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Net Income (Loss) Per Share - Shares Excluded From Computation Of Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 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) | 113 | 10,186 | 62 | 11,894 |  |  |  |
0.25% Convertible Senior Notes Due 2023 | Senior Notes |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Face value | $ 344,998,000 |  | $ 344,998,000 |  | $ 345,000,000 |  |  | $ 345,000,000
Conversion price |  |  |  |  |  |  |  | $ 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
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 |  |
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 |  |
Options to purchase common stock |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 0 | 2,753 | 0 | 3,006 |  |  |  |
RSUs and PSUs |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 103 | 3,787 | 52 | 5,394 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 0 | 3,646 | 0 | 3,494 |  |  |  |
Employee stock purchase plan |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Total common stock equivalents (in shares) | 10 | 0 | 10 | 0 |  |  |  |

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