Cash and cash equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents.
Current accounts		$ 142,787	$ 84,538
Bank deposits		15	19
Total	$ 91,378	$ 142,802	$ 84,557	$ 17,565	$ 3,073

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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