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Net Loss per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income $ (157,437) $ (140,875)
Denominator:    
Weighted-average number of shares outstanding, basic and diluted (in shares) 728,579 641,047
Net loss per share, basic and diluted (in dollars per share) $ (0.22) $ (0.22)