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Cash and Cash Equivalents, and Investments - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 1,752,190 |
Fair Value | 1,754,783 |
Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 527,541 | $ 387,520
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 527,541 | 387,520
Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 720,726 | 380,686
Unrealized Gain | 2,682 | 470
Unrealized Loss | (81) | (82)
Fair Value | 723,327 | 381,074
Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 521,269 | 310,102
Unrealized Gain | 627 | 539
Unrealized Loss | (635) | (158)
Fair Value | 521,261 | 310,483
Commercial paper | Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 204,044 | 7,489
Unrealized Gain | 38 | 0
Unrealized Loss | (24) | 0
Fair Value | 204,058 | 7,489
Corporate securities | Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 516,682 | 318,946
Unrealized Gain | 2,644 | 425
Unrealized Loss | (57) | (78)
Fair Value | 519,269 | 319,293
Corporate securities | Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 456,774 | 295,103
Unrealized Gain | 602 | 533
Unrealized Loss | (635) | (158)
Fair Value | 456,741 | 295,478
U.S. treasury securities | Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 44,251
Unrealized Gain |  | 39
Unrealized Loss |  | (4)
Fair Value |  | 44,286
Agency bonds | Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 10,000
Unrealized Gain |  | 6
Unrealized Loss |  | 0
Fair Value |  | 10,006
Agency bonds | Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 64,495 | 14,999
Unrealized Gain | 25 | 6
Unrealized Loss | 0 | 0
Fair Value | 64,520 | 15,005
Cash | Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 17,346 | 241,355
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 17,346 | 241,355
Money market funds | Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 202,522 | 146,165
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 202,522 | $ 146,165
U.S. treasury securities | Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 307,673 |
Unrealized Gain | 0 |
Unrealized Loss | 0 |
Fair Value | $ 307,673 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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