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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Fair Value Measurements |  |
Short-term investments (money market funds, U.S. Government Securities and Agency Investments) | $ 246,571 |
Recurring | Estimate of fair value measurement |  |
Fair Value Measurements |  |
Total | 382,018 |
Recurring | Money market funds, U.S. Government Securities and Agency Investments | Estimate of fair value measurement |  |
Fair Value Measurements |  |
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments) | 136,771 | $ 261,090
Recurring | U.S. Government Securities and Agency Investments | Estimate of fair value measurement |  |
Fair Value Measurements |  |
Short-term investments (money market funds, U.S. Government Securities and Agency Investments) | 245,247 |
Recurring | Level 1 |  |
Fair Value Measurements |  |
Total | 357,018 |
Recurring | Level 1 | Money market funds, U.S. Government Securities and Agency Investments |  |
Fair Value Measurements |  |
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments) | 111,771 | $ 261,090
Recurring | Level 1 | U.S. Government Securities and Agency Investments |  |
Fair Value Measurements |  |
Short-term investments (money market funds, U.S. Government Securities and Agency Investments) | 245,247 |
Recurring | Level 2 |  |
Fair Value Measurements |  |
Total | 25,000 |
Recurring | Level 2 | Money market funds, U.S. Government Securities and Agency Investments |  |
Fair Value Measurements |  |
Cash equivalents (money market funds, U.S. Government Securities and Agency Investments) | $ 25,000 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. All of the above and Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current. + References No definition available. + Details
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