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Cash and cash equivalents - Summary of cash and cash equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash and cash equivalents [abstract]      
Cash $ 371,057 $ 173,801  
Short-term bank deposits 80,905 3,941  
Cash and cash equivalents $ 451,962 $ 177,742 $ 286,312