Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Debt      
Long term debt $ 3,736 $ 3,883  
Long-term debt - current portion (246) (416)  
Long-term debt, net of current portion $ 3,490 $ 3,467  
3.75% Small Business Administration installment loan due May 2050      
Debt      
Interest rate per annum 3.75%    
Director and officer (D&O) insurance policy promissory note 1      
Debt      
Interest rate per annum   6.85% 6.00%
Executive and officer (E&O) insurance policy promissory note      
Debt      
Interest rate per annum   13.50% 9.00%
Notes Payable | 3.75% Small Business Administration installment loan due May 2050      
Debt      
Long term debt $ 115 $ 117  
Notes Payable | Director and officer (D&O) insurance policy promissory note 1      
Debt      
Long term debt 89 179  
Notes Payable | Executive and officer (E&O) insurance policy promissory note      
Debt      
Long term debt 135 215  
Convertible Note Payable      
Debt      
Unamortized costs 104    
Long term debt $ 3,397 $ 3,372