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CONVERTIBLE NOTES (Details) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) Option shares | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) shares | Mar. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible notes |  |  | $ 1,118 |  | $ 14,050
Convertible preferred stock warrant liability |  |  | $ 161,486 | $ 95,342 |
Proceeds from convertible notes, net |  | $ 14,100 |  |  |
Effect of exchange transaction |  |  |  |  | 7,337
Deemed dividend to preferred stockholders |  |  |  |  | 9,484
Deficit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effect of exchange transaction |  | 7,300 |  |  | 7,337
Series D' |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt |  | $ 29,800 |  |  |
Shares reserved for warrants to purchase shares of preferred stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Warrants issued (in shares) | shares |  | 9,338,642 |  | 4,620,018 |
Convertible preferred stock warrant liability |  | $ 2,000 |  | $ 1,600 |
Convertible debt |  | 2,000 |  |  |
Q4 2020 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unamortized discount |  |  |  | 1,600 |
Convertible promissory notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt |  | 15,400 |  |  |
Effect of exchange transaction |  | 40,400 |  |  |
Convertible promissory notes | January 2020 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible notes |  | $ 14,300 |  |  |
Fixed interest rate, annual |  | 8.00% |  |  |
Extension term |  | 6 months |  |  |
Number of options to extend | Option |  | 4 |  |  |
Debt issuance costs |  | $ 200 |  |  |
Term |  | 6 months |  |  |
Deemed dividend to preferred stockholders |  |  |  |  | $ 9,500
Convertible promissory notes | January 2020 Convertible Notes | Affiliated Entity |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible notes |  | $ 13,700 |  |  |
Convertible promissory notes | Q4 2020 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible notes |  |  |  | 19,000 |
Convertible promissory notes | Q4 2020 Convertible Notes | Affiliated Entity |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible notes |  |  |  | $ 7,900 |
Convertible promissory notes | Q1 2021 Convertible Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible notes | $ 1,100 |  |  |  |
Unamortized discount | $ 1,100 |  |  |  |

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