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

SHAREHOLDERS' DEFICIT - Stock-based Compensation Expense (Details)

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SHAREHOLDERS' DEFICIT - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Equity [Abstract]        
Stock-based compensation expense $ 174   $ (300) $ 1,000
Stock-based compensation benefit   $ (10)    
Unrecognized compensation cost $ 254   $ 440  
Unvested stock options (in shares) 790   9,453  
Weighted-average remaining vesting period 2 years 6 months   2 years 8 months 12 days