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Related party transactions - Loans to shareholders (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]      
Loans to shareholders $ 10,149,000 $ 123,000 $ 8
Short-term and Long-term loan from shareholders     49
Boris Gertsovsky      
Disclosure of transactions between related parties [line items]      
Loans to shareholders     8
Short-term loan from shareholders     $ 49