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Cash and Cash Equivalents, and Investments - Schedule of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | $ 836,953 |
Fair Value | 837,722 |
Cash and cash equivalents: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 387,520 | $ 374,664
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 387,520 | 374,664
Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 380,686 | 93,449
Unrealized Gain | 470 | 0
Unrealized Loss | (82) | (104)
Fair Value | 381,074 | 93,345
Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 310,102 | 16,059
Unrealized Gain | 539 | 9
Unrealized Loss | (158) | (16)
Fair Value | 310,483 | 16,052
Cash | Cash and cash equivalents: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 241,355 | 351,345
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 241,355 | 351,345
Money market funds | Cash and cash equivalents: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 146,165 | 5,052
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 146,165 | 5,052
Commercial paper | Cash and cash equivalents: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost |  | 18,267
Unrealized Gain |  | 0
Unrealized Loss |  | 0
Fair Value |  | 18,267
Commercial paper | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 7,489 | 40,500
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | (12)
Fair Value | 7,489 | 40,488
Corporate securities | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 318,946 | 38,616
Unrealized Gain | 425 | 0
Unrealized Loss | (78) | (87)
Fair Value | 319,293 | 38,529
Corporate securities | Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 295,103 | 14,429
Unrealized Gain | 533 | 9
Unrealized Loss | (158) | (14)
Fair Value | 295,478 | 14,424
U.S. treasury securities | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 44,251 | 14,333
Unrealized Gain | 39 | 0
Unrealized Loss | (4) | (5)
Fair Value | 44,286 | 14,328
U.S. treasury securities | Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost |  | 1,630
Unrealized Gain |  | 0
Unrealized Loss |  | (2)
Fair Value |  | $ 1,628
Agency Securities | Short-term investments: |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 10,000 |
Unrealized Gain | 6 |
Unrealized Loss | 0 |
Fair Value | 10,006 |
Agency Securities | Long-term investments |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cost | 14,999 |
Unrealized Gain | 6 |
Unrealized Loss | 0 |
Fair Value | $ 15,005 |

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