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Loss per common share - Schedule of calculation of diluted net loss per share allocable to common stockholders (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 49,327 34,826
Stock options [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 18,413 24,590
RSUs [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 16,118 6,030
PSUs [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 9,669 2,423
Warrant [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 5,127 1,783