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Equity method investments - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Jul. 24, 2020
Related Party Transaction [Line Items]        
Equity method investments $ 1,588   $ 2,373 $ 4,900
Equity method investment, ownership percentage 49.00%      
Equity method investment, majority ownership percentage 51.00%      
Equity method investment, period majority voting share capital can be sold to the company 2 years 6 months      
Loss on equity method investments $ 785 $ 274    
Oncacare        
Related Party Transaction [Line Items]        
Loan granted to related party     $ 10,000  
Related party, loan interest rate     1.60%