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Available-for-Sale Securities - Information on Securities (Details)
Jan. 28, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Cost   $ 15,000,000  
Interest   833,000  
Unrealized Gains   4,000  
Unrealized Losses   (20,000)  
Impairment   (15,817,000)  
Estimated Fair Value   0  
Principal   57,811,000 $ 565,000
Silk EV Note | Convertible Debenture      
Debt Securities, Available-for-sale [Line Items]      
Principal $ 15,000,000    
Interest rate of convertible note 6.00%    
Conversion ratio (as a percent) 0.80    
Silk EV | Convertible promissory note and interest      
Debt Securities, Available-for-sale [Line Items]      
Cost   15,000,000  
Interest   833,000  
Unrealized Gains   4,000  
Unrealized Losses   (20,000)  
Impairment   (15,817,000)  
Estimated Fair Value $ 15,000,000 $ 0