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Fair Value Measurements - Fair Value of Financial Instruments on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets:    
Total $ 7,029  
Investment in equity securities    
Assets:    
Total 6,950  
Bitcoin    
Assets:    
Total 79  
Warrant    
Liabilities:    
Warrant liabilities 32 $ 205
Fair Value, Inputs, Level 1    
Assets:    
Total 7,029  
Fair Value, Inputs, Level 1 | Investment in equity securities    
Assets:    
Total 6,950  
Fair Value, Inputs, Level 1 | Bitcoin    
Assets:    
Total 79  
Fair Value, Inputs, Level 1 | Warrant    
Liabilities:    
Warrant liabilities 0 0
Fair Value, Inputs, Level 2    
Assets:    
Total 0  
Fair Value, Inputs, Level 2 | Investment in equity securities    
Assets:    
Total 0  
Fair Value, Inputs, Level 2 | Bitcoin    
Assets:    
Total 0  
Fair Value, Inputs, Level 2 | Warrant    
Liabilities:    
Warrant liabilities 0 0
Fair Value, Inputs, Level 3    
Assets:    
Total 0  
Fair Value, Inputs, Level 3 | Investment in equity securities    
Assets:    
Total 0  
Fair Value, Inputs, Level 3 | Bitcoin    
Assets:    
Total 0  
Fair Value, Inputs, Level 3 | Warrant    
Liabilities:    
Warrant liabilities $ 32 $ 205