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Loss per common share - Summary of computation of basic and diluted loss per common share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:                
Net loss $ (47,420) $ (42,652) $ (39,383) $ (32,612) $ (51,976) $ (56,849) $ (129,455) $ (141,437)
Denominator:                
Weighted average common shares for basic loss per common share 422,216     272,565     388,111 271,969
Effect of dilutive securities 0     0     0 0
Weighted average common shares for diluted loss per common share 422,216     272,565     388,111 271,969
Loss per common share, basic and diluted $ (0.11)     $ (0.12)     $ (0.33) $ (0.52)