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LONG-TERM DEBT (Department of Economic and Community Development) (Details) - Department of Economic and Community Development (DECD) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 08, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Gross proceeds from grant received and loan | $ 400,000 |  |  |
Proceeds from grant | $ 100,000 |  |  |
Debt instrument, term | 10 years |  |  |
Debt instrument, maturity date | Dec. 31, 2027 |  |  |
Interest rate (as a percent) | 3.25% |  |  |
Term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from long-term debt | $ 300,000 |  |  |
Debt issuance costs, net | $ 31,000 | $ 21,000 |  | $ 22,000
Amortization of debt issuance cost |  | 1,000 |  |
2021 |  | 3,000 |  |
2022 |  | 3,000 |  |
2023 |  | 3,000 |  |
2024 |  | 3,000 |  |
2025 |  | $ 3,000 |  |
Term loan | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Amortization of debt issuance cost |  |  | $ 1,000 |

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