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Net loss per common share - Summary (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net loss (numerator) $ (132,661) $ (545,455) $ (208,100) $ (470,809)
Weighted-average common shares outstanding (denominator):        
Basic (in shares) 12,674 11,667 12,298 11,642
Diluted (in shares) 12,674 11,667 12,298 11,642
Net loss per common share:        
Basic (in USD per share) $ (10.47) $ (46.75) $ (16.92) $ (40.44)
Diluted (in USD per share) $ (10.47) $ (46.75) $ (16.92) $ (40.44)