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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity Note [Abstract] |
Schedule of warrants outstanding at various exercise prices | The warrants had various exercise prices and terms as follows as of December 31, 2018:
Summary of Warrants |  | Warrants Outstanding |  |  | Exercise Price |  |  | Expiration Date
2015 Financing (a) |  |  | 20,000 |  |  | $ | 6.05 |  |  | July 31, 2020
2015 Financing (b) |  |  | 50,000 |  |  |  | 11.00 |  |  | May 11, 2020
2014 Financing (c) |  |  | 1,749,186 |  |  |  | 5.00 |  |  | December 24, 2019
2014 Financing (c) |  |  | 1,500 |  |  |  | 5.00 |  |  | December 18, 2019
2012 Series B private placement (d) |  |  | — |  |  |  | 25.00 |  |  | October 24, 2018
Total |  |  | 1,820,686 |  |  |  |  |  |  |
| a) | In connection with the offering on July 31, 2015, the placement agent received warrants to purchase 20,000 shares of common stock at $6.05 per share. The warrants are exercisable and expire on July 31, 2020 .
| b) | In connection with the offering on May 11, 2015, the placement agent received warrants to purchase 50,000 shares of common stock at $11.00 per share. The warrants are exercisable and expire on May 11, 2020 .
| c) | In connection with an offering on December 24, 2014, warrants to purchase 3,500,000 shares of common stock at $5.00 per share were purchased and issued for $ 0.01 per warrant. The warrants are exercisable and expire on December 24, 2019 . Also, in connection with the offering on December 24, 2014, the underwriter received warrants to purchase 68,735 shares of common stock at $5.00 per share. The warrants are exercisable and expire on December 18, 2019 .
| d) | In connection with a private placement offering on October 25, 2012, warrants to purchase 400,001 shares of common stock at $25.00 per share were issued. The warrants expired on October 24, 2018 .

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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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