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WARRANTS (Tables) | 3 Months Ended
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Mar. 31, 2022
Warrants and Rights Note Disclosure [Abstract] |
Warrants and Rights Outstanding, Activity | The following tables are summaries of the terms of the warrants and warrant activity as well as warrants outstanding at March 31, 2022:
Date of issuance | October 2015/ March 2016 |  | October 2016 |  | July 2018 - Allotment 1 |  | July 2018 - Allotment 2
Number of warrants | 2,103,930 |  |  | 157,580 |  |  | 122,735 |  |  | 184,100 |
Exercise Price | $ | 0.10 |  |  | $ | 0.07 |  |  | $ | 1.28 |  |  | $ | 1.28 |
Status | Vested |  | Vested |  | Vested |  | Vested
Expiration | October 2024 |  | October 2026 |  | July 2028 |  | July 2028
Date of issuance | October 2015/ March 2016 |  | October 2016 |  | July 2018
Outstanding at December 31, 2020 | 717,225 |  |  | 157,580 |  |  | 306,835 |
Exercised during the three months ended March 31, 2021 | — |  |  | — |  |  | — |
Outstanding at March 31, 2021 | 717,225 |  |  | 157,580 |  |  | 306,835 |
Outstanding at December 31, 2021 | — |  |  | — |  |  | 30,684 |
Exercised during the three months ended March 31, 2022 | — |  |  | — |  |  | 25,570 |
Outstanding at March 31, 2022 | — |  |  | — |  |  | 5,114 |
Fair value at March 31, 2022 (in thousands) | $ | — |  |  | $ | — |  |  | $ | 3 |

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