General form of registration statement for all companies including face-amount certificate companies

LEASES - Lease Terms and Discount Rates (Details)

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LEASES - Lease Terms and Discount Rates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Leases [Abstract]        
Weighted average remaining lease term: Operating leases (in years) 3 years 7 months 6 days 1 year 1 year 2 years 6 months
Weighted average remaining lease term: Financing leases (in years) 1 year 9 months 18 days 1 year 4 months 24 days   1 year 10 months 24 days
Weighted average discount rate: Operating leases (as a percent) 9.90% 10.00% 9.90% 5.60%
Weighted average discount rate: Financing leases (as a percent) 8.00% 7.60%   9.20%
ROU assets acquired in exchange for operating lease liabilities $ 42      
ROU assets acquired in exchange for finance lease liabilities   $ 79