Loss per common share - Schedule of calculation of diluted net loss per share allocable to common stockholders (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	44,569	39,782	28,103
Stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	17,655	23,782	25,030
RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	13,584	7,061	1,240
PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	8,203	2,404
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	6,535	1,833