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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 1,160,245 | $ 318,729
Gross unrealized gains | 94 | 106
Gross unrealized losses | (20) | (21)
Fair value | 1,160,319 | 318,814
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 932,400 | 81,612
Gross unrealized gains |  |
Gross unrealized losses | (2) | (1)
Fair value | 932,398 | 81,611
Cash and money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 906,453 | 43,040
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 906,453 | 43,040
Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 25,947 | 32,538
Gross unrealized gains |  |
Gross unrealized losses | (2) | (1)
Fair value | 25,945 | 32,537
U.S. government and agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 136,883 | 170
Gross unrealized gains | 29 |
Gross unrealized losses | (4) |
Fair value | 136,908 | 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 | 227,845 | 237,117
Gross unrealized gains | 94 | 106
Gross unrealized losses | (18) | (20)
Fair value | 227,921 | 237,203
Commercial paper, not included with cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 75,470 | 112,648
Gross unrealized gains | 2 | 4
Gross unrealized losses | (7) | (8)
Fair value | 75,465 | 112,644
Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 15,492 | 17,360
Gross unrealized gains | 63 | 96
Gross unrealized losses | (7) |
Fair value | 15,548 | 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 |  | 107,109
Gross unrealized gains |  | 6
Gross unrealized losses |  | (12)
Fair value |  | 107,103
Short-Term Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 836 | 836
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 836 | 836
Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,500 | 3,500
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | $ 3,500 | $ 3,500

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