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Net loss per share - Numerator and Denominator (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator      
Net loss - Basic $ (523,901) $ (438,160) $ (251,576)
Net loss - Diluted $ (523,901) $ (438,160) $ (251,576)
Denominator      
Basic 70,466,393 66,027,908 58,863,185
Diluted 70,466,393 66,027,908 58,863,185
Net loss per share:      
Basic $ (7.43) $ (6.64) $ (4.27)
Diluted $ (7.43) $ (6.64) $ (4.27)