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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of stock warrant activity | A summary of stock warrant activity for the years ended December 31, 2018 and 2017 are presented below:
|  | Number of Warrants (in thousands) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at December 31, 2016 |  |  | 52 |  |  | $ | 0.21 |  |  |  |  |  |  | $ | - |
Granted |  |  | 150 |  |  | $ | 2.42 |  |  |  |  |  |  |  |  |
Exercised |  |  | (2 | ) |  | $ | 0.35 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  | $ | - |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 200 |  |  | $ | 1.86 |  |  |  | 5.86 |  |  | $ | 264 |
Outstanding at December 31, 2017 |  |  | 200 |  |  | $ | 1.86 |  |  |  |  |  |  |  |  |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |  |  |  |
Exercised |  |  | (50 | ) |  | $ | 0.20 |  |  |  |  |  |  |  |  |
Forfeited |  |  | - |  |  | $ | - |  |  |  |  |  |  |  |  |
Outstanding and Exercisable at December 31, 2018 |  |  | 150 |  |  | $ | 2.42 |  |  |  | 5.77 |  |  | $ | 79 |
Warrant [Member] |
Summary of fair value of common stock warrants | The Company uses the Black Scholes option pricing model to determine the fair value of common stock warrants, using the following assumptions during the years ended December 31, 2018 and 2017:
|  | 2018 |  |  | 2017 |
Weighted average expected term |  |  | - |  |  |  | 4.38 years |
Weighted average volatility |  |  | - |  |  |  | 136.62 | %
Weighted average risk-free interest rate |  |  | - |  |  |  | 1.51 | %
Dividend yield |  |  | - |  |  |  | 0 | %

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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=109197908&loc=d3e5070-113901 + Details
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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=109197908&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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 + Details
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