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LONG-TERM DEBT (Department of Economic and Community Development) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 08, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Deferred grant revenue |  | $ 100,000 | $ 100,000
Total debt |  | 1,010,000 | 519,000
Revenue, net of contractual allowances and adjustments |  | 7,431,000 | 4,095,000
Department of Economic and Community Development (DECD) |  |  |
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% |  |
Total debt |  | 233,000 | 249,000
Term loan | Department of Economic and Community Development (DECD) |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from long-term debt | $ 300,000 |  |
Debt issuance costs, net | $ 31,000 | 22,000 | 24,000
Amortization of debt issuance cost |  | 2,000 | $ 3,000
2020 |  | 3,000 |
2021 |  | 3,000 |
2022 |  | 3,000 |
2023 |  | 3,000 |
2024 |  | $ 3,000 |

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