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CONVERTIBLE NOTES - Bridge Notes (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 26, 2020 | Mar. 25, 2020 | Dec. 31, 2020 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of convertible notes |  |  | $ (1,225) |
Convertible notes |  |  | 0 | $ 0
April 2019 Bridge Notes And May 2019 Bridge Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Guaranteed interest period | 18 months | 12 months |  |
April 2019 Bridge Notes And May 2019 Bridge Notes | Convertible Debt [Member] | Amendment Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floor price | $ 0.40 | $ 2.25 |  |
Debt premium on debt |  |  | 800 |
Loss on extinguishment of convertible notes |  |  | 1,200 |
Convertible Bridge Loan | Convertible Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Warrant liability canceled due to settlement of equity instruments |  |  | $ 2,200 |
Number of shares converted from debt instrument (in shares) |  |  | 3,908,145 |

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