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Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | $ 586,348 | $ 955,905
Liabilities | 1,352 | 2,545
Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 1,352 | 2,545
Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 18,746 |
Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 421,904 | 757,571
Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 38,654 | 62,154
Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 123,723 | 117,434
Prepayments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 2,067 |
Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 479,306 | 807,359
Liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 0 | 0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets |  | 0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 418,893 | 751,454
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 0 | 0
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 60,413 | 55,905
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Prepayments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 0 |
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 107,042 | 148,546
Liabilities | 1,352 | 2,545
Significant Other Observable Inputs (Level 2) | Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 1,352 | 2,545
Significant Other Observable Inputs (Level 2) | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets |  | 18,746
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 3,011 | 6,117
Significant Other Observable Inputs (Level 2) | Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 38,654 | 62,154
Significant Other Observable Inputs (Level 2) | Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 63,310 | 61,529
Significant Other Observable Inputs (Level 2) | Prepayments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 2,067 |
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 0 | 0
Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 0 | 0
Significant Unobservable Inputs (Level 3) | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets |  | 0
Significant Unobservable Inputs (Level 3) | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 0 | 0
Significant Unobservable Inputs (Level 3) | Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 0 | $ 0
Significant Unobservable Inputs (Level 3) | Prepayments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | $ 0 |

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