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Critical accounting estimates and assumptions (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Critical accounting estimates and assumptions [Line Items]            
Value of contracted revenue $ 13,000,000          
Cash and cash equivalents $ 530,468 $ 567,298 $ 916,488 $ 501,491 $ 541,644 $ 585,416