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Nature of business and basis of presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]                  
Net loss $ (59,811) $ (52,219) $ (47,258) $ (45,471) $ (40,913) $ (34,693) $ (159,288) $ (121,077)  
Accumulated deficit $ (609,767)           $ (609,767)   $ (450,479)