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Fair Value Measurement - Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | $ 122,924 | $ 149,680
Mutual and money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 88,568 | 104,672
Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 19,071 | 22,155
Government securities - U.S. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 13,462 | 18,999
Other fixed-income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 1,823 | 3,854
Fair Value Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 88,568 | 104,672
Fair Value Measurements, Recurring | Level 1 | Mutual and money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 88,568 | 104,672
Fair Value Measurements, Recurring | Level 1 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Government securities - U.S. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 0 | 0
Fair Value Measurements, Recurring | Level 1 | Other fixed-income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 0 | 0
Fair Value Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 34,356 | 45,008
Fair Value Measurements, Recurring | Level 2 | Mutual and money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 0 | 0
Fair Value Measurements, Recurring | Level 2 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 19,071 | 22,155
Fair Value Measurements, Recurring | Level 2 | Government securities - U.S. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 13,462 | 18,999
Fair Value Measurements, Recurring | Level 2 | Other fixed-income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 1,823 | 3,854
Fair Value Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Mutual and money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Government securities - U.S. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | 0 | 0
Fair Value Measurements, Recurring | Level 3 | Other fixed-income securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mutual and money market funds | $ 0 | $ 0

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