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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 1,144,379 | $ 318,729
Gross unrealized gains | 104 | 106
Gross unrealized losses | (110) | (21)
Fair value | 1,144,373 | 318,814
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 459,801 | 81,612
Gross unrealized gains |  |
Gross unrealized losses | (7) | (1)
Fair value | 459,794 | 81,611
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 263,433 | 43,040
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 263,433 | 43,040
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 193,092 | 32,538
Gross unrealized gains |  |
Gross unrealized losses | (7) | (1)
Fair value | 193,085 | 32,537
U.S. government and agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,276 | 170
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 3,276 | 170
U.S. Treasury security [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost |  | 5,864
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value |  | 5,864
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 684,578 | 237,117
Gross unrealized gains | 104 | 106
Gross unrealized losses | (103) | (20)
Fair value | 684,579 | 237,203
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 173,929 | 112,648
Gross unrealized gains | 23 | 4
Gross unrealized losses | (6) | (8)
Fair value | 173,946 | 112,644
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 13,629 | 17,360
Gross unrealized gains | 52 | 96
Gross unrealized losses |  |
Fair value | 13,681 | 17,456
U.S. government & agency securities, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 497,020 | 107,109
Gross unrealized gains | 29 | 6
Gross unrealized losses | (97) | (12)
Fair value | 496,952 | 107,103
Short-Term Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 300 | 836
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 300 | 836
Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,000 | 3,500
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | $ 3,000 | $ 3,500

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