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Investments held at fair value - Summary of investments held at fair value (Details) - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
Jan. 08, 2021
Jun. 30, 2020
Feb. 12, 2020
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 13, 2022
Investments held at fair value [Line Items]                
Beginning balance         $ 397,179 $ 553,167    
Realized loss on sale of investments         (29,303) (20,925) $ (54,976)  
Cash purchase of Vor preferred shares         5,000 500 1,150  
Unrealized gain (loss) – change in fair value through profit and loss         (32,060) 179,271    
Balance before allocation of share in associate loss to long-term interest           493,888    
Investment in Sonde Preferred shares – Sonde deconsolidation         11,168      
Cash Investment (Akili)         0 0 10,000  
Ending balance         251,892 397,179 $ 553,167  
Share of associate loss allocated to long-term interest (see Note 6)         (96,700)      
Gelesis                
Investments held at fair value [Line Items]                
Gelesis Earn out shares received in SPAC exchange               $ 14,214
Exchange of Gelesis preferred shares to Gelesis common shares         (92,303)      
Share of associate loss allocated to long-term interest (see Note 6)         0 96,709    
Karuna                
Investments held at fair value [Line Items]                
Sale of Karuna shares           (218,125)    
Realized loss on sale of investments       $ (29,300) (29,303)      
Karuna and Vor                
Investments held at fair value [Line Items]                
Sale of Karuna shares         (118,710)      
Vor                
Investments held at fair value [Line Items]                
Cash purchase of Vor preferred shares $ 500 $ 500 $ 700     $ 500    
Akili                
Investments held at fair value [Line Items]                
Cash Investment (Akili)         5,000      
Gelesis Earn out shares received in SPAC exchange         $ 1,000