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Government loan (Details) - USD ($)
$ in Thousands
May 11, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]      
Government loan   $ 4,499 $ 4,499
Paycheck Protection Program from U.S. CARES Act [Member]      
Disclosure of detailed information about borrowings [line items]      
Government loan $ 4,500    
Loan term 2 years    
Interest rate 1.00%