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Short-term investments - Schedule of Short-Term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Short-term investments $ 115,652 $ 117,821
Time deposits [Member]    
Schedule of Investments [Line Items]    
Short-term investments 62,379 68,828
Investments in financial instruments [Member]    
Schedule of Investments [Line Items]    
Short-term investments $ 53,273 $ 48,993