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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Furniture, Fixtures and Equipment, net to Reimbursable Expenditures (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Furniture, Fixtures and Equipment, net |  |
Capitalized costs associated with system and website development | $ 300,000 | $ 600,000
Goodwill |  |
Impairment of goodwill | 0 | 0
Debt Issuance Costs |  |
Amortization of debt issuance costs | $ 403,000 | 610,000
Revenue Recognition |  |
Notice period to terminate agreements early due to breach or for convenience | 30 days |
Reimbursable Expenditures |  |
Reimbursable expenditures | $ 1,700,000 | $ 9,600,000
Minimum |  |
Revenue Recognition |  |
Term of provisions | 6 months |
Maximum |  |
Revenue Recognition |  |
Term of provisions | 12 months |
Furniture, fixtures and equipment | Minimum |  |
Furniture, Fixtures and Equipment, net |  |
Estimated useful life of assets | 3 years |
Furniture, fixtures and equipment | Maximum |  |
Furniture, Fixtures and Equipment, net |  |
Estimated useful life of assets | 5 years |
Leasehold improvements | Minimum |  |
Furniture, Fixtures and Equipment, net |  |
Estimated useful life of assets | 3 years |
Leasehold improvements | Maximum |  |
Furniture, Fixtures and Equipment, net |  |
Estimated useful life of assets | 5 years |

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