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Nature of the business (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Nature of the business                    
Net losses $ 21,499 $ 21,783 $ 20,095 $ 17,493 $ 15,789 $ 16,189 $ 11,139 $ 9,508 $ 80,870 $ 52,625
Accumulated deficit $ (193,168)       $ (112,298)       $ (193,168) $ (112,298)