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Available-for-Sale Securities - Information on Securities (Details)
$ in Thousands
Jan. 28, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 01, 2022
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Cost   $ 18,791   $ 15,000  
Interest   902   833  
Unrealized Gains   4   4  
Unrealized Losses   (499)   (20)  
Impairment   (15,886)   (15,817)  
Estimated Fair Value   3,312   0  
Principal   33,598   57,811 $ 565
Silk EV Note | Convertible Debt          
Debt Securities, Available-for-sale [Line Items]          
Principal $ 15,000        
Interest rate 6.00%   6.00%    
Conversion ratio (as a percent) 0.80        
Equity and debt securities          
Debt Securities, Available-for-sale [Line Items]          
Cost   3,791      
Interest   0      
Unrealized Gains   0      
Unrealized Losses   (479)      
Impairment   0      
Estimated Fair Value   3,312      
Silk EV | Convertible promissory note and interest          
Debt Securities, Available-for-sale [Line Items]          
Cost $ 15,000 15,000   15,000  
Interest   902   833  
Unrealized Gains   4   4  
Unrealized Losses   (20)   (20)  
Impairment   (15,886)   (15,817)  
Estimated Fair Value $ 15,000 $ 0   $ 0