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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value of Financial Instruments |  |
Money Market Funds | $ 143,480 | $ 163,544
Marketable Securities | 454,232 |
Equity Securities with Readily Determinable Fair Value | 36,860 | 5,303
Money Market Funds |  |
Fair Value of Financial Instruments |  |
Money Market Funds | 123,892 | 158,937
Corporate Securities |  |
Fair Value of Financial Instruments |  |
Marketable Securities | 144,418 | 119,833
Government Securities |  |
Fair Value of Financial Instruments |  |
Marketable Securities | 309,814 | 315,353
Fair Value, Measurements, Recurring |  |
Fair Value of Financial Instruments |  |
Total Fair Value | 578,124 | 594,123
Fair Value, Measurements, Recurring | Money Market Funds |  |
Fair Value of Financial Instruments |  |
Money Market Funds | 123,892 | 158,937
Fair Value, Measurements, Recurring | Corporate Securities |  |
Fair Value of Financial Instruments |  |
Marketable Securities | 144,418 | 119,833
Fair Value, Measurements, Recurring | Government Securities |  |
Fair Value of Financial Instruments |  |
Marketable Securities | 309,814 | 315,353
Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value of Financial Instruments |  |
Total Fair Value | 123,892 | 158,937
Level 1 | Fair Value, Measurements, Recurring | Money Market Funds |  |
Fair Value of Financial Instruments |  |
Money Market Funds | 123,892 | 158,937
Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value of Financial Instruments |  |
Total Fair Value | 454,232 | 435,186
Level 2 | Fair Value, Measurements, Recurring | Corporate Securities |  |
Fair Value of Financial Instruments |  |
Marketable Securities | 144,418 | 119,833
Level 2 | Fair Value, Measurements, Recurring | Government Securities |  |
Fair Value of Financial Instruments |  |
Marketable Securities | $ 309,814 | $ 315,353

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