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STOCKHOLDERS' EQUITY (Tables) | 6 Months Ended
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Jun. 30, 2021
STOCKHOLDERS' EQUITY [Abstract] |
Schedule of stockholders' equity, including warrants and rights | The following represents a summary of the warrants outstanding as of June 30, 2021:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Underlying |  | Exercise
​ | ​ | Issue Year | ​ | Expiration | ​ | Shares | ​ | Price
Warrants | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) |  | 2017 |  | June 2022 |  | 2,540 |  | $ | 41.25
(1) | ​ | 2017 | ​ | June 2022 | ​ | 500 | ​ | $ | 7.50
(2) |  | 2017 |  | June 2022 |  | 6,095 |  | $ | 105.00
(3) |  | 2017 |  | August 2022 |  | 25,201 |  | $ | 0.40
(4) |  | 2017 |  | August 2022 |  | 4,000 |  | $ | 46.88
(5) |  | 2017 |  | August 2022 |  | 47,995 |  | $ | 150.00
(5) | ​ | 2017 | ​ | August 2022 | ​ | 9,101 | ​ | $ | 7.50
(6) |  | 2017 |  | August 2022 |  | 16,664 |  | $ | 0.40
(6) | ​ | 2017 | ​ | August 2022 | ​ | 7,335 | ​ | $ | 0.40
(7) |  | 2017 |  | October 2022 |  | 666 |  | $ | 0.40
(8) | ​ | 2018 | ​ | October 2022 | ​ | 7,207 | ​ | $ | 112.50
(9) | ​ | 2018 | ​ | April 2023 | ​ | 69,964 | ​ | $ | 5.40
(9) | ​ | 2018 | ​ | April 2023 | ​ | 78,414 | ​ | $ | 5.40
(10) | ​ | 2018 | ​ | October 2022 | ​ | 15,466 | ​ | $ | 11.25
(11) | ​ | 2018 | ​ | July 2023 | ​ | 14,671 | ​ | $ | 5.40
(11) | ​ | 2018 | ​ | July 2023 | ​ | 14,672 | ​ | $ | 5.40
(11) | ​ | 2018 | ​ | August 2023 | ​ | 20,903 | ​ | $ | 5.40
(11) | ​ | 2018 | ​ | August 2023 | ​ | 20,903 | ​ | $ | 5.40
(11) | ​ | 2018 | ​ | September 2023 | ​ | 19,816 | ​ | $ | 5.40
(11) | ​ | 2018 | ​ | September 2023 | ​ | 20,903 | ​ | $ | 5.40
(12) | ​ | 2018 | ​ | November 2023 | ​ | 75,788 | ​ | $ | 5.40
(12) | ​ | 2018 | ​ | December 2023 | ​ | 51,282 | ​ | $ | 5.40
(13) | ​ | 2019 | ​ | April 2024 | ​ | 147,472 | ​ | $ | 5.40
(14) | ​ | 2019 | ​ | May 2024 | ​ | 154,343 | ​ | $ | 9.56
​ |  |  |  |  |  | 831,901 |  | ​ |
(1) | These warrants were issued in connection with a June 2017 merger transaction (the “Merger”).
(2) | These warrants were issued in connection with the Merger.
(3) | These warrants were issued in connection with an underwritten public offering completed on August 28, 2017 (the “August 2017 Offering”) and are the August 2017 Offering Warrants discussed below.
(4) | These warrants were issued in connection with the August 2017 Offering.
(5) | These warrants were issued in connection with the conversion of our Series A Senior stock, at the time of the closing of the August 2017 Offering.
(6) | These warrants were issued in connection with the conversion of convertible bridge notes, at the time of the closing of the August 2017 Offering, and are the Note Conversion Warrants discussed below.
(7) | These warrants were issued in connection with the waiver of default the Company received in the fourth quarter of 2017 in connection with the Convertible Promissory Notes and are the Convertible Promissory Note Warrants discussed below.
(8) | These warrants were issued in connection with the Debt Obligation settlement agreements and are the Creditor Warrants discussed below.
(9) | These warrants were issued in connection with the 2018 Note Agreement and are the April 2018 Warrants discussed below.
(10) | These warrants were issued in connection with the 2018 Note Agreement and are the Advisor Warrants discussed below.
(11) | These warrants were issued in connection with the 2018 Note Agreement and are the Q3 2018 Warrants discussed below.
(12) | These warrants were issued in connection with the 2018 Note Agreement and subsequent Amendment Agreement and are the Q4 2018 Warrants discussed below.
(13) | These warrants were issued in connection with the 2018 Note Agreement and subsequent Amendment No. 2 Agreement and are the April 2019 Warrants discussed below.
(14) | These warrants were issued in connection with the May 2019 Bridge Notes and are the May 2019 Warrants discussed below.
Summary of dividends recorded | There were no deemed dividends during the three and six months ended June 30, 2021 or the three months ended June 30, 2020. The following represents a summary of the dividends recorded for the six months ended June 30, 2020:
​ | ​ | ​ | ​
​ | ​ | Amount Recorded
Deemed Dividends |  | (in thousands)
​ | ​ | ​ | ​
Dividends resulting from the March 2020 Amendment | ​ | ​ | ​
Deemed Dividend A | ​ | $ | 3,333
Deemed Dividend B | ​ | ​ | 6
Deemed Dividend C | ​ | ​ | 5
Deemed Dividend D | ​ | ​ | *
​ | ​ | ​ | ​
For the six months ended June 30, 2020 | ​ | $ | 3,344
​ | ​ | ​ | ​
* Represents less than one thousand dollars

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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=120381028&loc=d3e5047-113901 Reference 2: 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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