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Warrants (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Warrants and Rights Note Disclosure [Abstract] |  |
Summary of Assumptions Used to Estimate Fair Value of Warrants Granted | The following table summarizes the assumptions used to estimate the fair value of the warrants granted during the nine months ended September 30, 2019.
|  | 2019 |
Expected dividend yield |  |  | 0 | %
Weighted-average expected volatility |  |  | 217 | %
Weighted-average risk-free interest rate |  |  | 2.75 | %
Expected life of warrants |  |  | 5 years |
| The following table summarizes the assumptions used to estimate the fair value of warrants granted during the years ended December 31, 2018 and 2017:
|  | 2018 |  |  | 2017 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Weighted-average expected volatility |  |  | 231-632 | % |  |  | 200 | %
Weighted-average risk-free interest rate |  |  | 2.55-2.75 | % |  |  | 1.81-1.84 | %
Expected life of warrants |  |  | 5-8 years |  |  |  | 5 years |
Schedule of Outstanding and Exercisable Warrants | The Company’s outstanding and exercisable warrants as of September 30, 2019 are presented below:
|  | Number Outstanding |  |  | Weighted Average Exercise Price |  |  | Contractual Life in Years |  |  | Intrinsic Value |
Warrants Outstanding as of December 31, 2018 |  |  | 2,880,141 |  |  | $ | 0.08 |  |  |  | 3.74 |  |  | $ | 782,385 |
Warrants granted |  |  | 300,000 |  |  | $ | 0.01 |  |  |  | - |  |  |  | - |
Warrants forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Warrants exercised |  |  | (16,666 | ) |  | $ | 0.01 |  |  |  | - |  |  |  | - |
Warrants Outstanding as of September 30, 2019 |  |  | 3,163,475 |  |  | $ | 0.08 |  |  |  | 3.02 |  |  | $ | 3,574,954 |
| The Company’s outstanding and exercisable warrants as of December 31, 2018 and 2017 are presented below:
|  | Number Outstanding |  |  | Weighted Average Exercise Price |  |  | Contractual Life in Years |  |  | Intrinsic Value |
Warrants Outstanding as of December 31, 2016 |  |  | 2,647,446 |  |  | $ | 0.24 |  |  |  | 4.24 |  |  | $ | 930,751 |
Warrants granted |  |  | 115,650 |  |  | $ | 0.18 |  |  |  | 5.0 |  |  |  | - |
Warrants forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Warrants exercised |  |  | (25,000 | ) |  | $ | 0.01 |  |  |  | - |  |  |  | - |
Warrants Outstanding as of December 31, 2017 |  |  | 2,738,096 |  |  | $ | 0.24 |  |  |  | 3.28 |  |  | $ | 937,567 |
Warrants granted |  |  | 577,045 |  |  | $ | 0.02 |  |  |  | 7.11 |  |  |  |  |
Warrants forfeited |  |  | (435,000 | ) |  |  | - |  |  |  | - |  |  |  | - |
Warrants exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Warrants Outstanding as of December 31, 2018 |  |  | 2,880,141 |  |  | $ | 0.08 |  |  |  | 3.74 |  |  | $ | 782,385 |

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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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