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Summary of Significant Accounting Policies (Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Total cash and cash equivalents | $ 932,398 | $ 81,611
Total investments | 227,921 | 237,203
Short-term restricted cash: Cash | 836 | 836
Long-term restricted cash: Cash | 3,500 | 3,500
Total assets measured at fair value | 1,164,655 | 323,150
Liabilities |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |
Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 906,453 | 43,040
Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 25,945 | 32,537
U.S. government and agency securities [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 170
U.S. Treasury security [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 5,864
Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 75,465 | 112,644
Corporate debt securities [Member] |  |
Assets |  |
Total investments | 15,548 | 17,456
U.S. government & agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 136,908 | 107,103
Level 1 [Member] |  |
Assets |  |
Total cash and cash equivalents | 906,453 | 43,040
Short-term restricted cash: Cash | 836 | 836
Long-term restricted cash: Cash | 3,500 | 3,500
Total assets measured at fair value | 910,789 | 47,376
Liabilities |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |
Level 1 [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 906,453 | 43,040
Level 2 [Member] |  |
Assets |  |
Total cash and cash equivalents | 25,945 | 38,571
Total investments | 227,921 | 237,203
Total assets measured at fair value | 253,866 | 275,774
Liabilities |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |
Level 2 [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 25,945 | 32,537
Level 2 [Member] | U.S. government and agency securities [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 170
Level 2 [Member] | U.S. Treasury security [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 5,864
Level 2 [Member] | Commercial paper, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 75,465 | 112,644
Level 2 [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 15,548 | 17,456
Level 2 [Member] | U.S. government & agency securities, not included with cash and cash equivalents [Member] |  |
Assets |  |
Total investments | 136,908 | 107,103
Level 3 [Member] |  |
Liabilities |  |
Continuation Advances |  |
Total liabilities measured at fair value |  |

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