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Fair value of financial assets and liabilities - Textual (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Fair value of financial assets and liabilities    
Transfers from level 1 to level 2, Assets $ 0 $ 0
Transfers from level 2 to level 1, Assets 0 0
Transfers from level 1 to level 2, Liabilities 0 0
Transfers from level 2 to level 1, Liabilities 0 0
Transfers into level 3 Assets 0 0
Transfers out of level 3 Assets 0 0
Transfers into level 3 liabilities 0 0
Transfers out of level 3 liabilities $ 0 $ 0