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Fair Value Measurements (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Fair Value Measurements |  |
Marketable securities | $ 601,989 | $ 610,185
Total Assets Measured at Fair Value | 860,410 | 825,908
Fair value assets Level1 To Level 2 | 0 |
Fair value assets Level2 To Level 1 | 0 |
Fair value assets transfers into Level3 | 0 |
Fair value assets transfers out of Level3 | 0 |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value Measurements |  |
Marketable securities | 601,989 | 610,185
Cash and cash equivalents | 258,421 | 215,723
Total Assets Measured at Fair Value | 860,410 | 825,908
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Corporate Bond Securities [Member] |  |
Fair Value Measurements |  |
Marketable securities | 54,673 | 117,928
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Commercial Paper [Member] |  |
Fair Value Measurements |  |
Marketable securities | 547,316 | 492,257
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value Measurements |  |
Cash and cash equivalents | 258,421 | 215,723
Total Assets Measured at Fair Value | 258,421 | 215,723
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value Measurements |  |
Marketable securities | 601,989 | 610,185
Total Assets Measured at Fair Value | 601,989 | 610,185
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member] |  |
Fair Value Measurements |  |
Marketable securities | 54,673 | 117,928
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] |  |
Fair Value Measurements |  |
Marketable securities | $ 547,316 | $ 492,257

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