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Fair Value Measurements - Assets and Liabilities Measured and Carried at Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | $ 1,223,496 | $ 1,371,946 |  |
Contingent consideration | 48,200 | 38,100 |  |
Total liabilities | 48,200 | 38,100 |  |
Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 100,859 | 63,919 |  |
Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 26,866 | 113,362 |  |
Government and Government Agency Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 854,254 | 1,001,137 |  |
Corporate Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 180,781 | 130,380 |  |
Strategic Equity Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 7,606 | 6,527 |  |
Certificates of Deposit [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 53,130 | 56,621 |  |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 107,465 | 69,446 |  |
Contingent consideration | 0 | 0 |  |
Total liabilities | 0 | 0 |  |
Level 1 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 100,859 | 63,919 |  |
Level 1 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 1 [Member] | Government and Government Agency Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 1 [Member] | Corporate Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 1 [Member] | Strategic Equity Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 6,606 | 5,527 |  |
Level 1 [Member] | Certificates of Deposit [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 1,115,031 | 1,301,500 |  |
Contingent consideration | 0 | 0 |  |
Total liabilities | 0 | 0 |  |
Level 2 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 2 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 26,866 | 113,362 |  |
Level 2 [Member] | Government and Government Agency Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 854,254 | 1,001,137 |  |
Level 2 [Member] | Corporate Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 180,781 | 130,380 |  |
Level 2 [Member] | Strategic Equity Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 2 [Member] | Certificates of Deposit [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 53,130 | 56,621 |  |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 1,000 | 1,000 |  |
Contingent consideration | 48,200 | 38,100 |  |
Total liabilities | 48,200 | 38,100 | $ 36,100 | $ 36,900
Level 3 [Member] | Money Market Funds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 3 [Member] | Commercial Paper [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 3 [Member] | Government and Government Agency Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 3 [Member] | Corporate Bonds [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 0 | 0 |  |
Level 3 [Member] | Strategic Equity Investments [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | 1,000 | 1,000 |  |
Level 3 [Member] | Certificates of Deposit [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets | $ 0 | $ 0 |  |

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