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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 16, 2021 | Mar. 04, 2021 | Jun. 08, 2020
Accounting policies: |  |  |  |  |  |  |
Payroll support program proceeds | $ (8,405,000) | $ (6,346,000) | $ (14,768,000) | $ (6,346,000) |  |  |
Payroll Support Program Extension, CARES Act |  |  |  |  |  |  |
Accounting policies: |  |  |  |  |  |  |
Debt instrument, face |  |  |  |  |  | $ 5,500,000 | $ 16,400,000
Payroll support program proceeds | 2,900,000 |  | 5,500,000 |  |  |  |
Grant proceeds |  |  | 5,500,000 |  |  |  |
Payroll Support Program, CARES Act |  |  |  |  |  |  |
Accounting policies: |  |  |  |  |  |  |
Payroll support program proceeds | $ 0 |  | $ 3,700,000 |  |  |  |
American Rescue Plan Act of 2021 |  |  |  |  |  |  |
Accounting policies: |  |  |  |  |  |  |
Debt instrument, face |  |  |  |  | $ 5,500,000 |  |

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