | 94,182
|  | 2,237,438 |  | 7.3 |  | 1,183,637

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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=116856206&loc=d3e5070-113901 + Details
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