PREPAID EXPENSES AND OTHER ASSETS - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Prepaid Expense and Other Assets [Abstract]
Prepaid insurance	$ 807	$ 1,205
Prepaid fees and services	2,037	2,299
Agent incentives advances	2,015	1,692
Agent advances receivable, net of allowance	2,194	1,514
Prepaid income taxes	240	747
Tenant allowance	1,621	1,621	$ 3,800
Prepaid expenses and other current assets	1,002	990
Prepaid expenses and other assets	$ 9,916	$ 10,068