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CONVERTIBLE NOTES - Bridge Notes (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 26, 2020 | Mar. 25, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of convertible notes |  |  |  |  | $ (1,225,000) |  |  |
Conversion of convertible debt, plus interest, into common stock |  |  |  |  | $ 2,176,000 |  |  |
Convertible notes |  |  |  | $ 0 |  | $ 0 |  |
April 2019 Bridge Notes And May 2019 Bridge Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Guaranteed interest period | 18 months | 12 months |  |  |  |  |  |
Convertible Debt [Member] | Convertible Bridge Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt discount |  |  |  |  |  |  |  | $ 1,796,000
Debt premium on debt |  |  |  |  |  |  | $ 679,000 |
Number of shares converted from debt instrument (in shares) |  |  | 3,480,148 |  | 3,908,145 |  |  |
Conversion of convertible debt, plus interest, into common stock |  |  | $ 1,800,000 |  | $ 2,200,000 |  |  |
Amendment Agreement | Convertible Debt [Member] | April 2019 Bridge Notes And May 2019 Bridge Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of convertible notes |  |  |  | 1,200,000 |  |  |  |
Floor price | $ 0.40 | $ 2.25 |  |  |  |  |  |
Debt premium on debt |  |  |  | $ 800,000 |  |  |  |

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