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Commitments and contingencies - Future Minimum Payments under Non-Cancellable Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Operating Leased Assets [Line Items]    
2022 $ 19 $ 28
Bandwidth Purchase Commitments [Member]    
Operating Leased Assets [Line Items]    
2022 $ 4,410