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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Furniture, Fixtures and Equipment, net to Reimbursable Expenditures (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Furniture, Fixtures and Equipment, net
Capitalized costs associated with system and website development	$ 1,700,000	$ 1,700,000	$ 800,000
Goodwill
Impairment of goodwill	0	0	0
Debt Issuance Costs
Amortization of debt issuance costs	$ 238,000	340,000	354,000
Revenue Recognition
Notice period to terminate agreements early due to breach or for convenience	30 days
Reimbursable Expenditures
Reimbursable expenditures	$ 1,500,000	$ 800,000	$ 300,000
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	2 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	2 years
Leasehold Improvements | Maximum
Furniture, Fixtures and Equipment, net
Estimated useful life of assets	5 years

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