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Net Income (Loss) Per Share - Calculation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:      
Net income (loss) $ 626,698 $ (26,704) $ (116,846)
Denominator:      
Weighted-average shares outstanding - basic (in shares) 186,466 177,846 171,176
Weighted-average shares outstanding - diluted (in shares) 197,223 177,846 171,176
Net income (loss) per share - basic (in USD per share) $ 3.36 $ (0.15) $ (0.68)
Net income (loss) per share - diluted (in USD per share) $ 3.18 $ (0.15) $ (0.68)
Common stock options      
Denominator:      
Potentially dilutive securities (in shares) 1,109 0 0
Restricted stock units      
Denominator:      
Potentially dilutive securities (in shares) 4,897 0 0
2022 Notes | In-the-money portion of 2022 Notes      
Denominator:      
In-the-money portion of Notes (in shares) 2,737 0 0
2018 Warrants | Warrants      
Denominator:      
Warrants (in shares) 842 0 0
2022 Warrants | Warrants      
Denominator:      
Warrants (in shares) 1,172 0 0