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CONVERTIBLE NOTES - 5.00% Notes (Narrative) (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 18, 2023
$ / shares
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
shares
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 09, 2023
USD ($)
Mar. 15, 2023
Apr. 30, 2018
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]                        
Accrued interest       $ 1,014,000   $ 164,000            
Equity Option                        
Debt Instrument [Line Items]                        
Derivative liability                 $ 38,200,000      
5.00% Convertible Notes Due 2026 | Convertible Notes                        
Debt Instrument [Line Items]                        
Interest rate   5.00% 5.00% 5.00%         5.00%      
Carrying amount       $ 37,655,000   36,102,000            
Shares issued (in shares) 0.13888889   0.13888889                  
Initial conversion price (in usd per share) | $ / shares $ 7.20                      
Conversion premium percent 50.00%                      
Common stock issuable upon conversion (in shares)       9,400,000                
Issuance costs     $ 3,000,000                  
Debt term   3 years 6 months 3 years 6 months                  
Effective interest rate   27.30% 27.30%                  
Percentage of principal amount redeemed   100.00%                    
Gain (loss) on extinguishment of debt       $ 0 $ 0              
Unamortized debt premium       5,129,000   5,408,000     $ 6,000,000      
Accrued interest       1,000,000   100,000            
5.00% Convertible Notes Due 2026 | Convertible Notes | Level 3                        
Debt Instrument [Line Items]                        
Fair value       42,600,000   50,800,000     $ 38,200,000      
5.00% Convertible Notes Due 2026 | Convertible Notes | Minimum                        
Debt Instrument [Line Items]                        
Shares issued (in shares) 0.12048193                      
Initial conversion price (in usd per share) | $ / shares $ 8.30                      
5.00% Convertible Notes Due 2026 | Convertible Notes | Initial Conversion Rate Conversions                        
Debt Instrument [Line Items]                        
Notes exchanged           $ 700,000            
Shares issued, converted (in shares) | shares           94,000            
Gain (loss) on extinguishment of debt           $ 100,000            
Debt Conversion, Converted Instrument, Amount           300,000            
Fair value           400,000            
5.00% Convertible Notes Due 2026 | Convertible Notes | Fixed Conversion Rate Conversions                        
Debt Instrument [Line Items]                        
Notes exchanged       $ 100,000   $ 300,000            
Shares issued, converted (in shares) | shares       11,000   39,000            
5.00% Convertible Notes Due 2026 | Convertible Notes | Fixed Conversion Rate Conversions 2023                        
Debt Instrument [Line Items]                        
Debt Conversion, Converted Instrument, Amount           $ 100,000            
5.00% Convertible Notes Due 2026 | Convertible Notes | Fixed Conversion Rate Conversions 2024                        
Debt Instrument [Line Items]                        
Debt Conversion, Converted Instrument, Amount           100,000            
2.50% Convertible Notes Due 2023 | Convertible Notes                        
Debt Instrument [Line Items]                        
Interest rate       2.50%           2.50%   2.50%
Aggregate principal amount   $ 10,000,000 $ 10,000,000                 $ 150,000,000
Carrying amount   $ 66,900,000 $ 66,900,000 $ 726,000   $ 726,000 $ 56,400,000          
Debt term                     5 years  
Gain (loss) on extinguishment of debt             $ 3,600,000 $ 4,900,000