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Investment in equity securities, at fair value and long-term investments - Summary of Long-term investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Schedule Of Long Term Investments    
Total $ 34,679 $ 29,442
Black Belt Tx Limited | Convertible loan    
Schedule Of Long Term Investments    
Available-for-sale debt securities 169 83
Black Belt Tx Limited | Equity Securities    
Schedule Of Long Term Investments    
Equity securities without readily determinable fair value 1,385 2,250
Juventas Cell Therapy Ltd. | Equity Securities    
Schedule Of Long Term Investments    
Equity securities without readily determinable fair value 26,370 26,059
Juventas Cell Therapy Ltd. | Put option    
Schedule Of Long Term Investments    
Equity securities without readily determinable fair value 212 210
BioInvent International AB | Warrants    
Schedule Of Long Term Investments    
Securities measured at fair value 996 $ 840
Cleave Therapeutics, Inc | Convertible loan    
Schedule Of Long Term Investments    
Securities measured at fair value $ 5,547