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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 |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Total common stock equivalents (in shares) | 8,344 | 13,363 |  |  |
0.25% Convertible Senior Notes Due 2023 | Senior Notes |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Face value | $ 345,000,000 |  | $ 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 | $ 700,000,000 | $ 800,000,000 | $ 100,000,000 |
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) | 1,050 | 3,258 |  |  |
RSUs and PSUs |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Total common stock equivalents (in shares) | 3,316 | 6,732 |  |  |
Senior Notes |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Total common stock equivalents (in shares) | 3,968 | 3,332 |  |  |
Employee stock purchase plan |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Total common stock equivalents (in shares) | 10 | 41 |  |  |

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