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Commitments and contingencies - Future minimum sublease rentals (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2022 $ 1,569
2023 2,756
2024 2,825
2025 2,896
2026 2,968
2027 and thereafter 761
Future minimum sublease rentals $ 13,775