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Summary of Significant Accounting Policies - Net Loss Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net loss $ (95,645) $ (117,321) $ (190,266) $ (208,962)
Denominator:        
Weighted average common shares used in calculation of basic net loss per share (in shares) 119,602 109,580 119,267 106,328
Effect of dilutive securities:        
Dilutive securities, convertible debt (in shares) 0 0 0 0
Weighted average common shares outstanding used in calculation of diluted net loss per share (in shares) 119,602 109,580 119,267 106,328
Net loss per share:        
Basic (in dollars per share) $ (0.80) $ (1.07) $ (1.60) $ (1.97)
Diluted (in dollars per share) $ (0.80) $ (1.07) $ (1.60) $ (1.97)
Common stock options        
Effect of dilutive securities:        
Dilutive securities, share-based payment (in shares) 0 0 0 0
Restricted stock and RSUs        
Effect of dilutive securities:        
Dilutive securities, share-based payment (in shares) 0 0 0 0
PSUs        
Effect of dilutive securities:        
Dilutive securities, share-based payment (in shares) 0 0 0 0