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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable securities: |  |
Fair value, Marketable securities | $ 640,085 | $ 251,756
Municipal bonds [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 3,044 |
Fair Value, Measurements, Recurring [Member] |  |
Cash equivalents and Marketable securities: |  |
Assets, Fair Value | 738,940 | 264,165
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 3,044 |
Fair Value, Measurements, Recurring [Member] | Corporate Notes and Bonds [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 125,604 | 155,740
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 4,999 |
Marketable securities: |  |
Fair value, Marketable securities | 10,995 | 63,506
Fair Value, Measurements, Recurring [Member] | U.S. Agency Obligations [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 54,007 | 32,510
Fair Value, Measurements, Recurring [Member] | U.S. Treasury Securities [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 69,999 |
Marketable securities: |  |
Fair value, Marketable securities | 446,435 |
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 23,857 | 12,409
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Cash equivalents and Marketable securities: |  |
Assets, Fair Value | 23,857 | 12,409
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal bonds [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Notes and Bonds [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial Paper [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 0 |
Marketable securities: |  |
Fair value, Marketable securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Agency Obligations [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury Securities [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 0 |
Marketable securities: |  |
Fair value, Marketable securities | 0 |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Money Market Funds [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 23,857 | 12,409
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Cash equivalents and Marketable securities: |  |
Assets, Fair Value | 715,083 | 251,756
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal bonds [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 3,044 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Notes and Bonds [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 125,604 | 155,740
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Paper [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 4,999 |
Marketable securities: |  |
Fair value, Marketable securities | 10,995 | 63,506
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Agency Obligations [Member] |  |
Marketable securities: |  |
Fair value, Marketable securities | 54,007 | 32,510
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury Securities [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | 69,999 |
Marketable securities: |  |
Fair value, Marketable securities | 446,435 |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Money Market Funds [Member] |  |
Cash equivalents: |  |
Fair value, Cash equivalents | $ 0 | $ 0

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