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Fair Value of Financial Instruments - Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Notes Warrants    
Balance at beginning of period $ 334 $ 1,575
Change in fair value   (1,021)
Derecognition of debt   (22)
Balance at end of period 362 532
Total    
Balance at beginning of period 597 4,892
Change in fair value (186) (2,984)
Derecognition of debt   (22)
Balance at end of period 411 1,886
Notes Warrants    
Notes Warrants    
Change in fair value 28  
Additional Warrants    
Balance at beginning of period   2,052
Change in fair value   (1,222)
Balance at end of period   830
Additional Warrants    
Additional Warrants    
Balance at beginning of period 263 1,265
Change in fair value (214) (741)
Balance at end of period $ 49 $ 524