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WARRANTS (Tables) | 12 Months Ended
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Dec. 31, 2021
Warrants and Rights Note Disclosure [Abstract] |
Warrants and Rights Outstanding, Valuation Assumptions | The following assumptions were used to estimate the fair value of the preferred stock warrants as of November 3, 2021 and December 31, 2020:
| November 3, 2021 |  | December 31, 2020
Expected term (in years) | 4.91 |  | 5.75
Fair value of underlying shares | $ | 15.00 |  |  | $ | 5.38 |
Risk-free interest rate | 1.17 | % |  | 0.47 | %
Volatility | 63.0 | % |  | 65.1 | %
Expected dividend yield | — | % |  | — | %
Warrants and Rights Outstanding, Activity | Following is a summary of the terms of the warrants and warrant activity as well as warrants outstanding at December 31, 2021:
Date of issuance | October 2015/ March 2016 |  | October 1, 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 |  | Partially 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, 2019 | 717,225 |  |  | 157,580 |  |  | 306,835 |
Exercised 2020 | — |  |  | — |  |  | — |
Outstanding at December 31, 2020 | 717,225 |  |  | 157,580 |  |  | 306,835 |
Exercised 2021 | 717,225 |  |  | 157,580 |  |  | 276,151 |
Outstanding at December 31, 2021 | — |  |  | — |  |  | 30,684 |
Fair value at December 31, 2021 (in thousands) | $ | — |  |  | $ | — |  |  | $ | 15 |

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