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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Furniture, Fixtures and Equipment, net to Reimbursable Expenditures (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Furniture, Fixtures and Equipment, net |  |
Capitalized costs associated with system and website development | $ 600,000 | $ 500,000
Goodwill |  |
Impairment of goodwill | 0 | 0
Debt Issuance Costs |  |
Amortization of debt issuance costs | $ 610,000 | 761,000
Revenue Recognition |  |
Notice period to terminate agreements early due to breach or for convenience | 30 days |
Reimbursable Expenditures |  |
Reimbursable expenditures | $ 9,600,000 | $ 9,800,000
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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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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