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Cash and Cash Equivalents, and Investments - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 2,559,025 |
Fair Value | 2,558,937 |
Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 656,169 | $ 479,853
Unrealized Gain | 1 | 0
Unrealized Loss | (2) | 0
Fair Value | 656,168 | 479,853
Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 1,215,230 | 664,119
Unrealized Gain | 1,016 | 1,502
Unrealized Loss | (302) | (54)
Fair Value | 1,215,944 | 665,567
Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 712,025 | 523,270
Unrealized Gain | 122 | 641
Unrealized Loss | (923) | (283)
Fair Value | 711,224 | 523,628
Commercial paper | Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 605,318 | 204,152
Unrealized Gain | 78 | 24
Unrealized Loss | (32) | (6)
Fair Value | 605,364 | 204,170
Corporate debt securities | Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 609,912 | 459,967
Unrealized Gain | 938 | 1,478
Unrealized Loss | (270) | (48)
Fair Value | 610,580 | 461,397
Corporate debt securities | Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 673,029 | 484,275
Unrealized Gain | 118 | 605
Unrealized Loss | (921) | (283)
Fair Value | 672,226 | 484,597
Agency bonds | Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 38,996 | 38,995
Unrealized Gain | 4 | 36
Unrealized Loss | (2) | 0
Fair Value | 38,998 | 39,031
Cash | Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 24,399 | 15,054
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 24,399 | 15,054
Money market funds | Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 532,493 | 464,799
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 532,493 | $ 464,799
Commercial paper | Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 99,277 |
Unrealized Gain | 1 |
Unrealized Loss | (2) |
Fair Value | $ 99,276 |

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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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