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CONVERTIBLE NOTES - 5.00% Notes (Narrative) (Details)
$ / shares in Units, instrument in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Oct. 18, 2023
$ / shares
Jun. 30, 2023
USD ($)
Aug. 31, 2023
USD ($)
shares
Jun. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
instrument
shares
Sep. 30, 2023
USD ($)
instrument
Dec. 31, 2023
USD ($)
shares
Aug. 31, 2024
Apr. 30, 2024
Jun. 09, 2023
USD ($)
Mar. 15, 2023
Apr. 30, 2018
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]                          
Accrued interest         $ 1,010,000   $ 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% 5.00% 5.00% 5.00%   5.00%      
Shares issued (in shares) 0.13888889     0.13888889                  
Initial conversion price (in usd per share) | $ / shares $ 7.20                        
Conversion premium percent 50.00%                        
Issuance costs       $ 3,000,000                  
Debt term   3 years 6 months   3 years 6 months                  
Effective interest rate   27.60%   27.60%                  
Common stock issuable upon conversion (in shares) | instrument         9.6 9.2              
Percentage of principal amount redeemed   100.00%                      
Gain (loss) on extinguishment of debt           $ 0              
Unamortized debt premium         $ 4,500,000   $ 5,408,000     $ 6,000,000      
Accrued interest         1,000,000.0   100,000            
5.00% Convertible Notes Due 2026 | Convertible Notes | Level 3                          
Debt Instrument [Line Items]                          
Fair value         51,600,000   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            
Aggregate principal converted 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]                          
Aggregate principal converted amount             $ 100,000            
5.00% Convertible Notes Due 2026 | Convertible Notes | Fixed Conversion Rate Conversions 2024                          
Debt Instrument [Line Items]                          
Aggregate principal converted amount             $ 100,000            
2.50% Convertible Notes Due 2023 | Convertible Notes                          
Debt Instrument [Line Items]                          
Interest rate         2.50% 2.50% 2.50%   2.50%   2.50%   2.50%
Aggregate principal amount   $ 10,000,000   $ 10,000,000 $ 700,000               $ 150,000,000
Debt term                       5 years