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Net Loss Per Share - Shares Excluded From Computation Of Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Apr. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 12,989 | 10,058 | 8,828 | 11,379 |  |  |  |
0.25% Convertible Senior Notes Due 2023 | Senior Notes |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Face value | $ 173,018,000 |  | $ 173,018,000 |  | $ 345,000,000 |  |  | $ 345,000,000
Conversion price | $ 26.95 |  | $ 26.95 |  |  |  |  |
0.25% Convertible Senior Notes Due 2023 | Senior Notes | Capped Call |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Conversion price | $ 40.68 |  | $ 40.68 |  |  |  |  |
0.125% Convertible Senior Notes Due 2025 | Senior Notes |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Face value | $ 800,000,000 |  | $ 800,000,000 |  | $ 800,000,000 | $ 100,000,000 | $ 700,000,000 |
Conversion price | $ 51.56 |  | $ 51.56 |  |  |  |  |
0.125% Convertible Senior Notes Due 2025 | Senior Notes | Capped Call |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Conversion price | $ 79.32 |  | $ 79.32 |  |  |  |  |
Options to purchase common stock |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 865 | 2,122 | 977 | 2,715 |  |  |  |
RSUs and PSUs |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 3,394 | 3,831 | 3,425 | 4,952 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 8,721 | 4,098 | 4,422 | 3,709 |  |  |  |
Employee stock purchase plan |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 9 | 7 | 4 | 3 |  |  |  |

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