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14. Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of fair value of financial assets and liabilities on a recurring basis
    Level 1     Level 2     Level 3  
              (In thousands)          
Assets as of December 31, 2020:                        
Trading securities - equity   $ 109,103     $     $  
Investment at fair value - warrants (Note 6)           2,752        
Total recurring fair value measurements as of December 31, 2020   $ 109,103     $ 2,752     $  
                         
Assets as of December 31, 2019:                        
Trading securities - debt   $     $ 93,843     $  
Trading securities - equity     17,140              
Investment at fair value - warrants (Note 6)           757        
Investment at fair value - common stock (Note 6)     743              
Total recurring fair value measurements as of December 31, 2019   $ 17,883     $ 94,600     $  
                         
Liabilities as of December 31, 2020:                        
Series A warrants   $     $ 6,640     $  
Series B warrants                 52,341  
Embedded derivative liability                 26,728  
Total liabilities as of December 31, 2020   $     $ 6,640     $ 79,069  
                         
Liabilities as of December 31, 2019:                        
Series A warrants   $     $ 3,568     $  
Embedded derivative liability                 17,974  
Total liabilities as of December 31, 2019   $     $ 3,568     $ 17,974  
Summary of changes in finacial liability Level 3
  Series A Preferred Stock Embedded Derivative Liability   Series B Warrants Liability 
   (In thousands)
Opening balance as of January 1, 2019    
Issuance of Series A warrants  $21,232   $  
Remeasurement to fair value   (3,258)    
Balance as of December 31, 2019  $17,974   $ 
           
Issuance of Series B warrants        4,600 
Remeasurement to fair value   8,754    47,741 
Balance as of December 31, 2020  $26,728   $52,341