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STOCK-BASED COMPENSATION - Schedule of Compensation Expense (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-classified and liability-classified stock-based compensation |  |  |  | $ 1,414,000 | $ 1,026,000
2018 Equity Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-classified and liability-classified stock-based compensation |  | $ 821,000 | $ 580,000 | 1,379,000 | 918,000
Liability-classified stock-based compensation converted to equity-classified | $ 313,000 |  |  |  |
2018 Equity Incentive Plan | Liability-Classified Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-classified and liability-classified stock-based compensation |  | $ 35,000 | $ 108,000 | $ 35,000 | $ 108,000

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