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Accrued expenses - (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accrued Liabilities, Current [Abstract]    
Accrued consultant fees $ 5,362 $ 5,086
Accrued employee compensation 3,987 6,165
Accrued professional fees 236 288
Accrued other taxes 112 402
Accrued other 119 196
Accrued Liabilities, Total $ 9,816 $ 12,137